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Energy and Density (STORED (Chemical potential (food, fuel), radiation…
Energy and Density
STORED
Chemical potential
food
fuel
Gravitational potential
Elastic potential
Kinetic energy
radiation
nuclear energy
Energy a system or object can have
TRANSFERED
thermal energy
Sound energy
Electrical energy
Light energy
Energy moving from one place to another
Power
The rate of energy transfer. The amount of energy transferred per unit time
Power= Energy transferred/time
Power is measured in watts
1w of power means 1J of energy transferred in one second
1w=1J/s
Density
a measure of how closely packed the atoms in matter are
Irregular objects
Water displacement
When you put an object into a measured amount of water and measure the difference
The volume of water displacement is equal to the volume of the object
Efficiency
E=Useful output /Total imput energy
A light bulb
energy transfered 100J
light 20J
Thermal energy 80J
Potential energy
When the state changes
Kinetic energy
When the temperature changes
Density = mass/ volume
Internal energy= potential and kinetic energy added together from all particles