Speed Resistance

Speed Resistance

When riding a bicycle at a normal speed, is more energy spent overcoming friction or air resistance?

I think there two main forces that work against you when riding a bicycle. 1. The friction on moving parts such as bicycle tires, chain, gears, etc 2. Air resistance when moving through it. What is the most important factor?

Actually there are three forces, friction, resistance wind and gravity. On a flat road, aerodynamic drag is by far the biggest obstacle to the speed of a cyclist, representing 70 to 90 percent of resistance felt when pedaling. The only major obstacle is climbing a mountain: the effort required to pedal a bike uphill against the force of gravity overcomes more than the effect of wind resistance. EDIT: Glenn Nice site, but the energy expended (calories or watts), can not be claimed on the desent. After that the crest of a hill, all you get is a chance to recover, the energy expended gone. All to take into account a steep slope over time that it takes up is considerably longer than it takes to download. A pilot can only develop a certain amount of watts, in the plains of wind # 1 is the limiting factor, toss in a steep slope and the wind factor becomes a much smaller degree than the angle increases. Your link will verify this. I think we're losing point of the question. This is not PE, but the energy of a pilot uses, if you are driving at 300 watts and to stop pedaling or coasting down a hill is spending 0 Watts, as a pilot you can not get the energy previously expended ago, at this point as the pilot are neither saving, storing or expend energy to keep the bike moving. This is Strickly energy of the driver outputs to over come the forces of friction, air resistance. and gravity to keep your bike moving.

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