Work and Energy

Work and Energy

An individual goes to his workplace by walk, sits down at his desk from 10 a.m to 5 p.m does his work and at the end of the day returns to his home by walking. Is that so that work is done conferring to physics? He actually does no work as sitting in his office as it involves no displacement. He does work only for the duration of his walk to his office and back to home. This is what Physics states!
Work is believed to be done by a force when an object experiences displacement parallel to the line of action of the force. It’s an activity that includes force and movement in the direction of force. The capability for doing work is what the energy is! Let’s learn more about this.

Principle of Work and Energy

The work-energy principle says that the change in kinetic energy of a body is equivalent to the net work done on the body. This information is referred to as work-energy principle and is derivable from the conservation of energy.

Here K.Eis final kinetic energy and K.Ei is initial kinetic energy.

Work and Energy Equations

It is the resultant of the force applied (F) and the amount of displacement (d) and is articulated by equation

W = F.d

Power describes the rate at which work is done. It is articulated as

The energy or work is articulated in Newton-meter (Nm) or Joules or kgm2/s2 . 1 Joule is defined as the amount of heat released when a force of 1 newton acts over one meter of distance.

Work vs. Energy

Work refers to overpowering resistance by the application of force. It is evident that the resistance has been overpowered from the movement of application of force. Energy is the capability to do work or perform some action and can be thought of something that is possessed or stored. It exists in several forms like light, heat, electrical, potential energy or other forms.Work and energy have similar units and are closely related. Energy can be put in storage, but that cannot be done for work.  Work is energy in motion. Energy alters from one form to another by the process of doing work.

Usually, there are two sorts of work Positive and negative work. If the direction of the force is in the same direction as the motion of its spot of application, work done is said to be positive.If the course of the force is in the opposite direction to the motion of its point of application, negative work is said to be done.


Practise This Question

Which of the following statements is/are true?