Physics Weekly

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Chapter 3: Linear Motion
Marymount High School
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Physics Syllabus

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Judith S. de Nuño
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Chapter Objectives:

  • Explain the idea that motion is relative.
  • Define speed and distinguish between instantaneous speed and average speed.
  • Distinguish between speed and velocity, and describe how to tell whether a velocity is changing.
  • Define acceleration and give examples of its units.
  • Describe the motion of an object in free fall.
  • Describe the motion of an object thrown straight up and allowed to fall until it hits the ground.
  • Determine the speed and the distance fallen at any time after an object is dropped from rest, when air resistance is negligible.
  • Explain how graphs can be used to describe relationships among time, distance, and speed.
  • Describe how air resistance affects the motion of falling objects.
  • Explain why acceleration is a rate of a rate.

Chapter Terms:

  • speed
  • velocity
  • acceleration
  • free fall

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Chapter Formulas:

Speed = distance/time

Average Speed = total distance covered/time interval

Acceleration = change of velocity/time interval

Acceleration (along a straight line) = change in speed/time interval

Velocity acquired in free fall from rest: v = gt

Distance fallen in free fall from rest: v = ½ gt2


Chapter Outline Framework:

  • Motion is Relative
    • Instantaneous Speed
    • Average Speed
  • Velocity
  • Acceleration
    • Accelerationon Galileo's Inclined Planes
  • Free Fall
    • How Fast
    • How Far
    • How Quickly How Fast Changes
  • Hang Time

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The Formulator
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Animated Graphics Courtesy of
Jo's World