Fri July 06, 2012 By: Priyankar

whn a constant force is applied to a body moving with constant accelaration is the power of the force costant?if not how the force would gave to vary with speed for the power to be constant

Expert Reply
Sun July 08, 2012
Force, F = ma,     a constant
Work done, W = Fs,             s is displacement
Power, P = dW/dt
P = F ds/dt = Fv
Thus power varies in proportion with speed i.e. varies linearly with speed.
For constant power, Force should be inversly proportional to the speed
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