Physics is the study of the behavior of matter and energy in the world around us. What is Physics?

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Presentation transcript:

Physics is the study of the behavior of matter and energy in the world around us. What is Physics?

See Table 1-1 for Fields of Physics Mechanics Thermodynamics Vibration and Waves Optics Relativity Quantum Mechanics

The Scientific Method Identify the problem. Create a hypothesis. Test the hypothesis. Observe data and make conclusions. Create a new hypothesis or test until you create a theory.

Controlled Experiments Experimental variables. Control. Laws and theories

Other Physics terms Model

Measurements In Experiments Numbers as Measurements Always include dimensions or units SI units are the standard for science. Learn your SI prefixes on p 12. See Sample Problem 1A page 14.

Accuracy and Precision Accuracy is how close you are to the real measurement. Precision is how close your measurements are to each other.

Significant Figures Significant figures are decimal places that are accurate… zeros can be place holders or significant figures… non-zero numbers are always significant figures. Use the Atlantic Pacific rule to determine significant digits. Report 1 more decimal place beyond the finest units on your measuring device.

Significant Figures Version Number 1 Rule #1: All non-zero digits are significant. Rule #2: Zeros in front of a number are not significant. Rule #3: Zeros between non- zero digits are significant. Rule #4: Zeros at the end of a number are significant if there is a decimal point in the number. Version Number 2 Use this diagram to help determine the number of significant figures in a measured value… Pacific | Map of US | Atlantic If the decimal point is present, start counting digits from the Pacific (left) side, starting with the first non-zero digit (4 sig. figs.) If the decimal point is absent, start counting digits from the Atlantic (right) side, starting with the first non-zero digit. 31,400 ( 3 sig. figs.) Examples 2,300 2 sd sd 300 1sd sd