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34 Cards in this Set
- Front
- Back
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Ability to cause change
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Energy
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Energy is measured in
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Joules
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Kinetic Energy
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energy in the form of motion
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Law of conservation of energy
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energy cannot be created or destroyed.
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Potential energy
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energy that is stored
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GPE formula
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GPE(J)=MxGxH
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In a nuclear fusion reaction
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mass is transformed into energy.
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Lever
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bar that is free to pivot about a fixed point.
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how is mass converted into energy in nuclear fission?
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nuclei do not fuse, they are broken apart.
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Formula for KE
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KE=1/2MV^2
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Energy's different forms.
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Thermal,chemical,radiant, electrical
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Elastic potential energy
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energy stored by something that can stretch or compress
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chemical potential energy
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energy stored in chemical bonds
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Gravitational Potential Energy
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energy stored by objects due to their position above Earth's surface.
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Mechanical Energy
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total amount of potential and kinetic energy in a system:
ME=PE+KE |
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Work
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energy transferred when a force makes an object move.
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Formula for work
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W(J)=Fd
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power & formula
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amount of work done in one second
P(watts)=W/t |
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Power is the rate at which .......
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energy is transferred
P(watts)=E/t |
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machine
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device that makes doing work easier.
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Input force
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force applied to the machine
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Output force
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force applied by the machine
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Mechanical Advantage
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MA=Fout/Fin
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efficiency
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measure of how much of the work put into a machine is changed into useful output work by the machine.
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Efficiency formula
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Efficiency(%)=Wout/Win(100%)
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Simple Machine
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machine that does work with only one movement of the machine
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first-class lever
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fulcrum is located between the input and output forces.
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second-class lever
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output force is located between the input force and the fulcrum
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third class lever
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input force is applied between the output force and the fulcrum.
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pulley
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is a grooved wheel with rope,chain, or cable running a long the groove.
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wheel and axle
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simple machine consisting of a shaft or axle attached to the center of the larger wheel so that the wheel and axle rotate each other.
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inclined plane
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sloping surface, such as a ramp, that reduces the amount of force required to do work.
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screw
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inclined plane wrapped in a spiral around a cylindrical post
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Wedge
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inclined plane with one or two sloping sides.
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