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Going back to the equation F=m·a you can see that if the force changes but the mass does not, accelleration will change as well. If mass and force do not change, accelleration will be constant.

Q: Is acceleration constant or does it change?

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constant speed=0 acceleration Acceleration is the change in speed. If the speed doesn't change(ie constant) the acceleration is zero.

There is a huge difference between constant speed and constant acceleration. Constant speed is when the object is travelling constant, no change in its velocity and acceleration or in other words no extra force to speed up. Constant acceleration when the object is acceleration constant, it means that the speed of the object is change at the same rate each second. The acceleration rate at which the object is travelling is constant. for example, when a car is stationary at a traffic light and it starts acceleration, picking up speed but the rate of acceleration will not constant because the amount of force applied differs each second due to the acceleration rate.

Certainly! By definition, the acceleration is the change, so it will change unless that amount is zero.

Yes. The equation that relates force to acceleration is very simple:F = M A ,orA = F / M .The acceleration is directly proportional to the force, and if the force doesn't change,then the acceleration doesn't change. (' M ' is the mass of the thing that's being'forced' to accelerate.)So constant force produces constant acceleration, and is the only way to do it.

gravity of earth is constant in any plane but the acceleration may vary becoz of irregular plane

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Constant speed means that speed doesn't change. Constant acceleration means that acceleration doesn't change. (If the acceleration is anything but zero, speed WILL change.)

"Acceleration" means change of velocity. If velocity is constant, then acceleration is zero.

If a velocity or speed is constant there isn't an acceleration. This is because the acceleration is the change in speed or velocity and if it's constant then there sn't a change.

constant speed=0 acceleration Acceleration is the change in speed. If the speed doesn't change(ie constant) the acceleration is zero.

No. Acceleration is change of velocity / time. If there is no change in velocity, there is no acceleration.

It has no acceleration. The definition of acceleration is the change in velocity over time, so if it is traveling at a constant speed, it has no acceleration. Also, the speed of light is a constant, which means it does not change.

change in acceleration

If the acceleration is constant, yes. However, the acceleration of an object can vary. The rate of change of acceleration is called jerk.

Centripetal acceleration

There is a huge difference between constant speed and constant acceleration. Constant speed is when the object is travelling constant, no change in its velocity and acceleration or in other words no extra force to speed up. Constant acceleration when the object is acceleration constant, it means that the speed of the object is change at the same rate each second. The acceleration rate at which the object is travelling is constant. for example, when a car is stationary at a traffic light and it starts acceleration, picking up speed but the rate of acceleration will not constant because the amount of force applied differs each second due to the acceleration rate.

No, since acceleration is defined as a change in velocity. If there is no change, there is no acceleration.

Acceleration is the CHANGE in velocity; you're assuming CONSTANT velocity. So the acceleration is zero.