Physics Chapter 7: Momentum and Impulse

A lump if putty and a rubber ball have equal mass. Both are thrown with equal speed against a wall. The putty sticks to the wall. The ball bounces back at nearly the same speed with which it hit the wall. Which object experiences the greater momentum change?

• not enough information is given to determine the answer

• the putty experiences the greater momentum change

• the ball experiences the greater momentum change

• the both experiences the same momentum change

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NGSS.HS-PS2-2

In a lab environment, you are investigating the impluse of a force exterted on a brick when the bricks speed is reduced from 2.5 m/s to a complete stop. First, you allow the brick to slam into a secured piece o wood, bringing the brick to a sudden stop. Second, you allow the brick to plow into a large slab of gelatin so that the brick comes to a gradual halt. In which situation is there a greater impulse of the force on the brick?

• there is a greater impulse of the force on the brick from the wall

• not enough info is given to determine the answer

• the impulse is the same in both situations

• there is greater impulse of the force on the brick from the gelatin

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NGSS.HS-PS2-2

NGSS.HS-PS2-1

When person steps forward out of a small boat onto a dock, the boat recoils backward in the water. Why does this occur?

• the momentum of the boat is greater than the momentum of the person

• the total mechanical energy of the system is consverved

• the total momentum of the system is conserved

• the energy of the person is greater than the energy of the boat

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NGSS.HS-PS2-2

A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the two balls after the elastic collison?

• the red ball stops immediately, and the yellow ball has a velocity of +1 m/s

• the velocity of the red ball is -2.0 m/s; the velocity of the yellow ball is +3.0 m/s

• the velocity of the red ball is +2.0 m/s; the velocity of thre yellow ball is -3.0 m/s

• the yellow ball stops immediately, and the red ball has a velocity of -1 m/s

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NGSS.HS-PS2-2

Which of the following statements are true? Select all correct responses.

• the vector sum of forces acting on a particle equals the rate of change of momentum of the particle with respect to time

• the total momentum of any number of particles is equal to the algebraic sum of the momenta of the individual particles

• the total momentum of any number of particles is equal to the vector sum of the momenta of the individual particles

• the total momentum of an isolated system is constant

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NGSS.HS-PS2-2

For an INELASTIC collision, which of the following statements is true?

Choose all that apply.

• momentum is gained or lost

• kinetic energy is gained or lost

• kinetic energy is conserved

• momentum is conserved

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NGSS.HS-PS2-2

For an elastic collision, which of the following statements are true?

Choose all that apply.

• kinetic energy is gained

• momentum is gained

• kinetic energy is conserved

• momentum is conserved

• momentum is lost

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NGSS.HS-PS2-2

What is the momentum of a 5.2-kg salmon swimming upstream with a speed of 2.3 m/s?

• p=12 kg(m)/s

• p=14kg(m)/s

• p=12kg(s)/m

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NGSS.HS-PS2-2

Soccer player 1 has a mass of 47 kg and moves to the right with a speed of 1.1 m/s. Soccer player 2 has a mass of 38 kg. The total momentum of the two players is 2.2 kg(m/s) to the right.

What is the direction of motion of player 2?

• to the left

• to the right

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NGSS.HS-PS2-2

Soccer player 1 has a mass of 47 kg and moves to the right with a speed of 1.1 m/s. Soccer player 2 has a mass of 38 kg. The total momentum of the two players is 2.2 kg(m/s) to the right.

What is the speed of motion of player 2?

(express your answer to 2 significant figures and include the units)

• v2=1.3 s/m

• v2=13 m/s

• v2=1.3 m/s

• v2=31 m/s

Tags

NGSS.HS-PS2-2