Lect1_Statics science in mechanics chemical eng. .pdf
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The document is a syllabus for a course on Engineering Mechanics - Statics by Dr. Ali Hussein Al-Shatri, covering key concepts such as mechanics, statics, dynamics, and kinematics, along with Newton's laws of motion. It introduces fundamental principles, including measurements, forces, and the importance of dimensional homogeneity in calculations. Additionally, it emphasizes the need for idealizations in theory application, such as rigid bodies and concentrated forces.
![Introduction to Mechanics
4
Mechanics is a branch of the physical sciences that is concerned with the
state of rest or motion of bodies that are subjected to the action of forces.
[1] Movement of systems of interconnected bodies under the action of
external forces
[2] Deformation is the change in the shape or size of an object
[3] Concerned with the mechanics of fluids and the forces on them](https://image.slidesharecdn.com/lect1statics-241105152404-8e8f3582/85/Lect1_Statics-science-in-mechanics-chemical-eng-pdf-4-320.jpg)
Lect1_Statics science in mechanics chemical eng. .pdf
- 1. Statics by Dr. Ali Hussein Al-Shatri Chemical Engineering Department College of Engineering and Petroleum Hadhramaut University 2024 - 2025
- 2. Engineering Mechanics - Statics, R.C. Hibbeler, 12th Edition. MAIN REFERENCE 2
- 3. ▪ Introduction to Mechanics ▪ Fundamental Concepts ▪ Units of Measurement ▪ Guidance on engineering calculation procedures and analysis ❑ Outlines: 3
- 4. Introduction to Mechanics 4 Mechanics is a branch of the physical sciences that is concerned with the state of rest or motion of bodies that are subjected to the action of forces. [1] Movement of systems of interconnected bodies under the action of external forces [2] Deformation is the change in the shape or size of an object [3] Concerned with the mechanics of fluids and the forces on them
- 5. General Principles 5 ❑Statics Find out the effect of loads on bodies in equilibrium. Deals with balanced loads Deals at rest or under motion at constant velocity ❑Kinematics Effect of motion without consideration of loads.
- 6. General Principles 6 ❑Dynamics Effect of loads on bodies in motion ➢Unbalanced loads ➢Acceleration
- 7. Fundamental Concepts 7 ❑Basic Quantities Length (L) ➢Used to describe distance, size ➢ Used to locate the position of points in space Time (T) ➢Explained the sequence or succession of events Mass (M) ➢Measure of a quantity of matter ➢Compare the action between bodies
- 8. Fundamental Concepts 8 Forces Force is considered as a "push" or "pull "' exerted by one body on another. ➢Direct contact ➢Electromagnetic ➢Gravitational a force is completely characterized by its magnitude and direction.
- 9. Fundamental Concepts 9 ❑Idealizations Are used in order to simplify application of the theory. Particle (the earth and its orbit) ➢ Constant mass ➢ Negligible size Rigid Body ➢ Combination of a large number of particles ➢ Relative position of particles remain fixed ➢ No internal deformation Concentrated Force ➢ represents the effect of a load acts at a point on a body ➢ Load acts very small compared to the overall size of the body (the contact force between a wheel and the ground)
- 10. Fundamental Concepts 10 ❑Newton’s Laws of Motion Engineering mechanics is formulated on the basis of Newton’s three laws of motion. First law. A particle originally at rest, or moving in a straight line with constant velocity, lends to remain in this state provided the particle is not subjected an unbalanced force. Fig. I- la
- 11. 11 ❑Newton’s Laws of Motion
- 12. 12 ❑Newton’s Laws of Motion
- 13. 13 ❑Newton's Law of Gravitational Attraction Shortly after formulating his three laws of motion. Newton postulated a law governing the gravitational attraction between any tow particles. Stated mathematically.
- 14. 14 ❑Newton's Law of Gravitational Attraction From Eq. 1- 2. we can develop an approximate expression for finding the weight W of a particle having a mass m1= m. If we assume the earth to be a non-rotating sphere of constant density and having a mass m2 = Me, then if r is the distance between the earth's center and the particle. we have
- 15. 15 Units of Measurement Table 1-2 provides a set of direct conversion factors between FPS and SI units for the basic quantities.
- 17. Numerical Calculations 17 ❑Dimensional Homogeneity The terms of any equation used to describe a physical process must be dimensionally homogeneous, that is each term must be expressed in the same units. ❑Rounding Off Numbers Rounding off numbers is necessary so that the accuracy of the result will be the same as that the problem data. 3.5587 is to be rounded off to three significant figures it became 3.56. ❑Calculations When a sequence of calculations is performed, it is best to store the intermediate results in calculator. Do not round off calculations until expressing the final result.
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