SECTION SPEED MEASURES HOW FAST POSITION CHANGES 10.2 Reading Study Guide - PowerPoint PPT Presentation

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SECTION SPEED MEASURES HOW FAST POSITION CHANGES 10.2 Reading Study Guide

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SECTION SPEED MEASURES HOW FAST POSITION CHANGES 10.2 Reading Study Guide BIG IDEA The motion of an object can be described and predicted. – PowerPoint PPT presentation

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Title: SECTION SPEED MEASURES HOW FAST POSITION CHANGES 10.2 Reading Study Guide


1
SECTION SPEED MEASURES HOW FAST
POSITION CHANGES10.2 Reading Study Guide
  • BIG IDEA The motion of an object can be described
    and predicted.
  • KEY CONCEPT Speed measures how fast position
    changes.
  • Review
  • An object in motion changes position with time.

2
  • Take Notes
  • I. Position can change at different rates.
  • 1. Fill in the description wheel for speed.

SPEED
a measurement
Faster speed covers more distance
distance compared to time
can be fast or slow
3
  • Calculating Speed
  • 2. Fill in the following outline.
  • I. Position can change at different rates.
  • A. Calculating speed
  • 1. Requires both distance and time.
  • 2. Formula is distance/time.
  • a. S stands for speed.
  • b. d stands for distance.
  • c. t stands for time.

4
  • 3. How does the unit for speed (m/s) relate to
    the formula for speed?
  • m is the unit of measurement for
    distance (meters)
  • s is the unit of measurement for time (seconds)

5
  • B. Average Speed
  • 4. If someone ran 100 meters in 20 seconds, then
    ran another 100 meters in 25 seconds, what would
    the runners average speed be over the whole 200
    meters? Show your work.
  • total distance 200 meters
  • total time 45 seconds
  • average speed d/t
  • 200 m/45s
  • 4.5 m/s

6
  • C. Distance-Time Graphs
  • 5. The distance-time graph below shows the
    motion of a cat. During the 100 seconds shown,
    the cat was walking, running, and resting. Label
    each line segment of the graph with a description
    of the cats motion. Explain your answers.
  • From 0-40 seconds, the cat is moving at a steady
    speed.
  • From 40-60 seconds, the cat is not moving.
  • From 60-100 seconds, the cat is moving faster
    than before.

7
  • II. Velocity includes speed and direction.
  • 6. Complete the main-idea web with information
    about velocity.

Changing either speed or direction causes a
change in velocity
Need to know speed and direction
VELOCITY
Is considered a vector because it has both
direction and size.
Represented graphically by an arrow
8
  • A-B. Velocity, Velocity Versus Speed
  • 7. Explain why velocity is a vector but speed is
    not.
  • By definition, a vector must have both size and
    direction. Velocity includes size (speed) and
    direction. Speed includes size but not direction.
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