Question

The efficiency of a machine is always less than 100% because part of the energy input is used to

A. stop the machine after work
B. perform useful work on the load
C. overcome friction
D. lift the machine up​

Answer 1

C. Overcome Friction

Step-by-step explanation:

When using any machine usually those with moving parts, you may notice heat forming near the areas where most movement occurs. As friction continues, more energy is used up and released as heat. For that reason, the efficiency of a machine will forever be less than 100%