Question

An object with a mass of `18 kg` is hanging from an axle with a radius of `15 cm`. If the wheel attached to the axle has a radius of `60 cm`, how much force must be applied to the wheel to keep the object from falling?

Answer 1

The force is `=44.1N`

Explanation:

The load `L=(18g)N`

Radius of axle `r=0.15m`

Radius of wheel `R=0.6m`

Taking moments about the center of the axle

`F*R=L*r`

`F*0.6=18*g*0.15`

`F=(18*g*0.15)/0.6=44.1N`

The force is `F=44.1N`