1. Scales of Measure SW measure in SI; determine the percentage of error

2. Look around the room How would you describe some of the objects that you see? The cabinet is about the size of the doorway. This description is not too useful. Wouldn’t it be better to measure the actual size? This lab will show how measuring physical properties will help you make better observations in an experiment.

3. Procedure Begin at any station and determine the measurement requested. Record the data in your chart and list anything that could create and error in your measurement Begin at any station and determine the measurement requested. Record the data in your chart and list anything that could create and error in your measurement Use a balance to determine the mass of a rock sample. Use a balance to determine the mass of a rock sample. Use a graduated cylinder to determine the volume of the weight. Use a graduated cylinder to determine the volume of the weight. Use 3 thermometers to measure the average temperature. Use 3 thermometers to measure the average temperature. Use a meter stick to measure the length of the back table. Use a meter stick to measure the length of the back table. Use a meter stick and a string to measure the circumference of the beach ball Use a meter stick and a string to measure the circumference of the beach ball

4. Analyze Compare your measurements with those of the other groups. How do your values compare? How do they compare with my values? Compare your measurements with those of the other groups. How do your values compare? How do they compare with my values? Determine your percentage of error using the following formula: Determine your percentage of error using the following formula: Your value – teacher’s value x 100 = % error teacher’s value teacher’s value

5. Conclude and Apply Generally being within 5%-7% of the correct value is considered good. Generally being within 5%-7% of the correct value is considered good. How close was your error? How close was your error? What could you do to improve your results and reduce error? What could you do to improve your results and reduce error? What was the most common source of error? What was the most common source of error?