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Which one among the following happens when a swing rises to a certain

June 1, 2025 by rawan239

Which one among the following happens when a swing rises to a certain height from its rest position ?

Its potential energy decreases while kinetic energy increases

Its kinetic energy decreases while potential energy increases

Both potential and kinetic energy decrease

Both potential and kinetic energy increase

This question was previously asked in

UPSC NDA-1 – 2015

Download PDF Attempt Online

The correct answer is Its kinetic energy decreases while potential energy increases. This describes the energy transformation as an object moves against gravity and slows down.

At the rest position (lowest point), the swing has its maximum speed and thus maximum kinetic energy (assuming negligible energy loss). As it rises, its height above the lowest point increases, causing its gravitational potential energy (PE = mgh) to increase. Simultaneously, the swing slows down as it moves upwards against gravity, causing its kinetic energy (KE = 1/2 mv^2) to decrease.

According to the principle of conservation of mechanical energy (in the absence of friction and air resistance), the total mechanical energy (sum of potential and kinetic energy) remains constant. Thus, any decrease in kinetic energy is compensated by an equal increase in potential energy, and vice versa.

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