Basic Machines and How They Work
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The fulcrum is another object, perhaps a rock, used to brace under the long tool. This gives the long pole something to push down against. The location of the fulcrum helps determine how well the lever will perform work. The closer the fulcrum is to the object being lifted, the easier the person can lift the object. The longer the lever, the higher the object can be lifted. Do the math — it's really all in the distance between the object, the fulcrum and the lever.
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Levers are all around us. Some examples of levers are: door handles, the claws of a hammer for removing nails , crowbars, light switches, bottle openers and hinges.
The wheel has always been considered a major invention in the history of mankind. But it really would not work as well as it does had it not been for the axle. An axle is a rod or pole centered in the wheel that allows the wheel to turn around it. The wheel then spins in a balanced circle to be used as transportation on a bike or to turn the hands of a clock. Gears are a form of the wheel and axle. Wheels are found where things turn in a circle such as an electric fan, a motor, a revolving door, a merry go round, and any wheel — on the car, on your skateboard, or on a bicycle.
The inclined plane is simply a ramp. One end is higher than the opposite end. This allows things to go from a low point to a higher point. Or vice versa. It takes the same amount of work, but less force, to move an object up a ramp than to move it vertically. Gravity makes it easier to move an object down a ramp than up that ramp.
Ramps are used in skateboard parks, wheelchair ramps and to get heavy equipment in and out of the back of trucks. But a modified version of a ramp is also found in stairs, escalators, ladders, walking paths, even chutes used for dropping your mail into the mailbox. Some people might see the wedge as just an inclined plane, although it is actually two inclined planes. However, the use of a wedge is actually different in nature. The wedge is used to separate an object apart.
This is needed to cut, tear or break something in two. A wedge can also be used to keep things together or secure things from movement.
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Some examples of wedges that are used for separating might be a shovel, a knife, an axe, a pick axe, a saw, a needle, scissors, or an ice pick. But wedges can also hold things together as in the case of a staple, push pins, tack, nail, doorstop, or a shim. The pulley is actually a version of a wheel and axle that is combined with a rope, chain or other cord to allow moving something up and down or back and forth. The pulley can be combined with other pulleys to reduce the amount of work necessary to lift huge amounts of weight or to lower them down.
It can also make moving something such as a flag up the pole convenient to do from the ground. It changes the direction of the force necessary to do the work. I pull down on the rope, but the flag goes up. Pulleys are used in window blinds and drapery to move them up and down or back and forth.
Pulleys are also used on ships to raise and lower sails, in industry to raise and lower heavy cargo, or on cranes for use in moving construction equipment. Elevators also use pulleys to move the car up and down from floor to floor. The screw is really a twisted inclined plane. It allows movement from a lower position to a higher position but at the same time it moves it in a circle.
That makes it take up less horizontal space. A screw can also act to hold things together in some cases. Some examples of the uses of a screw are in a jar lid, a drill, a bolt, a light bulb, faucets, bottle caps and ball point pens. Circular stairways are also a form of a screw.
Another use of the screw is in a device known as a screw pump. A huge screw shape is lowered into the water and by turning the screw the water is moved up the twisted shaft and lifted to where it is needed. Screw pumps are often used in agricultural settings such as farms and for irrigation.
A person can push against a brick wall until they sweat. But unless they moved the wall — even a tiny bit — they did no work. But at the same time, if you scoot the computer mouse even a part of an inch, you have done work.
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Work in the scientific sense. Don't try to convince your parents or your teachers that you have done a lot of work by playing video games. Work can be measured.
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It is measured by the amount of distance that a force moves an object. Sir Isaac Newton was a very famous scientist who had a wonderful understanding of the relationship between force and motion.
For this reason, the measurement is known as a Newton. It is abbreviated with a capital N.
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The term joule is often used to measure work as Newtons per meter. New York. Basic Machines and How They Work book. Read 8 reviews from the world's largest community for readers.
Basic machines and how they work
This revised edition of an extremely clear Navy tra. Thoroughly covering basic theory, ranging from the lever and inclined plane up through internal combustion engines and power trains, this revised edition of an. Basic Machines and How They Work. This is a new edition. Click here to. A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use expanded lists of "simple machines", often using terms like basic machines, Although each machine works differently mechanically, the way they function is.