A wrench with a length of #20 cm# is being used to unscrew a #4/3 cm# bolt. If a torque of #1 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?

1 Answer
May 17, 2016

Answer:

The torque is the same to screw and to unscrew.

Explanation:

I suppose that you are asking for the perpendicular force applied at the wrench extremity to get a torque of #1#[Nm]. In this case #f# value can e extracted from the equality#f times 0.20=1#. Solving for #f# we obtain #f = 5#[N]