phy2048 lecture11

phy2048 lecture11 - : Astronaut in Circular Orbit ? and...

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Midterm #1 Average 48/75 (64%) Midterm Exam #1 0 5 10 15 <30 30's 40's 50's 60's 70's
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6-1 What Is Physics?  6-2 Friction 6-3 Properties of Friction 6-4 The Drag Force and Terminal Speed 6-5 Uniform Circular Motion Chapter 6: Force and Motion – II Chapter 6 Homework 1, 7, 11, 17, 25, 29, 34, 41, 47, 55, 58, 60
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Uniform Circular Motion A centripetal force accelerates a body by changing the direction of the body’s velocity without changing the boby’s speed. r v a 2 c = r v m F 2 c = F c points from the rotating body to the rotation center. F c is not a new kind of force. It’s simply the net force that causes centripetal acceleration.
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Examples: Uniform Circular Motion Sample Problem 6-6
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Unformatted text preview: : Astronaut in Circular Orbit ? and Find kg. 79 km/s, 6 . 7 km, 520 g c F a m v h = = = contact? in remain to top at the speed least the Find m. 7 . 2 = R Sample Problem 6-7 : Bicycle in Loop-the-Loop Flat and Banked Curves Sample Problem 6-9 : Negative Lift mg f R v m F s s = = = max , 2 c When a car moves around a flat curved road, the necessary centripetal force is provided by friction. gR v s 2 = Banked road allows cars to negotiate curves even without friction. Examples: Banked Curves Problem 53 : Circling Airplane Sample Problem 6-10 : Banked Curve gR v 2 tan = L mg a c...
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phy2048 lecture11 - : Astronaut in Circular Orbit ? and...

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