lecture1B

# lecture1B - Physics 1A Lecture 1B "I imagine good teaching...

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Physics 1A Lecture 1B "I imagine good teaching as a circle of earnest people sitting down to ask each other meaningful questions. I don't see it as the handing down of answers. So much of what passes for teaching is merely a pointing out of what items to want." --Alice Walker

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Standards/Units Last time we said that Physicists study objects that range from enormous (galaxies) to microscopic (quarks). In order to measure objects you need to have a standard to compare things. There are three basic quantitative measurements: Time, Length, and Mass Every measurement we will make in this class can be broken up into these base quantities. For example, velocity can be broken up into Length over Time.
Standards/Units The most prevalent standard of units in the world is the SI unit. Here: Length [L] => meters (m) Mass [M] => kilograms (kg) Time [T] => seconds (s) Other unit systems? English => [feet, slugs, seconds] Gaussian => [centimeter, grams, seconds]

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Standards/Units The obvious advantage of using the SI units is that different units increase by power of tens. It is much easier to remember that there are 1,000 mL in 1 L instead of 4 gills in 1 pint. Become familiar with common preFxes, such as: micro => 10 -6 milli => 10 -3 centi => 10 -2 kilo => 10 3 Mega => 10 6
Combining Measurements Each measurement is a number multiplying a unit. => To add two measurements both have to

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## This note was uploaded on 04/09/2009 for the course PHYS 1A taught by Professor Onuchic during the Winter '07 term at UCSD.

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lecture1B - Physics 1A Lecture 1B "I imagine good teaching...

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