Question

An object with a mass of `3 kg` is hanging from an axle with a radius of `9 cm`. If the wheel attached to the axle has a radius of `27 cm`, how much force must be applied to the wheel to keep the object from falling?

Answer 1

The force is `=9.8N`

Explanation:

The load `L=(3g)N`

Radius of axle `r=0.09m`

Radius of wheel `R=0.27m`

Taking moments about the center of the axle

`F*R=L*r`

`F*0.27=3g*0.09`

`F=(3*g*0.09)/0.27=9.8N`

The force is `F=9.8N`