The person transfers Energy to the rope by pulling it up and down at point A. This is because energy should be transferred to an object to move it.
Work-Energy Theorem
According to the work-energy theorem, the change in the kinetic energy is equal to the amount of work done.
- Energy is the ability to do work
- Energy should be applied to an object to move it in a direction
- The amount of energy transferred by a force is called Work
- Thus, the relation between work and energy is direct.
- That is, the difference in the kinetic energy of an object is work done by an object
Explanation of the theorem for the given condition
Here, the person is pulling the rope up and down at point A. As the person is applying energy to the rope, it is moving in up and down in directions. So, it causes a difference in the kinetic energy of the rope at point A and point D.
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