1. MAE 242 Dynamics – Section I Dr. Kostas Sierros

2. Problem 1

3. Problem 2

4. Problem 3

5. Problem 4

6. Review 2 Chapter 12: Kinematics of a particle Chapter 13: Kinetics of a particle: Force and acceleration Chapter 14: Kinetics of a particle: Work and energy Chapter 15: Kinetics of a particle: Impulse and momentum Chapter 16: Planar kinematics of a rigid body

7. Chapter 12: Kinematics of a particle Rectilinear kinematics Graphical solutions Curvilinear motion x,y,z Projectile motion Curvilinear motion n,t Curvilinear motion r, θ, z Absolute dependent motion of two particles Relative – motion analysis using translating axes

8. Chapter 13: Kinetics of a particle Force and acceleration Kinetics Inertial coordinate systems

9. Chapter 14: Kinetics of a particle Work and energy Work of a force The principle of work and energy Power and efficiency Conservation of energy

10. Chapter 15: Kinetics of a particle Impulse and momentum Principle of linear impulse and momentum for a particle Conservation of linear momentum for particles Mechanics of impact Concept of angular impulse and momentum

11. Chapter 16: Planar kinematics of a rigid body Types of rigid body planar motion Rigid body translation and motion about fixed axis Planar motion using absolute motion analysis Provide a relative motion analysis of velocity and acceleration using a translating frame of reference Instantaneous center of zero velocity Relative motion analysis of velocity and acceleration using a rotating frame of reference

12. Chapter reviews Chapter 12: pages 96-99 Chapter 13: pages 162-163 Chapter 14: pages 212-213 Chapter 15: pages 286-287 Chapter 16: pages 382-383 Book chapter reviews give you a good but brief idea about each chapter…

13. Midterm exam 2 will consist of 4 questions. 3 questions must be solved. The 4 th question will be a bonus question. Sub-questions may include statements of theoretical definitions Midterm exam counts for 15% of the total mark I will bring new formulae sheets. Come on time. Since the lecture theatre will be used for another class at 9:15, there will be no extra time Calculators with memory are not allowed NO MAKE – UP EXAM THIS TIME General exam rules

14. Problem solving MUSTS 1. Read the problem carefully (and read it again) 2. Physical situation and theory link 3.Draw diagrams and tabulate problem data 4.Coordinate system!!! 5.Solve equations and be careful with units 6.Be critical. A mass of an aeroplane can not be 50 g 7.Read the problem carefully

15. Problems solved in class I 12.9, 12.22, 12.26, 12.42, 12.53, 12.65, 12.71, 12.83, 12.84, 12.100, 12.111, 12.153 13.5, 13.15, 13.34, 13.45, 13.51 14.10, 14.15, 14.17, 14.65 15.5, 15.6, 15.10, 15.13, 15.31, 15.54, 15.55, 15.59, 15.87, 15.90, 15.101, 15.109 16.1, 16.5, 16.19 16.43, 16.87

16. Problems solved in class II Solutions to all problems solved in class will be posted today http://www.mae.wvu.edu/~cairns/teaching.html Help session will take place on Wednesday 24 th of October between 5:00 – 6:00 in ???? Groups need to provide problems that they want to solve again during help session

17. …AND…GOOD LUCK STUDY HARD…