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# L05a - Physics 111 Lecture 5a"Fig Newton The force required...

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1 / 8 Physics 111 Lecture 5a “Fig Newton: The force required to accelerate a fig 39.37 inches per second.” –J. Hart

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Uniform Circular Motion Circular Motion Planets Question Banked curves Vertical Circular Motion Question 2 / 8 When a particle moves in a circle of radius R at a constant speed v , it experiences a centripetal (center-seeking) acceleration a c = v 2 R (1) vectora c points towards the center of the circular trajectory Centripetal acceleration is usually caused by more than one force (a net force) F c = ma c = m v 2 R (2) Without such net force, there is a tendency to move in a straight line (inertia)
Uniform Circular Motion Circular Motion Planets Question Banked curves Vertical Circular Motion Question 3 / 8 vector F c also points towards the center of the circular trajectory vector F c is not a new kind of force (not included in GWNTF ) Demo: Ball attached to a string. The tension of the string causes the centripetal force Example: A 3 . 0 -kg ball is attached to a 0 . 15 m string.

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