THE PRESENTATION

In simple wayIt 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 DistanceSo… 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 ClassFulcrum is in the middle of bar

Examples of 1st class levers:

Seesaw crowbar scissors

2nd ClassFulcrum 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

http://www.newton.mec.edu/Brown/TE/CATAPULTS/Catapult_animations.html