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# STEAM 6A Lesson 5-6 - SIMPLE MACHINES (Guide Bimontly Exam)

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## Catalina Garcia

on 13 February 2016

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#### Transcript of STEAM 6A Lesson 5-6 - SIMPLE MACHINES (Guide Bimontly Exam)

Lesson 5-6
Bimestrial Guide Exam
January - February

Is the weight or resistance that need to be overcome.
FORCE:
Is a push or pull upon an object
LEVER:
A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force, as in raising or moving a weight at one end by pushing down on the other.
EFFORT:
CLASS ONE LEVER:
This type of lever has the fulcrum positioned between the effort and the load.
FULCRUM:
CLASS TWO LEVER:
CLASS THREE LEVER:
Is the point on which the lever balances or pivots.
Class 2 levers have the fulcrum at one end, and the effort is applied at the other end and the load can be found somewhere in between.
Class three levers have the fulcrum at one end, like class two levers, but in class three lever the position of the effort and the load are reversed.
Is the force that you apply to the Lever. Or to finish a job
SIMPLE MACHINE:
A simple machine could be: a Lever, Wheel and Axle, an Inclined plane, Screw and a Pulley; This are the most basic of tools.
EFFORT FORCE:
PULLEY
The pulley is what's called a simple machine

A small wheel with a grooved rim used with a rope or chain to change the direction of a pulling force and in combination to increase the force applied for lifting
RESISTANCE FORCE:
DOUBLE PULLEY SYSTEM:
A double pulley is a system of two pulleys used together to move a load.
SINGLE PULLEY SYSTEM:
A single pulley is a device composed of a wheel on an axle over which a rope, cord, or similar implement is looped.
The weight of the lead exerts the resistance force
When you pull down on a cord, your pull is called the effort force
GEARS
A toothed machine part, such as a wheel or cylinder, that meshes with another toothed part to transmit motion or to change speed or direction.
A gear is a device that transfer motion from one part of a machine to another.
COGS
Most gears are wheels or cylinders; these are sometimes called cogs.
TEETH
Gears usually have teeth on their edges that mesh together.
When one of then turns, it forces the other edge to turn with it.
TORQUE
A turning or twisting force.
GEAR TRAIN
Is a set of mechanical interconnected system formed by mounting gears on a frame so that the teeth of the gears engage
GEAR RATIO
The ratio of the speed of rotation of the powered gear of a gear train.
That means the small gear has to turn 3 times to turn the big gear once
BEVEL GEAR
Either of a pair of toothed wheels whose working surfaces are inclined to nonparallel axes.
WORM GEAR
A gear consisting of a spirally threaded shaft and a wheel with marginal teeth that mesh into it
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