Lect7-ch5_2

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

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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 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 o k start to s li de ? What s the a cc erat on Free Body D 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 cos F fr S F N S F F F S sin => S t an q
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2 whenever an obje c t ex ert s a for e on a se ond obje t , the se ond ex erts an equa l and oppo i te for on the f rst . Action and Reaction forces always act on different objects ! (we swap the ro es o obje and wor d !!) Newton’s Third Law of Motion : Rem 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. We call this , “center-aiming acceleration” Uniform Cirular Motion v 1 v 2 R v 1 v 2 v 2 v 1 Δ v =v 2 -v 1 a a v t v 2 v 1 t 2 t 1 a v 2 R centripetal acceleration Notes on Circular Motion The centripetal acceleration points toward the center of the circle.
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Lect7-ch5_2 - L7Ch5 Spring 2004 PHY 2053C: College Physics...

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