For a book of mass m, moving a distance d on a smooth horizontal table, the work done due gravitational force is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 0.
The work done by a force is calculated as the product of the force and the displacement in the direction of the force. In the case of a book of mass 'm' sliding on a smooth horizontal table, the gravitational force acts vertically downwards, perpendicular to the book's horizontal displacement 'd'. Since the force and the displacement are at a 90-degree angle, the component of the gravitational force in the direction of motion is zero. Therefore, according to the work formula W=Fdcosθ, where θ=90∘, the work done by the gravitational force is zero.