Work done on brakes vs kinetic energy lost by vehicle

In summary, when doing work on the brakes of a car or bicycle, all of the energy removed comes from the total kinetic energy of the vehicle, unless it is going downhill at a constant velocity. The most efficient braking system is regenerative braking, which converts the kinetic energy into heat in the brake components. However, the efficiency of a braking system can vary depending on the definition used.
  • #1
mrjontyy
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When doing work on the brakes of a car or bicycle, how much of that energy is actually removed from the total kinetic energy of the vehicle?
What is the most efficient braking system?
 
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  • #2
Welcome to the PF. :smile:
mrjontyy said:
When doing work on the brakes of a car or bicycle, how much of that energy is actually removed from the total kinetic energy of the vehicle?
Yes, the kinetic energy is being converted into heat in the brake components.
mrjontyy said:
What is the most efficient braking system?
Regenerative braking.
 
  • #3
mrjontyy said:
When doing work on the brakes of a car or bicycle, how much of that energy is actually removed from the total kinetic energy of the vehicle?
What is the most efficient braking system?

All of the energy dissipated in the brakes comes from the kinetic energy of the car. ( Unless you are going down hill at constant velocity for example).

You need to define what you mean by "efficiency" in this context. Beckman has given you a good answer based on one definition.
 

What is the relationship between work done on brakes and kinetic energy lost by a vehicle?

The work done on brakes and kinetic energy lost by a vehicle are directly related. When brakes are applied, frictional forces are generated that oppose the motion of the vehicle. This results in a decrease in the vehicle's kinetic energy, which is converted into other forms of energy, such as heat and sound.

How does the weight of a vehicle affect the work done on brakes and kinetic energy lost?

The weight of a vehicle does not affect the work done on brakes, but it does affect the kinetic energy lost. A heavier vehicle will have more kinetic energy due to its larger mass. This means that more work will need to be done on the brakes to slow down the vehicle, resulting in a greater loss of kinetic energy.

Does the speed of a vehicle impact the work done on brakes and kinetic energy lost?

Yes, the speed of a vehicle directly affects the work done on brakes and kinetic energy lost. The faster a vehicle is traveling, the more kinetic energy it possesses. This means that more work will be required to slow down the vehicle, resulting in a greater loss of kinetic energy.

How does the condition of brakes impact the work done on brakes and kinetic energy lost?

The condition of brakes can greatly impact the work done on brakes and kinetic energy lost by a vehicle. If brakes are worn or not functioning properly, more work will be required to slow down the vehicle, resulting in a greater loss of kinetic energy. It is important to regularly maintain and replace brake components to ensure efficient braking and minimize energy loss.

Are there any other factors that can affect the work done on brakes and kinetic energy lost by a vehicle?

Yes, there are other factors that can impact the work done on brakes and kinetic energy lost. These include the type of braking system, road conditions, and driving habits. For example, regenerative braking systems can recover some of the kinetic energy lost and convert it back into usable energy, while driving on a slippery road surface may require more work to be done on the brakes to slow down the vehicle.

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