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Work and Energy
Work
Work is defined as a force acting upon an object to cause a displacement.
W = F * S
SI Unit - Joule(J)
Sub Topic
Work is a scalar quantity
Work done can be positive, negative or zero
Positive Work
When force acts in the same direction as that of displacement(Angle between F and S is 0 degree)
Negative Work
When force acts opposite to the direction of displacement(Angle between F and S is 180 degree)
Zero Work
When force acts perpendicular to displacement(Angle between F and S is 90 degree)
Work is also said to be zero if the force is not able to produce any displacement (S = 0)
Energy
The commercial unit of energy is kWh
The energy of a body is its capacity of doing work.
Types of Energy:
Mechanical Energy
Kinetic Energy
Energy of an object by virtue of its motion
K.E = 1/2 mv^2
Potential Energy
Energy of an object by virtue of its position
P.E = mgh
Light Energy
Heat Energy
Sound Energy
Power
SI Unit - Watt(W)
Power is the rate of doing work or work done in unit time.
Bigger unit of power is kW
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