Question

A wrench with a length of `12 cm` is being used to unscrew a `3 cm` bolt. If a torque of `5 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 torque required to unscrew is 5Nm but the force on the wrench is 37.03N

Explanation:

Torque is always to the center of the rotated object.

Assuming you mean bolt diameter is 3cm, so radius is1.5cm

The torque which holds it is 5Nm which is 500N-cm

So `500/(12 +1.5)` is the force required to unscrew the bolt.

That equals : `37.03N`