# L18 - Remember:ThisWeek...

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Remember: This Week Read Ch. 5 on circular mo8on & gravity: 5.1, 5.2, 5.6, 5.7, 5.±, 5.9. Recita’on #4: Work & energy. Print Recita8on Assignment and bring to Recita8on sec8on. CAPA assignment #7 is due Friday evening at 10 PM, to be done on‐line. Mid‐Term Exam II: next Tuesday at 7:15 PM here and next door. Last half of Ch. 3.5‐3.6, Ch. 4, & Ch. 5. L1± M 2/22/10 1 Physics 2010

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L18 M 2/22/10 Physics 2010 2 Dynamics: Newton’s Laws of Motion Newton’s Laws hold in an “Inertial Reference Frame”. I. “Law of Inertia”: Every object continues in its state of rest, or uniform motion (constant velocity in a straight line), as long as no net force acts on it. II. Acceleration is proportional to force and inversely proportional to mass : III.Whenever one object exerts a force on a second object, the second exerts an equal force in the opposite direction on the ±rst: F  net = ma F AB = F BA
L18 M 2/22/10 Physics 2010 3 Ch. 5: Circular Motion; Gravitation Sections: 5-1. Kinematics of Uniform Circular Motion 5-2. Dynamics of Uniform Circular Motion 5-6. Newton’s Law of Universal Gravitation 5-7. Gravity Near Earth’s Surface 5-8. Satellites and “Weightlessness” 5-9. Kepler’s Laws and Newton’s Synthesis.

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L18 M 2/22/10 Physics 2010 4 Kinematics of Uniform Circular Motion Velocity vector constantly changing direction but not magntitude. Speed is constant = . Change of direction acceleration. Acceleration is towards the center of the circle: centripetal acceleration ”. Has magnitude a R = v 2 /r . Could describe motion in two natural frames: The frame of the ball – but not an “Inertial Frame”. A fixed frame from which the ball is observed. v = | v |
L17 F 2/20/09 Physics 2010 5 Example 1. A ball of mass m at the end of a string is revolving uniformly in a circle of radius r . The ball takes τ seconds to complete one revolution. What is its centripetal acceleration?

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L18 - Remember:ThisWeek...

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