Lecture4 - To be continued Newton's Second Law Applied to...

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Unformatted text preview: To be continued Newton's Second Law Applied to Uniform Circular Motion The force causing centripetal acceleration is sometimes called a centripetal force. Please note that centripetal force is not a new kind of force. Non-uniform circular motion When the force acting on a particle moving in a circular path has a tangential component, the particles speed changes. The total force is What happens if we have non-inertial frame of reference? It means the frame of reference is accelerating. Fictitious forces the Coriolis force the centrifugal force Read it in details in the chapter 6 The centrifugal force The Coriolis Force Lecture #4 1. Work and Power 2. Nature of Energy 3. Kinetic Energy, Potential Energy 4. Energy conservation 5. Conservative and Yultuz Omarbakiyeva 27.09.2010 System model Yultuz Omarbakiyeva 27.09.2010 Force approach (Newtons laws) Energy approach (Conservation of energy) are independent approaches particle model system model single object or particle a collection of objects or particles a region of space vary in size and shape Work done by a constant force Yultuz Omarbakiyeva 27.09.2010 Work is energy transferred to or from an object by a force acting on the object. If = 0 --> W = Fr if = 90 --> W = Work is a SCALAR : the product of 2 vectors The unit of work is JOULE Energy transferred TO the object is positive work Energy transferred FROM the object is xf xi What if the force const ? i.e F depends on x: F(x) Move a distance x w = F(x). x = f i x x x x F w ). ( In the limit as x = f i x x dx ). x ( F w F(x) F x How much work is done by F in moving object from xi to xf? Work is the area under the F-x curve Yultuz Omarbakiyeva 27.09.2010 Yultuz Omarbakiyeva 27.09.2010 Spring Force x Fs Work = area of this triangle! Hookes law Spring constant Work done by spring force If the block undergoes an arbitrary displacement from x = xi to x = xf , Power Power is the rate of doing work If we do work W in a time t dt dW t W p t limit inst = = t...
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This note was uploaded on 10/15/2011 for the course PHYSICS 0207239 taught by Professor Mamar during the Spring '09 term at Jordan University of Science & Tech.

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Lecture4 - To be continued Newton's Second Law Applied to...

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