During constant acceleration, either the object's speed changes at a constant
rate, or the direction of its motion changes at a constant rate, or both.
Acceleration is the rate of change of velocity. Even if an object's speed is constant, acceleration can still occur if the direction of the object's motion changes. For example, when an object moves in a circle at a constant speed, it is undergoing acceleration towards the center of the circle due to the change in its direction of motion.
An object that moves with constant position will have constant velocity or acceleration. This is said to be moving in positive direction and maintains the position.
The velocity increases at a constant rate.
There is only acceleration if the car's velocity changes. If it moves at a constant velocity, then there is no acceleration.
An object moving with uniform acceleration has a uniform change in velocity over time, and its velocity-time graph will be a straight line with either a positive or negative slope. An object moving with no acceleration has constant velocity, and its velocity-time graph will be a straight, horizontal line with zero slope. Refer to the related link for illustrations.
Both are definitely zero
Constant velocity means that the object's speed is constant, and it moves in a straight line, i.e. the direction of its motion is also constant. When an object moves in a manner consistent with this description, probability dictates that sooner or later, it bumps into something.
It velocity is constantly increasing, v=vo + at.
In uniform circular motion, the speed of the object remains constant, but the velocity changes direction continuously. The acceleration is directed towards the center of the circle (centripetal acceleration) and its magnitude remains constant. The object moves in a circular path at a constant speed.
If an object moves in a circle at a constant speed, the magnitude of the acceleration won't change.
It's called 'centripetal acceleration', whether or not the speed is constant or the path circular.
a big bad boy