Chapter 3, Section 1

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Chapter 3, Section 1

• Pages 86-95
• Blue font Main Idea
• Red font Notes section

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• CPS Time!!

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• Motion an object is in motion when its distance
  from another object is changing.

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• Reference Point a place or object used for
  comparison to determine if something is moving.
• An object is in motion if it changes relative to
  a reference point.

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Reference Point

• Example You are walking down the hall.you are
  getting closer to the wall at the end.
• The reference point is the wall at the end.

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• CPS Time!!

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Reference Point
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• CPS Time!!

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• Meter basic SI unit of length. (m)
• A little longer than a yard.
• Smaller centimeter (cm), millimeter (mm)

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Calculating Speed

• Speed Def. How fast an object moves over a given
  time.
• Speed is a rate.

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To calculate or formula for speed
speed distance time
or
speed distance time
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• Speed is measured in (m/sec)
• You need the two units. (distance/time)

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• CPS Time!!

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Constant Speed

• Constant Speed speed is the same for an
  extended period of time
• Example Driving on a long trip on cruise control
  same speed for a long time.there is no
  variation.

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• CPS Time!!

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Average Speed

• Average Speed a speed that fluctuates (changes)
  throughout the course of time.
• Example distance between one class and another
  fast, stop by locker, start back up, talk to
  friends, rush off to class. There is no constant
  speed present

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How do we measure Motion?
By measuring its two parts Speed and
Direction!
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Velocity

• Velocity speed in a given direction.
• You must know the speed and direction of an
  objects motion to know velocity

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• CPS Time!!

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Velocity

• Ex Weather forecaster tells you Hurricane
  Wildcat is is moving 25 km/hr Eastward.
• Without the Eastward (direction)they are just
  giving you the speed.the direction speed gives
  you the velocity

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We call speed and direction together Velocity.
Velocity is the standard unit of measure for
motion.
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If a car drives West for 2 hours and goes 80
miles, the velocity is
40 miles per hour West!