Newton's Laws - Middle School Physical Science

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Question

What is the "Law of Inertia?"

Answer

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

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Question

A soccer ball is kicked across a grassy lawn with a force of 100 Newtons. The ball keeps rolling for awhile, but is slowed by the friction of the grass as it rolls. This is an example of which of Newton's Laws?

Answer

The answer is Newton's 1st law because the friction of the grass is an unbalanced force which changes the motion of the ball.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

If a car that has a mass of 50 kg is accelerating at a rate of 2 meters per second2, what is the force required to push the car forward?

Answer

The answer is 100 Newtons of force because using Newton's 2nd law, we can multiply mass x acceleration to get the force.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 8.49.03 am

Based on the image, what is the force applied to this object?

Answer

The answer is "10 Newtons" because according to Newton's second law, force = mass x acceleration.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Which of these is the best example of Newton's third law?

Answer

The answer is "a fireman turns on a hose and is knocked backwards" because the force of the water going out of the hose is equal and opposite to the force pushing backwards on the fireman.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.13.07 am

What is the best explanation for why the wall starts to crumble using one of Newton's laws?

Answer

The answer is "According to Newton's 3rd law, forces come in pairs. The wall crumbles because it wasn't strong enough to apply an equal amount of force back on the man pushing it."

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.12.49 am

This image shows an ice skater pushing off another one. They both slide backwards on the ice. This best represents which of Newton's laws?

Answer

The answer is Newton's 3rd Law, because the skaters move away from each other with equal and opposite forces.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Hyiii 50 male full

Crash test dummies are used to test the safety of cars. When cars hit an object, crash test dummies often keep moving and can even go through the car windshield. This is an example of which of Newton's laws?

Answer

This is an example of Newton's 1st law, because the crash dummies have a tendency to remain in motion until a force acts on them.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Which of these is NOT an example of Newton's 2nd law?

Answer

The answer is: "sitting in a chair and the chair exerts the same amount of force as you when you sit on it" because this is an example of Newton's 3rd law.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.42.23 am

According to Newton's laws, which of the answer choices might increase the acceleration of the object?

Answer

The answer is "all of these" because each of the answer choices applies one of newton's laws to make the object slide for longer.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

What is the "Law of Inertia?"

Answer

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

A soccer ball is kicked across a grassy lawn with a force of 100 Newtons. The ball keeps rolling for awhile, but is slowed by the friction of the grass as it rolls. This is an example of which of Newton's Laws?

Answer

The answer is Newton's 1st law because the friction of the grass is an unbalanced force which changes the motion of the ball.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

If a car that has a mass of 50 kg is accelerating at a rate of 2 meters per second2, what is the force required to push the car forward?

Answer

The answer is 100 Newtons of force because using Newton's 2nd law, we can multiply mass x acceleration to get the force.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 8.49.03 am

Based on the image, what is the force applied to this object?

Answer

The answer is "10 Newtons" because according to Newton's second law, force = mass x acceleration.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Which of these is the best example of Newton's third law?

Answer

The answer is "a fireman turns on a hose and is knocked backwards" because the force of the water going out of the hose is equal and opposite to the force pushing backwards on the fireman.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.13.07 am

What is the best explanation for why the wall starts to crumble using one of Newton's laws?

Answer

The answer is "According to Newton's 3rd law, forces come in pairs. The wall crumbles because it wasn't strong enough to apply an equal amount of force back on the man pushing it."

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.12.49 am

This image shows an ice skater pushing off another one. They both slide backwards on the ice. This best represents which of Newton's laws?

Answer

The answer is Newton's 3rd Law, because the skaters move away from each other with equal and opposite forces.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Hyiii 50 male full

Crash test dummies are used to test the safety of cars. When cars hit an object, crash test dummies often keep moving and can even go through the car windshield. This is an example of which of Newton's laws?

Answer

This is an example of Newton's 1st law, because the crash dummies have a tendency to remain in motion until a force acts on them.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Which of these is NOT an example of Newton's 2nd law?

Answer

The answer is: "sitting in a chair and the chair exerts the same amount of force as you when you sit on it" because this is an example of Newton's 3rd law.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

Question

Screen shot 2020 05 27 at 10.42.23 am

According to Newton's laws, which of the answer choices might increase the acceleration of the object?

Answer

The answer is "all of these" because each of the answer choices applies one of newton's laws to make the object slide for longer.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Compare your answer with the correct one above

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