Multiple choice

Friction has both advantages and disadvantages. In which case is friction a disadvantage?

  1. Applying brakes

  2. Writing

  3. Walking

  4. Running a machine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct. In running a machine, if friction is there in machine more power is required. As it produces heat in many parts of the machine, some useful energy is wasted as heat energy. Engines of automobiles consume more fuel which is a money loss.

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