# In a uniform circular motion the speed continuously changes because of the change of ___ of the body.

justaguide | Certified Educator

Speed is the distance traveled by a body in unit time. The speed of a body is independent of the direction in which it moves. The velocity of a body is the displacement in unit time. The velocity of a body is dependent on the direction of its motion. For instance, if a body goes up 5 m in a second or goes down 5 m in a second its speed is 5 m/s in both the cases, the velocity of the body on the other hand is has opposite signs.

When a body is in uniform circular motion, the distance being traveled by the body in unit time remains the same. The direction of motion is what changes continuously which means the velocity of the body is not the same.

The reason for a change in velocity is the centripetal acceleration of the body which results in a constant change in velocity and makes the body move in a circular path.

Borys Shumyatskiy | Certified Educator

Hello!

It is better to say "In a uniform circular motion the velocity continuously changes", because speed usually refers to the magnitude of the velocity and doesn't change in a uniform circular motion.

For this question, the answer is the direction of body's movement. The direction of the velocity continuously changes, while the magnitude of the velocity remains unchanged.