9-3: 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 does it mean when we say forces act in pairs?

Back

It means that when one object exerts a force on another, the second object exerts a force of equal magnitude and opposite direction on the first object.

Front

If a person is sitting in a chair, what forces are acting on them?

Back

Gravity pulls them down, and the chair exerts an equal and opposite force upward.

Front

What happens to the forces when a book rests on a table?

Back

The book exerts a downward force on the table, and the table exerts an equal upward force on the book.

Front

Can you exert a force on an object without it exerting a force back on you?

Back

No, according to Newton's Third Law, every force has a reaction force.

Front

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

Back

When you jump off a small boat, you push the boat backward as you move forward.

Front

If a bowling ball strikes a pin, which experiences a greater force?

Back

Both experience the same force, but the pin has a greater acceleration due to its smaller mass.

Front

What is the relationship between mass and acceleration in Newton's Second Law?

Back

Acceleration is inversely proportional to mass when the same force is applied.

Front

What is the formula for calculating force?

Back

Force = mass × acceleration (F = ma).

Front

What is an action-reaction pair?

Back

An action-reaction pair consists of two forces that are equal in size, but opposite in direction, acting on two different objects.