Study Guide

Study Guide

About Newton's Laws of Motion

Multiple Choice

What is Newton's 1st Law of Motion?

• Every action has an equal and opposite reaction.

• The larger the mass of an object, the more force is needed to accelerate it.

• An object at rest will stay at rest unless it is acted on by an outside force. An object in motion will stay in motion unless it is acted on by an outside force.

Multiple Choice

What is Newton's 2nd Law of Motion?

• Every action has an equal and opposite reaction.

• The larger the mass of an object, the more force is needed to accelerate it.

• An object at rest will stay at rest unless it is acted on by an outside force. An object in motion will stay in motion unless it is acted on by an outside force.

Multiple Choice

What is Newton's 3rd Law of Motion?

• Every action has an equal and opposite reaction.

• The larger the mass of an object, the more force is needed to accelerate it.

• An object at rest will stay at rest unless it is acted on by an outside force. An object in motion will stay in motion unless it is acted on by an outside force.

Example of Newton's 1st Law of Motion

The soccer ball has no motion, it is at rest. The foot is an outside force that is about to act onto the ball. Once the foot hits it, the ball will have motion.

Multiple Choice

Newton's 1st Law: What causes a car to have motion?

• The car itself

• The person starting the car

Example of Newton's 2nd Law of Motion

Two friends are walking together, but one of them has a lower weight than the other. Even though they both walk with the same amount of force, the friend who weighs less will go faster because their acceleration is greater.

Multiple Choice

Newton's 2nd Law: Which animal would have the higher acceleration if they both used the same amount of force?

• An elephant that's still growing

• A full sized elephant

Example of Newton's 3rd Law of Motion

When you swim, you push backwarrds on the water with a force of 200N, that is the action. Because of this, the water pushes you forward with a force of 200N, this is the reaction.

Multiple Choice

Newton's 3rd Law: When you walk you push down on the ground with a force of 50N. How much force will the ground push upwards onto you?

• 5N

• 100N

• 15N

• 50N

Friction

Friction is a force that slows down the motion of objects. It happens when two surfaces slide or try to slide across each other. One thing friction depends on is the amount of force pressing the object into the surface.

Free Body Diagram

It is used to simplify what's going on and better analyze the forces acting on an object.