Up Up and Away January 25 2006 Calendar Today Some problems on vectors Introduction to some 2D issues Friday Monday 2D Kinematics Wednesday Exam 1 Through 2D Stuff finished on Monday Friday Going around in circles Find the horizontal and vertical components of the d 140 m displacement of a superhero who flies from the top of a tall building following the path shown in the Figure where 30 0 Superperson The helicopter view in Figure P3 35 shows two people pulling on a stubborn mule Let the magnitude of F2 64 0 N and the angle at which F1 pulls be 65 0 a Find the single force that is equivalent to the two forces shown The forces are measured in units of newtons symbolized N b b Find the force that a third person would have to exert on the mule to make the resultant force equal to zero c Use I j notation 2 Dimensional Motion We will consider motion the the x y plane Positions now have x y coordinates so we need to use vectors That s why we did that pointy stuff on Monday There are two types of problems we need to consider Throw or drop an object at an angle to the horizontal Make something go around in a circle Positions are VECTOR quantities ri r r f ri r f r Velocities Which way is the acceleration In 2D motion lots of things happen at once Velocity Position An Example What is its velocity here It s acceleration How long did it take to get here here height h RANGE R Let s Just Do it The Monkey Problem Hit or Miss Angle
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