Question

a boy uses a single fixed pulley to lift a load of 100 kgf to some height another boy uses a single movable pulley to lift the same load to same height i compare the effort applied by them ii give reason to your answer

Answer 1

Load to be lifted F

load

=50 kgf

Case 1 : Fixed pulley is used.

MA for single fixed pulley MA=1

Thus effort applied by the boy F

effort

=

MA

F

load

=

1

50

=50 Kgf

Case 2 : Movable pulley is used.

MA for movable pulley MA=2

Thus effort applied by the boy F

effort

=

MA

F

load

=

2

50

=25 Kgf

So, effort to be applied by the boy is less in case when he used a movable pulley because MA for a movable pulley is greater than 1.

Answer 2

$25kgf \: is \: your \: correct \: answer$

Hope it helps❤️❤️❤️❤️