Question

If you have to apply 40 N of force to a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?

Answer 1

The AMA is calculated as:
AMA = force obtained / force applied
AMA = 400 / 40
AMA = 10

Answer 2

Answer: 10 is the actual mechanical advantage of the crowbar.

Explanation:

Force exerted on the crowbar,Input force$F_I$ = = 40 N

Force exerted by the crowbar,Output force $F_O$  = 400 N

Actual Mechanical Advantage :

$\frac{F_O}{F_I}=\frac{400 N}{40 N}=10$

10 is the actual mechanical advantage of the crowbar.