MMB222 DynamicsKinematics of particle:¾Position, displacement, velocity, acceleration¾One dimensional motion¾Graphical methods¾Relative motionProf. Jacek Uziak
2¾Kinematicsdeals with the concepts needed to describemotion¾Displacement or position: Dimension [L], SI unit meter(m)¾Velocity: Dimension [L/T], SI unit meters/second (m/s)¾Acceleration: Dimension [L/T2], SI unit meters/second-squared (m/s2)¾(Dynamicsdeals with the effect that forces have on motion)
4xPOxThe motion of a particle along a straight line is termed rectilinear motion. To define the position Pof the particle on that line, we choose a fixed origin Oand a positive direction.The distance xfrom Oto P, with the appropriate sign, completely defines the position of the particle on the line and is called the position coordinateof the particle.One Dimensional Motion
5Displacement¾Displacementis a vector that points from an object’s initial to final position, and whose magnitude is the distance between initial and final positions.xixfxifxxx−=∆origin
6Notation¾We typically (but not always!) precede a symbol with a delta(∆) to denote that it is the change, or differencein the quantity we are referring to¾examples: ifxxx−=∆12ttt−=∆bavvv−=∆
8Example¾The space shuttle travels at an average speed of 7.6x103m/s. The blink of an eye is roughly 100 ms. How far does the shuttle travel in the blink on an eye?