2-2 Collisions Standard Quiz

In all collisions, both elastic and inelastic, momentum must be conserved?

• True

• Flase

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NGSS.HS-PS2-2

Automobile manufacturers, such as Nissan and Toyota, incorporate safety features into their vehicles. Crumple zones in the engine compartment and air bags are two examples of safety technology designed to protect driver and passengers involved in a collision.

How do these design features impact the formula above and the force of impact?

• They decrease the force of impact by providing a cushion during the impact. Smaller force = lower momentum.

• They decrease the force of impact by extending the time it takes to stop the driver and passenger. Longer time = less force.

• It takes a longer time for the velocity of the vehicle to decrease, therefore the force is less. Decrease in velocity = less force.

• When a car rebounds it undergoes a greater change in velocity and the force is decreased. Lower force = greater change in velocity.

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

NGSS.HS-PS2-3

The game is on the line and it's your job to pick one football player to give the ball to run for the winning touchdown. You do not want the opposing team to stop him, therefore, you want the one with the largest momentum.

Which player would you pick?

• Lineman

• Halfback

• Tight End

• Fullback

Tags

NGSS.HS-PS2-2

In a trial, an expert witness uses the conservation of momentum to demonstrate which initial velocities would give the final states that occurred in the accident.

Can using the conservation of momentum be justified in this case?

• Yes, because momentum is conserved in all collisions.

• No, momentum is only conserved in elastic collisions which this is not.

• Yes, because momentum is conserved in inelastic collisions which all car accidents are.

• No, energy is always conserved, but momentum is only sometimes conserved.

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NGSS.HS-PS2-2

This table shows the exchange of momentum for Ball 1, which was traveling at 10 kg m/s when it hit Ball 2, which was stationary.

The momentum of Ball 1 after the collision is

• 4 kg m/s

• 6 kg m/s

• 10 kg m/s

• 14 kg m/s

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NGSS.HS-PS2-2

Two cars are involved in a head-on collision in an alley. The driver of a car with mass, ma = 1,200 kg claims to have been traveling west at via = 7 m/s. The driver of the other car with mass, mb = 1,000 kg claims to have been traveling east at vib = 10 m/s.  The investigating officer found that both cars were stuck together and traveled with a common final velocity after the collision.

Which direction would they be moving after the collision?

• West

• East

• North

• No direction/Not moving

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NGSS.HS-PS2-2

Which factors below will increase the momentum of a rolling ball of constant mass m?  (Select only the answers that will increase the momentum of the ball.)

• Colliding with a ball of much lower mass moving in the opposite direction of the ball.

• Moving from a flat surface to moving downhill.

• Rolling uphill onto an inclined surface.

• A moving object traveling in the same direction as the ball colliding with it. 

• Rolling onto a surface with high amounts of friction with the ball.

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NGSS.HS-PS2-2