A wheelchair ramp length is 20 ft; the ramp height is 5 ft; and the effort to push the chair is 40 lbs. Using the mechanical advantage formula, is the person’s weight is 160 lbs.
Calculation
The equation for the mechanical advantage,
Is the effort multiplied by the ramp length should equal the weight of the person multiplied by the height of the ramp
(effort x ramp length= persons weight x ramp height).
For this scenario,
the equation would be effort (40 lbs) x ramp length (20 ft) = persons weight (x) x ramp height (5ft).
40 x 20 = (x) x 5
Solving for x,
the persons weight is 160 lbs.
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