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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. What does speed tell you?

    • How long a journey lasts
    • How heavy something is
    • How far something travels in a certain time
    • How far away something is

  2. Which of these is a unit of speed?

    • Newtons (N)
    • Metres per second (m/s)
    • Metres (m)
    • Seconds (s)

  3. A girl runs 100 m in 20 s. What is her average speed?

    • 20 m/s
    • 120 m/s
    • 2000 m/s
    • 5 m/s

  4. A car travels 120 km in 2 hours. What is its average speed?

    • 60 km/h
    • 122 km/h
    • 60 m/s
    • 240 km/h

  5. A cyclist rides at a steady 6 m/s for 10 s. How far does she travel?

    • 0.6 m
    • 16 m
    • 6 m
    • 60 m

  6. On a distance-time graph, what does a flat, level line show?

    • The object is not moving
    • The object is moving slowly at a steady speed
    • The object is speeding up
    • The object is slowing down

  7. Two cyclists, P and Q, ride along the same road. Which statement is true?01020304050600246810Time in sDistance in mPQ

    • Q travels further than P in 10 s
    • They ride at the same speed
    • Q is faster than P
    • P is faster than Q

  8. A line on a distance-time graph curves upwards and gets steeper. What is the object doing?

    • Moving at a steady speed
    • Standing still
    • Speeding up
    • Slowing down

  9. A car travels at 30 m/s. It overtakes a lorry that travels the same way at 25 m/s. What is the speed of the car relative to the lorry?

    • 25 m/s
    • 5 m/s
    • 55 m/s
    • 30 m/s

  10. Two trains travel towards each other. One moves at 20 m/s and the other at 30 m/s. What is their relative speed?

    • 50 m/s
    • 20 m/s
    • 10 m/s
    • 30 m/s
Answers
  1. How far something travels in a certain time. Speed links distance and time, such as the metres travelled each second.
  2. Metres per second (m/s). A unit of speed is a distance unit per time unit.
  3. 5 m/s. Speed = distance ÷ time = 100 m ÷ 20 s = 5 m/s.
  4. 60 km/h. 120 km ÷ 2 h = 60 km/h. Kilometres and hours give km/h.
  5. 60 m. She covers 6 m every second, so in 10 s she covers 6 × 10 = 60 m.
  6. The object is not moving. Time passes but the distance does not change, so the object is stationary.
  7. P is faster than Q. Line P is steeper. P covers 50 m in 10 s, and Q covers only 20 m.
  8. Speeding up. A steeper and steeper line means a bigger and bigger speed. The object is accelerating.
  9. 5 m/s. They move in the same direction, so subtract: 30 − 25 = 5 m/s.
  10. 50 m/s. They move in opposite directions, so add: 20 + 30 = 50 m/s.