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DYNAMICS LECTURESTOPICS are kinematics and free body motion
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Engineering Dynamics
Undergraduate Course- (ME-211)
Dr. Muhammad Kashif KhanAssistant Professor- Department of Mechanical Engineering, DHA Suffa University, Karachi.
January 2013 Email: [email protected]
Lecture-2
• Contents• Introduction of Mechanics • Mechanics of Solids• Application of Dynamics in Engineering & Daily Life• Books to Refer• Software for the Subject• Kinematics of Particles• Rectilinear Motion
1- Introduction of Mechanics
3- Mechanics of Solids
• Statics- equilibrium of a body that is at rest, or the body moves with constant velocity• Dynamics – deals with accelerated motion of a body
1) Kinematics– analysis of geometric aspects of a motion
2) Kinetics –analysis of the forces that cause the motion
4- Application of Dynamics in Engineering
4- Application of Dynamics in Engineering
2- Software for the Subject
Text BooksEngineering Mechanics-Dynamics by R. C. Hibbler
Reference Books 1. Engineering Mechanics by S. Timoshenko & D. A. Young
2. Vector Mechanics for Engineers-Dynamics by Ferdinand P. Beer & E. Russel Johnston Jr
2- Software for the Subject
• MSC Adams- The Multibody Dynamics Simulation Solution “Adams” helps engineers to study the dynamics of moving parts, how loads and forces are distributed throughout mechanical systems
• Matlab (Programming)• Simulink
5- Kinematics of Particles
Kinematics It is the study of the geometry of motion of particles, rigid bodies, etc., disregarding the forces associated with these motions.Kinematics of a particle- motion of a point in space
• Rectilinear MotionA particle moves in a straight line and does not rotate about its centre of mass.
• Circular Motion (Curvilinear Motion) A particle moves along a path of a perfect circle.
• General Plane Motion A particle moves in a plane, which may follow a path that is neither straight nor circular.
5-1 Rectilinear Motion
• Rectilinear Kinematics–specifying the particle’s position, velocity, and acceleration at any instant (time factor)
5-1 Rectilinear Motion
Rectilinear Motion• Position–Single coordinate axis, s–Magnitude of s= distance from origin (O) to current position (P)–Direction: +ve = right of origin; ‐ ve = left of origin
• Displacement–Change in the particle’s position, vector quantity–If particle moves from S1to S2∆s= s2-s1
5-1 Rectilinear Motion
5-1 Rectilinear Motion
5-1 Rectilinear Motion
5-1 Rectilinear Motion
5-1 Rectilinear Motion
5-1 Rectilinear Motion
5-1 Rectilinear Motion (Solve Please)
• An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff. (Ans =1720m)
• A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car. (Ans= 8.10m/s2)
• If by chance you fall from a roof and remain in air for 2.60 seconds, what will be your final velocity at that instance and how far you would be from the roof? (Ans= 25.48m/sec, 33.1m)
5-1 Rectilinear Motion (Solve Please)
• Azhar jumps in a jumping castle to height of 1.1 m. Determine his takeoff speed while striking back. (Ans= 4.64m/sec)
• As an engineer, assume you don’t know the depth of oil level under the earth, on a site. However, you have one pipe which is already well dig in. You dropped a stone through the pipe and you heard sound of stone in oil after 3.41 sec. Determine the depth of the well. (Ans= 57m)
• Now you start saying problems, one by one.
5-1 Rectilinear Motion (Solve Please)
5-1 Rectilinear Motion (Solve Please)
5-1 Rectilinear Motion (Solve Please)
5-1 Rectilinear Motion (Solve Please)
Thank You for Your Attention!!!!!
Any Questions?????