AP Physics 1 - Newton's First Law

1

A passenger in an elevator has a mass that exerts a force of 100N downwards. He experiences a normal force upwards from the elevator's floor of 120N. What direction is he accelerating in, if at all, and at what rate?

$g=10\frac{m}{s^2}$

2

Suppose that two people skydive out of a plane. Person A is , while person B is . After both people open their parachutes, they begin to slow down until they both reach a constant velocity. How does the net force between persons A and B differ?

3

A box is sliding down a plane that has a inclination angle of $\theta = 10^{\circ}$ . Calculate the coefficient of kinetic friction $\mu _k$ if the box is moving at a constant velocity .

4

A 1675 kilogram car is moving to the right at a constant velocity of $25\frac{m}{s}$ .

What is the net force exerted on the car?

5

A spaceship travels in the vacuum of space at a constant speed of $500\frac{m}{s}$ .

Ignoring any gravitational forces, what is the net force on the spaceship?

6

What net force is required to keep a 500 kg object moving with a constant velocity of $10 :\frac{m}{s}$ ?

7

All of the following statements are true. Which of them is NOT explained by Newton's first law of motion?

8

You are sitting in a car, at rest, when another car rear ends your vehicle. Why do you and the passengers experience a whiplash, in terms of Newton's laws of motion?

9

A skydiver of mass has reached terminal velocity at $52 \frac{m}{s}$ . Estimate the force of wind resistance she is experiencing.

10

If an object is being accelerated, what must be true about the forces acting on it?

Newton's First Law

Practice Questions