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chapter 2 physics notes

# chapter 2 physics notes - CHAPTER 2.1 NOTES Physics 195...

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1/5/11 CHAPTER 2.1 NOTES Physics 195 Lecture (part one)

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1/5/11 MAGNITUDE A vector A is added to B = 6 i-8 j. The resultant vector is in the positive x direction and has a magnitude equal to A. What is the magnitude of A? a. 11 b. 5.1 c. 7.1 d. 8.3 ¡ answer e. 12.2
1/5/11 MOTION IN ONE DIMENSION -In 1-D, we usually write position as x(t). -Since it’s in 1-D, all we need to indicate direction is + or −. -Displacement in a time is:

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1/5/11 AVERAGE VELOCITY -Velocity v is the “rate of change of position” -Average velocity in the time is:
1/5/11 INSTANTANEOUS VELOCITY -Consider the limit or -Instantaneous velocity v is defined as:

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1/5/11 ACCELERATION -Acceleration a is the “rate of change of velocity” -Average 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

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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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chapter 2 physics notes - CHAPTER 2.1 NOTES Physics 195...

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