Lect7-ch5_2 - L7Ch5 Spring 2004 PHY 2053C College Physics A...

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1 Spring 2004 PHY 2053C: College Physics A Today: Dynamics: of Circular Motion, Gravity Circular Motion Newton’s Law of Universal Gravitation Satellites & “Weightlessness” Mot i on , For c e s, Energy , Heat , Wave s Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle L7—Ch5 Rem i nder: Block on inclined plane A block is at rest on an inclined plane μ S =0.42, μ K =0.15 At what ang l e does the b l o c k start to s li de ? What i s the a cc e l erat i on ? Free Body D i agram Solution: (We will see that mass m does not matter.) Notice x- and y-axis ! a) Find the x- and y- components of weight F G b) Find the unknown friction force c) Starting to slide: F Gx F Gy F Gx mg sin F N F Gy mg cos F fr S F N S mg cos F Gy mg cos F fr F Gx S mg cos mg sin => S tan q
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2 whenever an obje c t ex c ert s a for c e on a se c ond obje c t , the se c ond ex c erts an equa l and oppo s i te for c e on the f i rst . Action and Reaction forces always act on different objects ! (we swap the ro l es o f obje c t and wor l d !!) Newton’s Third Law of Motion : Rem i nder: Question 1
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3 Imagine an object moving on a circular path with constant speed. Although the speed (length of v) is constant , the velocity is changing all the time. The acceleration is pointing toward the center, with constant magnitude.
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