Cover Wheelchair
How much work in joules does it take to push a 100kg wheelchair up a 10m rise with a 5% grade?
The wheelchair is being pushed over a good concrete surface, the main wheels are 600mm in diameter. The horizontal distance covered is 2000m. The weight is occupant and wheelchair. How much force is needed to push the wheelchair at a constant speed in Netwon metres?
a) Work done is independent of the gradient
W = mgh = 100*9.8*10 = 9800 Joules
The speed is constant
Component of weight in the direction of the slope
= 100 / cos 85 degree
so force should exaclt balance this weight
=> F = 100 / cos 85 degree = 1147.35 Newton
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