Period 9 Momentum Test Practice

20 Questions | Total Attempts: 31

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Period 9 Momentum Test Practice

Questions and Answers
  • 1. 
    When objects collide, some momentum is lost
    • A. 

      True

    • B. 

      False

  • 2. 
    Elastic collision is
    • A. 

      Objects that collide and stick together

    • B. 

      Objects that collide and bounce off of each other

    • C. 

      Objects that collide and decrease their velocity

  • 3. 
    A truck with a mass of 1500 kg is traveling east on a road, going 20 m/s. It has a head on collision with a car (mass=1000) going 20 m/s west. Afterward, the two automobiles are stuck together. What is their velocity? 
    • A. 

      4 m/s

    • B. 

      8 m/s

    • C. 

      12.5 m/s

    • D. 

      20 m/s

  • 4. 
    A cannon fires a 40.5kg shell toward a target and the shell moves with a velocity of 120m/s.  Calculate the shell's momentum.
    • A. 

      4,860 kg x m/s

    • B. 

      4.86 kg x m/s

    • C. 

      2.45 kg x m/s

    • D. 

      10 kg x m/s

    • E. 

      2,500 kg x m/s

  • 5. 
    Choose all the possible units for momentum. 
    • A. 

      Kg m

    • B. 

      N kg

    • C. 

      Kg m/s

    • D. 

      N s

  • 6. 
    A male and female ice skater are practicing together. The male has a mass of 60 kg and is moving 6 m/s on the ice when he accidentally has a head on collision with female skater (who has a mass of 50 kg). They are both brought to a sudden stop. What was her original velocity? 
    • A. 

      -10.5 m/s

    • B. 

      10.5 m/s

    • C. 

      7.2 m/s

    • D. 

      -7.2 m/s

  • 7. 
    Is momentum a vector?
    • A. 

      Yes, its direction matters.

    • B. 

      No, its direction matters

    • C. 

      Yes, its direction doesn't matter

    • D. 

      No, its direction doesn't matter

  • 8. 
    Choose ALL that apply!!! Impulse is equal to...
    • A. 

      Force/time

    • B. 

      Force x time

    • C. 

      Momentum

    • D. 

      The change in momentum

  • 9. 
    A bumper car (mass=150 kg) heads toward a wall going 7 m/s. What is its momentum?
    • A. 

      21.4 kg m/s

    • B. 

      1050 kg m/s

    • C. 

      350 kg m/s

    • D. 

      220 kg m/s

  • 10. 
    A bumper car (mass=150 kg) heads toward a wall going 7 m/s. When it hits the wall, a force of -75 N is applied to it for 0.5 s. What is the impulse on the bumper car?
    • A. 

      -37.5 N s

    • B. 

      -350 N s

    • C. 

      -150 N s

    • D. 

      220 N s

  • 11. 
    A bumper car (mass=150 kg) heads toward a wall going 7 m/s. When it hits the wall, a force of -75 N is applied to it for 0.5 s. What is the change in momentum on the bumper car?
    • A. 

      -37.5 N s

    • B. 

      -350 N s

    • C. 

      -150 N s

    • D. 

      220 N s

  • 12. 
    A bumper car (mass=150 kg) heads toward a wall going 7 m/s. When it hits the wall, a force of -75 N is applied to it for 0.5 s. What is the new velocity of the car?
    • A. 

      0 m/s

    • B. 

      -3.4 m/s

    • C. 

      -15 m/s

    • D. 

      -6.7 m/s

  • 13. 
    Two tug boats have the same mass (20,000 kg). The Jolly Roger is driving too fast (11 m/s) when it runs into the Happy Mermaid, which is only going 8 m/s. Afterward the Jolly Roger is moving backward going 9 m/s. How fast is the Happy Mermaid going?
    • A. 

      15.6 m/s

    • B. 

      0 m/s

    • C. 

      11 m/s

    • D. 

      12 m/s

  • 14. 
    Two aliens are playing on hovercrafts. The big blue one has a mass of 30 kg (including her hovercraft). The little pink one has a mass of 20 kg (including his hovercraft). Originally at rest, they push off one another. The velocity of the blue alien is now 6.7 m/s. What is the velocity of the pink alien?
    • A. 

      10.5 m/s

    • B. 

      -10.5 m/s

    • C. 

      +6.7 m/s

    • D. 

      -6.7 m/s

  • 15. 
    Engineers try to design cars that will allow people to survive high velocity impacts. To do this, the try to...
    • A. 

      Increase the change in momentum, causing a decrease in the force of impact.

    • B. 

      Decrease the impulse on the people, by altering the force and time acting on them.

    • C. 

      Increase the time it takes for the people to come to a stop, hence decreasing the force.

    • D. 

      Decrease the change in momentum the people would feel in the collision.

  • 16. 
    In a closed and isolated system, the sum of all the individual ______________ remains constant.
    • A. 

      Momentum

    • B. 

      Velocities

    • C. 

      Acceleration

    • D. 

      Powers

  • 17. 
    A big goat and a little goat are in an epic battle. The big goat has a mass of 25 kg and a velocity of 6 m/s. The smaller goat (mass=20 kg) is rushing right toward him. Smash! They bang heads, coming to a complete stop. What was the original velocity of the little goat?
    • A. 

      -6 m/s

    • B. 

      6 m/s

    • C. 

      -7.5 m/s

    • D. 

      7.6 m/s

  • 18. 
    A big goat and a little goat are in an epic battle. The big goat has a mass of 25 kg and a velocity of 6 m/s. The smaller goat (mass=20 kg) is rushing right toward him. Smash! They bang heads, coming to a complete stop. What was the change in momentum of the big goat?
    • A. 

      -150 kg m/s

    • B. 

      150 kg m/s

    • C. 

      -300 kg m/s

    • D. 

      300 kg m/s

  • 19. 
    A big goat and a little goat are in an epic battle. The big goat has a mass of 25 kg and a velocity of 6 m/s. The smaller goat (mass=20 kg) is rushing right toward him. Smash! They bang heads, coming to a complete stop. What was the impulse on the big goat?
    • A. 

      -150 kg m/s

    • B. 

      150 kg m/s

    • C. 

      -300 kg m/s

    • D. 

      300 kg m/s

  • 20. 
    A big goat and a little goat are in an epic battle. The big goat has a mass of 25 kg and a velocity of 6 m/s. The smaller goat (mass=20 kg) is rushing right toward him. Smash! They bang heads, coming to a complete stop.The goats come to a stop in 0.5 seconds. What was the force on the big goat's head?
    • A. 

      -150 N

    • B. 

      -300 N

    • C. 

      -5 N

    • D. 

      -75.6 N

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