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sound is carried by
energy
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what is needed to start an object vibrating to make sound
energy
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Sources of heat such as coal, oil, and natural gas that cannot be easily reproduced.
fossil fuels
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potential energy like a rock rolling down a hill
kinetic energy
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prepositions that give clues about where an object is - like above, below, left and right
position
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the number of times a sound source vibrates in one second -
pitch
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frequency determines the highness or lowness of a sound called
pitch
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the way light bends when passing through a lense
refract
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what is the tendency of an object to stay at rest or to stay in motion
inertia
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the amount of force used to move something is called the
effort force
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what is the energy of motion
mechanical energy
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what is a slanted surface
inclined plane
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what is a wheel with teeth
gear
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what is an inclined plane twisted into a spiral
screw
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A lever is a bar that can turn or pivot on a fixed point is called a
fulcrum
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Two inclined planes back to back make a
wedge
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what is a simple machine that is not attached to anything, but it increases the force to moave an object yet it does not change the direction of the force
movable pulley
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The transfer of energy by the flow of liquids and gases
convection
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You can save time and energy by using
machines
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When light strikes a surface and bounces off
reflection
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The transfer of heat through space
radiation
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