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Mechanics of Motion

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1. Motion is always dependent on from Where it is being measured ... C. Air Resistance. 1. What is it? 2. Without it, gravity affects all objects the same ... – PowerPoint PPT presentation

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Title: Mechanics of Motion


1
Mechanics of Motion
2
I. Motion
  • A. Occurs Everywhere in Everything
  • 1.Describing motion involves RATE
  • 2. Measures of rates of motion
  • a. Speed b. Velocity c. Acceleration
  • B. Motion is Relative
  • 1. Motion is always dependent on from Where it is
    being measured
  • 2. Objects moving together at the same rate have
    0 relative motion

3
II. Motion on the Earths Surface
  • A. Speed
  • 1. What is it?
  • 2. Examples of measurements
  • 3. Instantaneous
  • 4. Average speed Total distance

  • Total time

4
B. Velocity
  • 1. How is it different from speed?
  • 2. Constant -- straight line motion-- no change
    of direction
  • 3. Changing velocity-- examples

5
C. Acceleration
  • 1. Rate of rate
  • Change of Velocity Acceleration
  • Elapsed Time
  • 2. Examples
  • 3. Can be positive, negative, or directional
  • 4. Straight line is most commonly investigated

6
III. Motion in Free Fall
  • A. Speed in Free Fall
  • 1. Falling with no or negligible air resistance,
    affected only by gravity
  • 2. Increases speed at approximately 10 meters/sec
    each second
  • 3. This acceleration is termed g
  • a. Accurate value 9.8 m/sec2
  • b. Instantaneous speed in free fall v g t

7
III. Motion in Free Fall (cont)
  • A. Speed in Free Fall
  • 4. An object first propelled upward has same
    acceleration as one falling
  • a. Upward g slows object
  • b. Downward g speeds object

8
B. Distance in Free Fall
  • 1. Distance traveled per unit time increases due
    to g
  • 2. Average speed of object as it falls
    beginning speed final speed
  • 2
  • 3. Distance Average speed x elapsed time
  • 4. d 1/2 (v0 vf) t

9
C. Air Resistance
  • 1. What is it?
  • 2. Without it, gravity affects all objects the
    same
  • 3. Essentially, it is friction with air molecules

10
D. Rate of a Rate
  • 1. Acceleration is how fast something is getting
    faster (or slower)
  • 2. Equations for Free Fall
  • v g t d 1/2 g t2
  • 3. Equations for uniform motion
  • vf2 v02 2ax
  • x 1/2 (v0 vf) ( t )
  • x v0t 1/2 at2
  • vf v0 at

11
HOMEWORK--- Review Questions 1,3,4,8,11,17
T E 1,6,7,8,10
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