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Found in: Page 163

### An Introduction to Thermal Physics

Book edition 1st
Author(s) Daniel V. Schroeder
Pages 356 pages
ISBN 9780201380279

# Imagine that you drop a brick on the ground and it lands with a thud. Apparently the energy of this system tends to spontaneously decrease. Explain why.

The energy is transferred from the brick to the ground, so the energy of the system tends to spontaneously decrease.

See the step by step solution

## Given

A brick is dropped to the ground and it lands with a thud.

Energy of this system tends to spontaneously decrease, explain why?

## Explanation

Helmholtz free energy can be determined by
F=U-T SWhere, F= Helmholtz free energy, U=Internal energy,T=absolute temperature of the system and S=entropy of the system.The total energy of the brick = kinetic energy + potential energy

From the law of energy conservation this is always constant.

When the brick hits the ground, its kinetic energy is zero, but the potential energy remains the same. The kinetic energy is redistributed into the thermal energy of the molecules of the brick and to the ground where the brick hits.

So a part of the energy is transferred from the brick to the ground.

Therefore the energy of the system tends to spontaneously decrease.

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