Lesson 1.1 Mechanisms

Created by:

mpyle  on August 27, 2010

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Lesson 1.1 Mechanisms

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Definitions

ABET The recognized accreditor for college and university programs in applied science, computing, engineering, and technology.
Actual Mechanical Advantage The ratio of the magnitude of the resistance and effort forces applied to a system.
Belt A continuous band of tough flexible material used to transmit motion and power within a pulley system.
Career A profession for which one trains and which is undertaken as a permanent calling.
Chain A series of usually metal links or rings connected to or fitted into one another and used to transmit motion and power within a sprocket system.
Effort Force An external force applied to an object.
Efficiency The ratio of useful energy output to the total energy input, or the percentage of the work input that is converted to work output.
Friction The resistance that one surface or object encounters when moving over another.
Fulcrum The fixed point around which a lever rotates.
Gear A circular toothed object used to transfer rotary motion and torque through interlocking teeth.
Ideal Mechanical Advantage Ratio of distance traveled by the applied effort and resistance force within a system.
Idler Gear A gear positioned between the driver and the driven gear used to change rotational direction.
Inclined Plane A flat surface set at an angle or an incline with no moving parts that is able to lift objects by pushing or pulling the load.
Lever A rigid bar used to exert a pressure or sustain a weight at one point of its length by the application of a force at a second and turning at a third on a fulcrum.
Mechanism The structure of or the relationship of the parts in a machine, or in a construction or process comparable to a machine.
Moment The turning effect of a force about a point equal to the magnitude of the force times the perpendicular distance from the point to the line of action from the force.
Pulley A type of lever that is a wheel with a groove in its rim, which is used to change the direction or multiply a force exerted by a rope or cable.
Resistance Force Impeding effect exerted by one material object on another.
Screw An inclined plane wrapped around a cylinder, forming the path and pitch.
Simple Machine Any of various elementary mechanisms including the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Sprocket A toothed wheel whose teeth engage the links of a chain.
Torque A force that produces or tends to produce rotation or torsion.
Wedge A substance that tapers to a thin edge and is used for splitting, raising heavy bodies, or for tightening by being driven into something.
Wheel and Axle Two different sized circular objects that are attached together and turn as one.

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