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 form of stored energy?
- A) chemical
- B) gravitational potential
- C) wind
- D) kinetic
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3-8. Choose the correct energy store in the following systems:
| 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. |
| A falling ball transfers
energy |
| into
energy. |
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Q9+10: A motor on a train converts 60 000J of electrical energy into 45 000J of kinetic energy.
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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 = F x d
- B) Work done = F / d
- C) Work done = m x a
- D) Work done = m / a
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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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