physics portfolio

Work and Energy
Work
Energy
Power
SI Unit - Joule(J)
SI Unit - Joule(J)
SI Unit - Watt(W)
Work is defined as a force acting upon an object to cause a displacement.
W = F * S
The energy of a body is its capacity of doing work.
Power is the rate of doing work or work done in unit time.
Types of Energy:
Mechanical Energy
Light Energy
Heat Energy
Sound Energy
Kinetic Energy
Potential Energy
K.E = 1/2 mv^2
P.E = mgh
Bigger unit of power is kW
The commercial unit of energy is kWh
Energy of an object by virtue of its motion
Energy of an object by virtue of its position
Work done can be positive, negative or zero
Work is a scalar quantity
Positive Work
Negative Work
Zero Work
When force acts in the same direction as that of displacement(Angle between F and S is 0 degree)
When force acts opposite to the direction of displacement(Angle between F and S is 180 degree)
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)
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