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Transcript of Simple Machines
over increased distances *There's a trade–off of energy when using simple machines. Ramp or Inclined Plane A flat surface that is higher on one end - slanting surface connecting a
lower level to a higher level. Inclined planes make the work of moving things easier - allows us to raise
an object with less effort than if we lifted it directly upward Trade-off: The way an inclined plane works is that to save effort, you
must move things a greater distance
* The longer the distance of the ramp, the easier it is to do the work
*It will take a much longer time to do the work Examples of Inclined Planes: Ramp Slide Lever A lever is a board or bar that rests on a turning point This turning point is called the fulcrum The applied force or effort or input force is the force you use to move
the lever Three Kinds Of Lever * 1st Class
* 2nd Class
* 3rd Class 1st Class Lever 2nd Class Lever 3rd Class Lever The applied force or effort is in the center – between the load
and fulcrum The load is in the center – between the fulcrum and the applied
force or effort Fulcrum in the center – between load & effort SeeSaw Pliers Scissors Wheel Barrow Nutcracker Bent Arm Fishing Rod Screw A screw has ridges and is not smooth like a nail They are also used to hold objects together Trade-off: The distance between the threads depends on the slope of the inclined plane - the steeper the slope, the wider the thread Screws with less distance between the threads are easier to turn Jar Lids Light Bulb Examples of Screw Wedge Wrenches A wedge is a simple machine used to push two objects apart Most wedges (but not all) are combinations of two inclined planes. Can also be round, like the tip of a nail Trade-off: To split something apart really wide, you have to push the wedge a long distance. Example of Wedge Axe Nails Fork Wheel & Axle A wheel with a rod, called an axle, through its center lifts or moves loads The increased distance over which the force is applied as the wheel turns results in a more powerful force on the axle, which moves a shorter distance. Trade-off: The larger the diameter of the wheel, the less effort you need to turn it, but you have to move the wheel a greater distance to get the same work done. Example of Wheel & Axle Door Knob Ferris Wheel Electric Fan Pulleys Pulleys let you move loads up, down, or sideways When you pull on one side of the pulley, the wheel turns and the load will move Pulleys are good for moving objects to hard to reach places Trade-off: as you increase the number of pulleys, you also increase the
distance you have to pull the rope.
*In other words, if you use two pulleys, it takes half the effort to lift
something, but you have to pull the rope twice as far
*Three pulleys will result in one-third the effort — but the distance
you have to pull the rope is tripled! 3 Types of Pulleys Fixed Pulley Movable Pulley Combination Pulley Examples of Pulley Flag Poles Crane Blinds Submitted By: Lorenz Domingo
Ronaldo Vidal *They allow us to use a smaller force to overcome a larger force