Computer scored Unit Test XAS
Question 19 of 25
2 Points
The picture below shows a person swinging a toy plane attached to a string in
uniform circular motion.
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1
Which vector points in the direction of the centripetal acceleration of the
plane?
O A. B
O B. C
O CD
O DA
PREVIOUS

ITS B

Explanation:

The direction of velocity is perpendicular to the direction of the position and tangent to the circular orbit. Direction of velocity is constantly changing. When an object moves in a circular orbit, the direction of the velocity changes and the speed may change as well.

The direction of velocity changes at every point in a circular motion. The tangent at any point gives the direction of velocity at that point, where as acceleration is always directed towards the recent in a uniform circular motion.

nasa 3