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Why does a car's engine have to run all the time just to keep the car moving at the same speed?
Wiki User
∙ 14y ago
As the car moves forward, it pushes against the air in front of it. That air pushes back against the car with the same amount of force (Newtons Third Law of Motion: for every action there is an equal and opposite reaction). This slows the car the same as if anything else were in front of the car pushing back against it.
In addition, the friction that allows the tires to grip the road also robs the car of some of its momentum. This is the same process that occurs if you try to slide across the floor in your socks. Even on a slippery floor, there is some friction, and you will slow down eventually.
In a vacuum, however, none of this would be true. In a vacuum, there is no air, so nothing to push back against the car. There is also no roadway or other material to create friction and slow the car. In a vacuum, once a car (or rocket, or anything else) is accelerated to a certain speed, it will continue traveling at that speed forever unless you slow it down again by accelerating it in the opposite direction (or you run into something like a star!)
Wiki User
∙ 14y ago
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What is the difference between moving at a constant speed and not moving at all?
None, as "not moving at all" is just moving at a constant speed of zero. Special relativity shows that there is nothing unique or different about zero speed. It is just a value of constant speed.
How friction decreases d speed of an moving object?
friction is nothing but just the opposite force acting on any moving object...... it hence decreases the speed of a moving object as the object is obstructed in its path
What is the relationship between centripetal force and speed?
centripetal force is the object moving in a circular orbit, speed is just how fast it does it
Explain why a high-speed collision betwwn two cars wodl cause more damage than a low-speed collision between the same cars?
EK=.5mv(squared)The faster something is moving, the more energy it is considered to have. When two objects collided, that energy doesn't just go away, it needs to be transformed or transfered, and that is exactly what happens.When 2 vehicles collide, the kinetic energy they had is used to bend metal, create heat, and do other destructive things. The faster the cars are moving, the more energy they have, and the more energy for destruction they have.
What is the frame of reference for position speed and acceleration?
The frame of reference with regard to postion, speed and acceleration is just your perspective in measuring speed, position, or acceleration. Say you are watching a horse and a train moving alongside each other in the same direction. If you are standing on still ground, you observe the horse and the train moving at a certain speed relative to you. Let's assume this speed is three meters per second. Now suppose you are on the train looking at the horse, which is still moving at the same speed in the same direction. You will see the horse moving at zero meters per second relative to you, because both you and the horse are moving at the same speed. Even though you are both moving, the horse will still move along side you as if you and the horse are standing perfectly still. The frame of reference with regard to postion, speed and acceleration is just your perspective in measuring speed, position, or acceleration. Say you are watching a horse and a train moving alongside each other in the same direction. If you are standing on still ground, you observe the horse and the train moving at a certain speed relative to you. Let's assume this speed is three meters per second. Now suppose you are on the train looking at the horse, which is still moving at the same speed in the same direction. You will see the horse moving at zero meters per second relative to you, because both you and the horse are moving at the same speed. Even though you are both moving, the horse will still move along side you as if you and the horse are standing perfectly still.
Where can someone watch videos of fast moving cars?
One can watch videos of fast moving cars on YouTube. YouTube has a variety of different videos that show cars moving at high rates of speed, whether it's for stunts or just racing around a track to win a prize.
What is the difference between moving at a constant speed and not moving at all?
None, as "not moving at all" is just moving at a constant speed of zero. Special relativity shows that there is nothing unique or different about zero speed. It is just a value of constant speed.
Why is it that when cars pass each other going a high speed you feel like to are being pulled towards them?
This is because of your eyes. It's sort of like an optical illusion, but it is just your eyes moving.
What cars will a 572 engine fit into?
All cars. Just takes some slicing and dicing.
How friction decreases d speed of an moving object?
friction is nothing but just the opposite force acting on any moving object...... it hence decreases the speed of a moving object as the object is obstructed in its path
How do you buy racing cars in need for speed shift?
just buy racing cars:- but where form they are not in any of the car shop things?
How do Victorian car engine work?
The Victorian era ended in 1901 just at the birth of the automobile. The first Diesel, Petrol engine cars were being built. Electric cars and Steam cars were around also.
What is the relationship between centripetal force and speed?
centripetal force is the object moving in a circular orbit, speed is just how fast it does it
How do you turn on the engine for a Honda?
Turn the key, just like in other cars.
What causes the temperature to go up when idling and down when moving on a 1994 Ford Explorer 4.0?
As long as the engine temperature doesn't move into the extremely hot range, then this is just normal operation for the engine's cooling system. When an engine is running at idle speed with the vehicle stopped, there is no air flow coming through the grill to assist in cooling the radiator. Only the engine's fan system is doing any of the cooling at idle speed. For this reason, the engine temperature will increase somewhat at idle in a non-moving vehicle. Once you start moving, even though the engine RPMs increase causing more heat, the air flow forced through the vehicle's front grill and through the radiator cooling fins compensates for the added heat and decreases the engine temperature. Note however, if the temperature is moving into the extreme hot area on the dash gage when the vehicle is idling and not moving, there may be issues with the engine's cooling system.
Which Ford automobiles run on a crate engine?
Ford automobiles that run on a crate engine are vehicles referred to as muscle cars. The Ford Mustang is just one of the Ford models of cars that use a crate engine.
How do forces on a moving boat affect the speed of the boat?
because it is just like that ok
