How Things Move

Everything in the universe is always in motion or at rest. Forces (pushes and pulls) cause changes in motion.

Newton’s Three Laws of Motion

• First Law (Inertia): Objects stay at rest or move at a constant speed unless acted on by a force.
• Second Law (F=ma): Force equals mass times acceleration. The heavier something is, the harder it is to move!
• Third Law (Action-Reaction): For every action, there is an equal and opposite reaction.

Everyday Importance

Newton’s laws explain why seatbelts are important, how rockets launch, and why you move backward when you jump off a skateboard.

Formula

The formula for the second law is \( F = m \times a \).

Fun Fact

Astronauts use Newton’s laws to move around in space!