2. Physical Science and You Chapter One: Studying Physics and Chemistry Chapter Two: Experiments and Variables Chapter Three: Key Concepts in Physical Science

3. Chapter One: Studying Physics and Chemistry 1.1 The Physical Science in Your Life 1.2 Time and Length 1.3 Inquiry and the Scientific Method

4. Investigation 1B How are time and distance measured and described in physical science? Measuring Time and Distance

5. 1.2 Time and Length Time has two important meanings. –What time is it? –How much time?

6. 1.2 Units of Time Units for time include: –seconds –minutes –hours The second is the basic unit of time in both the English and metric systems.

7. 1.2 Mixed Units Time is often expressed in mixed units. This timer shows the time for a race as 2 hours, 30 minutes and 45 seconds.

8. 1.2 Mixed Units A microwave oven can program time in either mixed units (minutes and seconds) or in a single unit (seconds). How will 1:30 and 0:90 will result in the same cooking time?

9. 1.2 Length and Distance Distance is the amount of space between two points. Distance is measured in units of length.

10. 1.2 Length and Distance Some of the commonly used units of length include inches, feet, miles, centimeters, kilometers, and meters.

11. 1.2 Length and Distance The names of units in the metric system are based on multiplying by ten. Almost all fields of science use metric units because they are easier to work with.

12. 1.2 Measuring Length For ordinary lengths you must measure in the laboratory a meter stick is the most convenient tool to use. For very small lengths, such as the size of a bacteria, scientists use measuring instruments that fit into a microscope.

13. 1.2 Measuring Length The micron (μ) is a very tiny unit of length, appropriate to measuring tiny living creatures like bacteria.

15. 1.2 Converting between units In order to convert between units, we use conversion factors. A conversion factor is a ratio that has the value of one.

17. Activity A clock is a tool used to measure time. Inside a clock are parts that move with a constant repetition. Make a Water Clock