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Eighth Grade (Grade 8) Energy and Momentum Questions

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Grade 8 Energy and Momentum
                is the rate at which work is done.
  1. Work
  2. Power
  3. Force
  4. Speed
Grade 8 Energy and Momentum
Zach applies a force of 300 N while moving a box 4 meters. How much work did he do?
  1. 0 joules
  2. 1,200 joules
  3. 1,200 newtons
  4. 75 joules
Grade 8 Energy and Momentum
A generator converts mechanical energy to                 energy.
  1. heat
  2. electrical
  3. radiant
  4. chemical
Grade 8 Energy and Momentum
Which of the following conditions must be met for work to be done?
  1. A force must be applied.
  2. There must be movement over a distance.
  3. The direction of force and movement must be the same.
  4. All of the above.
Grade 8 Energy and Momentum
Which of these BEST describes the energy transformations in a coal-fired power plant?
  1. Mechanical to Chemical to Electrical to Thermal
  2. Electrical to Chemical to Mechanical to Thermal
  3. Thermal to Chemical to Electrical to Mechanical
  4. Chemical to Thermal to Mechanical to Electrical
Grade 8 Energy and Momentum
A woman holds a 400 N weight 2 meters above the ground. How much work is being done?
  1. 0 Joules
  2. 800 Joules
  3. 200 Joules
  4. 3200 Joules
Grade 8 Energy and Momentum
Which of the following changes electrical energy into kinetic energy?
  1. transformer
  2. electric motor
  3. generator
  4. superconductor
Grade 8 Energy and Momentum
What enables water to do work?
  1. Gravity
  2. Waves
  3. Sediment
  4. Windmills
Grade 8 Energy and Momentum
In the formula for work, what does the f stand for?
  1. friction
  2. efficiency
  3. force
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