Chapter 2, Problem 28A

Faina says that an object cannot be in mechanical equilibrium when only a single force acts on it. Do you agree or disagree?

To determine

Whether F is correct in saying that an object cannot be in mechanical equilibrium when only a single force acts on it, or not.

Answer to Problem 28A

F is correct.

Explanation of Solution

Introduction:

Equilibrium is basically a state of no change in the state of the object. Thus, if the object is in equilibrium, then the net force on it is zero, that is,

  ${\displaystyle \sum F}=0$

Considering the above formula, when the object is in mechanical equilibrium, then the net force on it has to be zero which would not be possible ifthere is only a single force acting on it.

Conclusion:

Hence, F is correct in saying that an object would not be in mechanical equilibrium if there is only a single force acting on it.