The Physics of Work, Energy and Power

11 questions covering topic 2.9 Work, Energy and Power. Requires knowledge of the equations related to those three terms and their definitions as well as some of the conservation laws of mechanics.

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1. The equation which represents the work done on an entity is...? (given that values s is the extension vector and F is a force at an acute angle)

  • Work Done = Fcosθ x Δs
  • Work Done = Fcosθ x s
  • Work Done = Fsinθ x s
  • Work Done = Fsinθ x Δs
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Other questions in this quiz

2. When stretching a spring, the force applied is roughly proportional to it's extension.

  • True
  • False

3. What is the definition of Energy and it's effect?

  • Energy allows body A to do work on body B, transferring energy from body B to body A
  • Energy allows body A to do work on body B, transferring energy from body A to body B
  • Energy is a scalar quantity equal to the power trapped ib mass
  • Energy is the property held by any moving mass

4. For a spring, the area under a graph of Force (y axis) against Extension (x axis) (and therefore work done) can be calculated by...? (where s is the vector of extension parallel to force F)

  • Area = 2FΔs
  • Area = Fs
  • Area = ½FΔs
  • Area = FΔs

5. For a spring, the work done in extending the spring can be expressed by the equation...?

  • Area = ½F(Δs^2)
  • Area = ½(F^2)Δs
  • Area = F(Δs^2)
  • Area = 2F(Δs^2)

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