1. How do we measure and describe the world around us?
1.1 Time and Distance
How do we measure and describe the world around us?

2. Key Points Different ways of thinking about time Measuring Units
English
Metric
Units

3. Time 2 ways: Measuring it: What time is it? How much time?
Years, months, weeks, hours, minutes, seconds
Which way is more appropriate to use in this class?
Which measurement will we use to measure time?

4. Converting Time Comes in mixed units Convert to seconds:
Separate into different units
Convert each unit into seconds
Add all of the seconds together

5. Conversion Example Remember: 60 min = 1 hour 1 min = 60 sec 1:26:31.25
26 minutes
31.25 sec
1 x 60 = 60
60 x 60 =
3600 sec
26 x 60 =
1560 sec
31.25 sec
= sec

6. Your Turn 2:37:14.02 1:59:57.81 0:02:16.09 9434.02 seconds

7. Distance Definition: Two systems: How far from one point to another
Measured in length
Two systems:
English
Metric
Which system will we use?

8. English Uses miles, yards, feet, inches
Not to scale
Talk about common conversions
Uses miles, yards, feet, inches
Each inch is broken into 16 pieces

9. Metric System
Uses kilometers, meters, decimeters, centimeters, millimeters
Each centimeter is broken into 10 pieces

10. Why Metrics? To compete with the rest of the world Easier
Only USA, Burma (Myanmar), and Liberia do not use the metric system
Restrictions are put on non-metric imports
Easier
Multiples of ten
It has been the official system in the US since 1893
It is based on a fraction of the circumference of the Earth - not a foot!

11. Metric Bases Meter Liter Gram Second Length or distance Volume
Mass (not the same as weight)
Second
Time

12. Metrics Multiply by 10 when moving down or to the right. Kilo- 1000
Hecto-
100
Deka- 10
Base Unit 1
Deci- .1
Divide by 10 when moving up or to the left.
Centi-
.01
Milli-
.001

13. Units To communicate Must be standard Science uses metrics
1 meter is roughly the height of a first grader
1 centimeter is roughly the width of your littler finger
1 millimeter is roughly the width of a pencil lead
Standard - everything is the same

14. Lab 1.1 Reminders Section 1: Section 2:
Each person needs to test and record their reaction time 3 times. From there you can get the average.
Section 2:
Read the directions carefully.
Number 4 includes a question. Don’t forget to answer it.
Be specific!
Specific refers to letters a and b.

15. Lab 1.1 Reminders Section 3: Section 4:
Make sure you answers are clear. Do not just write see above.
Section 4:
Read carefully and discuss these and you should be fine.
Be sure to include your reasons. Don’t forget to answer the why.

16. Lab 1.1 Reminders Section 5: Section 6 and 7:
Measure in cm (to the nearest tenth or mm) for a.
Measure carefully!
Section 6 and 7:
Be sure to go to the nearest tenth (or mm) for metrics and sixteenth for English.

17. Image Sources
English Ruler -
Metric Ruler -