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Energy in Physics (FORMS of energy (Chemical energy (including the food…
Energy in Physics
FORMS of energy
Mechanical energy
energy of movement
the energy used to displace a body or to change the position of the body or to deform the body
Potential energy
the energy possessed by a body by virtue of its position or due to state of strain
Gravitational energy
free-fall (e.g.)
Elastic energy
change the shape of a body
Kinetic energy
energy increases with speed
Thermal energy
cold & hot energy
new unit: calorie
amount of heat energy needed to raise temperature of 1g of water by 1℃
Chemical energy
energy of chemical reaction
including the food every day you eat
or the energy a bar of coal has
Nuclear energy
stored in an atom such as U or Pu
fusion & fission
Light energy
the form of electromagnetic radiation
Sound energy
associated with vibration of matter
It’s a type of waves
need an object to travel through.
like water or air
Electrical energy
caused by moving electric ions
so, somehow, it's a kind of
conservation of energy
Energy can't be destroyed
Energy can't be created
What is energy?
Energy is the capacity of doing work
What's its unit?
J--joule
other units
kJ--kilo joule
SI unit:
