Block 6 Analysis of movement Lesson 5 Levers

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Block 6 Analysis of movementLesson 5 Levers
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Block 6 Analysis of movementLesson 5 - Levers

• Lesson 5 Objectives
•  

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Syllabus Section Unit 1 PHED1

• three classes of levers and examples of their
  use in the body related to the above specified
  sporting actions
• relationship of levers to effective performance
• mechanical advantages and disadvantages and
  range and speed of movement..

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Collect in Homework

• Check .
• Notes on muscle fibres
• Files checksheet
• Review
• Types of contraction

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Review of Muscular contractions

• Dynamic learning

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Levers

• Take 2 minutes with the person next to you to
  list where you might come across levers in
  everyday situations and why are they used?
• What features does every lever have?
• Fulcrum/pivot
• Load
• Effort

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Levers

• Levers can be classified into three classes of
  lever 1st, 2nd 3rd class levers
• Dynamic Learning slides

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1, 2, 3.. F, L, E.

• You can identify the class of lever by
  identifying the middle component
• 1st Class Lever Fulcrum in the middle
• 2nd Class Lever Load in the middle
• 3rd Class Lever Effort in the middle

L
E
F
E
L
F
E
L
F
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Mechanical Advantage/Disadvantage

• Key terms
• Effort arm The shortest perpendicular distance
  between the fulcrum and the effort

E
Effort Arm
F
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Mechanical Advantage/Disadvantage

• Key terms
• Load / Resistance arm The shortest
  perpendicular distance between the fulcrum and
  the load

Load Arm
L
F
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Mechanical Advantage

• Key terms
• Mechanical Advantage The effort arm is longer
  than the load arm

Effort Arm
Load Arm
L
F
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Mechanical Advantage

• Key terms
• Mechanical Advantage good for moving heavy
  loads but not very fast.

Effort Arm
Load Arm
L
F
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Mechanical Disadvantage

• Key terms
• Mechanical Disadvantage The load arm is longer
  than the effort arm

Effort Arm
F
Load Arm
L
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Mechanical Disadvantage

• Key terms
• Mechanical Disadvantage Good for moving fast
  with a good range of movement , but not
  efficient at moving loads

Effort Arm
F
Load Arm
L
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Homework
Download the photos showing the three different
classes of lever and add notes to the pictures
from your textbook P53-55 Make notes on
Mechanical Advantage and Mechanical Disadvantage.
Download the Levers table from the PE Website
and identify the class of lever at each joint