Work is done when a force produces motion. The wirk done by a force on a body depens on magnitude of the force(F) and distance through which the body moves(S).
W = F × S.
The unit of work is 'Newton metre' which is return as Nm, it is also known as 'Joule'
Power is defined as the rate of doing work.
Power= Work done / Time Taken.
Being a fraction of two scalar quantities, work and time, power is a scalar quantity. The usnitof power is "joules per second". And the SI unit of power is watt and it is the rate of doing work at 1 joule per second.
Energy is the ability to do work. The amount of energy possessed by a body is equal to the amount of work it can do when its energy is realesed.The SI unit of energy is joule and energy is a scalar quantity. energy is of two types:
- Kinetic Energy
- Potential Energy
The energy of a body that originates due to its motion is called kinetic energy. Kinetic energy = F × S and also Kinetic energy=(mv2)/2
The energy of a body due to its position or change in shape is known as potential energy.
P.E = mgh, where m = mass of the body, g = acceleration due to gravity, h = height of the body above a reference point. The sum of potential energy and kinetic energy is known as mechanical energy.
Law of Conservation of Energy
Energy can neither be created nor be destroyed it can be converted to one form to another form. eg: When a body fall from a body then the potential energy(p.e) is gradually converted to the kinetic energy(k.e) and after that again K.E is converted in P.E when body reach the ground(stationary position)