Question

A crowbar 2727 in. long is pivoted 66 in. from the end. What force must be applied at the long end in order to lift a 600600 lb object at the short​ end?

Answer 1

To solve this problem we will apply the concepts related to equilibrium, for this specific case, through the sum of torques.

`\sum \tau = F*d`

If the distance in which the 600lb are applied is 6in, we will have to add the unknown Force sum, at a distance of 27in - 6in will be equivalent to that required to move the object. So,

`F*(27-6)= 6*600`

`F = (6*600)/(21)`

`F= 171.42 lb`

So, Force that must be applied at the long end in order to lift a 600lb object to the short end is 171.42lb