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When your car moves along the highway at a constant velocity the net force on it is zero Why then do you continue running your engine?
there is resistance from the brake pads constantly rubbing on the rotors and the bearings still cause a little resistance and your car is going against air and any air conditioning or heating is run by the engine and the net force is not zero
2nd Answer:
We're still missing the point, here. Forget brakes, air conditioning, etc.
Let's say that the engine propels the car down the road at a constant speed by applying, oh, let's say, +200 pounds. Let's also say that the air friction, tire friction and so forth apply a force the opposite way, trying to prevent the car moving down the road. Let's call this -200 pounds.
So, +200 lbs and -200 pounds = zero, right? This is the NET force, meaning that all the forces in different directions are all added and subtracted. Zero net force exists as long as the car travels at a constant speed.
If you want to slow down, you let off some of the engine's force (lifting the gas pedal) and add more to the friction forces. (Apply brakes).
To increase speed (you can't take away any friction forces), simply add force to the engine propelling the car by pressing on the gas pedal.
In either the slowing or the speeding up cases, the NET force is no longer zero, but more negative, or more positive, respectively.
What else can I help you with?
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 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.
