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Chapter 1: Q6DQ (page 228)

Is it possible for a friction force to increase the mechanical energy of a system? If so, give examples.

Short Answer

Expert verified

Yes,the frictional force can increase the mechanical energy of a system.

Step by step solution

01

Concept/Significance of Law of Conservation of Energy 

This law tells that the total energy is the sum of kinetic energy and the potential of an isolated system remainsthe same.

02

Explain whether a friction force can increase the mechanical energy of a system with an example

Yes, the frictional force can increase the mechanical energy of a system.

For example, if a box is dropped horizontally on the conveyor belt, then there will two works are done on the block. One is because of friction force during the motion of the belt and the other is because of friction in the box motion on the belt after the projection.

So, the work done is positive and the final mechanical energy will be greater than that of the initial mechanical energy. Thus, the mechanical energy would be increased by the friction force

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