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Energy, Work and Power quiz for Singapore N(A)-Level Science (Physics) (SEAB 5105/5106) quiz

13questions. Pick an answer and you'll see why right away.

  1. The principle of conservation of energy states that energy:

  2. What is the SI unit of energy?

  3. A 2.0 kg2.0\ \text{kg} ball moves at 4.0 m s−14.0\ \text{m s}^{-1}. What is its kinetic energy?

  4. A box of mass 3.0 kg3.0\ \text{kg} is lifted 2.0 m2.0\ \text{m}. Taking g=10 N kg−1g = 10\ \text{N kg}^{-1}, what is the gain in gravitational potential energy?

  5. A force of 40 N40\ \text{N} moves an object 5.0 m5.0\ \text{m} in the direction of the force. What is the work done?

  6. Power is defined as:

  7. A machine does 900 J900\ \text{J} of work in 30 s30\ \text{s}. What is its power?

  8. A lamp takes in 100 J100\ \text{J} each second and gives out 20 J20\ \text{J} of light each second. What is its efficiency?

  9. When a ball falls freely, which energy change happens (ignoring air resistance)?

  10. Why is no real device 100 percent efficient?

  11. Which store of energy does a stretched rubber band have?

  12. Two cranes lift the same load to the same height, but crane A is faster. Compared with crane B, crane A has:

  13. A ball of mass 0.50 kg0.50\ \text{kg} falls and loses 25 J25\ \text{J} of gravitational potential energy. Ignoring air resistance, what is its kinetic energy gain?