PHYSICS 8A-08 (02-11-10)

# PHYSICS 8A-08 (02-11-10) - PHYSICS 8A Professor Joel Fajans...

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PHYSICS 8A Professor Joel Fajans 2/11/10 Lecture 8 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. LECTURE Recall that we talked briefly about circular motions last time. I was trying to explore what happens when I have something that goes around in a circle like this ball on a string. We calculated that to keep it going there was an acceleration on the ball. The speed is approximately constant, but the direction of the velocity is changing. This means there is an acceleration. We calculated that the acceleration is given by Sometimes you know the period T, where In those circumstances it is convenient to write acceleration in terms of the period or frequency. Typically, we will end up with some factors of . For example, for V velocity. So we define another version of the frequency, With this, we rewrite I can also rewrite So the velocity increases linearly with the distance out. If I have something accelerating as I spin it around, that must mean there are forces acting on it. I can feel this force—it is this force that I am holding the end of the string. If I let go, I am no longer applying a force on the ball, the ball will want to go outwards. Nothing will be keeping it going in a circle. is known as the

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## This note was uploaded on 04/29/2010 for the course PHYSICS 83840p3 taught by Professor Fajans during the Spring '10 term at Berkeley.

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PHYSICS 8A-08 (02-11-10) - PHYSICS 8A Professor Joel Fajans...

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