Question

give two reasons why the efficiency of a single movable Pulley is not hundred percent

Answer 1

hey Mate here is ur ans
though we calculate the mechanical advantge and velocity ratio of a single fixed pulley as 1
still efficiency of any true machine is not 100% as no machine is an ideal machine
the reason for this is
* loss of energy due to friction between moving parts of machine at the axle or in the pulley bearings so effort is more
* the weight of the moving parts of the given design of the pulley

hope it helps you

Answer 2

Answer:

it is because:

Explanation:

1. loss of energy due to friction

2. weight of the moving parts