An object is accelerating when its speed or direction changes
Acceleration means that the velocity (NOT necessarily the speed) changes over time.
Any of these three things means acceleration:
-- speed is increasing
-- speed is decreasing
-- direction of motion is changing, like driving on a curve
When an unbalanced force acts on it.
An object is not accelerating when it is moving in a straight line at an unchanging speed (which may be zero).
An object that is accelerating may be slowing down, gaining speed, and changing direction.
An accelerating object is one that is changing in either speed or direction. Thus any object that is turning is accelerating while maintaining a constant speed.
The object's velocityi will change.
Accelerating
An object is not accelerating when it is moving in a straight line at an unchanging speed (which may be zero).
An object that is accelerating may be slowing down, gaining speed, and changing direction.
An accelerating object is one that is changing in either speed or direction. Thus any object that is turning is accelerating while maintaining a constant speed.
The object's velocityi will change.
Accelerating...or was accelerating.
Accelerating
An object that is accelerating may slow down, speed up, or change direction.
If the force acting upon an object are balanced then the object must not be accelerating
An object with a constant (vector)velocity is not accelerating. An object with a constand (scalar)speed can actually be accelerating, a car with a constant speed that passes around a corner is changing direction and is subjected to a lateral acceleration.
moving
When an object slows down it is still accelerating.
Assuming the object is in free fall the only thing that can keep the object from accelerating in the opposing force of kinetic friction upward by air (known as air resistance).