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Simple Machines

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hi everyone today we're going to talk about simple machines a simple machine is a device that makes work easier by magnifying or changing the direction of a force that means that simple machines allows I want to do the same work with less effort simple machines have been known since prehistoric times and were used to help build the amazing structures left behind by ancient cultures the Greek philosopher meetings identified three simple machines more than 2000 years ago the lever the pulley and the screw he discovered that a lever would create a mechanical advantage which means that using a lever allow a person to move something that would normally be too heavy for them to shift Archimedes said that with a long enough lever and a place to rest it a person could move the world over the next few centuries Morrison machines were recognized but it was less than 450 years ago that the last of the simple machines the inclined plane was identified there are six types of simple machines the lever the wheel and axle the pulley the inclined plane the wedge and the screw police and wheel and axles are both a type of lever wedges and screws are both types of inclined planes which type of simple machine has a specific purpose and where they help to work when speaking of simple machines work means use energy to move an object across a distance the further you have to move the object the more energy it takes to move it let's see how each type of simple machine helps do work a lever is a tool like a bar Rod that sits in turns on a fixed Support called a fulcrum when you use a lever you apply a small force over a long distance and the liver converts it to a larger force over a shorter distance some examples of levers are seesaws crowbars and tweezers a wheel and axle is easy to recognize it consists of a wheel with a rod in the middle you probably already know that it's easier to move something heavy if you can put it in something with wheels but you might not know why for one thing using Wheels reduces the friction or resistance between surfaces between the load and the ground secondly much like the lever a smaller Force applied to the rim of the wheel is converted to a larger Force traveling a smaller distance at the axle wheel and axles are used for machine such as cars bicycle scooters but they are also used in other ways like door knobs and pencil sharpeners it probably is a machine that uses a wheel with a rope wrapped around it the real often has a Groove in it which the fits into what end of the Rope goes around the load and the other end is where you apply the force Police can be used to move loads or change the direction of the force you are using and help make work easier by Allah can you to spread a week or Force out along a longer path to accomplish a job by linking multiple police together you can do the same job with even less Force because you are applying the force along a much longer distance pulleys may be used to raise and lower Flags lines or sales and are used to help raise and lower elevators I didn't find plane is a flat surface with one end higher any other inclined planes allow loads to slide up to a higher level instead of being lifted which allows the work to be accomplished with a smaller Force spread over a longer distance you may recognize an inclined plane as a simple machine used in ramps and slides a wedge is simply two inclined planes placed back to back it is used to push two objects apart a smaller Force applied to the back of the way is converted to a greater force in a small area at the tip of the wedge examples of wedges are axes knives and chisels a screw is basically an inclined plane wrapped around a pole screws can be used to hold things together or to lift things just like the inclined plane the longer the path the force takes the less force is required to do the work screws with more threads take forced to do a job since the force has to travel a longer distance examples of screws are screws nuts bolts jar lids and light bulbs these six simple machines can be to form compound or complex machines and are considered by some to be the foundation of all machinery for example a wheelbarrow is made of levers combined with a wheel and axle scissors is another complex machine the two blades are wedges but they are connected by a lever that allows them to come together and cut simple machines to help us do work every day every time you open door or a bottle cut up your food or even just climb stairs you are using simple machines take a look and see if you can identify the simple machines around you and figure out how they make it easier to do work

Uploaded by Carmen Harper.

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