What is Science?

•Science is a system of knowledge based on facts and principles

Biology

•Is the Science of Life!

•It deals with organisms-better known as an individual living things

How does all of this take place?

By Observations • Scientist make observations using their senses and technology.

• Sometimes the technology does not exist to make the needed observations.

What is Technology?

Technology •

Technology

is the application of science to meet human needs.

Scientist investigate

Scientist Observe • Paying close attention to details scientist look for connections and patterns in nature.

Scientist also Experiment • Using

Scientific law

• Using

Scientific Theory

Scientific law is a summary of an observed natural event Scientific theory is a tested possible explanation of a natural event

Make-up of Scientific Theory

Scientific Theory must: • Explain observation simply and clearly.

• Experiments must illustrate the theory and be repeatable.

• Be able to predict from the theory.

Make-up of Scientific Law • Laws just summarize observations about nature or a natural event. • Laws do not explain how or why something happens.

Models

Critical Thinking • Applying logic and reason to observations and conclusions.

Scientific Method

Problem

To solve the problem • • You ask a question.

• You may gather data.

• You form a

hypothesis

; a possible answer that you can test in some way. Usually a “if” , “then” statement ..\Power Points Sem 1\Hypothesis.ppt

Testing Hypotheses • Scientist test hypothesis by doing experiments.

• Good experiments test only one time.

variable

at a

Variable

is anything that can change in an experiment.

(Many variables exist in this picture.)

The Way Science Works

What is an experiment?

• the act of conducting a controlled test or investigation • the testing of an idea; "it was an experiment in living"; "not all experimentation is done in laboratories" • to conduct a test or investigation; "We are experimenting with the new drug in order to fight this disease" • a venture at something new or different; "as an experiment he decided to grow a beard"

What is a control?

• control condition: a standard against which other conditions can be compared in a scientific experiment; "the control condition was inappropriate for the conclusions he wished to draw" • determining all factors that can affect the outcome of an experiment, and setting all those factors the same except for the

one factor

that is varied.

THEORIES - Explain

In Science, a Hypothesis is the explanation for the events that have been observed. Scientists create hypotheses to try and explain the observed behavior of the world. They do so by creating an explanation that can be tested (an hypothesis). If a lot of evidence (data) is collected to support the hypothesis, then scientists accept the hypothesis as a good explanation, and it may, given even more testing, become an accepted theory.

Quick Review • Scientific Method- a system of asking questions, developing explanations, and testing the explanations • Hypothesis- a possible explanation of a problem or question • Experiment- a controlled test • Control- part of the experiment not being tested and is used for comparison • Variable- any part of the experiment that can change • Theory- logical explanation of an observation

How does it measure up?

Units of Measurement • There was a need for a common language for science and that language is math and it is named the International System of Units or SI.

SI Base Units

Important Quantities

• Length • Mass • Volume • Weight

Scientific Notation

Scientific Notation basics: