1. The World of Physical Science
Chapter 1

2. Physical Science The study of matter & energy All matter has energy
Chemistry studies all forms of matter & how they interact
Physics studies energy & how it affects matter
Part of other scientific areas: Astronomy, Meteorology, Botany, Geology, Oceanography, Ecology, Biology

3. Scientific Method
Series of steps that scientists use to answer questions & solve problems
Ask a question
Form a hypothesis
Test a hypothesis
Analyze the results
Draw conclusions
Communicate results

4. Theories vs. Laws
Theories - unifying explanations for a broad range of hypothesis & observations that have been supported through testing (THIS IS NOT JUST A “HUNCH” OR “GUESS”)
Ex. Cell theory, Atomic theory, evolutionary theory
Laws - a summary of many experimental results and observations
Ex. Law of Gravity (Newtons’ Laws)

5. Models Representation of an object or system
Ex. Rocket, cell, globe, atom, maps, sheet music, equations
Allow you to test ideas without spending time and money to make the “real thing”
Used to illustrate theories and build scientific knowledge

6. Measurement
International System of Units (SI) - metric system; based on #10
Length - meter
Volume - liter (or cm3)
Mass - gram
Temperature - celsus or Kelvin
Kilo--> BASE UNIT --> centi --> milli
LARGE > SMALL

7. Calculations Area (cm2) = length (cm) X width (cm)
Volume (cm3) = length (cm) X width (cm) X depth (cm)
* for a solid use cm3
* for a liquid use mL
* use the displacement of a liquid an irregular shaped object is placed in (Ex. The peanut butter cookie recipe!)
Density (g/cm3 or g/mL) = mass (g)/volume (cm3 or mL)