Momentum Conceptual Questions

A frag grenade is at rest. Then, the grenade explodes into three pieces. The first piece of the grenade has a momentum to the right of 20 kg m/s. The second piece has a momentum of 5 kg m/s to the right. What is the momentum of the third piece, and in what direction does it move?

• I legitimately tried the problem and got an answer that did not match any of these, or I don't understand it.

• To the left 25 kgm/s

• To the right 20 kgm/s

• To the right 5 kgm/s

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NGSS.HS-PS2-2

A wagon is moving to the right. Then, it starts to rain and the wagon fills up with rain. Since there are no outside forces, momentum is conserved. If the mass of the wagon gets two times bigger, how much does its velocity change?

(This is a rule of one's problem. Ask for help if you need it!)

• The new velocity is 1/2 as much

• The new velocity is double (twice as much)

• The new velocity is 1/4 as much

• The new velocity is quadrupled (4 times as much)

• I need help understanding the rules of one's.

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

Lebron James is alone floating in outer space. He has a basketball of course, and he throws the ball away. If the ball moves away at 10 m/s, Lebron will...

• move in the opposite direction at 10 m/s.

• move in the opposite direction at a lower speed.

• move in the opposite direction at a higher speed.

• stay still where he is

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NGSS.HS-PS2-2

A firework is flying up into the air, getting slower and slower until it stops mid-air. Once it stops in the air, it explodes into a ton of pieces. The total momentum after the explosion should be…

• 1. In the up direction, and the pieces should all be moving upwards.

• Should be in the down direction, and the pieces should all be moving downwards.

• The total momentum should be zero, and it is not possible since the pieces are moving

• The total momentum should be zero, and the pieces must move in a bunch of directions to cancel each other out.

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NGSS.HS-PS2-2

(rule of one’s problem) A car is driving down the highway with some momentum. Then, it hits the gas and triples its velocity. What happens to its momentum?

• It doubles

• It triples

• It gets cut in half

• It gets cut in 1/3

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NGSS.HS-PS2-2

Two blocks are attached by a spring in the middle. They are pushed together and held there with a momentum of 0. Then, we let go and the blocks explode apart. If block 1 has a momentum of 12kgm/s, what has to be the momentum of block 2 after the explosion?

• 12 kgm/s

• -12 kgm/s

• 0 kgm/s

• -0 kgm/s

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NGSS.HS-PS2-2

Two bumper cars have the same mass and speed, and they are driving right at each other. After they collide, what should their new total momentum be?

• Twice of what it was before

• 0

• Half of what it was before

• You need to know the numbers to do this problem

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NGSS.HS-PS2-2

Name the Collision: Mr. Wister and Mr. Vause are doing a physics demonstration of Newton's 3rd law by sitting in rolly chairs. Wister in the chair has a mass of 105 kg and Vause has a mass of 80. After Vause kicks Wister's chair he has a velocity of -7 m/s. How fast was Mr. Wister moving after the kick?

• Elastic Collison

• Inelastic Collison

• Explosion

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NGSS.HS-PS2-2

Name the Collision: A bowling ball with a mass of 6kg is rolling with a velocity of 8 m/s. If the .75kg pin is sent flying with a velocity of 18 m/s, what is the new velocity of the bowling ball?

• Elastic Collison

• Inelastic Collison

• Explosion

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NGSS.HS-PS2-2

Name the Collision: Jason Borune attempts to jump onto a moving train. Jason has a mass of 90 kg and a velocity of 6 m/s jumps onto the 5000 kg train with a velocity of -32 m/s. What is the final velocity of the train after Jason Borune lands on it?

• Elastic Collison

• Inelastic Collison

• Explosion

Tags

NGSS.HS-PS2-2