![[object Object]](https://image.slidesharecdn.com/kinetics2009-lecture2withtorquejoke-nottopost-100409125009-phpapp01/85/kinetics-2009-lecture-2with-torque-joke-not-to-post-1-320.jpg)
![[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Recomendados
Más contenido relacionado
La actualidad más candente
La actualidad más candente (20)
Similar a Kinetics 2009 Lecture 2with Torque Joke Not To Post
Similar a Kinetics 2009 Lecture 2with Torque Joke Not To Post (20)
Kinetics 2009 Lecture 2with Torque Joke Not To Post
- 4. Kinetics Study of Forces Associated with Movement
- 7. Tug of War 500 N 200 N 100 N 400 N 300 N
- 11. Resolution of Forces: Clinical Application 3 N 4 N
- 16. First Class Lever F R RA FA
- 17. 1 st Class Lever
- 18. 1 st Class Leverhttp://video.google.com/videoplay?docid=-1013712987391348587&ei=y0KUSuyeM5qIqQLfvsy7Dg&q=atlanto+occipital+joint&hl=en
- 20. Second Class Lever F R RA FA
- 21. 2 nd Class Lever
- 22. 2 nd Class Lever
- 24. Third Class Lever F R RA FA
- 25. 3 rd Class Lever
- 30. What class lever is this? What downward force must be exerted at F to balance the downward torques of R1 and R2? 1' 2' 9 lbs. 1 lbs. 3' R1 F R2
- 31. What class lever is this? What downward force must be exerted at F to balance the downward torques of R1 and R2? 1' 2' 5 lbs. 1 lbs. 4' F R1 R2
- 32. What class lever is this? What upward force must be exerted at F to balance the downward torque of R? What is the mechanical advantage of this lever? 9' 9' 6 lbs. F R
- 33. What class lever is this? What upward force must be exerted at F to balance the downward torque of R? What is the mechanical advantage of this lever? 3' 2' 5 lbs. F R
- 34. What class lever is this? What upward force must be exerted at F to balance the downward torque of R? What is the mechanical advantage of this lever? 5' 5' 5 lbs. F R
- 35. What class lever is this? What upward force must be exerted at F to balance the downward torque of R? What is the mechanical advantage of this lever? 2' 4' 2 lbs. F R
- 37. Types of Musculoskeletal Torque
- 44. Internal Torque
- 45. Moment Arm
- 54. Forces on Musculoskeletal System
Notas del editor
- Forces are vector quantities - have direction and magnitude Physical Movement - velocity, acceleration, deceleration Weight (both mass and pull of gravity) - pounds, Newtons Force - pounds, Newtons Stress - pascal Friction - Work Arrows indicate vectors - #’s usually accompany vectors showing amount of force. Vectors can be added or subtracted if working in the same line Rugby scrum – Five Guys pushing – 70/60/30/40/50 against four guys 100/75/75/75 250 against 325 - four guys win
- Magnitude – length of vector indicates “size” Direction – which way it is acting Sense – is it positive (muscle) or negative (resistance) Point of Application – Where it is acting
- Example: Movement of arms, legs is rotatory A B
- Example: Draw rectangle on board 3 by 4 with internal line 5 3 N 4 N 5 N
- Demonstrate with levers
- Torque is an expression of effectiveness of a force in turning a lever system. Such as opening a car door Using a lever to lift something - longer the force arm less force needed – demonstrate with levers (Aristotle moving the Earth) Clinical application - passive stretching - demonstrate with elbow extension points at wrist and midway to elbow
- Demonstrate with lever and fulcrum. In balance - forces and force arms equal Or in other words if equal weight on each side Think of a see saw -can adjust length of arms
- Demonstrate - have fulcrum at one end, resistance in middle and use “fish scale” to show force used Brachioradialis origin – proximal 2/3 of the lateral supracondylar ridge of the humerus and lateral intermuscular septum Inserts - lateral side of the base of the styloid process of the radius
- Demonstrate again with the force applied in the middle of the lever. Is more force required if the lever is longer and the resistance further away?
- Demonstrate with different lengths of the force arms and resistance arms, to maintain equilibrium. Do calculations - see examples from past. Go back to type of levers 1 st class show amount of force with one pound on one end 2 nd class – resistance is closer to the fulcrum RA – 1ft. FA – 2ft. Resistance is 1# RA x R = FA x F 1 x 1 = 2 x (answer is .5 #) 3 rd class – force closer to fulcrum R equal 1# RA - 2 ft. FA – 1ft RA x R = FA x F 2 x 1 = 1 x (answer is 2#)
- Demonstrate with lever and fulcrum - 1 st class lever (R1A x R1) + (R2A x R2) = FA x F (9 x 1) + (3 x 1) = 3 x (answer or Y) 12 = 3 x (Y) or answer is 4 #
- Demonstrate with lever and fulcrum 1 st class lever (R1A x R1) + (R2A x R2) = FA x F (5 x 1) + (3 x 1) = 4 x (answer or F) 8 = 4 x (F) or answer is 2 #
- Second class lever – (RA x R) = FA x F (9 x 6) = 18 x (answer or F) 54 = 18 x (F) or answer is 3 # MA = FA/RA MA = 18/9 or 2
- Second class lever – (RA x R) = FA x F (5 x 3) = 5 x (answer or F) 15 = 5 x (Y) or answer is 3 # MA = FA/RA MA = 5/3 or 1.67
- Third class lever – (RA x R) = FA x F (10 x 5) = 5 x (answer or F) 50 = 5 x (F) or answer is 10# MA = FA/RA MA = 5/10 or 0.5
- Third class lever – (RA x R) = FA x F (6 x 2) = 2 x (answer or F) 12 = 2 x (F) or answer is 6 # MA = FA/RA MA = 2/4 or 0.5
- Example in Brunnstrom - page 36 torque changes for external force – Example is Brunnstrom page 36 picture lifting weight - moment arm is essentially the resistance arm closer to the body less force a person is lifting. -- Overhead # 2 Moment Arm - exists for a moment - Overhead # 3 Example page 62 for internal force or force of muscle - Overhead # 4 Page 73 and 77 of Roberts