Day 4 10/21/10

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Day 4 10/21/10

• Topic Accelerated Motion Diagrams
• Objective I will analyze accelerated motion
  using a motion diagram with acceleration arrows
• Science Starter Next slide

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Science Starter

• . What did you need to do to obtain the x-t
  graph shown
• Motion diagram

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Acceleration Arrows

1. In addition to the position and velocity of the
   object we can also represent the acceleration of
   the object on the motion diagram.
2. The length of the acceleration vector is
   proportional to the difference between the two
   velocity vectors.

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A car starts from rest and speeds up. The
direction of the acceleration is in the same
direction as the direction of its velocity.
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A car slows down to a stop. The direction of the
acceleration is opposite to the direction of the
cars velocity.
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A ball rolls down a ramp, increasing its speed
as it moves down the ramp. Note motion diagrams
are usually drawn parallel to the direction of
motion.
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Practice 2.4 Acceleration

• Complete remaining problem for grade.