An object moving in a circle is tied to a string. What happens when the string is cut?
Correct answer: B. It flies off along a tangent
- A. It continues moving in a circle
- B. It flies off along a tangent
- C. It falls straight down
- D. None of these options is correct
Explanation
When the string breaks, the centripetal force stops to act. Due to inertia, the stone continues to move along the tangent to circular path.
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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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