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Q: Work can only be done when ___is present.
  • A. Energy
  • B. Force
  • C. Momentum
  • D. Power
Correct Answer: Option A - Work can only be done when energy is present. Energy is the ability to do work. Energy is a conserved quantity and the law of conservation of energy states that energy can neither be created nor be destroyed but can only be converted from one form to another. Work and energy both has same S.I unit Joule (J) Both are a scalar quantities.
A. Work can only be done when energy is present. Energy is the ability to do work. Energy is a conserved quantity and the law of conservation of energy states that energy can neither be created nor be destroyed but can only be converted from one form to another. Work and energy both has same S.I unit Joule (J) Both are a scalar quantities.

Explanations:

Work can only be done when energy is present. Energy is the ability to do work. Energy is a conserved quantity and the law of conservation of energy states that energy can neither be created nor be destroyed but can only be converted from one form to another. Work and energy both has same S.I unit Joule (J) Both are a scalar quantities.