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energy

the ability to do work

potential energy

stored energy

kinetic

energy due to motion

mechanical

ability to make something move

motion

change of an objects position

speed

rate

instantaneous speed

the car's speed at one particular moment

velocity

objects moving over a given time in a certain direction

acceleration

a change in velocity during a period of time

force

push or pull

friction

force that keeps objects moving from moving against other objects

momentum

mass and velocity of an object

work

to move something

newtons

force is measured by it

joule

a unit to measure work

machine

object that makes work easier

effort force

effort

resistance force

resistance

fulcrum

the spot where the bar turns or pivots

first-class lever

fulcrum is located between the effort and the resistance

second-class lever

fulcrum located between the effort and the resistance

third-class lever

effort between the resistance and the fulcrum

pulley

grooved wheel with a chain or rope wrapped around it

fixed pulley

a pulley that does not move

moveable pulley

it moves with the load or resistance

block and tackle

it combines multiple fixed and moveable pulleys

mechanical advantage

decrease in effort that is need to move an object

wheel and axel

consists of a wheel, rod, or and axle running through the wheel

inclined planed

a flat inclined surface

wedge

two inclined planes back-to-back

screw

inclined plane wound around a cylinder or cone

threads

ridges in the screw

compound machine

combines two or more simple machines to make work even easier

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