Work, Energy and Power

Work-energy theorem, kinetic and potential energy, conservation of energy.

1.Introduction to Work, Energy and Power
A simple explanation of how work, energy and power help us understand what happens when objects move or forces act.
2.Work
Understand work as the transfer of energy when a force moves an object through a distance.
3.Positive and Negative Work
Learn how work can be positive, negative or zero based on the direction of force and motion.
4.Work Done by a Variable Force
Understand how work is calculated when the applied force changes with position.
5.Energy
Learn what energy means and how it is the ability of an object to do work.
6.Kinetic Energy
Simple explanation of kinetic energy as the energy of a moving object.
7.Potential Energy
Understand potential energy as stored energy due to an object's position or configuration.
8.Mechanical Energy
Learn how mechanical energy is the sum of kinetic and potential energy.
9.Conservation of Energy
Beginner-friendly explanation of how energy changes forms but the total amount remains constant.
10.Work-Energy Theorem
Understand how the work done on an object equals the change in its kinetic energy.
11.Power
Learn power as the rate at which work is done or energy is used.
12.Commercial Unit of Energy
Simple explanation of the kilowatt-hour (kWh), the unit used on electricity bills.
13.Law of Conservation of Mechanical Energy
Understand how the total mechanical energy stays constant when only conservative forces act.
14.Power and Efficiency
Learn how efficiency compares useful work output to energy input using simple examples.