Unit 6 Momentum Honors

Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?

• Va > Vc

• Va = Vc

• Va < Vc

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?

• The left end

• The right end

• It doesn't move because the two other pieces have equal momenta

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NGSS.HS-PS2-2

The two particles are both moving to the right. Particle 1 catches up with particle 2 and collides with it. The particles stick together and continue on with velocity vf. Which of these statements is true?

• vf is greater than v1.

• vf = v1

• vf is less than v2

• vf = v2

• vf is greater than v2 and less than v1

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NGSS.HS-PS2-2

Impulse is

• 1. a force that is applied at a random time.

• 2. a force that is applied very suddenly.

• 3. the area under the force curve in a force-versus-time graph.

• 4. the time interval that a force lasts.

In an inelastic collision,

• Momentum and Mechanical Energy are conserved

• Only momentum is conserved

• Only mechanical energy is conserved

• Nothing is conserved

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NGSS.HS-PS2-2

Which of the following is a unit of momentum?

• N*s

• N*m

• Kg*m/s²

• J

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NGSS.HS-PS2-2

The engine of a rocket produces an average force of 150 N. Exhaust is emitted behind the rocket at 300 m/s for a total of 20 seconds. How much mass was emitted as exhaust?

• 0.5 kg

• 2 kg

• 2.5 kg

• 10 kg

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NGSS.HS-PS2-1

Which of the following statements is/are true regarding collisions?

I - Momentum is conserved during all collisions involving isolated systems

II - Energy is only conserved during perfectly elastic collisions

III - Energy is only conserved during perfectly inelastic collisions

• I only

• II only

• III only

• I and II only

• I and III only

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NGSS.HS-PS2-2

NGSS.HS-PS3-1

A 2 kg box traveling at 12 m/s collides with a stationary 6 kg cart. If the two carts stick together after the collision, what is their final velocity?

• 1 m/s

• 2 m/s

• 3 m/s

• 4 m/s

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NGSS.HS-PS2-2

A 100 kg football linebacker moving at 2.0 m/s away from the goal line tackles head-on an 80-kg halfback running 3.0 m/s towards the goal line. The collision is inelastic. Neglecting the effects due to digging in of cleats and hitting low/high, who will win the collision?

• The players will tie -- and stop in place

• The 100 kg player will drive the 80 kg player backwards

• The 80 kg player will drive the 100 kg player backwards

• They will rebound so that the 100 kg player moves at 3m/s and the 80 kg player moves at 2 m/s, so the 80 kg player wins.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2