3.7 Newton's Third Law

Front

What is Newton's Third Law of Motion?

Back

For every action, there is an equal and opposite reaction.

Front

What unit do we measure force in?

Back

Newtons (N)

Front

What does an action-reaction pair mean?

Back

It means that for every force exerted, there is a force of equal size but opposite direction.

Front

Can action-reaction pairs cause a change in motion?

Back

Yes, they can cause a change in motion.

Front

Why can you feel things that you touch?

Back

Because of Newton's Third Law; when you touch something, it exerts a force back on you.

Front

If you push against a wall, what happens according to Newton's Third Law?

Back

The wall pushes back with an equal and opposite force.

Front

What happens when a small car pushes a big truck?

Back

The truck exerts the same size force onto the car but in the opposite direction.

Front

Is it true that the force exerted by the floor when you walk is equal to the force your foot exerts on the floor?

Back

Yes, it is true.

Front

What is an example of Newton's Third Law in everyday life?

Back

When you jump off a small boat, the boat moves backward.

Front

What is the relationship between mass and force in Newton's Third Law?

Back

Mass does not affect the size of the forces in action-reaction pairs; they are always equal.