Question

A box of 10 Kg is placed on a horizontal surface and is moved 2 meters horizontally.find the work done by the gravitational force and Justify your answer (g=10m/s^2)

Answer 1

Answer:

From Secondary Class' view,

We know that if Force acting is perpendicular to the displacement, then the work done is zero. Now, gravitational force i.e. gravity acts perpendicularly towards centre of the Earth. Hence, work done is zero

From High School's View,

We know that

$work \: done \: = force \times displacement \times \cos( \alpha )$

where Alpha is the angle between force and displacement

Putting in the values, work done = 0

For Physics' Lovers,

There is no component of Gravitational force (between earth and the box) acting in the direction of displacement. Hence, work done is 0