POE 1.1 Mechanisms
Terms in this set (38)
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Actual Mechanical Advantage
The ratio of the magnitude of the resistance and effort forces applied to a system.
A continuous band of tough flexible material used to transmit motion and power within a pulley system.
A profession for which one trains and which is undertaken as a permanent calling.
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.
An external force applied to an object.
The ratio of useful energy output to the total energy input, or the percentage of the work input that is converted to work output.
The resistance that one surface or object encounters when moving over another.
The fixed point around which a lever rotates.
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.
A gear positioned between the driver and the driven gear used to change rotational direction.
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.
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.
The structure of or the relationship of the parts in a machine, or in a construction or process comparable to a machine.
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.
Distance between adjacent threads in a screw.
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.
Impeding effect exerted by one material object on another.
An inclined plane wrapped around a cylinder, forming the path and pitch.
Any of various elementary mechanisms including the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
A toothed wheel whose teeth engage the links of a chain.
A condition where there are no net external forces acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity.
Creating, designing, and transmitting technical information so that people can understand it easily and use it safely, effectively, and efficiently.
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.
A force that produces or tends to produce rotation or torsion.
What are the 6 simple machines ?
Wheel and Axle, Wedge, Screw, Inclined Plane, Lever, Pulley.
What is the trade-off that occurs when you use a simple machine?
Distance vs. Effort
What is a feature of static equilibrium?
The external forces on the object are zero. Also the effort and resistance moment are equal.
What is the main force that helps ensure that no machine is 100% efficent?
The force of fiction.
What is the magic number?
1 ,This is an ideal relationship between effort force(also called the load) and distance tradeoff.
A screw changes which kind of motion into linear motion?
What does the pitch of a screw signify?
It refers to the distance in segments per inch between consecutive
What is created when 2 or more gears are meshed?
What is the purpose of an Idler gear?
It allows the gears to rotate in the same direction.
What is the purpose of an mating gear?
It helps the gears rotate in different directions. A pair of these must always be the same size(diametric pitch)
What is the reladtionship between gear size and rpm?
There is an inverse relationship between gear size and rpm.