what is needed to start an object vibrating to make sound
energy
Sources of heat such as coal, oil, and natural gas that cannot be easily reproduced.
fossil fuels
potential energy like a rock rolling down a hill
kinetic energy
prepositions that give clues about where an object is - like above, below, left and right
position
the number of times a sound source vibrates in one second -
pitch
frequency determines the highness or lowness of a sound called
pitch
the way light bends when passing through a lense
refract
what is the tendency of an object to stay at rest or to stay in motion
inertia
the amount of force used to move something is called the
effort force
what is the energy of motion
mechanical energy
what is a slanted surface
inclined planeĀ
what is a wheel with teeth
gear
what is an inclined plane twisted into a spiral
screw
A lever is a barĀ that can turn or pivot on a fixed point is called a
fulcrum
Two inclined planes back to back make a
wedge
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
The transfer of energy by the flow of liquids and gases