Running in circles
A jogger runs around a circular track of 30 m radius shown in the figure at the right. She runs at a constant speed in a clockwise direction and completes one lap in 40 seconds.
- Compare the directions and magnitudes of
- her instantaneous velocity at A,
- her instantaneous velocity at C, and
- her average velocity going from A to C.
- If the runner completes exactly one lap what is her average speed? her average velocity? Explain your answer.
- Is the magnitude of her average velocity from A to B bigger, smaller or equal to the magnitude of her average velocity from A to C? Explain your reasoning.
- For this example, which do you think is more relevant: average speed or average velocity? For whichever one you chose can you think of an example in which the other one is more relevant or interesting?
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Page last modified
August 31, 2004: K06