DAILY QUESTION September 3, What instruments were used in Italy in the 1600s to study weather? (Hint: Use your book to help you!)

AGENDA9/3/08 Daily Question Correct Sect. 2 Directed Reading Wksht Sect. 2 Notetaking Worksheet Assignments: 1. Foldable with terms due 9/4 2. Sect. 2 Reinforcement pg. 26 Wksht due 9/43. Study for Test on Friday

Scientific Theory Is an explanation or model backed by results obtained from many tests or experiments A hypothesis can become a theory if over a long period of time the hypothesis is supported by many experiments

Dr. Whipple’s “Dirty Snowball” Before 1949, people thought comets were swirling clouds of dust. In 1949, Dr. Whipple hypothesized that the nucleus of a comet contains practically all of a comet’s mass and consists of ice and dust. When it close to the Sun, the ice vaporizes and releases dust and gas that becomes the comet’s tail. It wasn’t until Halley’s comet was studied in 1986 that gave enough support of Dr. Whipple’s hypothesis that it finally became a theory.

Scientific Law Is a rule that describes the behavior of something in nature

Sir Isaac Newton Sir Isaac Newton wrote the laws of motion in his work titled Philosophiae Naturalis Principia Mathematica that was published in He used his laws of motion to explain many results concerning the motion of physical objects.

Limits of Science Science can not answer all the questions and problems in the universe. For a questions or problem to be scientifically studied, there must be variables that can be observed, measured, and tested.

Ethics Deals with moral values about what is good or bad. Ethical Questions “Do humans have more value on Earth than other life-forms?” “Should animals be used in medical experiments?”

Bias Your personal opinion Can affect the outcome of your experiment if you do not design your experiment to be objective What are some other jobs, besides scientists, that the person should remain objective?

Fraud The opposite of ethical behavior Making up data Changing results Taking credit for other scientists’ work

Chapter 1 Vocabulary Bias Constant Control Dependent variable Earth science Ethics Hypothesis Independent variable Science Scientific law Scientific method Scientific theory Technology Variable