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...
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...
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 e...
In our daily life the applications of lever is
all around us, So we can say that life
without lever is very difficult and ...
Danish's lever ppt
Danish's lever ppt
Danish's lever ppt
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Danish's lever ppt

  1. 1. THE PRESENTATION
  2. 2. In simple way It is a kind of simple machine Every machine is a combination of Different simple machines
  3. 3. Incline plane lever Screw pully Wedge Wheel & axel
  4. 4. Definition: a lever is a bar that is free to turn around a fixed point, called a fulcrum
  5. 5. ‘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!
  6. 6. W (by you) = W (by machine) Fe x de = Fr x dr resistance force effort distance resistance distance THIS IS A TYPE OF LEVER!!!
  7. 7. Effort force = the force YOU put in Resistance force = the force of the machine
  8. 8. 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)
  9. 9. Compare the resistance force to the effort force… Fr / Fe
  10. 10. 1st Class Fulcrum is in the middle of bar
  11. 11. Examples of 1st class levers: Seesaw crowbar scissors
  12. 12. 2nd Class Fulcrum is on one end
  13. 13. Examples of 2nd class levers: nut cracker bottle opener wheel barrow
  14. 14. 3rd class Fulcrum on one end
  15. 15. Examples of 3rd class levers: Tennis bat golf club etc.
  16. 16. Uses There is a large no. of uses of lever , such as Scissor Nut craccker Bottle opener Wheel borrow Cricket bat See-saw etc.
  17. 17. 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

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