System, Social System, Physical System, Human-Made System, Optical System, Mechanical System, Electrical System, Natural System, Energy, Subsystem, Mechanism, Input, Output, Simple Machine, Inclined Plane, Wedge, Screw, Lever, Fulcrum, Input (Effort) Arm, Output (Load) Arm, Input Force, Output Force, Load Force (Resistance), Type 1 Lever, Type 2 Lever, Type 3 Lever, Pulley, Gear, Gear Train, Wheel & Axle, Single Pulley, Double Pulley, Multiple Pulley, Fixed Pulley, Movable Pulley, Combination Pulley, Chain Reaction Machine, Gravitational Force, Electromagnetic Forces, Strong Nuclear Force, Weak Nuclear Force, Tensile Force, Compressive Force, Rotational Force, Magnetic Force, Electrical Force, Mechanical Force, Frictional Force, Static Friction, Sliding Friction, Lubricant, Newtons, Mass, Weight, Mechanical Advantage, Ideal Mechanical Advantage, Actual Mechanical Advantage, Work, Newton-Meters, Joules, Kilojoules, Kilonewtons, Energy, Efficiency, Percent

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