# 45 - Racquetball Striking a Wall Copyright: Loren M....

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Physics 140: Winter 2012 Lecture #2 January 12, 2012 Dr. Dave Winn Racquetball Striking a Wall Copyright: Loren M. Winters Mt. Etna Andrew Davidhazy My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm

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A3.2 This illustration shows the path of a robotic vehicle, or rover. What is the direction of the rover’s average acceleration vector for the time interval from t = 0.0 s to t = 2.0 s? A. up and to the left B. up and to the right C. down and to the left D. down and to the right E. none of the above
The velocity and acceleration of an object at a certain instant are A. speeding up and following a curved path. B. speeding up and moving in a straight line. C. slowing down and following a curved path. D. slowing down and moving in a straight line. E. none of these is correct A3.7       22 ˆ 3.0 m/s ˆˆ 0.5 m/s – 0.2 m/s v = j a = i j At this instant, the object is

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Description of motion in 3D • Choose a coordinate system; choose its origin • The position vector r is from the origin to the location of an object (a point) • The position vector can be written in components: k z j y i x r ˆ ˆ ˆ
Description of motion in 3D • As the object moves, the position vector changes with time • Each component of vector r is now a function of time • Displacement vector: 1 2 r r r

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Basics of 3D motion Components of net acceleration along motion speed things up Components of net acceleration opposite motion slow things down Components of net acceleration perpendicular to motion turn things a
This is a map of the Rio de Janeiro Grand Prix course.

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## This note was uploaded on 01/18/2012 for the course PHYSICS 140 taught by Professor Evrard during the Winter '07 term at University of Michigan.

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45 - Racquetball Striking a Wall Copyright: Loren M....

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