Linear momentum

A 20 kg bike accelerates at 10 m/s². What was the force?

• 25 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

An object with a mass of 5.0 kg accelerates 8.0 m/s² when an unknown force is applied to it. What is the amount of the force?

• 40 N
• 4 N
• 10 N
• 0.1 N

A 1,000 kg truck moving at 10 m/s runs into a concrete wall. It takes 0.5 seconds for the truck to completely stop. What is the magnitude of force exerted on the truck during the collision?

• 1,000 N

• 5,000 N

• 10,000 N

• 20,000 N

Calculate the net force of the object in the image shown.

• 20N
• 35N
• 5N
• 25N

What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

An object and rest will stay at rest and an object in motion will stay in motion unless acted on by a force, is which one of Newton's Laws of Motion?

• 4th Law of Motion
• 1st Law of Motion
• 3rd Law of Motion
• 2nd Law of Motion

What is an elastic collision?

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies is different.

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

• An inelastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

What is an inelastic collision?

• When two objects collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

• When two objects collide, becoming stuck together and internal kinetic energy is lost

• When two objects don't collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

Do both objects have velocities acting in the same direction?

• No

• Yes

• No idea

An Elephant is running at a velocity of 14 m/s. He has a mass of 6,300 kg. What is the elephants momentum? Do not write units.