Chapter6 - PHYS276, S09 Chapter 6 1 Chapter 6 Demos:

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Unformatted text preview: PHYS276, S09 Chapter 6 1 Chapter 6 Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm D1-35: centripetal force rotating mass C4-32: free fall in vacuum C4-43: terminal velocity stacked coffee filters C4-41: terminal velocity bottle in tube D1-33: rotating mass on string Thanks to Prof LaPorta and Peer Instruction by Eric Mazur Chapter 6 PHYS276, S09 Chapter 6 2 Short chapter more on circular motion resistive forces will skip sections 6.2,6.3, Chapter 6 Circular Motion For uniform circular motion we previously derived Newtons second law implies that a force must be applied to maintain this motion F = a c = mv 2 r direction: inward towards the center of the circle This allows us to determine the orbit that would be produced by a given force, or to find the force implied by an orbit at a given speed and radius. Direction: inward, towards the center of the circle when I spin twice as fast, the force registered will increase by a factor of 1. 1 2. 2 3. 3 4. 4 Test Yourself Demo: D1-35 A scientist in the international space station is weightless because she has escaped the gravitational field of the earth 1. True 2. False 3. Sort of The scientist is definitely under the pull of gravity, that is what is keeping her in orbit. She is essential in free fall, but since her environment is falling at exactly the same rate, it appears to her that she has no weight. Put another way, if we are on the space station we are observing her from within a reference frame which is also falling with the acceleration of gravity....
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Chapter6 - PHYS276, S09 Chapter 6 1 Chapter 6 Demos:

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