Science & Measurement A. The Nature of Science * 1. Science is the total collection of knowledge gained by man’s observation of the physical universe.

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Science & Measurement A. The Nature of Science * 1. Science is the total collection of knowledge gained by man’s observation of the physical universe.

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Science & Measurement A. The Nature of Science * 1. Science is the total collection of knowledge gained by man’s observation of the physical universe.

B. Two main types of science 1. Pure science – attempts to gain new knowledge; discoveries; research. 2. Applied science (technology) is the use of science in practical ways. C. Physical Science 1. Chemistry – study of matter and the changes it undergoes. 2. Physics – study of energy & motion.

D. Scientific Statements 1. Facts – observable and indisputable. 2. Data – information gained from experimentation. 3. Laws – statements that describe patterns in nature with no known exceptions. 4. Theories – explanations based on evidence (may be wrong). 5. Models – man-made ideas to help us visualize scientific concepts.

E. The Scientific Method 1. Identify the problem (in the form of a question). 2. Gather information by research. 3. Form a hypothesis (an educated guess). 4. Experimentation. 5.Analyze data 6. Make a conclusion/ Results.

F. Scientific Experimentation 1. An experiment is a controlled test. 2. Only one variable should be changed at a time. a. Manipulated (independent) – changed by the experimenter. b. Responding (dependent) – the effect.

3. Constants do not change. 4. Controlled variables are those which could change, but are not allowed to. 5. Two parts to an experiment: a. Control group – normal conditions. b. Experimental group(s) – variables are changed.

G. SI - International System of Units 1. Based on multiples of Common metric prefixes: kilo- (k)1 000 x hecto- (h) 100 x deka- (da) 10 x BASE deci- (d)0.1 x(1/10) centi- (c) 0.01 x (1/100) milli- (m) x (1/1000)

H. Types of Measurements 1. Length a. The distance from one point to another point. b. Base unit is the meter (m). c. Tool is the metric ruler. 2. Volume a. The amount of space a substance occupies. b. Base unit is the liter (L). c. Tools: metric ruler for regular solids or graduated cylinder for liquids.

3. Mass a. The amount of matter in a substance. b. Base unit - gram (g). c. Tool is the balance. 4. Weight a. A measure of gravitational force on an object. b. Unit is the newton (N). c. Tool is the scale.

5. Time a. How long an event takes to occur. b. Unit is the second (s). c. Tool is the clock (stopwatch). 6. Temperature a. The amount of kinetic energy a substance has. b. SI unit is the Kelvin (K). c. Tool is the thermometer.