(a) If the efficiency of a machine increases, the input work stays the same. This is because efficiency is defined as the ratio of useful output work to input work and does not affect the amount of input work required to operate the machine.
(b) If the efficiency of a machine increases, the useful output work increases. This is because efficiency is defined as the ratio of useful output work to input work, so an increase in efficiency implies an increase in the amount of useful output work produced for the same input work.
(c) If the efficiency of a machine increases, the friction decreases. This is because increased efficiency means that more of the input work is being converted into useful output work, leaving less energy wasted due to friction.
(d) If the efficiency of a machine increases, the mechanical advantage stays the same. Mechanical advantage is a property of the machine itself and is not affected by its efficiency.
If the efficiency of a machine increases,
what happens to each of the following?
(Use the words “increases,” “decreases,”
or “stays the same” to describe the
changes.)
(a) input work
(b) useful output work
(c) friction
(d) mechanical advantage
1 answer