The centripetal acceleration of an object moving along a circle of radius 'r' with an angular speed 'w' is given by the formula:
Correct answer: A. a= r W2
- A. a= r W2
- B. a= r W
- C. a = r² W
- D. a= r² W²
Explanation
Centripetal acceleration increases with radius and is also affected more significantly when angular speed increases, as it is squared.
This question appeared on the UHS MDCAT 2024 paper, which you can sit online with every answer explained.
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About Angular and Linear Quantities
Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
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