I have another question about my homework.
When a car stops, why should you have the engine running?
-Is it because you need to have friction between the car and the road inorder to make it run?
If it was a hybrid car, you wouldn't have to keep the engine running. It would stop automatically and start immedialely with an electric motor when the car has to start again.
With a gasoline-only car, you need to keep the engine running to be able to move away without wasting a lot of fuel and battery energy restarting the engine.
a story of how the pulley got its name
When a car stops, it is not necessary to keep the engine running. In fact, it is actually recommended to turn off the engine when the car is stopped for an extended period of time to conserve fuel and reduce emissions. The belief that a running engine is needed to maintain friction between the car and the road is a common misconception.
Friction between the car's tires and the road is primarily provided by the tires themselves, not the engine. The interaction between the tire rubber and the road's surface creates the necessary friction to allow the car to start, stop, and maintain control while driving. The engine's primary role is to provide power to move the car forward or backward.
However, there are certain instances when it might be necessary to keep the engine running when stopping the car, such as:
1. Traffic signals: If you anticipate that the waiting time at a traffic signal will be short (a few seconds), you can keep the engine running to prevent unnecessary wear on the starter motor from multiple restarts.
2. Safety considerations: In certain situations, it may be advisable to keep the engine running for safety reasons, such as when stopped on a busy road or in extreme weather conditions where the engine is needed for heating or cooling.
3. Accessories and systems: Some modern cars have systems or accessories that require the engine to be running, such as air conditioning, power steering, or charging electronic devices. In such cases, you may need to keep the engine running until you finish using these features.
In conclusion, while it is not necessary to keep the engine running when a car stops, there may be specific situations where it is advisable or required. It's always important to consider fuel efficiency, emissions, safety, and the specific requirements of your vehicle when deciding whether to keep the engine running or turn it off.