Question

An object with a mass of `3 kg` is hanging from an axle with a radius of `2 m`. If the wheel attached to the axle has a radius of `12 m`, how much force is needed to raise the object?

Answer 1

The force is `=4.9N`

Explanation:

The load `L=(3g)N`

Radius of axle `r=2m`

Radius of wheel `R=12m`

Taking moments about the center of the axle

`F*R=L*r`

`F*12=3*g*2`

`F=(3*g*2)/12=1/2g=4.9N`

The force is `F=4.9N`