L14 - Remember:ThisWeek&Upcoming...

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Remember: This Week & Upcoming Finish reading Ch. 4 on Newton’s Laws & applicaAons. Begin Ch. 5 on circular moAon soon. Finish RecitaAon ±ssignments this week: Forces, Newton’s Laws, Free Body Diagrams. CAPA assignment #5 is due this evening at 10 PM, to be done on‐line. RecitaAon next week: Work & Energy. (± week early.) Mid‐Term 2 is coming up: Tues Mar 2. Covers Ch. 3‐5 – projecAle moAon, Newton’s laws for straight line and circular moAon. L14 F 2/12/10 1 Physics 2010

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L14 F 2/12/10 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
L14 F 2/12/10 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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L14 F 2/12/10 Physics 2010 4 Glider on an air-track tilted at angle θ . Find a and N ? Step 1: Draw a free-body diagram. Step 2: Choose a coordinate system. Step 3: Write down NII accurately. Step 4 : Solve for what you need. a x = a a y = 0 F x = mg sin θ F y = N mg cos ma x = ma = mg sin ma y = 0 = N mg cos a = g sin N = mg cos x y
L14 F 2/12/10 Physics 2010 5 The driver of a car parked on a hill releases the break and puts the car in neutral.

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This note was uploaded on 08/24/2010 for the course PHYS 2010 taught by Professor Dubson during the Spring '06 term at Colorado.

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L14 - Remember:ThisWeek&Upcoming...

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