Question

Friction reduces efficiency of machines due to:

• A. Production of heat
• B. Wearing out of moving parts
• C. Increase in energy consumption
• D. AlI of the above

Answer 1

The correct option is D AlI of the above

Answer is D.

Efficiency is relate to energy conversion performance. A system that can convert energy entirely and completely into energy of another form performs the conversion at 100% efficiency.
The heat produced by friction cannot be used to recover 100% of the mechanical energy that was converted into heat, the effect of friction is to reduce the (energy conversion) efficiency of machines.
The parts of the machine wear and tear due to contimuous usage.
More the friction more the enrgy consumption.
Hence, all the options are correct.