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QPage 60: Q4: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 60: Q4 Solution: A force is applied on a block of mass . The block is displaced…

A force FF is applied on a block of mass MM. The block is displaced through a distance dd in the direction of the force. What is the work done by the force on the block? Does the internal energy change because of this work?

Step-by-Step Verified Solution

**Answer:** Work done by the force on the block = FdFd. Internal energy does not change due to this work. **Step-by-Step Explanation:** Work done by the force W=F⋅d=Fdcos⁡0�=FdW = F \cdot d = Fd\cos 0� = Fd. This work increases the **kinetic energy** of the block as a whole (macroscopic motion), not the **internal energy**. Internal energy refers to the random motion of molecules, which is unaffected by the bulk motion of the block [citation:8][citation:10].

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