Pedals Cycling Bike

Pedals Cycling Bike

Need help with a calculation basis of the physical problem.Calculating work done by friction when pedaling a bike up the hill?

A cyclist pedaling 1200J working up to a maximum 6m hill. The speed of the cycle is at the bottom and top are 15 m / s and 10m / s, respectively. The cyclist and the cycle have a combined mass of 70 kg. What is the work done by friction?

v1 = 15m / s v2 = 10m / s, h = 6m, m = 70 kg = 1200 W J is the work done by the cyclist ΔEkin = W + + ΔEpot Wfric ΔEkin = m (v2 ^ 2-v1 ^ 2) / 2 = 70 (10 ^ 2-15 ^ 2) / 2 =- 4375 ΔEkin J = mgh ΔEpot = 70 * 9.8 * 6 = 4116 == Wfric J> = W-ΔEkin-ΔEpot = 1200 - (-4375) -4116 = 1200 +4375-4116 = 1459 J

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