8/23/10

Post date: Aug 22, 2010 5:19:27 PM

  • Finish mystery tubes

    • revised models

    • additional data to support

    • what happens if new data disproves our theory?

    • a theory is the best explanation we can make with the data we have

    • laws are a different type of knowledge - a set of observations that ALWAYS occur in a given situation (Newton’s law of gravitation, Ohm’s law)

    • create a law related to tubes

    • THEORIES NEVER BECOME LAWS

  • Quiz

    • How do we know we have the right answer in science?

    • Describe the differences between hypothesis, theory, and law

  • Measurements

    • Are a form of observation

    • May provide evidence to help us formulate a theory

    • Accurate measurements help us make more accurate theories

    • Are based in time, distance, and mass

  • The SI system (the metric system)

    • Used everywhere except USA and Australia

    • Used in SCIENCE

    • Uses prefixes to make larger or smaller increments

    • Time (second) - related to frequency of radiation from Cs-133

    • Distance (meter) - distance traveled by light in a vaccuum in 1/ (299,792,458) seconds

    • Mass (kilogram) - mass of a platinum-iridium rod kept near Paris

  • Distances

    • How far between two points

    • Basic unit is the meter (m)

    • For small measurements, we use the centimeter (1/100th of a meter) or the millimeter (1/1000th of a meter)

    • For large measurements, we use the kilometer (1000 meters)

    • To measure distance, we can use meter sticks and rulers

  • Measurements and Graphing Lab

    • Due Tuesday, 8/23/10