use of lever in sports.

Its a sports biomechanics topic in which students will know about levers and how its work in human body.

1. 2015/ 20 16 [ Levers in human body ] Vinod Baitha Sports S ciences & Biomechanics

2. Introduction When person is moving his leg - arms - any part of his body He depend on his Skelton system (muscle forces) by contraction or extension muscles. In fact the bone in moving work as A lever Levers cannot be changed , but they can be utilized more efficiently .

3. levers Definition of levers A rigid bar that turns about an axis of rotation or a fulcrum . Parts of a lever - Fulcrum Axis of rotation of the lever . - Effort Arm The part of the lever that the effort force . - Resistance Arm The part of the lever that applies the resistance force .

4. Classification of levers First Class Lever A first-class lever is a lever in which the fulcrum (Axis) is located between the input effort (Force) and the output load (Resistance). Second Class Lever Resistance (load) is located between the effort arm and the fulcrum . Third Class Lever The effort force is located between the fulcrum and the resistance .

5. The 3 Classes of Levers | | Force Arm | A R F | Force Arm | | R e s is t a n ce Arm | R | Resistance Arm | A | F A R | Force Arm Resistance Arm F | F AR 1st ARF 2nd AFR 3rd

6. 1 st class of lever in human body The joint between the skull and the atlas vertebrae of the spine the spine is the fulcrum across which muscles lift the head .

7. The joint between the hummers and radius – ulna .

8. 2 nd class of lever in human body The Achilles tendon , pushing or pulling across the heel of the foot .

9. 3 rd class of lever in human body The elbow joint : when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.

10. Benefit from lever ? Increase power Increase distance Increase speed Transfer power from one place to another precision in work safety Avoid risks

11. Reference www.dynamicscience.com.au/tester/solutions/hydraulicus/simplemach ineslevers1.htm http://www.montgomery.k12.ky.us/camargo/Projects/simplemachines/ simplemachines.htm  http://www.dynamicscience.com.au/tester/solutions/hydraulicus/human body.htm