Question

What are some examples of work?

Answer 1

Work

1. The amount of the force multiplied by the actual distance traveled by the item throughout the direction of the exerted or delivered force is known as work.
2. Work would be the transmission of energy well with the assistance of a force across such a specific distance in a unique way.
3. It is a scalar quantity.
4. Its S.I unit is joule and is represented by $J$.
5. The dimensional formula for work is the same as that of energy and is given as, $\left[{\mathrm{ML}}^2{\mathrm{T}}^{-2}\right]$.
6. Mathematically, work done can be expressed as,

$W=F·s\cos \theta$

Where, $F$ is the force applied, $\theta$ is the angle between the displacement vector and the force vector, and, $s$ is the displacement.

The following types of work done that is as follows:

1. Positive work
2. Negative work
3. Zero work

Some examples of work are given as follows:

1. The object falling to the ground is falling in the direction of gravity. The work done is considered to be positive work done since gravity acts downwards in the direction of the falling object.
2. Work done by the gravity on a rocket going perpendicular upwards is an example of negative work.
3. The applied force will not create any displacement if it is exerted strongly against the wall. As a result, there is no work done. This is an example of zero work done.
4. Consider a weightlifter who raises a 25-kg barbell and moves it 2 meters away from the ground as shown in the figure below. The work done on the barbell here is done against gravity.