Physical Science Review #1 Lecture * You might want to take your own notes if you have lost your own

Test Format Regular Physical Science 60 multiple Choice ~40 concept questions ~20 math questions Honors Physical Science 70 multiple choice 45 concept 25 math

Scientific Method Not a set series of steps because you can always go back if a step doesn’t work All experiments include: Problem Background research Hypothesis Procedure Data Results Analyzing Conclusions Report

Hypothesis vs Theory vs Law an educated guess based on background research Able to be disproven but not proven Theory A hypothesis that has been tested many times Tells WHY something happens Law Tells you what will happen because of a theory

Independent vs Dependent Variables Independent variable What you manipulate in the experiment (ex. The time) Dependent variable What you measure in response to the independent variable Depends on Independent Variable (ex. The temperature) Constant/Control What stays the same (the amount of ice)

Accuracy vs Precision Accuracy Precision How correct your answer is How many times you can repeat the same measurement

Metric System Gram Liter Meter 103 102 101 100 10-1 10-2 10-3 kilo- hecta- deka- BASE deci- centi- milli-

King Hector Died By Drinking Chocolate Milk

Examples 350 kg __________g 0.448 g____________cg 2356 mm___________m 275 dL_____________mL 150 dag______________hg

Scientific Notation To convert: __.__ ___ x 10 If the number is greater than 1; positive exponent If the number is less than 1; negative exponent. Move from the decimal (or from the far right if there isn’t one)

Examples 35000 __________ 0.00448 ____________ 2356 ___________ .0000275 _____________ 157856 ______________

Standard Form If the exponent is positive move that many times to the right from the decimal If the exponent is negative move that many times to the left from the decimal

Examples 3.75 x 105 8.29 x 103 5.91 x 10-2 3.25 x 10-4 4.78 x 101

Dimensional Analysis & Train Tracks Always make your train track first Always start with what’s given in the problem Use your conversion factors to help get where you need to go Multiple all the top, divide by all the bottom

Examples Convert 195 inches into centimeters (1 in=2.54 cm) Convert 476 minutes into seconds (1 minute=60 seconds) Convert 85 feet into meters (1 ft=12 in, 1 in=2.54 cm)