1. Work done is measured in
- A) joules
- B) watts
- C) coulombs
- D) newtons
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2. Which of these is NOT a store of energy?
- A) chemical
- B) gravitational
- C) friction
- D) kinetic
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3-8. Choose the correct energy store in the following sentences:
| A bow and arrow transfers
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| energy into useful
energy. |
| A car petrol engine transfers
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| energy into useful
energy. |
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A falling ball transfers
energy |
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into
energy. |
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A motor on a train converts 60 000J of electrical energy into 45 000J of kinetic energy as the train accelerates.
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| 9. How efficient is the motor? |
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| 10. If it converts this energy in 15 seconds, what is the useful power output? |
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11. What is the formula for work done?
- A) Work done = force x distance
- B) Work done = force ÷ distance
- C) Work done = mass x acceleration
- D) Work done = mass ÷ acceleration
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12. A tractor pulls a plough 2km across a field using a force of 8kN. What is the work done? |
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