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## How Do Simple Machines Make Work Easier?

Define the following terms:. A machine is a device by means of which work can be performed easily or in a convenient manner. A machine can be used : To lift heavy loads by applying little force. To enlarge magnitude of force To increase rate of work done To change the direction of force Example of simple machines are : Lever, pulley, inclined plane, wedge, screw etc. The power directly applied to a machine to lift a load is called Effort or Power. The weight lifted by a machine is called Load. The ratio of weight load lifted by a machine to the force effort applied on a machine is called mechanical advantage of the machine. Greater the value of mechanical advantage of a machine, more easier is the work done. It has no unit. Amount of work done on a machine by a given effort force is called input of a machine. Amount of work done by a machine on the load weight is called output of the machine. For latest informationfree computer courses and high impact notes visit : www. The ratio of output of a machine to the input of machine is called its efficiency. An ideal machine is a hypothetical machine whose output is equal to its input. For an ideal machine. Lever is a simple machine which is used to lift heavy bodies or heavy load in a very easy way. Lever consists of a rigid bar capable to rotate about a fixed axis called fulcrum. Effort is applied at one end of the bar and weight can be lifted from the other end. There are three kinds of lever depending upon the positions of loadeffort and fulcrum. In the first kind of lever, the fulcrum F lies between effort P and load W. Example: common balance, seesaw, scissors, handle of hand pump. In the second kind of lever, load W lies between effort P and fulcrum F. Example: door, nutcracker, punching machine. In the third kind of lever, effort P lies between load W and fulcrum F. Example: forceps, jaws, human forearm, firetong.

## Work, Power, and Simple Machines True or False?

Work is performed by applying a force over a distance. These six simple machines create a greater output force than the input force; the ratio of these forces is the mechanical advantage of the machine. All six of the simple machines listed here have been used for thousands of years, and the physics behind several of them were quantified by the Greek philosopher Archimedes ca. When combined, these machines can be used together to create an even greater mechanical advantage, as in the case of a bicycle. A lever is a simple machine that consists of a rigid object often a bar of some kind and a fulcrum or pivot. Applying a force to one end of the rigid object causes it to pivot about the fulcrum, causing a magnification of the force at another point along the rigid object. There are three classes of levers, depending on where the input force, output force, and fulcrum are in relation to each other. The earliest lever was in use as a balance scale by BCE; Archimedes is credited with saying "Give me a place to stand and I will move the earth. A wheel is a circular device that is attached to a rigid bar in its center. A force applied to the wheel causes the axle to rotate, which can be used to magnify the force by, for example, having a rope wind around the axle. Alternately, a force applied to provide rotation on the axle translates into rotation of the wheel. It can be viewed as a type of lever that rotates around a center fulcrum. The earliest wheel and axle combination known was a toy model of a four-wheeled cart made in Mesopotamia about BCE. Ferris wheelstires, and rolling pins are examples of wheels and axles. An inclined plane is a plane surface set at an angle to another surface. This results in doing the same amount of work by applying the force over a longer distance. The most basic inclined plane is a ramp; it requires less force to move up a ramp to a higher elevation than to climb to that height vertically. Archimedes's "On Plane Equilibrium" describes the centers of gravity for various geometrical plane figures. The wedge is often considered a double inclined plane—both sides are inclined—that moves to exert a force along the lengths of the sides. The force is perpendicular to the inclined surfaces, so it pushes two objects or portions of a single object apart. Axes, knives, and chisels are all wedges. The common "door wedge" uses the force on the surfaces to provide friction, rather than separate things, but it's still fundamentally a wedge. The wedge is the oldest simple machine, made by our ancestors Homo erectus at least as long ago as 1. A screw is a shaft that has an inclined groove along its surface.

## Work, Power, and Simple Machines True or False?

Work and the Six Simple Machines. We all use simple machine s every day, opening a door, turning on the water faucet, going up stairs, or opening a can of paint. Simple machines make work easier. There are six simple machines. They are:. Remember you can answer questions any way you like When you finished with the activity you must click on the worksheet with the right mouse button and select "back" to return to this book. If you close the page with the X on the upper right hand corner, you will need to re-open the book. Simple Machines History. Throughout history, people have learned ways to increase forcechange the direction of force, and increase the rate of work. We don't actually know what the first simple machine was, but it was probably a large stick used to move heavy objects rocks. The lever. Or it could be the sharp rock they used to scrape animal skins, the wedge. Logs were use early in modern building to move huge rocks by rolling them along. These logs became the wheel and axle around B. Watch how one man thinks Stonehenge and other wonders of the world were built using only simple machines and very little else. Throughout all the early civilizations, including, Lebanon, Peru, Bolivia, and Easter Island, simple machines were used to build magnificent buildings. In Lebanon, temples were built with blocks 64 feet long and 13 feet wide, weighing 1, tons apiece, a workforce of 25, men was required to raise one stone. The leverrollerspulleyswedgesand the screw were all used early in history. The industrial revolution helped bring people into the machine age and vastly increased the availability of many kinds of products. Machines enable people to do work with LESS muscle effort and with greater speed. What is the Science Definition of Work? You are doing work when you use a force to cause motion. Work is the transfer of energy through motion. In order for work to take place, a force must be exerted through a distance. There are two factors to keep in mind when deciding whether work is being done:. The amount of work a machine produces equals the force used multiplied by the distance the machine lifts or moves and object. How does a simple machine make work easier? Transferring the force from one place to another. Increasing the distance or speed of a force. Watch the video. Words to think about that use force — pushing, pulling, stretching, squeezing, bending, and falling. Forces can be equal — holding a book up in your palm of your hand, or a book laying on the table — Balanced Forces — Your hand or the table pushes up and the book pushes down. Whenever an object is caused to move, whether from a standstill or while already in motion, a force is required. Gravitational force causes every object to attract every other object; a ball falling to the ground; the moon orbiting the Earth. Every object in the universe exerts a force on every other object; that force is gravity. Friction occurs when two substances rub together. Rub your hands together. What did you feel?

## 6 Kinds of Simple Machines

How can a machine make work easier for you? Unit 2 lesson 4 1. First Name. A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to. Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine. How do machines make work easier? How do you calculate work what is the formula for work? What is the formula for mechanical advantage? How does friction impact work? A mechanical advantage B work input of the machine C work output of the machine D. A machine with velocity ratio 5 requires J of work o raise a load of N through a vertical distance of 1. More Similar Questions. Similar Questions Health Physics A machine is used to either do work or to convert energy. What does thepower take into account in addition to asked by Shannon on January 22, Physics A machine is used to either do work or to convert energy. What does thepower take into account in addition to asked by Anonymous on January 24, Health Physics A machine is used to either do work or to convert energy. What does thepower take into account in addition to asked by Shannon on January 23, physics Machines A, B, and C do the same amount of work, but they each take a different amount of time. Which machine asked by al on May 21, science percentages: to use a machine,u must do the work on the machine called input work. Science 1. A mechanical advantage B work input of the machine C work output of the machine D asked by Phidelis on June 25, physics A machine with velocity ratio 5 requires J of work o raise a load of N through a vertical distance of 1. Ask a New Question.