Question

4. The output energy of a real life machine isless than input energy because of :
(a) moving parts of machine
(b) friction at the moving parts
(c) both (a) and (b) (d) none of these ​

Answer 1

Answer:

friction and moving parts

Answer 2

Answer:

(c) both (a) and (b)

Explanation:

This happens because in an actual machine some of the input energy is used in moving the parts of the machine and overcoming the friction. So, the output energy of the actual machine is less than the input energy.