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Unformatted text preview: 1/5/11 CHAPTER 2.1 NOTES Physics 195 Lecture (part one) 1/5/11 MAGNITUDE A vector A is a dde d t o B = 6 i8 j. The re sult ant ve ct or is in the positive x direction and has a magnitude equal to A. What is the magnitude of A? a. 1 1 b. 5 .1 c. 7 .1 d. 8 .3 answer e. 12.2 1/5/11 MOTION IN ONE DIMENSIONIn 1D, we usually write position as x(t).Since its in 1D, all we need to indicate direction is + or .Displacement in a time is: 1/5/11 AVERAGE VELOCITYVelocity v is the rate of change of positionAverage velocity in the time is: 1/5/11 INSTANTANEOUS VELOCITYConsider the limit or Instantaneous velocity v is defined as: 1/5/11 ACCELERATIONAcceleration a is the rate of change of velocityAverage acceleration in the time is: And instantaneous acceleration a is defined as: 1/5/11 ACCELERATION Constant velocity Zero acceleration Constant acceleration in the same direction as v Increasing velocity Constant acceleration opposite of v Decreasing velocity 1/5/11 IMAGES Each of the strobe photographs (a), (b), and (c) in was taken of a single disk moving toward the right, which we take as the positive direction. Within each photograph, the time interval between images is constant. Which photograph(s), if any, shows constant zero acceleration? Which shows constant positive acceleration? 1/5/11 QUESTIONS 1) If the velocity of some object is not zero, can its acceleration ever be zero ? A  Yes B  No 2) If the average velocity of a car during a trip along a straight road is positive, is it possible for the instantaneous velocity at some time during the trip to be negative?...
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This note was uploaded on 01/04/2011 for the course PHYS 195 taught by Professor Anderson during the Fall '07 term at San Diego State.
 Fall '07
 Anderson
 Physics

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