simple machines

Terms	Definitions
pulley
inclined plane
lever
gears
wheel and axle
wedge
screw
gravity	force that pulls 2 things together
force	push or pull
inertia	causes objects at rest to remain at rest and objects in motion to remain in motion
energy	the ability to do work
work	when force is used to move an object, only occurs when something moves
load	object being lifted or moved
effort force	amount of force needed to move something
simple machines	one of six objects that help you do work includes levers, pulleys, wheels and axles, inclined planes, wedge, screw, and gears
efficiency	the amount of useful work a machine puts out compared to the amount of work that is put in
friction	the force that acts against objects in motion when one surface touches another
speed	the distance traveled in a certain amount of time
pulley	can be fixed or moveable, can change the direction of force or decrease the effort force, the more you use the less force you need.
inclined plane	allows you to push or pull instead of lift, a ramp is an example.
lever	consists of 2 parts a bar and fulcrum, there are 3 types, makes it easier to lift things.
gears	can work with a wheel and axle, larger ones are easier to turn, can change the direction and amount of force
wheel and axle	has 2 parts, one part is a bar that passes through the other part, the bar turns a small force into a larger force
wedge	pushes things apart by changing the direction of the force
screw	a spiral inclined plane that increase force to move deep inside something.

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