Question

An object with a mass of `3 kg` is hanging from an axle with a radius of `14 m`. If the wheel attached to the axle has a radius of `21 m`, how much force is needed to raise the object?

Answer 1

The force is `=19.6N`

Explanation:

The load is `L=3gN`

The radius of the axle is `r=14m`

The radius of the wheel is `R=21m`

The effort is `=FN`

The acceleration due to gravity is `g=9.8ms^-2`

Taking moments about the center of the axle

`F*21=3g*14`

`F=(3g*14)/2=19.6N`

The force is `F=19.6N`