Air law

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- WHAT IS A LEVER, lever are simples machines. They are made up of a right bar and a point of support whic is also called a fulcrum. They are normally used to exer a large force using only a small force, tehy are a type of force multiplier.  THE MECHANICAL ADVANTAGES, the morepulleys a hoist has, less force must be to lift the load, but also the greater the amount of rope that has to be pulled

-ELEMENTS OF A LEVER, Resistance is a force that has to be overcomeb the use of another force the applied force. The point of support, or fulcrum, is the point about which the lever swings. The arms, force arm and resistance arm, correspond to the distance  between the fulcrum and the applied force or resistance
-THE LAW OF LEVER, is expresed mathematically using the following equation:   F · Bf= R · Br
-TYPES OF LEVER:  First class levers- the point of support, or fulcrum, is located between the force and the resistance   Second class levers- the resistance is located between the force and the point of support    Third class levers-the force is located between the resistance and the point of support
-WHAT IS A PULLEY, are wheelswith the lateral with the surface adapted, usually in the form of a channel, so that a rope or a belt may come in contact with it without comming off   WHAT IS A HAIST, is a combined set f pulleys that allows us to lift a great weight by applying a little strength
-TRANSMISSION TROGHT PULLEYS. The pulley that transmits the movement is called motor or driving pulley, and the pulley tah recives the movement, outputnor driven pulley
-TYPE OF TRANSMISSION TROUGHT PULLEYS,   Unitary transmissions, if the two pulleys are equal, the output pulley will rotate at the same speed as the motor pulley.      Multiplier transmissions, if the output pulley is smaller than the motor one, it will rotate faster. It is a speed multiplication meichanism     Reductive transmissions,if the output pulley is larger than the motor one it will rotate more slowly, it is a speed redutions mechanism.
-USE OF THE EQUATION FOR TRANMISSIONS THROUGHT PULLEYS 
 Dm · Nm= Ds · Ns
D- Diameter of the motor pulley 
N- speed of the motor pulley 
D- diameter of the output pulley 
N- speed of the output pulley

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