Weekly Review Due 3/7

What does Newton's First Law tell us about objects that are not moving?

• They will disappear.

• They will change direction by themselves.

• They will stay still unless something moves them.

• They will start moving on their own.

How does Newton's Second Law explain the effort needed to pedal a heavy bicycle?

• Heavier bicycles move faster with less force.

• Heavier bicycles need less force to move.

• The force needed is unrelated to the bicycle's weight.

• More force is needed to move heavier bicycles.

What happens when you push harder on the bicycle pedals?

• The bicycle slows down.

• The bicycle moves sideways.

• The bicycle stops.

• The bicycle speeds up.

A 10 kg cart is pushed with a force of 50 N across a smooth floor.

What is the acceleration of the cart?

Force = Mass × Acceleration
(F = m × a)

• 2 m/s²

• 5 m/s²

• 10 m/s²

• 50 m/s²

According to Newton's Third Law, what happens when a ball hits the floor?

• The floor absorbs the ball.

• The ball stays on the floor.

• The ball rolls away.

• The floor pushes the ball back up.

Why does a bicycle move forward when you pedal?

• The ground pulls the bicycle backward.

• The ground pushes the wheels forward.

• The wheels push the ground forward.

• The bicycle moves by itself.