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# Lecture1a(1)

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• 1. Today: Chapter 1, 2.1-2.4, 3.1-3.3 - Concept of a Force - Force as a vector, decomposition of forces - Some vector algebra - Newton’s laws - Equilibrium of Forces
• 2. Aerodynamic force
• 3. Vector: magnitude and direction
• 4. Sukhoi 37: Vectored thrust
• 5. Coordinate system
• 6. 4 3
• 7. Scalar product
• 8. Decomposition along non-orthogonal axes 1 3 1 1
• 9. Model as particle
• 10. Resultant force (in case of a particle) Single force that replaces all forces acting on a particle.
• 11. Newton’s laws (Principa,1687) -Law I A particle remains at rest or continues to move with uniform velocity (in a straight line with a constant speed) if there is no unbalanced force acting on it. -Law 2 The acceleration of a particle is proportional to the vector sum of forces acting on it, and is in the direction of this vector sum. -Law 3 The forces of action and reaction between interacting bodies are equal in magnitude, opposite in direction, and collinear (they lie on the same line)
• 12. Static equilibrium (Newton’s first law) The resultant is equal to zero Or, the sum of forces in and directions are zero