Physics Assignment Help >> Work, Power and Energy, Energy Conservation
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Theory of Work, Power and Energy
Work is defined by the dot product of force and displacement
Where F = force active on a point, S = Displacement and
Power is defined by the rate at which work is done.
Energy is defined as capacity to do work. There are two types of mechanical energy
a. Kinetic Energy
b. Potential Energy
Kinetic Energy: It is defined as energy possessed by a body by its motion. If mass of body is m and speed is v then kinetic energy
K.E. = 1/2 mv2
Potential Energy is defined as the energy possessed by the body by its position and strain.
It can be defined for conservative force field only. In case of uniform gravity, potential energy is mgh m m=mass of body
h= height from reference level
Unit and Dimensions
Energy and work have same units. Power is measured at the rate at which work is done.
Work, Power, Energy, Unit and Dimensions, Conversation between different systems of units, Potential Energy, Kinetic Energy, Work Kinetic Energy Theorem, Conservation of Energy, Motion in a Vertical Circle, Critical Velocity, Collisions, Elastic Collision, Inelastic Collision, Concept of Coefficient of restitution