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When your car moves along the highway at a constant velocity the net force is 0 why then do you continue running your engine?
Wiki User
∙ 13y ago
When moving at a constant speed or velocity, the vehicle is no longer accelerating, however there is still resistance to motion mostly from friction. The largest factors are wind resistance and road friction. It causes drag and is constantly trying to slow the car down, requiring some degree of constant power, so the net force is never truly zero.
If we could eliminate wind resistance, by let's say driving with a tail wind exactly the same speed as our forward velocity - making wind resistance zero - the power required to maintain velocity would be much less. However, there would still be drag from friction between the road and tires. Friction from moving parts inside the engine, transmission and drive axles as well as rolling resistance from the tires. Tires have treads to actually generate resistance, as the resistance they provide are required for changes in momentum essential to basic motoring -- accelerating, turning and decelerating (braking/slowing). A car with no road resistance in its tires would be able to maintain a given velocity with a lot less power, but would be impossible to grip the road to accelerate to that velocity, and would be unable to turn or slow down unless they struck another object.
There is no way to eliminate the need for power at a constant speed, but there are many things we can do to reduce the amount of power we need.
Speed limits were put in place to increase fuel efficiency - the national 55 limit arose from a concern about fuel consumption. The design of modern cars takes aerodynamics into consideration to reduce drag caused by wind resistance. There are also steps drivers can take, like making certain your tires are properly inflated, and changing air filters and oil regularly. These all contribute to making the vehicle as efficient as possible.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoYou continue running the engine to overcome the friction of the ground and the drag of the air.
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Is it possible to run round an oval running track at constant velocity?
No, it is not. At a constant speed, yes. But velocity has a direction component, and by running on (following) a curve, a change of direction (and, therefore, velocity) will have to be made. Again, note that speed can stay the same, but velocity has a direction vector associated with it that cannot be ignored.
What is a good sign in a river that the velocity of the running water has changed at a certain point?
nuffin nuffin
Who do you call after running out of gas in the middle of the highway?
If you have ran out of gas in the middle of the highway, it is best to call AAA. If you do not have an AAA membership, call a family member or friend to help you by picking up some fuel and bringing it to you.
How can you change an objects velocity?
Yes - speed is rate of change of position irrespective of direction. What an object cannot do is change direction without changing velocity, which is speed in a particular direction, i.e. a vector rather than a scalar. In vector terms, speed is the modulus of the velocity vector. An example would be a body in gravitational circular orbit around another body - constant speed, but continuously changing velocity due to the gravitational force.
Give 3 examples of scaler velocity?
There is no such thing as 'scalar velocity'. Velocity is a vector, always. A quantity that tells how fast an object is moving but doesn't tell in which direction it's moving is a scalar. That quantity is called "speed". Three examples are: -- Driving 30 miles per hour. -- Running 8 miles per hour. -- Sliding 15 feet per second.
What is best to say about a runner that is running at a constant velocity?
The best thing to say about a runner that is running at a constant velocity is simple. They are really keeping up the good work.
What is the best to say about a runner who is running at a constant velocity?
Their acceleration is zero.
What is best to say about a runner who is running at a constant velocity?
Their acceleration is zero.
Is it possible to run round an oval running track at constant velocity?
No, it is not. At a constant speed, yes. But velocity has a direction component, and by running on (following) a curve, a change of direction (and, therefore, velocity) will have to be made. Again, note that speed can stay the same, but velocity has a direction vector associated with it that cannot be ignored.
Is a person running in a circular track at 7mph an example of constant velocity at zero acceleration and if so why?
No. The velocity and acceleration are not zero because the direction is changing, thus the velocity and acceleration is changing.
Is a person running an example of non uniform motion?
His motion will be uniform if he is running in constant speed.
What is one example of velocity?
One example of Velocity is that if you are running in the same direction, your speed and velocity is the same. But if you are running AROUND the track, your speed is the same but your velocity is changing.
What would be the velocity of ball which is thrown by the man who running at the speed equal to the velocity of light?
As velocity never exceeds the velocity of light.... so i hope a man running with the velocity of light will not be able to throw a ball with any velocity.......... we may get the maximum n minimum velocity with which that can be thrown mathematically that we may get it to be zero................
What kind of motion is describing when the vehicle running at the speed of 50 kilometers per hour going to north?
The answer depends on the degree of complexity you want to put into it. At the simplest, it is linear motion at constant velocity due North. A more complicated version is that it is motion in a circular arc around the globe: heading at a constant speed towards the North pole. It is no longer a velocity because the direction is changing.
If you are running at a constant speed how should you throw the ball in order to catch it when it comes down?
Straight up in the air. It's already moving at your speed, so it's horizontal velocity will remain constant. Vertical motion and horizontal motion don't affect each other.
Why do you need to continue running your engine when your car moves along the highway at a constant velocity and the net force on it is zero?
Air and road friction constantly resist and retard a car's forward momentum, as do inclines. Some level of constant thrust is needed to countermand their effects to enable a ground vehicle to move forward at a constant speed. The reason airplanes and magnetically levitated trains are able to achieve much faster speeds than ground vehicles is they do not have to contend with friction between wheel and a road (or rail with a train). Although it impedes fuel/power efficiency, cars need a degree of road friction to enable acceleration and control (since a car's acceleration is dependent on the tires gripping the road and pulling it forward). Cars with smooth tires have less road friction, so they would require less energy to maintain a given velocity but are more difficult to alter their momentum (in any of accelerating, turning or decelerating).
Who sings Get your motor running - headed down the highway?
Steppenwolf
