TYPES OF LEVER

Types of human lever

1. LEVER Dr darshan Parmar ( mpt -neuro)

2. WHAT IS LEVER ? A lever is a rigid bar which is capable of movement about a fixed point called fulcrum.

3. WHAT IS WORK DONE ? When a force or Effort (E) applied at one point on lever which acts upon another force or wight (W) acting at second point on lever.

4. Effort Arm: Perpendicular distance from Fulcrum (F) to the effort (E). Weight Arm: Perpendicular distance from Fulcrum (F) to the weight (W). Mechanical advantage: Ratio of weight to the effort. MA = W/E

5. 1 ST ORDER LEVER It is also known as lever of stability. Fulcrum is in between effort and weight (E,F,W) MA obtained when F is nearer to W. Example in human body: Atlantoaxial joint Example: Seasaw

6. 2 nd ORDER LEVER It is also known as lever of power Here weight is in between effort and fulcrum (E,W,F) MA is always obtained Example in human body: Heels raise Example: Scissors

7. 3 rd ORDER LEVER It is also known as lever of velocity Here Effort is in between fulcrum and weight. (F,E,W) MA is never obtained. Maximum found in human body Example in human body: Contraction of Biceps while flexion of elbow joint Example: Sugar tongs

8. REFERENCE THE PRINCIPLES OF EXERCISE THERAPY: DENA GARDINER 4 TH EDITION.