Given :
A clever inventor arranges ropes and pulleys to lift a heavy log. The log weighs 2,000 newtons.
To Find :
If she pulls 10 meters of rope to lift the log 2 meters, what force does she apply to the rope.
Solution :
Mechanical advantage is :
[tex]M.A = \dfrac{10}{2}\\\\M.A = 5[/tex]
Also, mechanical advantage is given by :
M.A = Output Force/Input Force
Input Force = Output Force/M.A
Input Force = 2000/5
Input Force = 400 N.
Therefore, she will apply 400 N to the rope.
