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Energy (Calculating GPE (g = acceleration due to gravity (m/s/s) (9.8…
Energy
Calculating GPE
GPE=mgh
GPE = gravitational potential energy (Joules)
m = mass (kg)
g = acceleration due to gravity (m/s/s)
9.8 m/s/s
h = height above surface (m)
Calculating KE
KE = 1/2 mv2
KE = kinetic energy (Joules)
m = mass (kg)
v = velocity (m/s)
Conversions from KE to PE
total potential and kinetic energy in a system
mechanical energy = KE + PE
can transfer back and forth put the total doesn't change
Kinetic Energy
energy of motion
depends on
mass
velocity
Potential Energy
stored energy due to position
3 types
elastic
springs or rubber bands
chemical
food and fuel
gravitational
position avove Earth
Changing forms of energy
many devices convert energy from one form to another
Example:
Burning fuel in engine
kinetic energy of the car
Radiant Energy
chemical energy in a plant
eat the plant
energy you use
What is Energy
ability to cause change
different forms
Electrical
chemical
thermal
radiant
Law of Conservation of Energy
states that energy cannot be created or destroyed
friction and air resistance
cause mechanical energy into thermal energy
total still stays the same
Converting Mass into Energy
Fusion
happens in all stars including the Sun
Human Body