Momentum Practice - AP Physics 1

In which one of the following situations is linear

momentum not conserved?

• A bomb suspended by a string explodes into one hundred fragments.

• A bowling ball collides with a set of ten pins.

• An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction.

• A tree limb is struck by lightning and falls to the ground.

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NGSS.HS-PS2-2

Two objects constitute an isolated system. In an elastic

collision between the two objects, which one of the

following statements is a false statement?

• The total kinetic energy is conserved.

• The kinetic energy of each object is the same before and after the collision.

• The total momentum is conserved.

• The magnitude of the force exerted by each object on the other object is equal.

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NGSS.HS-PS2-2

Car One is traveling due north and Car Two is traveling due east. After the collision shown, Car One rebounds in the due south direction. Which of the numbered arrows is the only one that can represent the final direction of Car Two?

• 1

• 2

• 3

• 4

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NGSS.HS-PS2-2

NGSS.HS-PS2-1

A soccer ball approaches a kicker’s foot at 3 m/s. The foot is in contact with the ball for .02 s and afterwards the ball

travels in the opposite direction at 5 m/s. Find the magnitude of the force the foot exerts on the ball.

• 100

• 200

• 400

• 800

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NGSS.HS-PS2-1

A ball of mass 5 kg falls vertically, hits the floor with a speed 2 m/s and rebounds with a speed of 1 m/s. What is the magnitude of the impulse

exerted on the ball by the floor?

• 5

• 10

• 15

• 2.5

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NGSS.HS-PS2-2

A 12 kg box sliding on a horizontal has an initial

speed of 4.0 m/s. The coefficient of friction between

the box and the floor is 0.20. The box moves a

distance of 4.0 m in 2.0 s. What is the magnitude

of the change in momentum of the box in this time?

• 12

• 24

• 48

• 96

Tags

NGSS.HS-PS2-1

F=ma. Is this true?

• Yes

• No

• ¯\_(ツ)_/¯

• All of the above.

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NGSS.HS-PS2-1

As shown in the figure above, a child of mass M

who is running at a speed of v jumps onto a

stationary sled of equal mass M on a frozen lake.

What percent of the initial kinetic energy is lost?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-PS2-2

Block A of mass 2.0 kg is released from rest at the

top of a 6.0 m long plane inclined at an angle of 30o,

as shown in the figure above. After sliding on the

horizontal surface, block A hits and sticks to block B,

which is at rest and has mass 4.0 kg. Assume there

is no friction.

• 3.2 m/s

• 2.2 m/s

• 1.8 m/s

• 2.6 m/s

Tags

NGSS.HS-PS2-2

NGSS.HS-PS2-1

A 1.0 kg lump of clay is sliding to the right on a frictionless

surface with speed 2 m/s. It collides head-on and sticks to

0.5 kg metal sphere that is sliding to the left with speed 4

m/s. What is the kinetic energy of the combined objects

after the collision?

• 6 J

• 4 J

• 0 J

• 2 J

Tags

NGSS.HS-PS2-2