# Physics

An action that makes an object either move or change shape.
(EX: a push, a pull, a twist.)
Force
The sum of all forces acting on an object Net Force
A force that changes an object's motion or causes it to accelerate. Unbalanced Force
Forces that are equal & acting in opposite directions. Since the net force is zero, NO MOVEMENT OCCURS! Balanced Force
The transfer of energy as the result of motion. Work
(Note: Work is measured in Joules, Forces in Networks & Distance in Meters!) – This means that something has to MOVE in order for "work" to be done. Work = Force x Distance
Change's the amount and/or direction of the force that must be exerted to for work. You get the same work done with less force- thus it INCREASE EFFICIENCY! Machine
A machine that consists of only one part Simple Machine
A bar that is free to pivot about a fixed point called a fulcrum. The longer the effort arm the less required to move an object.
(EX: hammer, seesaw, wheelbarrow.)
Lever
A slanted surface used to raise objects. It decreases the force required to raise an object by increasing the distance.
Inclined Plane
An arrangement of one or more wheels & rope
(EX: the string on the flag pole.)
Pulley
A pulley that stays in place & turns as the cord moves over it. This pulley only gives a directional advantage- in other words, it only changes the direction of the force. it does NOT change the amount of the force or the distance. Fixed Pulley
A pulley that is able to move with the load being raised. This pulley gives a mechanical advantage- in other words, it decreases the force by increasing the distance.
(EX: amount of rope you pull!)
Moveable Pulley

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