Which one among the following happens when a swing rises to a certain height from its rest position?a)Its potential energy decreases while kinetic energy increasesb)Its kinetic energy decreases while potential energy increasesc)Both potential and kinetic energy decreased)Both potential and kinetic energy increaseCorrect answer is option 'B'. Can you explain this answer?

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Answer

Answer:
When a swing rises to a certain height from its rest position, there are changes in both its potential energy and kinetic energy. However, the dominant change is that the swing's kinetic energy decreases while its potential energy increases. This can be explained in detail as follows:

1. Initial position:
At the rest position of the swing, it possesses potential energy but no kinetic energy. The potential energy is at its maximum, as the height from the ground is at its highest point.

2. Rising motion:
As the swing starts to rise, it gains kinetic energy while simultaneously losing potential energy. The potential energy decreases because the swing is moving away from its highest point, thus reducing the height from the ground. At the same time, the swing gains kinetic energy due to its motion.

3. Maximum height:
When the swing reaches its maximum height, it momentarily comes to a stop. At this point, its kinetic energy becomes zero as the swing is not in motion. However, its potential energy is at its maximum as the height from the ground is at its highest point.

4. Falling motion:
As the swing starts to fall back down, it loses potential energy while gaining kinetic energy. The potential energy decreases as the height from the ground decreases. Simultaneously, the swing gains kinetic energy due to its motion.

5. Rest position:
When the swing returns to its rest position, its potential energy becomes zero, as the height from the ground is zero. At the same time, its kinetic energy is at its maximum, as the swing is moving at its fastest.

Conclusion:
In summary, when a swing rises to a certain height from its rest position, its kinetic energy decreases while its potential energy increases. This is because the swing loses potential energy as it moves away from its highest point and gains kinetic energy due to its motion.

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