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How to save effort
during the building
process??
How did the ancient Egyptians manage
to move stone blocks weighing tons?
How did the ancient Egyptians raise the
pyramid stones without using our
modern machines?
THE MAIN
PURPOSES
OF SIMPLE
MACHINES
The Six Simple Machines
Mechanisms that manipulate force and
distance.
Screw
Wedge
Wheel and Axle
𝑰𝒏𝒑𝒖𝒕
side
𝑶𝒖𝒕𝒑𝒖𝒕
side
1st Class Lever
• Fulcrum is located between the effort and the resistance force
• Effort and resistance forces are applied to the lever arm in the
same direction
• Only class of lever that can have a MA greater than or less than 1
MA =1
Effort Resistance
Resistance Effort
MA <1
Effort Resistance
MA >1
2nd Class Lever
• Fulcrum is located at one end of the lever
• Resistance force is located between the fulcrum and the effort
force
• Resistance force and effort force are in opposing directions
• Always has a mechanical advantage >1
Resistance
Effort
3rd Class Lever
• Fulcrum is located at one end of the lever
• Effort force is located between the fulcrum and the resistance
• Resistance force and effort force are in opposing directions
• Always has a mechanical advantage < 1
Resistance
Effort
The mechanical advantage of
simple machines
It tells you how much a simple machine
is going to help you
The mechanical advantage of a lever is the
ratio of the length of the lever on the
applied force side of the fulcrum to the
length of the lever on the resistance force
side of the fulcrum.
The ideal mechanical advantage of
levers
The mechanical advantage of
inclined plane
Calculating the MA of Gears
• Example:
• 10 tooth Input gear
• 30 Tooth output gear
• MA = output/ input
• MA = 30/10
• MA = 3:1
• MA = 3 X the torque, 1/3 the speed output
Session (17) LO5 Simple machines.pptx

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Session (17) LO5 Simple machines.pptx

  • 1.
  • 2. How to save effort during the building process??
  • 3. How did the ancient Egyptians manage to move stone blocks weighing tons?
  • 4. How did the ancient Egyptians raise the pyramid stones without using our modern machines?
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. The Six Simple Machines Mechanisms that manipulate force and distance.
  • 14.
  • 15.
  • 17.
  • 18.
  • 19. 1st Class Lever • Fulcrum is located between the effort and the resistance force • Effort and resistance forces are applied to the lever arm in the same direction • Only class of lever that can have a MA greater than or less than 1 MA =1 Effort Resistance Resistance Effort MA <1 Effort Resistance MA >1
  • 20. 2nd Class Lever • Fulcrum is located at one end of the lever • Resistance force is located between the fulcrum and the effort force • Resistance force and effort force are in opposing directions • Always has a mechanical advantage >1 Resistance Effort
  • 21. 3rd Class Lever • Fulcrum is located at one end of the lever • Effort force is located between the fulcrum and the resistance • Resistance force and effort force are in opposing directions • Always has a mechanical advantage < 1 Resistance Effort
  • 22.
  • 23.
  • 24. The mechanical advantage of simple machines It tells you how much a simple machine is going to help you The mechanical advantage of a lever is the ratio of the length of the lever on the applied force side of the fulcrum to the length of the lever on the resistance force side of the fulcrum.
  • 25.
  • 26.
  • 27.
  • 28. The ideal mechanical advantage of levers
  • 29. The mechanical advantage of inclined plane
  • 30.
  • 31. Calculating the MA of Gears • Example: • 10 tooth Input gear • 30 Tooth output gear • MA = output/ input • MA = 30/10 • MA = 3:1 • MA = 3 X the torque, 1/3 the speed output