15 votes

Where does "excess" energy go when a vehicle uses a lower gear to move at a given speed?

the amount of energy used per engine revolution is fixed (not precisely true I know) This is the error. The work per engine revolution is the torque at the engine. If the energy dissipation per wheel ...
Dale's user avatar
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9 votes

Where does "excess" energy go when a vehicle uses a lower gear to move at a given speed?

Ignoring all losses from the gearbox on to the wheels, let’s just look at the engine. Internal combustion engines are about 30% efficient. About 65% of the energy is lost as heat, 5% as friction. ...
Rich's user avatar
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6 votes

Where does "excess" energy go when a vehicle uses a lower gear to move at a given speed?

If you are in a situation where the energy used to keep the car moving is unchanged, but you are putting more energy into the engine, then the difference must be losses in the engine. Whether you are ...
Cort Ammon's user avatar
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2 votes
Accepted

Understanding conservation of angular momentum in relation with rotating objects

There is most certainly an internal centripetal force within the material keeping it in circular motion. In real objects, this is provided by the intermolecular/interatomic forces, which are never ...
Vincent Thacker's user avatar
1 vote

Where does "excess" energy go when a vehicle uses a lower gear to move at a given speed?

At the same vehicle speed, a lower gear requires more revolutions but less force — you don't need to depress the gas pedal all the way in the lower gear but may have to in a higher gear. But in the ...
Peter - Reinstate Monica's user avatar
1 vote

Understanding conservation of angular momentum in relation with rotating objects

There is no centripetal force acting on the ball that keeps it in circular motion This is not correct. Each part of the ball is held in place because it is connected to the surrounding parts of the ...
gandalf61's user avatar
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