|An action that makes an object either move or change shape.
(EX: a push, a pull, a twist.)
|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.)
|A slanted surface used to raise objects. It decreases the force required to raise an object by increasing the distance.
(EX: a loading ramp.)
|An arrangement of one or more wheels & rope
(EX: the string on the flag pole.)
|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!)