# Lifting Wheels

## Lifting wheels - loads and effort force

The effort force for a lifting wheel can be calculated as

F = W d / D (1)

where

F = effort force (N)

W = F_{g }

= m a_{g }

= gravity force - weight of body (N, lb)

d = wheel inner diameter (m, ft)

D = wheel outer diameter (m, ft)

m = mass of lifted body (kg,)slugs

a_{g}= acceleration of gravity(9.81 m/s^{2},32.17405 ft/s)^{2}

### Example - Effort Force with a Lifting Wheel

A body with mass *100 kg* is lifted with a lifting wheel with inner diameter *0.1 m* and outer diameter *0.3 m*. The effort force can be calculated as

F = (100 kg) (9.81 m/s^{2}) (0.1 m) / (0.3 m)

= 327 N

= 0.33 kN

### Lifting Wheel Calculator

David Vinter [CC-BY-SA-2.0], via Wikimedia Commons

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