More on Uniform Motion

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Physics Part 7

• More on Uniform Motion

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Uniform Motion

• Motion in which the objects displacement is
  equal for each time interval.

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• Are these people moving fast or slow? How can we
  tell?
• Person A Slow The line is not very steep
• Person B Fast - The line is very steep

B
A
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Slope

• The steepness of a line.
• The slope of a distance-time graph will tell us
  how fast the object is moving.
• The speed of the object.
• The slope of a position-time graph will tell us
  hoe fast the object is moving and in what
  direction.
• The velocity of the object.

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Describing Motion Graphs
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Describing Motion Graphs
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Describing Motion Graphs
Positive Slope Towards the reference point
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Describing Motion Graphs
Positive Slope Away from the reference point
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Describing Motion Graphs
Negative Slope Towards the reference point
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Describing Motion Graphs
Negative Slope Away from the reference point
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Describing Motion Graphs
Zero Slope Object is not moving (no change in
position) We say at rest
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Calculating Slope

• The slope of the line indicates speed.
• A steep line
• Less time to cover a distance
• Higher speed
• A less steep line
• More time to cover a distance
• Slower speed

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Calculating Slope

• Rise over Run

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Example

• A meerkat

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Example

• A meerkat moves to the right of its den.

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Example

• Another meerkat is initially 1.5m to the right of
  its den and moves to the left of it.

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Example

• A third meerkat is standing upright 2m to the
  right of its den.

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Practice

• Describe Rays drive to work at each interval.
• Include distance, time, speed, and direction.