0
When your car moves along the highway at a constant velocity the net force is 0 why then do you continue running your engine?
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.
What else can I help you with?
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.
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.
Who has the most kinetic energy a person running in a race or a plane in flight?
A plane in flight would have more kinetic energy than a person running in a race. This is because kinetic energy is directly proportional to an object's mass and velocity, and a plane's mass and velocity are much greater than that of a person.
What is a good sign in a river that the velocity of the running water has changed at a certain point?
A good sign that the velocity of running water has changed at a certain point in a river is the presence of ripples or turbulence on the surface, visible debris moving faster or slower than the surrounding water, or a change in the color or clarity of the water. These external indicators can help identify areas of differing flow velocities.
How can you change an objects velocity?
To change an object's velocity, you can apply a force in the direction you want it to accelerate. This force can be produced by pushing, pulling, or using any other method of applying force to the object. Additionally, altering the mass of the object or the direction of the force can also change its velocity.
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?
Yes, a person running in a circular track at a constant speed of 7mph is an example of constant velocity and zero acceleration. While the person is changing direction, their speed remains constant, resulting in a steady velocity. Acceleration would only occur if there were a change in speed or direction.
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.
Why is a person running around a circular track at a constant speed accelerating?
Even though the person is moving at a constant speed, they are changing direction constantly as they go around the track. Since acceleration is defined as any change in velocity, and velocity includes both speed and direction, the person running on a circular track is experiencing acceleration.
What is the best to say about a runner who is running at a constant velocity?
The runner is maintaining a steady speed and covering equal distances in equal time intervals.
Is a jogger moving at a constant speed accelerating?
No. An object is accelerating if it is changing speed or direction of travel. Since the person in question is running at a constant speed in a straight line, they are not accelerating.
Is a person running an example of non uniform motion?
Yes, a person running is an example of non-uniform motion because their speed and direction are changing as they move. This is in contrast to uniform motion, where an object travels at a constant speed and in a straight line.
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.
What is best to say about a runner who is running at a constant velocity?
Their acceleration is zero.
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.
