25 terms

# simple machines

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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
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.