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Level 60

Work, Energy & Power


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work
a force acting upon an object to cause a displacement. (key words: force, displacement, and cause)
Work formula
Work = force × distance
Joule (J)
SI unit Work and Energy
Energy
(physics) the capacity of a physical system to do work
Examples of different energies
Potential, kinetic, heat, light, sound, electrical, magnetic, solar, nuclear
Potential Energy
(mass) x (g) x (height)
Examples of potential energy
Coiled spring, water in a dam, stretched rubber band etc
kinetic energy
a running dog
Examples of kinetic energy
Moving car, stone falling, wind, tide etc.
Chemical energy
Potential energy stored in chemical bonds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by product.
Example of chemical energy
Energy stored in food and fossil fuels
sound energy
a clap of thunder
electrical energy
a power line
Example of magnetic energy
Cranes, door locks of cars
Solar energy
Energy we get from the sun
Nuclear energy
fusion or fission
Principle of conservation of energy
Energy cannot be created or destroyed, but may be converted from one form to another
Renewable energy
Energy that does not run out.
Examples of renewable energy
Solar, wind, tidal, hydro-electric, geothermal, biomass
Non-renewable sources of energy
Fossil fuels such as coal, oil, gas, turf
Biomass
Energy generated from crops, plant waste and wood
Geothermal energy
Energy generated from heat below the plant's surface
Power
(physics) the rate of doing work
Watt
A measure of power equal to one joule of work per second.
force
(interactions between two objects)
Newton
(kg*m)/(s*s)
Joule
SI unit used to measure energy
Spring Constant
A parameter that is a measure of a spring's resistance to being compressed or stretched.
Kilowatt-hour (kwh)
3.6 million Joules
Gravitational energy
The potential energy from an object's height
elastic energy
a mousetrap is an example of what type of energy?