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PHYSICS

PHYSICS. Tuesday, 1/13/09 PHYSICS. “We teach people how to treat us.” Cesar Millan The Dog Whisperer. Tuesday, 1/13/09 PHYSICS. 1) Define ‘centripetal.’ 2) For an object moving at a constant velocity to turn a net force must be applied ___________ to the direction of motion.

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PHYSICS

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  1. PHYSICS

  2. Tuesday, 1/13/09 PHYSICS “We teach people how to treat us.” Cesar Millan The Dog Whisperer

  3. Tuesday, 1/13/09 PHYSICS 1) Define ‘centripetal.’ 2) For an object moving at a constant velocity to turn a net force must be applied ___________ to the direction of motion. toward the center perpendicular p. 258 #2 A young boy swings a yo-yo horizontally above his head so that the yo-yo has a centripetal acceleration of 250m/s². If the yo-yo’s string is 0.50m long, what is the yo-yo’s tangential speed?

  4. ex. A 50.0g model plane is flown in a circular path at the end of a 10.0m long string. If the string is horizontal and exerts a 1.65N force on the person holding it, what is the speed of the plane? (Hint: Choose inward [centripetal] as the positive direction.)

  5. UNIFORM CIRCULAR MOTION (UCM) An object moves in a circle at a constant speed. This is the simplest circular motion. However, if you look at just one moment of ANY circular motion you can ignore the tangential part and just work the centripetal part!! ex. 90kg Tarzan standing on a branch 4m above the ground grabs a 20m long vine that is attached to a branch 20m above the ground and swings down. Find the tension in the vine at the bottom of the swing.

  6. HW 32:p. 236/ 1, 3, p. 238/ 1, 2, 4(“tangential” speed)

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