Lecture9 - Centripetal force Radial or Centripetal...

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Unformatted text preview: Centripetal force Radial or Centripetal acceleration = d d t a R = v 2 r = - 2 r where |v| = cost This is because v change direction. but |a| = 0 F centripetal = m a centripetal Since a = 0 there must be a (total) force acting on the object that makes it go around This force always point to the center of the circle (F//a) Ball moving in a circular path on an horizontal plane . If we neglect air resistance, what are the forces act on the ball? Horizontal plane .- Tension- Centripetal force IMPORTANT : Centripetal force is NOT a separate force, it can be any of the forces we know (friction, tension, gravity, normal force, etc) acting in the role of a force that cause a circular motion. Tension is what causes the centripetal acceleration and makes the ball go around. F R N- Normal W- Weight perpendicular to the plane x Force diagram: Radial reference frame T N W y T = mv 2 / R N-W =0 x: y: (radial component) (perpendicular plane) F net = F centripetal Centrifugal force Is this all? Is this all?...
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This note was uploaded on 04/03/2008 for the course PHYSICS 7A taught by Professor Lanzara during the Spring '08 term at University of California, Berkeley.

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Lecture9 - Centripetal force Radial or Centripetal...

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