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Physics Study Guide

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You make a trip to the store and then return home. What is your displacement? ... Velocity can be studied by looking at a position, time graph ... – PowerPoint PPT presentation

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Title: Physics Study Guide


1
Physics Study Guide
  • Chapter 2 Section 1

2
Chapter 2 Section 1
  • Frame of reference
  • A coordinate system for specifying the precise
    location of objects in space
  • No reference frame is more correct than another

3
Chapter 2 Section 1
  • Path length
  • Total distance an object covers
  • Always positive

4
Chapter 2 Section 1
  • Displacement
  • Change in position of an object
  • Measured as straight line drawn from initial to
    final position
  • ?x xf xi where ? (delta) means change

5
Chapter 2 Section 1
  • Doesnt usually equal path length
  • Should include description of direction

6
Chapter 2 Section 1
  • You make a trip to the store and then return
    home. What is your displacement?

7
Chapter 2 Section 1
  • Average speed
  • Change in path length divided by the
    corresponding change in time
  • Avg speed path length
  • time

8
Chapter 2 Section 1
  • Average velocity
  • Total displacement divided by the corresponding
    change in time
  • Avg velocity displacement
  • time
  • V ?x
  • ?t

9
Chapter 2 Section 1
  • Can be positive or negative depending on
    displacement
  • You drive to a friends house 370 km to the west.
    If you left at 10 am and arrived at 3 pm, what
    is your average velocity?

10
Chapter 2 Section 1
  • A car travels 100 km. If the first half of the
    distance is driven at 50 km/h and the second half
    is driven at 100 km/h, what is the average
    velocity?

11
Chapter 2 Section 1
  • Heather and Matthew walk eastward with a speed of
    0.98 m/s. If it takes them 34 min to walk to the
    store, how far have they walked?

12
Chapter 2 Section 1
  • If Joe rides south on his bicycle in a straight
    line for 15 min with an average speed of 12.5
    km/h, how far has he ridden?

13
Chapter 2 Section 1
  • Simpson drives his car with an average velocity
    of 48 km/h to the east. How long will it take
    him to drive 144 km on a straight highway?

14
Chapter 2 Section 1
  • A bus travels 280 km south along a straight path
    with an average velocity of 88 km/h to the south.
    The bus stops for 24 min, then it travels 210 km
    south with an average velocity of 75 km/h to the
    south. How long does the total trip last? What
    is the average velocity for the total trip?

15
Chapter 2 Section 1
  • Velocity can be studied by looking at a position,
    time graph

Vslope of position, time graph for that
?t Slope rise ?x v run
?t
16
Chapter 2 Section 1
  • Instantaneous velocity
  • Velocity of an object at some specific point
  • Slope of tangent line at that point on position,
    time graph
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