Chapter 11 Lesson 1

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Chapter 11Lesson 1

• Distance and Displacement

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• Inquiry Activity pg. 327
• How does a ramp affect a rolling marble?

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I. Motion

• A. Movement change in position
• B. How do you know something moves? Motion is a
  relative term
• 1. You can see it happening (observe)
• 2. Use a frame of reference
• a. Sun, moon, stars
• b. People standing beside the road
• c. Cars moving down the hi-way
• d. Seasons warmer and colder temps

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II. Distance vs. Displacement

• A. Distance length between two points
• 1. Use appropriate units
• a. Ex Mississippi River
• Appropriate 3780 km
• Inappropriate 3,780,000,000,000 µm
• B. Displacement length between two points and
  the direction of motion (vector)
• 1. Ex 5 miles north of Rock Rapids
• 2. Shortest length between points start and
  finish

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40 m
21 m S.E.
Similar to fig. 4 on page 331 in textbook
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Chapter 11Lesson 2

• Speed

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I. Speed

• A. Def - How fast something moves (rate of
  change)
• B. Requirements for speed
• 1. Distance traveled 30 meters, 30 miles, 30
  inches.
• 2. Time how long it took to move a certain
  distance. 3hrs, 3 min, 3 ms.

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• C. Calculating speed
• 1. Formula
• Speed Distance V Speed
• Time D Distance
• T Time

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• D. 3 Types of Speed
• 1. Instantaneous speed speed at one moment
• a. Ex Pg. 334 What is the instantaneous
  speed according to the speedometer?
• ? 35 mph
• 2. Constant Speed speed that does not change
  over a period of time.

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• a. Ex setting the cruise on a car at 55 mph.
• b. Ex What is the constant speed of the car
  in the following graph?

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• 3. Average Speed
• a. Def the total distance divided by the
  total time.
• b. Ex A deer walked 5 m in 10 min, 8 m in 23
  min, and 7 m in 7 min. What was its average
  speed?
• ?58720 meters
• ? 10 23 7 40 min
• ? formula v d/t
• ?20 meters / 40 min
• ? .5 meters / min

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• E. Distance Time Graph
• 1. Def seeing the motion of an object over
  time.

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Assignment 11.2 separate sheet of paper

• 1. A car traveled 325 km in 4.5 hours. What was
  its average speed in km/hr? What was its average
  speed in m/s?
• 2. A train speed along at 50 km/h for 8.25
  hours. What was its distance in km? What was
  its distance in meters? What was its distance in
  mm?
• 3. How many hours would it take for a car to
  travel 450 km at a rate of 35 km/hr?
• 4. Read 11.3 Acceleration.

72.2 km/hr
20 m/s
412.5 km
412,5500m
412,500,000 mm
12.9 hours
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II. Speed vs. Velocity

• A. Use same formula
• ? velocity distance / time
• B. Uses different labels
• ?Speed how fast something moves
• 1. Ex a tornado is moving 15 mph.
• ?Velocity how fast something moves in a
  certain direction.
• 1. Ex a tornado is moving 15 mph to the
  north.

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• C. Examples
• 1. 2 motorcycles traveling down the interstate
  in opposite directions at 70 mph? Speed /
  Velocity?
• 2. 2 bikers traveling 70 mph along a path in the
  same northern direction? Speed / Velocity?
• 3. 2 walkers walking down the road side by side
  at 5 mph? Speed / Velocity?
• 4. What is the velocity of an object that
  travels 70 miles in 1.5 hours from Rock Rapids
  towards Sioux City?

Speed
Velocity
Speed
46.7 mph South
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• D. In class Questions
• 1. What is the velocity of an airplane that is
  traveling from Mexico to Canada. It traveled
  1400 miles in 4.5 hours?
• 2. What is the velocity of a tornado that is
  traveling from Omaha to Des Moines. It took 5.75
  hours and traveled 200 miles?

311 mph North
34.8 mph East
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Chapter 11Lesson 3

• Acceleration

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I. Acceleration (11.3)

• Def rate of changing velocity
• 1. Ex a dragster
• ? idle ? green light ? leaps forward ? faster
  ? faster ? drag chute ? slower ? slower ? stops.
• 2. Change of Velocity
• a. Speed changes
• b. Direction changes

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• Formula
• 1. Acceleration
• velocity(final) velocity(initial)
• time
• 2. Always squared
• ? m/s2, mph2, km/hr2

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• Examples
• 1. A cars velocity changes from 0 m/s to 30 m/s
  10 seconds later. Calculate the cars average
  acceleration.
• 30 m/s - 0 m/s
• 10 sec
• ? 3 m/s2

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• In Class Problems
• 1. As a roller coaster starts down a hill, its
  speed is 10 m/s. 3 seconds later, its speed is
  32 m/s at the bottom of the hill. What is the
  roller coasters acceleration?
• 2. A bullet is fired from a gun. Its final
  velocity is 750 m/s. It traveled this distance
  in 0.75 seconds. What is the bullets
  acceleration?