Circular motion

If speed = distance/time and distance is the circumference of the circle, which horse (#1 - #4 or left - right) would be travelling fastest?

• #1

• #4

• #2

• #3

What is rotational speed measured in?

• rpm

• km/h

• mph

A vinyl record like this one has the same rotational speed at all points.

• False

• True

Find the equation in your formula sheet that relates radius, speed and centripetal acceleration.

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Why could a rotating object with constant speed still have an acceleration?

• Because it is speeding up.

• Because it is speeding up and slowing down.

• Because its direction is changing.

• Because it is slowing down.

Answer this question by research, thought or even your own personal experiment. What path will the marble follow? Justify your answer.

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