General Secondary Certificate (Tawjihiya Kuwait) · Physics and Chemistry

Energy

10 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 10 questions

  1. A machine takes in 800 J of energy and gives out 320 J of useful energy. What is its efficiency?
  2. A force of 80 N acts at 60° to the horizontal on a box, moving it 10 m horizontally. How much work does the force do? ()
  3. A constant force of 80 N pushes a box 2 m along a floor in the direction of the force. How much work is done?
  4. A force of 50 N acts at 60° to the horizontal on a box, moving it 10 m horizontally. How much work does the force do? ()
  5. A constant force of 120 N pushes a box 10 m along a floor in the direction of the force. How much work is done?
  6. What is the SI unit of energy?
  7. A 2 kW electric kettle is switched on for 3 minutes. How much electrical energy does it use?
  8. A machine transfers 600 J of energy in 2 minutes. What is its power?
  9. A 60 kg climber gains 30 kJ of gravitational potential energy. How high has she climbed? (Take m/s.)
  10. A motor lifts a 50 kg load through a height of 12 m in 20 s. What is its useful power output? (Take m/s.)

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