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# Simple Machines

### Revision for the simple machine exam

Machines A device that makes a pysical task easier.
Lever A simple machine that uses the turning effect of a force to make a task easier.
Examples of First Class Levers Hammer lifting nails, spoon opening a can
Examples of Second Class Levers Wheel barrow, nutcracker
Examples of Third order Levers Softball bat, broom
Speed multiplier Moves the load through a larger distance than the effort moves in the same time.
Force multiplier Moves a heavy load with a small force.
Inclined plane A surface that is set at an angle to the horizontal.
Examples of an inclined plane Ramp, wedge, screw
Describe a screw A ramp cut into the screw is the thread; Distance between the thread is the pitch.
Examples of wheel & axles Door knobs, taps, car steering wheels
Pulley A simple machine consisting of a single wheel & axle has a groove
What does a single fixed pulley do? Changes to direction of the effort.
Block & tackle A multiple pulley system used in garages, cranes, whaves, ships.
Gears Wheels & axles with teeth
Describe a bevel gear Gears at right angles to each other can change vertical motion to horizontal motion.
Example of bevel gears Hand operated eggbeater & drills.
Compound machine Two or more simple machines
How do you make a screw easier to use More threads on the screw; a smaller pitch on the screw; longer arms on the lever.
Equation to balance a lever Effort x Effort distance=Load x Load distance
If I have 4 pulleys and I wish to life a load 1 metre how much rope must I pull through. 4 metres
How do you calculate the mechanical advantage of a pulley? Divide load by the effort
Components of a First Class Lever Load Fulcrum Effort
Components of Second Class Lever Effort Load Fulcrm
Components of Third Class Lever Fulcrum Effort Load
Created by: James Cook

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