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ENERGY
IGCSE PHYSICS
By-Tanmaye Gupta
What is Energy?
Energy is the capacity to do work.
The S.I. unit of energy is Joules
1Joule = 107 erg
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Other units of Energy.
1Wh = 3600J = 3.6 kJ
Where W= watt
k= kilo
h= hour
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Potential Energy
The amount of energy stored in a body when it is stationary.
P.E = mgh
Where , m = mass (kg)
g = gravity
h = height
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Kinetic Energy
Kinetic energy is the energy possessed by a body when it is in
motion.
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Kinetic Energy Numericals
1. What is the kinetic energy of a jogger with a mass of 65.0 kg
traveling at a speed of 2.5 m/s?
Mass = 65.0 kg
Velocity = 2.5m/s
Kinetic Energy = 0.5*m*v2
= 0.5*65*2.5
= 203.125 J
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Potential Energy
1. Find the gravitational potential energy of a light that has a
mass of 13.0 kg and is 4.8 m above the ground.
Mass = 13.0kg
Gravitational pull = 9.8
Height = 4.8 m
Potential Energy = mgh
= 13.0*9.8*4.8
= 611.52 J
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Bibliography
Physics World
http://ap-physics.david-s.org/
THANKS FOR WATCHING
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