Science 8 · Unit 3: Forces and energy · Cambridge Lower Secondary Science Stage 8

Questions

1. 1. What is the standard scientific unit of distance?

   • the metre
   • the mile
   • the hour
   • the foot
   Check

2. 2. What is the standard scientific unit of time?

   • the hour
   • the minute
   • the second
   • the day
   Check

3. 3. What is the standard unit of speed?

   • m/s
   • ms
   • m/s²
   • m²s
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4. 4. What does 60 km/h mean?

   • It travels 60 km every hour.
   • It travels 60 m every hour.
   • It travels 60 m every second.
   • It travels 60 km every second.
   Check

5. 5. What is the equation for speed?

   • speed = time ÷ distance
   • speed = distance ÷ time
   • speed = force ÷ area
   • speed = distance × time
   Check

6. 6. A car travels 70 m in 2 s. What is its average speed?

   • 68 m/s
   • 140 m/s
   • 35 m/s
   • 72 m/s
   Check

7. 7. The car then travels 30 m in 2 s. What is its new speed?

   • 32 m/s
   • 28 m/s
   • 15 m/s
   • 60 m/s
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8. 8. Arun walks 450 m in 300 s. What is his average speed?

   • 750 m/s
   • 150 m/s
   • 1.5 m/s
   • 0.67 m/s
   Check

9. 9. Why is Arun's speed an average speed?

   • His speed changes during the walk.
   • Speed can't be measured.
   • He doesn't move.
   • He walks at exactly the same speed.
   Check

10. 10. A plane travels 5400 km in 6 hours. What is its average speed?

    • 900 km/h
    • 90 km/h
    • 32 400 km/h
    • 5406 km/h
    Check

11. 11. What is the equation for distance?

    • distance = force × area
    • distance = time ÷ speed
    • distance = speed × time
    • distance = speed ÷ time
    Check

12. 12. A train travels at 45 m/s. How far does it go in 30 s?

    • 135 m
    • 1.5 m
    • 75 m
    • 1350 m
    Check

13. 13. A train travels at 45 m/s. How far does it go in 2 minutes?

    • 90 m
    • 2700 m
    • 540 m
    • 5400 m
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14. 14. Zara runs at 4 m/s. How long does she take to run 120 m?

    • 124 s
    • 3 s
    • 480 s
    • 30 s
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15. 15. Zara runs at 4 m/s and Sofia cycles at 6 m/s. How much further does Sofia go in one minute?

    • 2 m
    • 60 m
    • 120 m
    • 360 m
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16. 16. A spacecraft travels at 260 000 km/h. How far does it go in 2 hours?

    • 520 000 km
    • 26 000 km
    • 130 000 km
    • 260 002 km
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17. 17. Marcus's father must travel 50 km in 2 hours. What average speed is needed?

    • 100 km/h
    • 48 km/h
    • 25 km/h
    • 52 km/h
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18. 18. An Olympic sprinter runs 100 m in 10 s. What is the sprinter's average speed?

    • 110 m/s
    • 10 m/s
    • 0.1 m/s
    • 1000 m/s
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19. 19. A car travels 210 m in 6 s. What is its speed?

    • 1260 m/s
    • 0.03 m/s
    • 204 m/s
    • 35 m/s
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20. 20. An aeroplane flies 8100 km between two cities in 9 hours. What is its average speed?

    • 8091 km/h
    • 900 km/h
    • 72 900 km/h
    • 90 km/h
    Check