Question

What are some examples of work?

Answer 1

We use terms like overworked and hard workers to explain the trouble put by an individual. But what's the meaning of work and the way can we quantify it? The scientific definition of work is different in some ways from its everyday meaning. The definition of work in physics reveals its relationship to energy – whenever work is completed, energy is transferred.

Complete step by step answer:
An object is horizontally dragged across the surface by a 100 N force acting parallel to the surface. Find out the amount of work done by the force in moving the object through a distance of 8 m
We know that,
$F=100N$
$d=8\text{ m}$
Since F and d are in the same direction,
$\theta =0$, [$\theta$ is the angle of the force to the direction of movement]
$W=F.d\cos \theta$
$W=100\times 8\times \cos (0)$
= 800 J [Since $\operatorname{Cos}(0)=1$]
This means we need to do 800 Joules of work to move the object through a distance of 8 meters.
There are some other examples of work such as moving a charge from infinity to a finite distance such that it comes in the influence of a field.
Pushing and pulling something such that there is a displacement is also a form of doing work.

Note: There are several factors affecting the work done but the two major factors are Force applied and Displacement. If there is no force this means no work is done and if there is no displacement then also no work is done. For a piece to be done, in a very scientific sense, a force must be exerted and there must be displacement within the direction of the force.