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9th grade forces and motion

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS2-1, NGSS.SEP 4, NGSS.HS-ETS1-2 · England: KS4 Combined Science: Forces and motion, GCSE Combined Science: Forces (velocity–time graphs), GCSE Combined Science: Forces (stopping distance)

Name

Date

Score/ 16

  1. Question 1

    What resultant force is needed to accelerate a 1200 kg mass at 2.5 m/s²?

    AnswerN

  2. Question 2

    A velocity–time graph for a cyclist goes (0 s, 0 m/s) → A (4 s, 4 m/s) → B (9 s, 4 m/s) → C (14 s, 0 m/s). What is the acceleration from the start to A, in m/s²?

    xy24681012141624680(0, 0)ABC

    Answerm/s²

  3. Question 3

    A resultant force of 1600 N acts on a 800 kg object. What is its acceleration, in m/s²?

    Answerm/s²

  4. Question 4

    Velocity–time graph: (0, 0) → A (4, 12) → B (14, 12) → C (24, 0). What is the object doing between the start to A?

    xy61218246120(0, 0)ABC
    • A. speeding up
    • B. moving at a constant velocity
    • C. slowing down
    • D. stationary

  5. Question 5

    A 4 kg cart is pushed forward with 12 N. Friction acts backwards with 4 N. What is its acceleration, in m/s²?

    Answerm/s²

  6. Question 6

    A car's thinking distance is 18 m and its braking distance is 14 m. What is the overall stopping distance, in m?

    Answerm

  7. Question 7

    A car speeds up from 5 m/s to 9 m/s in 4 s. What is its acceleration, in m/s²?

    Answerm/s²

  8. Question 8

    Which part of the stopping distance is increased mainly by this: a driver distracted by a phone?

    • A. thinking distance
    • B. braking distance

  9. Question 9

    A cyclist travelling at 20 m/s brakes and stops in 2 s. What is the acceleration, in m/s²? (A slowing down gives a negative value.)

    Answerm/s²

  10. Question 10

    An object starts at 0 m/s and accelerates at 4 m/s² for 4 s. What is its final velocity, in m/s?

    Answerm/s

  11. Question 11

    A driver travelling at 13 m/s has a reaction time of 1 s. What is the thinking distance, in m?

    Answerm

  12. Question 12

    Velocity–time graph: (0 s, 0 m/s) → A (5 s, 15 m/s) → B (10 s, 15 m/s) → C (20 s, 0 m/s). What is the acceleration from B to C, in m/s²? (Give a negative value for slowing down; 2 decimal places if needed.)

    xy61218612180(0, 0)ABC

    Answerm/s²

  13. Question 13

    What resultant force is needed to accelerate a 1000 kg mass at 2.5 m/s²?

    AnswerN

  14. Question 14

    A velocity–time graph for a cyclist goes (0 s, 0 m/s) → A (10 s, 10 m/s) → B (15 s, 10 m/s) → C (20 s, 0 m/s). What is the acceleration from the start to A, in m/s²?

    xy612186120(0, 0)ABC

    Answerm/s²

  15. Question 15

    A resultant force of 250 N acts on a 50 kg object. What is its acceleration, in m/s²?

    Answerm/s²

  16. Question 16

    Velocity–time graph: (0, 0) → A (10, 20) → B (15, 20) → C (19, 0). What is the object doing between B to C?

    xy6121861218240(0, 0)ABC
    • A. speeding up
    • B. moving at a constant velocity
    • C. slowing down
    • D. stationary

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Answer key: 9th grade forces and motion

  1. 1. 3000 N

  2. 2. 1 m/s²

  3. 3. 2 m/s²

  4. 4. A. speeding up

  5. 5. 2 m/s²

  6. 6. 32 m

  7. 7. 1 m/s²

  8. 8. A. thinking distance

  9. 9. -10 m/s²

  10. 10. 16 m/s

  11. 11. 13 m

  12. 12. -1.5 m/s²

  13. 13. 2500 N

  14. 14. 1 m/s²

  15. 15. 5 m/s²

  16. 16. C. slowing down