When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
Correct answer: C. The tension in the string
- A. Mass of a body
- B. Velocity of body
- C. The tension in the string
- D. Centripetal acceleration
Explanation
In horizontal circular motion, the inward force required for centripetal acceleration is supplied by the string's tension. The mass and velocity affect the required value, but neither supplies the force itself. The likely mistake is choosing centripetal acceleration, which is the resulting acceleration rather than a force.
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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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