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In which of the following situations is friction not useful?

Physics
WAEC 2022

In which of the following situations is friction not useful?

  • A. Operation of a grinding machine
  • B. Walking
  • C. Application of brakes
  • D. Moving piston in a sleeve
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Correct Answer: Option D
Explanation

 friction, force that resists the sliding or rolling of one solid object over another.

Examples of friction in our daily life

  • Driving of a a vehicle on a surface.
  • Applying brakes to stop a moving vehicle.
  • Skating.
  • Walking on the road.
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