# The World of Physical Science

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The World of Physical Science
Chapter 1

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

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

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)

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

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

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)

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