Multiple choice

Why does friction decrease efficiency of machines?

  1. Consumption of heat due to used force.

  2. Generation of heat due to pressure.

  3. Consumption of heat due to friction.

  4. Generation of heat due to friction.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Friction between moving parts in a machine generates heat as a byproduct. This heat energy is dissipated into the surroundings rather than being converted into useful work, which reduces the overall energy efficiency of the machine.

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