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Q3.6 An object moves at a constant speed in a clockwise direction around an oval track. The geometrical center of the track is at point O. When the object is at point P, which arrow shows the direction of the objects acceleration vector? #2 #1 #3 A. #1 (directly away from O) B. #2 (perpendicular to the track) C. #3 (in the direction of motion) D. #4 (directly toward O) E. #5 (perpendicular to the track) #4 #5 Oval trackHow do you get the answer, which is E?

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Answer #1

The object is moving with constant speed, therefore there is only centripetal acceleration associated with it. Now, the centripetal acceleration vector is always perpendicular to the velocity vector.

The velocity vector at the given point is tangent direction #3, therefore, centripetal acceleration must be perpendicular to it, i.e. #5

Answer (E)

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