Newton's Third Law of Motion

What is the main idea behind Newton's third law of motion?

• Forces always come in pairs.

• Forces act alone.

• Forces are only in rockets.

• Forces are invisible.

How does a water jet pack work according to Newton's third law?

• It pulls water up.

• It pushes air down.

• It blasts water down, and water pushes back up.

• It uses wind to fly.

Why do you move forward when you walk?

• Because your foot pushes the ground, and the ground pushes back.

• Because the ground pulls you.

• Because you push the air.

• Because you pull the air.

What happens when you push on a wall?

• You move backward.

• Nothing happens.

• The wall moves.

• The wall pushes back with the same force.

Why don't action and reaction forces cancel each other out?

• They are too weak.

• They are invisible.

• They are on the same object.

• They are on different objects.