Forces and Motion Concepts

What happens when you throw a ball against a wall?

• The ball sticks to the wall.

• The wall pushes the ball back with the same force.

• The ball goes through the wall.

• The ball disappears.

What is Newton's Third Law of Motion about?

• Objects at rest stay at rest.

• Force equals mass times acceleration.

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

• Gravity pulls objects down.

When you sit on a chair, what happens?

• The chair breaks

• Your body exerts a downward force on the chair and the chair exerts an upward force on your body.These forces balanced each other out.

• The chair moves backward .

• The chair moves foward .

Which of these is an example of a contact force?

• Gravity

• Magnetism

• Friction

• Electric force

Which of these is an example of a non-contact force?

• Pushing a car.

• Kicking a ball.

• Friction.

• Gravity.

When a bird flaps its wings, what is the action force?

• The bird flying forward.

• The air pushing the bird upward.

• The wings pushing air downward.

• Gravity pulling the bird down.

What is the reaction force that helps a bird fly?

• The bird's weight.

• The air pushing the bird upward.

• The bird's speed.

• The bird's feathers.

When you jump off a small boat onto the shore, what happens to the boat?

• It stays still.

• It moves forward with you.

• It drifts backward.

• It sinks.

Why does a huge ship barely move when a person jumps off it, compared to a small boat?

• The ship is anchored.

• The ship is made of stronger material.

• The ship's mass is much bigger than the person's.

• The person jumps very slowly.