Machine:device that helps us do work
Simple Machine: tool or device made up of one basic machine.
Lever: simple machin with a plank that rotates on a fulcrum to lift an object.
Inclined Plane: simple machine made up of a board at angle to a flat surface.
Wedge:simplemachine that is forced into an object.
Screw:simple machine that is a cylinder with a spiral on the side.
Pulley:simple machine of a rope on a grooved wheel.
Wheel and Axle: simple machine made up of two wheels that turn together.
Complex Machine: system with many simple machines.
System: a group of parts that work together.
Subsystem: smaller group of parts within a complex machine.
Linkage: belt that transfers energy.
Gear pair of wheels with teeth.
Mechanical Advantage:amount a machine can multiply force.
Input Force: force appllied to a machine.
Output Force: force a machine applies.
Speed Ratio: measure of how the speed of the object is effected by the machine.
Friction: force that opposes movement.
Efficiency: measurement of how well a device uses energy.
Hydraulic System: system that uses liquid under pressure to move loads.
Pasals Law: the law that an external pressure applied to a fluid in a closed vessel is uniformly transmitted throughout the fluid.
Pressure:measure of the force applied in an area.
Design: the phisical form of a device.
Function: what the device is supposed to do.