Circular Motion

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Circular Motion
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• Uniform circular motion is the motion of an
  object in a circle with a constant or uniform
  speed.
• The distance of one complete cycle around the
  perimeter of a circle is known as the
  circumference.

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Circumference 2piRadius

• the speed of an object moving in uniform circular
  motion to the radius of the circle and the time
  to make one cycle around the circle (period).

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• 1. A spiraled tube lies fixed in its horizontal
  position (i.e., it has been placed upon its side
  upon a table). When a marble is rolled through it
  it curves around the tube, draw the path of the
  marble after it exits the tube.

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• This acceleration is directed towards point C ,
  the center of the circle.

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• The acceleration of an object is often measured
  using a device known as an accelerometer. A
  simple home- made accelerometer involves a lit
  candle centered vertically in the middle of a
  open-air glass.

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• 1. The initial and final speed of a ball at two
  different points in time is shown below. The
  direction of the ball is indicated by the arrow.
  For each case, indicate if there is an
  acceleration. Explain why or why not. Indicate
  the direction of the acceleration.

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. Identify the three controls on an automobile
which allow the car to be accelerated
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• 5. Which vector below represents the direction of
  the velocity vector when the object is located at
  point B on the circle? 
• 6. Which vector below represents the direction of
  the acceleration vector when the object is
  located at point C on the circle? 
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• 7. Which vector below represents the direction of
  the velocity vector when the object is located at
  point C on the circle? 
• 8. Which vector below represents the direction of
  the acceleration vector when the object is
  located at point A on the circle?

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• For an object moving in a circle, there must be
  an inward force acting upon it in order to cause
  its inward acceleration. This is sometimes
  referred to as the centripetal force requirement.
• The word "centripetal" (not to be confused with
  the F-word "centrifugal") means center-seeking

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