Uniform Circular Motion

  • #1
265
0
I had a test today, there was a question about uniform circular motion. Isn't the velocity constant since the speed is constant? I know angular velocity is constant, but the question's answers only state constant speed or velocity.

Thank you.

Stephen
 

Answers and Replies

  • #2
Velocity is a vector. Speed is a scalar (the magnitude of the velocity). If the direction of motion changes, the velocity changes, even if the speed is constant.
 
  • #3
286
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Yes the velocity is constant since the speed is constant, but only for tangential speed, you are forgetting the centripetal component of circular motion. As phlogistonian stated velocity is a vector i.e... speed and direction, a change in both or either will cause an acceleration.
 

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