Force%20and%20Motion-II:%20continued%20Friction%20and%20Drag;Circular%20Motion - PowerPoint PPT Presentation

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Force%20and%20Motion-II:%20continued%20Friction%20and%20Drag;Circular%20Motion

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... in Circular Motion. Centripetal acceleration: ... FORCES IN CIRCULAR MOTION. An 'unbalanced' force must cause the acceleration. ... PERIOD IN CIRCULAR MOTION ... – PowerPoint PPT presentation

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Title: Force%20and%20Motion-II:%20continued%20Friction%20and%20Drag;Circular%20Motion


1
Force and Motion-II continuedFriction and
DragCircular Motion
  • Lecture 6
  • Monday2 February 2004

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UNIFORM CIRCULAR MOTION
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CIRCULAR MOTION
  • When an object travels in a circle, its velocity
    is constantly changing (in direction-at least).
  • That means the object has a non-zero acceleration
    even if it moves at constant speed.

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What is the direction of this acceleration?
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Acceleration in Circular Motion
  • Centripetal acceleration
  • Direction
  • Toward the center of the circle
  • Magnitude

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FORCES IN CIRCULAR MOTION
  • An unbalanced force must cause the acceleration.

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Using Freebody Diagrams to Analyze Forces
Twirl a ball attached to a string in a vertical
circle. What forces act on the ball and what are
the direction of these forces?
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Using Freebody Diagrams to Analyze Forces
What forces act on the ball and what are the
direction of these forces?
Top
a
T
Are we missing a force? (the centripetal force)?
Is the acceleration g?
W
T
Bottom
a
W
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Using Freebody Diagrams to Analyze Forces
What forces act on the ball and what are the
direction of these forces?
Top
a
-T-Wm(-a) or TWma
T
W
T-Wma
T
Bottom
a
Are we missing a force? (the centripetal force)?
Is the acceleration g?
W
17
Any force can be a centripetal force.
-Gravitational Attraction -Tension in a
string -Normal Force -A push or pull
Does the planet in orbit here have a
gravitational force AND a centripetal force
acting on it?
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PERIOD IN CIRCULAR MOTION
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