Fig. P1.61, p.21

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Fig. P1.61, p.21
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Position

• Defined in terms of a frame of reference
• One dimensional, so generally the x- or y-axis

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Displacements
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Distance

• Distance may be, but is not necessarily, the
  magnitude of the displacement
• Blue line shows the distance
• Red line shows the displacement

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Velocity and Speed

• It takes time for an object to undergo a
  displacement
• The average velocity is rate at which the
  displacement occurs
• generally use a time interval, so let ti 0
• Speed is a scalar quantity
• same units as velocity
• total distance / total time
• May be, but is not necessarily, the magnitude of
  the velocity

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Instantaneous Velocity

• The limit of the average velocity as the time
  interval becomes infinitesimally short, or as the
  time interval approaches zero
• The instantaneous velocity indicates what is
  happening at every point of time

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AF_0201.swf AF_0203.swf
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Acceleration

• Changing velocity (non-uniform) means an
  acceleration is present
• Acceleration is the rate of change of the
  velocity
• Units are m/s² (SI), cm/s² (cgs), and ft/s² (US
  Cust)

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Do quiz 2a, 1-4
Fig. 2.9, p.35
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Fig. 2.10, p.36
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Fig. 2.7, p.33
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Kinematic Equations
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Fig. 2.12, p.39
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Fig. 2.14, p.43
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AF_0213.swf
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Vector Quantities

• Vector quantities need both magnitude (size) and
  direction to completely describe them
• Represented by an arrow, the length of the arrow
  is proportional to the magnitude of the vector
• Head of the arrow represents the direction
• Generally printed in bold face type

Scalar Quantities

• Scalar quantities are completely described by
  magnitude only

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Fig. 3.9, p.62
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AF_0306.swf
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Fig. 3.11, p.63
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Fig. 3.13a, p.65
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Fig. 3.13b, p.65
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Fig. 3.2, p.59
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AF_0302.swf
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Fig. 3.14, p.65
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Students
All
Take
Calculus
Fig. 3.14, p.65
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Fig. 3.15, p.66