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Torque
a force that tends to cause a rotation about a pivot point.
Simple machines
a basic mechanical device that changes the magnitude, direction, or distance traveled of the force used when doing work.
Efficiency
a comparison of the amount of usable energy remaining after a process with the original amount of energy that went into the process.
Lever
a simple machine that consists of a rigid bar that turns about a pivot point (the fulcrum)
Gear
a simple machine that consists of a wheel with teeth on its perimeter that mesh with similar teeth of other gears to do work.
Wheel and axle
a simple machine consisting of a wheel with a rod running through its axis that acts as the pivot point.
Fulcrum
the point about which a lever pivots or rotates.
Mechanical advantage
the amount by which a simple machine multiplies an input force to produce an output force.
Pulley
that consists of a wheel and axle system with a groove around the perimeter of the wheel in which a rope, cable, or belt moves with the wheel as it rotates.
work
the energy transferred to a system by an external force when it acts on the system to move it
power
the rate of doing work
simple machines
a basic mechanical device that changes the magnitude, direction, or distance traveled of the force used when doing work
inclined plane
simple machine that consists of a plane whose opposite ends are at different heights
mechanical advantage
the amount by which a simple machine multiplies an input force to produce an output force
ideal mechanical advantage
the mechanical advantage for an ideal machine (100% efficient) with no friction
actual mechanical advantage
the mechanical advantage that accounts for all mechanical losses sustained through using a machine
efficiency
a comparison of the amount of usable energy remaining after a process with the original amount of energy that went into the process
lever
a simple machine that consists of a rigid bar that turns about a pivot point (the fulcrum)
fulcrum
the point about which a lever pivots or rotates
torque
a force that tends to cause a rotation about a pivot point
first-class lever
a lever in which the fulcrum is between the input and output forces
second-class lever
a lever in which the output force is between the input force and the fulcrum
third-class lever
a lever in which the input force is between the output force and the fulcrum
wheel and axle
a simple machine consisting of a wheel with a rod running through its axis that acts as the pivot point
gear
a simple machine that consists of a wheel with teeth on its perimeter that mesh with similar teeth of other gears to do work
pulley
a simple machine that consists of a wheel and axle system with a groove around the perimeter of the wheel in which a rope, cable, or belt moves with the wheel as it rotates
inclined plane
a simple machine that consists of a plane whose opposite ends are at different heights
compound machine
a machine that combines two or more simple machines
work
the energy transferred to a system by an external force when it acts on the system to move it
power
the rate of doing work
inclined plane
simple machine that consists of a plane whose opposite ends are at different heights
ideal mechanical advantage
the mechanical advantage for an ideal machine (100% efficient) with no friction
actual mechanical advantage
the mechanical advantage that accounts for all mechanical losses sustained through using a machine
first-class lever
a lever in which the fulcrum is between the input and output forces
second-class lever
a lever in which the output force is between the input force and the fulcrum
third-class lever
a lever in which the input force is between the output force and the fulcrum
compound machine
a machine that combines two or more simple machines
Note 
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