All terms in this list:
inclined planes: wedges, screws, and ramps
lever: A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion. Specifically, a bar of metal, wood or other rig
fulcrum: The support about which a lever pivots.
effort arm: portion between the fulcrum and the effort applied in a lever
effort force: used to move an object over distances
1st class levers: the fulcrum is between the resistance and the effort forces
2nd class levers: the resistance is between the fulcrum and the effort force
3rd class levers: the effort force is between the fulcrum and the resistance
wheels: are modified levers
pulleys: a grooved wheel that turns on an axle
block & tackle: a system of fixed and movable pulleys
mechanical efficientcy: the output work to the work or energy put into a process
resistance arm: the side of the lever that carries the load
conservation law: states that is something is conserved; that is, something remains constant under certain conditions
air resistance: The action of friction that slows something moving through air.
friction: The rubbing of one object or surface against another.
conservative force: the energy expended when doing work against them is stored as potential energy and can be regained as kinetic energy
escape speed: the minimum speed that an object of mass m requires to leave a larger object of mass M so that mass m can not return due to gravitational attraction alone
central force: a conservative force between two bodies always pushes or pull along the line joining the centers of the bodies
machine: A mechanical or electrical device that performs or assists in the performance of human tasks, or is used for amusement (like a pinball machine). a device that changes the magnitude or direction of a applied force
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