Question

A wrench with a length of `48 cm` is being used to unscrew a `6 cm` bolt. If a torque of `72 Nm` is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?

Answer 1

The force applied to the wrench must be `>= 150N`

Explanation:

Torque is `\tau=FrSin(\theta)`

The torque value in this problem is similar to static friction. Once it's overcome, the bolt will turn.

`72Nm=F*.48m`, therefore `F =150N`