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Links:
Physics B AP Curriculum Page
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Concepts:
When an object is moving in a circle about a central point, a force acts at right angles to the tangential motion of the object and toward the center of the circular path. The force is centripetal force, and is directly proportional to the square of the object's speed.
Summary:
Students observe the trajectory of a circling puck released on an air table, analyzing its behavior. They analyze the forces acting when they twirl a stopper using a tube device. A parabolic graph of applied force versus speed is produced when radius and mass are controlled.
Objectives Links:
I. E. Circular motion and rotation
Process Skills Checklist
Equipment:
- various masses
- string
- narrow glass or metal rod, approximately 6" long
- rubber stopper
- Demo: air table, puck, fishing line
Safety Concerns:
The mass and stopper must be securely tied, or the equipment may unexpectedly enter projectile, not circular, motion and cause injuries.
Revision Date:
June 2004
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