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Energy (Examples (Potential Energy (Gravitational Potential Energy…
Energy
Definition
Capacity to do work
S.I. unit
joule(J)
Examples
Potential Energy
Chemical Potential Energy
Energy stored in substances due to the position of the atoms or electrons in the substance
Examples
Fossil Fuels
Batteries
Food
Gravitational Potential Energy
Energy stored in a body due to its height from the ground
Formulae
GPE=mgh
m=mass of body
g=gravitational field strength
h=height from the ground
Elastical Potential Energy
Energy stored in a body due to its
elastic deformation
Rubber bands and springs contain E.P.E
Thermal Energy
Nuclear Energy
Electrical Energy
Light
Kinetic energy
energy of a body due to its motion
Examples
rolling soccer ball
sea waves
Frisbee
Formulae
K.E=1/2 mv^2
k=kinetic energy(J)
m=mass of body
v=speed of the body
Priniciple of conservation of energy
It states that energy cannot be created or destroyed, but can be converted from one form to another. The total energy would remain the same
Examples
Hammering a nail
Burning of fossil fuels
Efficiency
(useful energy output/total energy output)x100%
Work done
the product of the force and the distance moved by the object in the direction of the force
WD=F x d(direction of force)
S.I unit
joules(J)
Power
Definition
defined as the rate of work done
Formulae
P= work down/time
T=time(s)
WD=work done(J)
P=power(W)