Final answer:
The subject of this question is Tension Forces, which are important in a mechanical system consisting of masses and strings. Tension forces help maintain equilibrium and can be observed in various situations.
Step-by-step explanation:
The subject of this question is Tension Forces.
When a mass on a tabletop is attached by a string to a hanging mass, the tension force in the string is an important factor. The tension force is equal to the weight of the hanging mass and helps maintain the equilibrium of the system.
Examples of tension forces can be seen in various situations, such as a person pulling on a rope, a string holding a weight, or a wire supporting a hanging object.