Levers

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Levers
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First Class Lever
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Question 1

• Your input force is less than picking up the book
  with just your finger.
• The tradeoff is that you apply less force over a
  longer distance.

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Question 3

• The input force occurs in the opposite direction
  of the output force.
• This is a first class lever.

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Question 4

• Input force is the greatest when the fulcrum is
  closest to the input force.

• Input force is the least when the fulcrum is
  closest to the load.

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Question 5

• If I had to lift a very heavy object off the
  ground a small distance, I would place the
  fulcrum close to the load.

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Some Words About First Class Levers

• In a Type 1 Lever, the pivot (fulcrum) is between
  the effort and the load.

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Examples of First Class Levers

• See-Saw
• Hammers Claw
• Scissors
• Pliers

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Effort
Fulcrum
Load
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Second Class Lever
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Question 7

• In a Type 2 Lever, the load is between the
  fulcrum and the input force (effort).
• It is easiest to lift when the load is closest
  to the fulcrum.

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Examples of Second Class Levers

• Stapler
• Wheelbarrow
• Bottle opener

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Use this to help you answer question 6
Fulcrum
Effort
Load
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Third Class Lever
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Question 9

• In a Type 3 Lever, the effort is between the
  pivot (fulcrum) and the load.
• They help us do work by applying a smaller force
  over a longer distance.

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Examples of Third Class Levers

• Fishing Pole
• Tweezers

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Effort
Fulcrum
Load
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Archimedes Lever

• Give me a place to stand and I will move the
  earth.

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Archimedes

• Here are some ways Archimedes used levers to help
  defend Syracuse from the Romans. Syracuse was an
  independent Greek city-state. These devices were
  called ship shakers.

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Hands on Quiz

• Take a look around the room. Try to identify an
  object for each class of lever. Be prepared to
  discuss what you have found.