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Eighth Grade (Grade 8) Energy and Momentum Questions

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Grade 8 Energy and Momentum
If you do the same amount of work in a shorter time, which of the following is true?
  1. your efficiency decreased
  2. your power increased
  3. you must be using a machine
  4. none of the above
Grade 8 Energy and Momentum
What energy types are used in everyday life?
  1. Kinetic energy
  2. Electrochemical energy
  3. Potential energy
  4. Electric energy
  5. Thermal energy
  6. Chemical energy
Grade 8 Energy and Momentum
Which situation is an example of increasing potential energy?
  1. a bicyclist stopping at a stop sign
  2. a cat jumping from a tree
  3. emptying a bucket of water
  4. pulling a wagon uphill
Grade 8 Energy and Momentum
A force of 150 N is applied to a sphere which rolls 75 m. How much work has been done?
  1. 11,250 J
  2. 2 J
  3. 11,250 N
  4. 2 N
  5. None of the above
Grade 8 Energy and Momentum
When is the potential energy the greatest in a roller coaster?
  1. at the bottom of the first hill
  2. at the top of the first hill
  3. at the top of the second hill
  4. at the bottom of the second hill
Grade 8 Energy and Momentum
Which is an example of potential energy?
  1. rolling ball
  2. stretched rubber band
  3. bike at the bottom of a hill
  4. bike coasting down a hill
Grade 8 Energy and Momentum
Gasoline is an example of what kind of energy?
  1. Mechanical
  2. Chemical
  3. Nuclear
  4. Kinetic
Grade 8 Energy and Momentum
Give 3 examples of mechanical energy.
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