Question

part c
how does the force needed to turn the wrench change if you increase the lever arm?
view available hint(s)
it increases.
it decreases.
it stays the same.

Explanation:

The torque ($\tau$) is given by $\tau = rF\sin\theta$, where $r$ is the lever - arm length, $F$ is the force, and $\theta$ is the angle between the force and the lever - arm. Assuming the torque required to turn the wrench is constant (to overcome a certain resistance), and $\sin\theta$ remains the same, if $r$ increases, then $F$ must decrease to keep $\tau$ constant.

Answer:

B. It decreases