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# Lec-01 - PARAMETERS DIMENSIONS AND UNITS Learning...

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1 [©2008 RJ Bieniek] P ARAMETERS , D IMENSIONS , AND U NITS Learning Objectives After you complete the homework associated with this lecture, you should be able to: Estimate the order of magnitude of physical quantities. Correctly specify the number of significant figures (digits) appropriate for numerical answers. Use unit analysis to convert from one set of units to another and determine the plausibility of answers. 2 [©2008 RJ Bieniek] Parameters in Physics Problems A parameter in a physical problem is, in this course, defined to be "a physical quantity that can conceivably be varied within a given physical situation". Examples are: ( an object’s mass ( an object’s length, width, or height ( the time an event occurs ( the force pulling or pushing an object N N OTE OTE : The mass of the Earth is a parameter in a gravitational problem because one could conceivably "modify" it. 3 [©2008 RJ Bieniek] Solving in Terms of Physical Parameters You’ll frequently be asked to express a physical quantity terms of "relevant parameters" in a problem.

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Lec-01 - PARAMETERS DIMENSIONS AND UNITS Learning...

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