Force - A push, pull or twist in a particular direction, Contact Force - a force that makes contact with the object to affect it., Non contact Force - a force that does not make contact with the object., Balanced Force - two or more opposite forces are balanced if their effects cancel each other out., Unbalanced Force - when one force is stronger than others and causes a change in motion., Gravity - All objects have a force that attracts them towards each other., Mass - How much stuff or matter an object contains, Weight - Is a force caused by gravity, Friction - Force that acts in the opposite direction to the way an object wants to move. , Work - occurs when a force causes an object to move in the direction of the force., Effort - how much force is needed to be applied to get a job done, Load - the force on a lever or material (the object being moved), Force multiplier - reduces the force necessary to do the work, Speed multiplier - reduces the distance that needs to be moved in order to do the work, Fulcrum - the fixed point a lever pivots around, Mechanical Advantage - Load/Effort, Buoyant force - When an object is placed in a fluid, the fluid exerts an upward force., Density - Mass/volume,

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