Chapter 10, Problem 41A

Interpretation Introduction

Interpretation: The reason for ball to not spontaneously roll up a hill needs to be explained using the first law of thermodynamics.

Concept Introduction: The first law of thermodynamics states that the heat is a form of energy, which is subjected to principle of conservation of energy. Therefore, the heat is neither destroyed nor created.

Explanation of Solution

A ball doesn’t spontaneously roll up a hill because the first law of thermodynamics says that the energy is conserved and it can change from one form to another. The kinetic energy of falling object is not restricted for becoming potential energy. It does not set up any limits on how the change will occur. Moreover, a ball cannot move opposite to the gravity until and unless any external force in applied on it.