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43 Cards in this Set
- Front
- Back
energy
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the ability to do work or cause change
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kinetic energy
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the energy of motion
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kinetos
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"moving" -Greek word
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potential energy
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energy that is stored and held in readiness
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elastic potential energy
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potential energy associated with objects that can be stretched or compressed
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gravitational potential energy
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potential energy that depends on height
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mechanical energy
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the energy associated with the motion or position of an object
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thermal energy
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total energy of the particles in an object
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chemical energy
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potential energy stored in chemical bonds that hole chemical compounds together
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electrical energy
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the energy that moving electric charges produce and carry
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electromagnetic energy
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energy that travels in waves that have some electrical and some magnetic properties
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nuclear energy
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potential energy stored in the nucleus of an atom and is released during nuclear reactions
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nuclear fission
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nuclear reaction when a nuceus splits
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nucear fusion
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nuclear reaction when nuclei fuse
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energy conversion
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a change from one form of energy to another.
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law of conservation of energy
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states that when one form of energy is converted to another, no energy is destroyed in the process
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joule
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the amount of work you do when you exert a force of 1N to make an object move a distance of 1Meter
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what is the S.I unit of measurement for energy?
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joule(J)
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1 joule=
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1newton-meter
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1newton=
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1kg-1m2/sec2
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therefore, 1J=
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1kg-m2s2
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work
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the transfer of energy that results from applying a force over a distance
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for work to be done, the object must......
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move in the same direction as the force
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what is the formula for work?
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w=f x d
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how much kinetic energy an object has depends on 2 things....
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1. mass of the object
2. the speed it is moving at |
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the more speed, the more kinetic energy (direct proportion?)
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not a direct proportion
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the more mass, the more kinetic energy (direct proportion?)
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direct proportion
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what is the formula to find kinetic energy?
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mass x velocity2
--------------------- 2 |
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if you go twice as fast when finding kinetic energy, what happens?
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the energy increases by 4times
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what is the formula for finding GPE when the mass is in kg?
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Ep=m x acceleration due to gravity x height
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what is the formula for finding GPE when the mass is in newtons?
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Ep=m x h
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what is the formula for efficiency?
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Eff= W(out)
---------- W(in) x 100 |
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what do imperfect machines lose some input work to?
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friction
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what is efficiency?
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the ratio of work output to work input
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all matter is made up of small particles, called ______&_______
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atoms&molecules
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when the thermal energy of an object _____, its particles move faster, making the ____ of the object rise.
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increases, heat
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chemical energy is stored in ____&____
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foods&matches
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You rely on electrical energy from _________ or _____ _____ to run electrical devices such as radios, lights, and computers
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batteries&power lines
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electromagnetic energy travels in ________
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waves
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these electromagnetic energy waves have some _____ properties and some ______ properties
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electriac & magnetic
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i addition to visible light, ___,_______,&_________ are all examples of electromagnetic energy
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ultraviolet radiation, microwaves, and infared radiation
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nuclear power plants use _______ reactions to produce electricity
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fission
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nuclear ______ occurs in the suna and other stars
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fusion
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