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# Danish's lever ppt

## on Sep 01, 2013

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## Danish's lever pptPresentation Transcript

• THE PRESENTATION
• In simple way It is a kind of simple machine Every machine is a combination of Different simple machines
• Incline plane lever Screw pully Wedge Wheel & axel
• Definition: a lever is a bar that is free to turn around a fixed point, called a fulcrum
• ‘WORK’ Remember that Work = Force x Distance So… this same equation applies to the work done by machines. Work done by you should be equal to the work done by the machine! The machine does the same amount of work, it just makes it easier for you!
• W (by you) = W (by machine) Fe x de = Fr x dr resistance force effort distance resistance distance THIS IS A TYPE OF LEVER!!!
• Effort force = the force YOU put in Resistance force = the force of the machine
• Compares your force with the force of the machine Which one should be bigger? The force of the machine! So…the MA measures how many times the force of the machine (resistance force) is greater than your force (effort force)
• Compare the resistance force to the effort force… Fr / Fe
• 1st Class Fulcrum is in the middle of bar
• Examples of 1st class levers: Seesaw crowbar scissors
• 2nd Class Fulcrum is on one end
• Examples of 2nd class levers: nut cracker bottle opener wheel barrow
• 3rd class Fulcrum on one end
• Examples of 3rd class levers: Tennis bat golf club etc.
• Uses There is a large no. of uses of lever , such as Scissor Nut craccker Bottle opener Wheel borrow Cricket bat See-saw etc.
• In our daily life the applications of lever is all around us, So we can say that life without lever is very difficult and some times its impossible