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Doctors Medicines MCQs Q&A

  1. Washing machine pushed along a floor
  2. Sled sliding across snow
  3. A person sliding down a slide
  4. A person lifting an heavy object
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1 Answers

Option 4 : A person lifting an heavy object

CONCEPT:

  • Friction: The opposing force which opposes the relative motion between two surfaces is called friction.
  • It is denoted by f and the SI unit of the frictional force is Newton (N).

Friction (f) = μ N

Where μ is the coefficient of friction and N is the normal force between two surfaces

EXPLANATION:

  • Friction is the resistance that one surface or object encounters when moving over another.
  • A person lifting a heavy object is not an example of friction because there is no relative motion between two surfaces here. So option 4 is correct.
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