Simple MachinesDefinitions: Machine - A device that facilitates work by changing the speed, direction, or amount of a force. Simple Machine – A device that performs work with a single motion. Simple machines include a lever, a wheel and axle, an inclined plane, a screw and a wedge. Ideal Mechanical Advantage (IMA) – A machine in which work is equal; such a machine would be frictionless and 100% efficient IMA= De/DrActual Mechanical Advantage (AMA) - This is pretty much the opposite of IMA, meaning it is not 100% efficient and that she has friction. AMA= Fr/FeEfficiency- The amount of work performed in a machine relative to the amount of useful work produced by the machine; always between 0% and 100%.Friction - The force that resists movement between two touching surfaces.Why do we use machines?Machines are used for many things. Machines are used in everyday life simply to make things easier. You use many machines per day, which you might take for granted. For example, a simple ordinary broom is a machine. It’s a form of leverage. Our country or our world would never be as evolved without the machine. Almost everything we do involves a machine. We use machines to manufacture goods, for transportation, etc. In the equation W=F*d, the tradeoff between force and distance is: When you operate a machine, the force decreases and the distance increases. If there was no friction, they would be equal and trade. There are six simple machines. These are a lever, pulleys, an inclined plane, a wheel and an axle, a screw and a wedge. The lever is used very often, an example of a lever is a broom. Your hand is the fulcrum and when you sweep it is a lever. A lever consists of a point of support, an effort and a resistance. A pulley is used to lift or pull objects with an advantage. To gain an advantage, the number of rows that will be loaded is important. For example, if there are 3 lines to the charge, it is a 3/1 advantage. An inclined plain is used to lift an object more easily but with more work. Instead of lifting it upwards, you push it a greater distance but with less force. A screw is an inclined plain wrapped around a cylindrical post. It's like a ramp around the screw. A wedge is an inclined plain with one or two inclined sides. Scissors, knives, and ax blades are examples of wedges. IMA is an ideal mechanical advantage signifying a frictionless world with 100% efficiency. This means that the work and training are exactly the same..