# L17 - Remember:ThisWeek...

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Remember: This Week Read Ch. 5 on circular mo8on: 5.1, 5.2, 5.6, 5.7, 5.±, 5.9. Lab 2 this week : “Accelera8on due to gravity”. Do Pre‐Lab on‐line, print and bring to lab sesssion, then print Lab 2 and bring that to lab session. CAPA assignment #6 is due this evening at 10 PM, to be done on‐line. Mid‐Term II is coming up fast. Blank and Solu8ons versions of the exam from last Spring are on CULearn. L17 F 2/19/10 1 Physics 2010

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L17 F 2/19/10 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
L17 F 2/19/10 Physics 2010 3 Dynamics: Newton’s Laws of Motion Applications: (1) Sliding Blocks. (2) Contact Forces. (3) Suspended Bodies. (4) Friction.

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L17 F 2/19/10 Physics 2010 4 Example 3. A block of mass m slides down a rough ( μ K ) incline tilted at an angle θ from the horizontal. What’s the magnitude of a ? N a F g = -mg θ θ y: F y = 0 = N mg cos θ N = mg cos x: F x = ma = mg sin + f = mg sin θ− μ K N = mg sin K mg cos a = g (sin K cos ) mg sin θ -mg cos θ +x +y f = - μ K mgcos θ
L17 F 2/19/10 Physics 2010 5 Example 3. A block of mass m slides down a rough ( μ K ) incline tilted at an angle θ from the horizontal. What’s the magnitude of a ?

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L17 - Remember:ThisWeek...

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