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20 Cards in this Set
- Front
- Back
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contact force |
a force that requires two pieces of matter to touch |
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friction |
the force that results when two materials rub against each other or when their contact prevents sliding
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non-contact force |
a force that acts at a distance
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gravity |
the force of attraction between any two objects because of their mass
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acceleration |
the rate at which the speed or direction of motion of an object changes over time
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light energy
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energy that travels in straight lines and can move through empty space
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opaque
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materials that do not let any light pass through (wood, metal, etc.)
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translucent
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materials that let some light pass through, but not all (wax paper, lampshades)
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transparent
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materials that let almost all light pass through (clear glass, clean air)
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reflection
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when light bounces off an object or surface (like on mirrors and other shiny, smooth, materials)
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refraction
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the bending of light when it passes through through transparent prisms or lenses (rainbow, microscope)
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mechanical energy |
energy of an object or system due to its motion or position
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kinetic energy
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energy of an object or system due to its motion |
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potential energy |
energy of an object or system due to its position
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electrical energy |
energy stored in electrically charged particles |
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series circuit |
one complete path of electric current (energy source, conductor, resistor)
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electric current |
the flow of electricity through a conductor |
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parallel circuit |
more than one complete path
of electric current an energy (energy source, conductor, resistor) |
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thermal energy |
energy that heats particles |
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sound energy |
energy that travels through vibrations (drums, bells) |
