Chapter 1 Science & Measurement

Time A useful measurement of changes in motion or events; all or parts of the past, present, and future Identifies a particular moment. Interval between a beginning and an end. In lab, we’ll measure it in seconds. A timer separates hours, minutes, & seconds using a colon (:).

Distance Length of space between two points. How far from one position to another. English system units –Inches, feet, miles Metric system units –Millimeters, centimeters, meters, kilometers

Scientific Method Experiment: any situation set up to observe and measure something happening Measurement: the act or process of measuring in multiples of a specific unit Process that leads to a reproducible answer Scientific evidence: an observation that can be repeated with the same result.

Scientific Method (2) Ask a question Formulate a hypothesis Design & conduct an experiment Collect & analyze data Draw a conclusion Test the conclusion

Scientific Method (3) Hypothesis: a prediction that can be tested by experimentation Variable: factors that affect the result of an experiment. Experimental variable: the variable you change. Control variables: variables you keep the same

Scientific Method (4) Experimental technique: how you actually do the experiment Procedure: a collection of all the techniques you use to do an experiment.

Speed Describes the movement from one place to another over time. Calculated value of distance traveled divided by the time interval to get there. English System units: –Miles per hour (mph), feet per second (fps) Metric System units: –Meters per second (m/s) –kilometer per hour (Km/hr)