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Address Lecture: Introduction of MECHANICS

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Address Lecture: Introduction of MECHANICS

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    1. Address Lecture: Introduction of MECHANICS Lecturer: Zaid Ghalib Abdulkadhim Zaid_galeb@yahoo.com

    2. CAR (VELOCITY) DOOR (FORCE) PEN (FRICTION) MECHANICS

    3. MECHANICS (Introduction) Mechanics is the physical science which deals with the effects of forces on objects. No other subject plays a greater role in engineering analysis then mechanics. Although the principle of mechanics are few, they have wide application in engineering.

    4. MECHANICS (Classification)

    5. MECHANICS ( rigid bodies ) Q/ Do you consider that the rigid bodies are perfectly rigid (no deformation). A/ Never, certainly the rigid bodies subjected to deformation under the loads, but these deformation are usually small and do not appreciably affect the conditions of equilibrium or motion of the structure under consideration.

    6. MECHANICS (Quantities)

    7. MECHANICS (Introduction) Force is the action of one body on another. A force tends to move a body in the direction of its action. The action of a force is characterized by its magnitude, by the direction of its action. The force unit is (Newton), the symbol (N).

    8. MECHANICS (Resolution & Composition of a force)

    9. MECHANICS (Resolution & Composition of a force)

    10. MECHANICS (Resolution & Composition of a force) from fig.(2) : The horizontal component may be determined as : The vertical component may be determined as :

    11. MECHANICS (Resolution & Composition of a force)

    12. MECHANICS (Examples) Ex/ (1) : Find the two components of the force (100N), if = 30, 120 , 270.

    13. MECHANICS (Examples) Solution : = 30 : Fx = F . cos Fx = 100 * cos 30 = 100 * 0.866 Fx = 86.6 N (Ans.) Fy = F . Sin Fy = 100 * sin 30 = 100 * o.5 Fy = 50 N (Ans.)

    14. MECHANICS (Examples) Solution : = 120 : Fx = F . cos Fx = 100 * cos 120 = 100 *(- 0.5) Fx = - 50 N (Ans.) Fy = F . Sin Fy = 100 * sin 120 = 100 * o.866 Fy = 86.6 N (Ans.)

    15. MECHANICS (Examples) Solution : = 270 : Fx = F . cos Fx = 100 * cos 270 = 100 *( 0 ) Fx = 0 N (Ans.) Fy = F . Sin Fy = 100 * sin 270 = 100 * (- 1 ) Fy = - 100 (Ans.)

    16. MECHANICS (Reference) Ferinand P. Beer, E. Russell Johnston, “Vector Mechanics for Engineers” Mc Graw Hill, 7th Edition (2004). J.L. Meriam, L.G. Krage, “Engineeing Mechanics Statics” John Wiley, Jons, Inc. Volume 1, 5th Edition (2002).

    17. MECHANICS (Examples) Thank you to listen

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