Momentum review

Which of the following is the best example of Newton's Third Law?

• A rocket taking off from earth pushes gasses in one direction and the gasses push the rocket in the other direction.

• A rocket sitting on the ground preparing for takeoff but it needs an outside force to overcome its inertia of a nonmoving object.

• A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large.

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NGSS.MS-PS2-1

If you hit a nail with a hammer which one has the least acceleration?

• Nail

• Hammer

• They have the same.

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NGSS.HS-PS2-1

When an insect hits the windshield of your car as you drive down the highway, which exerts a greater force on the other?

• Insect

• Windshield

• Neither, they have the same.

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NGSS.MS-PS2-1

Two people attempt a tug of war on frictionless ice. One person has six times the mass of the other. Relative to the acceleration of the heavier person, what will be the acceleration of the lighter person?

• 1/6

• The same

• They won't accelerate.

• 6 times

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NGSS.HS-PS2-1

How much force does a man who weighs 550N exert on the floor he is sitting on? How much force does the floor exert on him?

• 550N, 0N

• 550N, 550N

• 0N, 550N

• 0N, 0N

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NGSS.HS-PS2-1

A 20 kg fire cracker is sitting at rest when it explodes. What is momentum of the firecracker fragments after the firecracker explodes?

• 0

• Cannot determine them.

• 200 Ns

• 50 Ns

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NGSS.HS-PS2-2

In physics terms, how does the padding on the dashboard of a car reduce injuries?

• It decreases the amount of time for the collision.

• It increases the force acting on the person.

• It increases the amount of time for the collision.

• It doesn't help.

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NGSS.HS-PS2-3

What happens to momentum if a net force changes the acceleration and velocity of an object?

• It stays the same.

• The momentum of that object is conserved.

• The acceleration doesn't effect the momentum.

• There is an impulse on the object.

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NGSS.HS-PS2-2

Which has more momentum, a large 50,000kg truck moving at 30 miles per hour or a small 20,000kg truck moving at 80 miles per hour?

• The large truck

• The small truck.

• They have the same.

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NGSS.HS-PS2-2

Compared to a sports car moving at 30 km/h, the same sports car moving at 60 km/h has how much momentum?

• The same

• 1/2 as much

• double as much

• triple as much

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NGSS.HS-PS2-2