Best Answer

Acceleration is defined as the change in velocity divided by the time or

a = (vf - vi)/t

Velocity measures the speed and the direction of an object.

In uniform circular motion, the object has the same speed but it is always changing direction and so, by the definition of acceleration, the object is considered accelerating. If this acceleration doesn't exist, the object would move in a straight line according to Newton's laws of motion.

More answers

Acceleration involves a change in velocity. In the case you mention, the speed doesn't change, but the velocity does. The term "velocity" includes the direction of the movement, and the direction does change.

The reason is that acceleration is defined as the change in velocity per unit time. Velocity is a vector, it points in the direction of motion. Speed on the other hand is just the length of the velocity vector, which remains constant in circular motion (unless the strength of the centripetal force is allowed to vary).

Velocity is not constant, after all the direction of motion in circular motion constantly changes! Therefore there is an acceleration; the direction of the velocity changes (which is thus a change in velocity).

Because "acceleration" doesn't mean 'speeding up'. It means any change in

the speed or direction of motion.

The only motion that's not accelerated is motion at a constant speed in a

straight line. If the speed is increasing, or the speed is decreasing, or the

direction is changing, that's acceleration.

Velocity is a vector quantity, meaning it has a size and a direction.

The size is what we call "speed".

But a change in direction only is still a change in the velocity.

Any change in velocity ... even if only a change in direction ... is called "acceleration".

Q: Why does an object in uniform circular motion exhibits acceleration when its speed is constant?

Write your answer...

Submit

Still have questions?

Continue Learning about Physics

yes, acceleration is constant in uniform circular motion

acceleration

If the motion is truly in the form of a circle, the phrase uniform circular motion describes it appropriately. This means that the object is in a constant state of motion about a fixed point at a constant distance from that point. Circular motion can be considered an acceleration, because an acceleration describes any change in velocity or direction. Since circular motion involves constant change in direction, the object exhibits constant acceleration.

yes, acceleration is constant in uniform circular motion

An object in uniform circular motion undergoes constant acceleration but moves at constant "speed".Constant "velocity" means no acceleration.

Related questions

yes, acceleration is constant in uniform circular motion

acceleration

If the motion is truly in the form of a circle, the phrase uniform circular motion describes it appropriately. This means that the object is in a constant state of motion about a fixed point at a constant distance from that point. Circular motion can be considered an acceleration, because an acceleration describes any change in velocity or direction. Since circular motion involves constant change in direction, the object exhibits constant acceleration.

yes, acceleration is constant in uniform circular motion

An object in uniform circular motion undergoes constant acceleration but moves at constant "speed".Constant "velocity" means no acceleration.

This statement is true. This type of movement is called Uniform Circular Motion. For every circular motion at constant speed, there is a constant radial acceleration (always pointing towards the center of the circle) named centripetal acceleration. This constant acceleration ensures that at every moment during the motion the orientation of the velocity is changed so that the object stays in a circular path.

If body is moving in a circle with uniform or constant speed its acceleration will be uniform as velocity i.e. to say direction is changing at every point.

Because within circular motion, acceleration is constant

Because there is no tangential force acting on the object in uniform circular motion. The proof that there is no tangential component of acceleration is the fact that the tangential component of velocity is constant.

Objects moving in uniform circular motion will have a constant speed, and two objects with the same acceleration have a constant velocity.

In uniform circular motion, what quantities are constant?

If the speed is constant, the acceleration is toward the center of the circle.