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11th grade forces and motion

11th grade (Year 12 in England) Ā· 16 questions Ā· Common Core: NGSS.HS-PS2-1, NGSS.HS-PS2-2, NGSS.HS-PS2-3, NGSS.HS-ETS1-2 Ā· England: GCSE Combined Science: Forces (equations of motion), GCSE Combined Science: Forces (conservation of momentum, Higher), GCSE Combined Science: Forces (Physics only: changes in momentum)

Name

Date

Score/ 16

  1. Question 1

    A car travelling at 30 m/s brakes with a deceleration of 7.5 m/sĀ². What is its braking distance, in m? (Give 1 decimal place.)

    Answerm

  2. Question 2

    An object starts at 0 m/s and accelerates uniformly at 1 m/sĀ² over 20 m. What is its final velocity, in m/s? (Give 1 decimal place.)

    Answerm/s

  3. Question 3

    A train speeds up from 10 m/s to 20 m/s over 100 m. What is its acceleration, in m/sĀ²? (Give 2 decimal places.)

    Answerm/sĀ²

  4. Question 4

    A 2 kg toy cannon at rest fires a 0.02 kg ball forwards at 400 m/s. What is the recoil speed of the cannon, in m/s?

    Answerm/s

  5. Question 5

    Why do cyclists' helmets contain crushable foam?

    • A. Foam is heavier than plastic
    • B. Foam reduces air resistance
    • C. Foam makes the helmet bounce
    • D. Crushing foam increases the time the head takes to stop

  6. Question 6

    A 1000 kg car moving at 2 m/s hits a stationary 2000 kg car. They lock together. What is their velocity just after the collision, in m/s? (Give 2 decimal places.)

    Answerm/s

  7. Question 7

    Two ice skaters at rest push apart. Skater A (40 kg) moves off at 3 m/s. What is the total momentum of the two skaters afterwards?

    • A. 120 kg m/s
    • B. 240 kg m/s
    • C. 0 kg m/s
    • D. 40 kg m/s

  8. Question 8

    A helmet increases the time for a head to stop in a fall from 0.05 s to 0.25 s. The change in momentum is the same. By what factor is the average force reduced?

    Answer

  9. Question 9

    A 70 kg passenger moving at 10 m/s is brought to rest in 0.5 s by a seat belt and airbag. What is the average force on the passenger, in N?

    AnswerN

  10. Question 10

    A car travelling at 20 m/s brakes with a deceleration of 10 m/sĀ². What is its braking distance, in m? (Give 1 decimal place.)

    Answerm

  11. Question 11

    An object starts at 2 m/s and accelerates uniformly at 4 m/sĀ² over 10 m. What is its final velocity, in m/s? (Give 1 decimal place.)

    Answerm/s

  12. Question 12

    A train speeds up from 0 m/s to 10 m/s over 25 m. What is its acceleration, in m/sĀ²? (Give 2 decimal places.)

    Answerm/sĀ²

  13. Question 13

    A 5 kg toy cannon at rest fires a 0.05 kg ball forwards at 500 m/s. What is the recoil speed of the cannon, in m/s?

    Answerm/s

  14. Question 14

    How do crumple zones in a car reduce injuries?

    • A. They reduce the change in momentum to zero
    • B. They stop the car instantly
    • C. They increase the time taken to stop, so the force on passengers is smaller
    • D. They make the car heavier

  15. Question 15

    A 1 kg trolley moving at 10 m/s hits a stationary 4 kg trolley. They stick together. What is their velocity just after the collision, in m/s? (Give 2 decimal places.)

    Answerm/s

  16. Question 16

    Two ice skaters at rest push apart. Skater A (40 kg) moves off at 3 m/s. What is the total momentum of the two skaters afterwards?

    • A. 40 kg m/s
    • B. 120 kg m/s
    • C. 240 kg m/s
    • D. 0 kg m/s

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Answer key: 11th grade forces and motion

  1. 1. 60 m

  2. 2. 6.3 m/s

  3. 3. 1.5 m/sĀ²

  4. 4. 4 m/s

  5. 5. D. Crushing foam increases the time the head takes to stop

  6. 6. 0.67 m/s

  7. 7. C. 0 kg m/s

  8. 8. 5

  9. 9. 1400 N

  10. 10. 20 m

  11. 11. 9.2 m/s

  12. 12. 2 m/sĀ²

  13. 13. 5 m/s

  14. 14. C. They increase the time taken to stop, so the force on passengers is smaller

  15. 15. 2 m/s

  16. 16. D. 0 kg m/s