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Lever A lever is a simple machine. It consists of a rigid rod, which moves freely about a supporting or fixer. This fixed point is called the fulcrum.
There are two more points on a lever where an effort and a load are applied. Consider the lifting or moving of a very heavy object from the ground. There are two ways to life it.
One is to lift it directly with hands. The rigid rod is a lever called crowbar. The crowbar makes the lifting of a heavy object easier. The heavy object lifted is called the load. The force applied to lift the load is called the effort. The support around which the rod moves is called the fulcrum.
Inclined Plane A plane surface that makes an angle with horizontal surface is called an inclined plane.
An inclined plane is another simple machine. It is often used to raise heavy objects. There are two ways to load a heavy object on a truck. Examples A winding road to a hill station is like an inclined plane. The staircases in buildings are like an inclined plane with steps.
Wedge A knife, an axe and a chisel act like two inclined planes put together. A screw is a simple machine. It has a winding edge called a thread. A screw is a spiral inclined plane. It is like an inclined plane wrapped around a cylinder, say a pencil. If you cut a piece of paper into a long, right angled triangle and then warp it around a pencil, the spiral edge looks like the thread of a screw.
The thread of a screw is an inclined plane. Wheel-and-Axle The wheel-and-axle is another simple machine. It consists of a wheel with a rod attached to it. The rod is called an axle. When we move the wheel the axle rotates.
The steering wheel of an automobile is a good example of the wheel-and-axle.
Just a little force on the rim of the steering wheel is enough to change the direction of the front wheels of the car. The same is the case with the handle of a bicycle. The screwdriver, egg-beater and the brace-and-bit are other common examples of wheel-and-axle.
Pulley It is a simple machine consisting of a while with a groove which bolds a rope. It is used to change the direction of force.
It is used to lift heavy loads or to draw water from the wall. A pulley consists of a circular disc made of wood or metal and it rotates about an axle passing through its centre.
While using a pulley, the load is attached to one end of the rope passing over the pulley and the effort is applied at the other end of the rope. Builders often use a pulley to lift bricks and cement bags to the top of the building.
Pulleys are also used in lifts and in railways to operate signals. Traffic police employ crane to lift cars from no parking sites on roads.
Maintenance of Machines Iron parts of machines get rusted. Outer parts of machines should be pained to avoid rusting. Moving parts of machines should be lubricated regularly with grease and oil; otherwise they will wear out faster.PTE Academic most repeated essay writings with helpful tips provided and essay solution to form a complete essay using the hints given.
Simple machines, such as the wheel and axle, are mechanisms created to make difficult work much easier.
The six simple machines consist of the inclined .
Introduction These suggestions are a companion to my separate essay on computer crime in the vetconnexx.com suggestions are like installing high-security deadbolt locks on doors of an office or home.
Editor’s Note: The original essay below, by New Atlantis contributing editor Matthew B. Crawford, was published in Mr. Crawford has expanded the essay into a bestselling book — Shop Class as Soulcraft: An Inquiry into the Value of Work — published in by Penguin.
To read excerpts from and reviews of the book, and to see interviews with Mr. Crawford, click here. Machines, an international, peer-reviewed Open Access journal. A combined strengthening of cutting tools for finishing has been carried out in glow discharge plasma filling a process vacuum chamber.
Simple machines can be used to make work easier and faster. Compound machines are basically simple machines placed together to work together.
Work is force acting on an object that moves it a distance (W=F*d).3/5(3).