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1. Which of Newton’s laws of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and the same direction unless acted upon by an unbalanced force?

A. Newton's Third Law of Motion
B. Newton's Second Law of Motion
C. Newton's First Law of Motion
D. Newton's Fourth Law of Motion

2. Which is always true in a closed system?
A. Velocity is constant.
B. Mass is not conserved.
C. Momentum is conserved.
D. Acceleration is not constant.

3. Which is not an example of an external force acting on an object?
A. a batter hitting a baseball
B. a billard ball bouncing off the rail of a pool table
C. a meteor traveling unhindered through space
D. a hockey puck striking the back of the net and coming to rest

4. Which phrase best defines momentum?
A. the change in velocity of an object over time
B. the amount of matter in an object
C. the distance traveled by and object over time
D. the motion of an object

5. Which is an example of an object with a momentum of zero?
A. an empty canoe sitting on the bank of a river
B. a puck sliding across the top of an air hockey table
C. a swimmer diving off the starting block
D. a car rolling down a hill

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12 answers
  1. 1. First law !
    2. again
    3. clue " unhindered "
    4. That same old first law again. Conservation of momentum.
    5. Which is not moving?

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    Damon
  2. Damon, what do you mean again for number 2?

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  3. Damon you are borderline useless.

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  4. Physics U4 L4 Conservation of Momentum

    1. A, Newton’s first law of motion

    2. B, Momentum is conserved.

    3. B, inertia

    4. B, the motion of an object

    5. C, an empty canoe sitting unmoving on the bank of a river

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  5. Søft Angel is 100% right

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  6. Thank you søft angel I got 100%

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  7. søft angel is 100% right just be sure to read because on mine the answers weren’t in the same order!!

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  8. real answers for momentum quick check november 2021

    1. 3 kg • m/s
    2. it has a change in momentum equal to that of the rock, in the opposite direction
    3. newton’s first law of motion
    4. momentum is conserved

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  9. damon you might be the most useless person i've seen

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  10. real is 100% correct.

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  11. real 100%

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  12. Stop being ruse to damon.
    He's a tutor not a answer-giver. It's not his fault that you guys only want answers and don't wanna learn. i use jiskha too, and ppl are always being rude to the tutors. go read a book, or go on youtube and learn how. Saying a tutor is useless when your just sitting around here looking for answers. The useless one would be YOU

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