Question

Name two conditions required to do work.

Answer 1

Here we are going to discuss the conditions that are required to do work. Work is defined as the measure of energy transfer when a body is subjected to an external force and moves from its initial position to another position.

Complete step by step answer:
Let us first find out what work is. Then we will discuss the necessary conditions that are required to do work.
Work is defined as the measure of the energy transferred when a body moves from its initial position due to the action on an external force. If the force which acts is constant, work is calculated by multiplying the length of the path by the component of the force acting along the path.
Mathematically we get, the work $W$ is equal to the force $F$ times the distance $d$
Thus, we get, $W = F.d$
So, it is clear from the formula that work depends on the two conditions namely:
(i) Force: If the force does not act on a body then it will not move and the magnitude of the force will be $0$ and hence work will be $0$.
(ii) Displacement: If a body does not displace from its position then the magnitude of displacement will be $0$. Hence, work will be $0$.

Note: It must be noted that if the force is being exerted at an angle $\theta$ to the displacement, the work done is $W = F.d.\cos \theta$. Work is a vector quantity which has both magnitude and direction. If the force acts at angle ${90^ \circ }$ to the direction of displacement then the work will be again $0$.