Question

Wrenches used to open nuts have long arms?

Answer 1

1. We know the moment of force is a product of the force applied and the distance between the pivot and the point of application of the force.
2. By increasing the size of the arms of wrenches we are increasing the perpendicular distance between the pivot and the point of application of force.
3. When wrenches having long arms are used to open nuts, more torque is produced by applying less force.

Hence, wrenches used to open nuts have long arms.