Simple Machines/Force and Motion

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PLAY
screw
A simple machine made of a post with an inclined plane wrapped around it:
The threads on a jar and on the inside of the lid are both examples
Motion
A change in position of an object
position
The position of an object
balanced forces
Balance forces are two forces acting in opposite directions on an object, and equal in size
lever
A simple machine made of a bar that pivots on a fixed point
speed
The measure of the change in an object's position in a unit of time
simple machines
A machine with few or no moving parts that you apply just one force to: Ex: a wheelbarrow and a shovel
inclined plane
A simple machine that is a slanted surface
wheel and axle
A simple machine made of a wheel and an axle that turn together.
wedge
A simple machine made of two inclined planes placed back to back.
pulley
A simple machine that consists of a wheel with a line around it.
unbalanced forces
Forces of unequal strength; shown by objects that are moving
gravity
The force that pulls all objects toward the Earth
inertia
The property of matter that keeps an object at rest or moving in a straight line.
stationary
-Standing still not moving

-Having a fixed position; not moving
Force
A pull or push that causes an object to move, stop, or change direction.