Question

The capacity to do work is called:
$A.$ Energy
$B.$ Force
$C.$ Motion
$D.$ Speed

Answer 1

Hint:Here we will proceed by writing the formula of the capacity to do work that will help us to calculate the S.I unit of work and thus we can complete the asked statement.

Complete step-by-step answer:
As we know that capacity to do work is done when a force that is applied to an object moves that object. The capacity to do work is calculated by multiplying the force by the amount of movement of an object that is $W = F \times D$.
Where, w = work
F= force
D=distance
A force of 10 newtons, that moves an object $3$meters does 3 $n - m$ work.
Newton = $kg \times \dfrac{m}{{{s^2}}}$
If we multiply newton and meter it will become,
$kg \times \dfrac{{{m^2}}}{{{s^2}}}$
We know that,
Newton $ \times $ meter = Joule
  $kg \times \dfrac{{{m^2}}}{{{s^2}}}$
Therefore, 1 Joule = 1 Newton$ \times m$
So, we can say that work done by a force of 1 newton acting through one meter is equal to Joule. Joule is therefore the unit of work but Joule is also the standard unit of energy. This is because without energy within us or within an object, there will be no force to do work. For example, we have energy within us which is transferred into mechanical energy in order to complete our work, like moving a box or complete tasks like cooking.
In a nutshell, we can say that “Energy” is the “Capacity to do work”.
$\therefore $ The correct option will be A

Note – Whenever we come up with these type of problems where we have to complete the full statement of any quantity. Then we first write the formula to calculate the quantity and then after solving that we will get the S.I unit of that quantity. Once we will find the S.I then we can easily complete the asked statement.”The capacity to do work is called energy” .This is because without energy within us or within an object, there will be no force to do work. Potential energy is the amount of energy stored within an object or being to do work later on in the form of kinetic energy. For example, we have energy within us that is transformed into mechanical energy in order to complete our work, like moving a box or complex tasks like cooking.