Question

What is meant by positive work, negative work, and zero work? Illustrate your answer with an example?

Answer 1

Work:

1. Work is considered to be accomplished whenever a force applied to an item causes it to move.
2. Mathematically, work can be represented as:

$$\begin{gathered} \mathrm{W}=\mathrm{F}·\mathrm{S} \\ \mathrm{W}=\mathrm{FScos\theta } \end{gathered}$$

Here, W is the work, F is the force, S is the displacement, and $\mathrm{\theta }$ is the angle between the force and the displacement.

Positive work:

Whenever force, as well as displacement, are both throughout a relatively similar direction, this same work done on an item was said to have been positive work.

Example: Force, as well as displacement, interact in the forward direction of a body moving on a horizontal surface. Throughout this situation, the work is referred to as Positive work.

Negative work:

Negative work is done when the displacement is in the opposite orientation of the force delivered.

Example: The gravity on some kind of rocket moving vertically upwards was worked on.

Zero work:

Whenever force and displacement, are perpendicular to one another, or even when either force or displacement is zero.

Example: Whenever we walk with an object, force operates in the downward direction, but displacement acts in a forward manner.