Physics Chapter 1 Goals: Physics, subjects, scientific method and measurements, use concepts to write equations

What is Physics? Physics is the study of the interaction of matter and energy Explains the physical world from the motion of subatomic particles to the structure of the universe Quantum Mechanics to energy and forces of large objects Fundamental forces – strong, weak, electromagnetic and gravity Many applications from inventions to engineering

What are the branches of Physics? Mechanics – motions of larger objects speed force acceleration momentum work Thermodynamics – heat and temperature Vibrations and Waves – reflection, refraction, diffraction and interference Optics – lenses and mirrors Electromagnetism – light, electricity and magnetism Relativity – particles at the speed of light Quantum Mechanics – subatomic particles

How do we solve problems in Physics? Scientific Method – systematic way of solving problems Observation Information Hypothesis Experiment – independent variable, dependent variable, constants and control Collect Data – measurements Conclude

Measurements Have a value and unit Consider accuracy and precision Value in correct number of significant figures indicates precision zero between digit are significant 110.001 zero to right or end are significant 1.0700 zero to left of decimal are not 47000 Zero in front of nonzero digits are not .008 Values should be in scientific notation

Units include: grams, meters, seconds, Kelvin, Newtons, Watts, Pascals, calories, Coulombs, MeV, Hertz, volts and Teslas Prefixes include: 10ֿ9……………nano 10ֿ6…………….micro µ 10ֿ3………………milli 10ֿ2………………..centi 10 3…………………..kilo 10 6……………………..mega 10 9………………………….giga

To convert units use dimensional analysis 1. Take number given 2. multiply by conversion factor 3. cancel units ex: convert 37.1 µg to grams 37.1 µg x 1000000µg/g or 1g/ 1000000µg 37.1 µg x 1 g / 1000000µg = .0000371g cancel units

Try to think of just one object or system that does not involve Physics…….. Huh Proponderous isn’t it ? You can’t think of anything can you? I can But………. It is out of this World