Question

A machine is said to have low efficiency if it experiences a lot of energy loss to heat. How can a machine be made more efficient?

a
by increasing electrical energy
b
by reducing magnetic energy
c
by increasing gravity
d
by reducing friction

Answer 1

A machine can be made more efficient **d** by reducing friction. Reducing friction minimizes energy loss that occurs as heat, allowing more of the input energy to be converted into useful work.