High Speed

Why does high speed need less torque to keep the motorcycle moving?

At high speed, we shift at higher gears which exert much less torque on to the wheel. Why does at high speed, we need less torque to keep the motorcycle moving?

The only reason for torque T = fr when up and running steady, no matter what the rpm, is to overcome the friction in the hubs that would stop the wheels if a net force f were not imposed on the wheel hubs with radius r.

The net force f = ma = P - F is applied to the hubs, where F is the friction force acting in the direction opposite to P which is the power force pushing the hub around. As you can see, when the cycle is at constant speed and a = 0, P = F, meaning the only torque Pr needed to keep going is whatever it takes to offset the friction torque Fr.

But as the cycle is accelerating and a > 0, we need P - F > 0 meaning Pr > Fr and the torque applied Pr must exceed the frictional torque Fr. So we need more torque to get up to speed, but once we're there we can back off a bit to keep up whatever speed we've gotten to.

coldplay high speed

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