1. How do Scientists Analyze and Predict Changes?

2. What is an Interface? Boundary where two regions come together.
Changes occur as one system transfers energy from one region to the next.

3. Measuring the Rate of Changes
Pull out the HANDY DANDY REFERENCE TABLES!!!! **Check the Front cover
Rate of Change =
Change in field Value Time
How fast something is occurring

4. What is the Temperature Change on Ms. V’s VERY IMPORTANT CUP?
Ex: If a cup of coffee has a starting temp of 93 ˚ F and 72 ˚ F after 20 mins have passed, what is the Rate of Change?
*** Change is just the difference (always subtract the Smaller # from the Larger #)
(93-72) ˚ F
20 mins
Ans: 1.1 ˚ F /min

5. How can Graphs Indicate Rate of Change
Slope (steepness) of the line shows the Rate of change
Steeper the Slope the faster the change.
What car takes longer to stop?

6. Constant Rate of Change
Same amount of change within the same time
Slope of the line doesn’t change (straight line)

7. Increasing Rate of Change
Slope increases
Blue Graph – Temp is increasing and Rate is increases (slope increases)
Red graph – Temp is decreasing at a faster rate

8. Decreasing Rate of Change
Slope decreases

9. Predictability of Changes
Data collected over long periods of time can be used to predict future changes.
Use the rate change formula to determine how fast change has occurred in the past to predict future events.
Extrapolate Data from graphs of past data.

10. Extrapolating Data to Predict Change
Observe Patterns and Extrapolate them further.
Ex: How much time is between each peak?
So when will the next peak occur?

11. What is Predictable? Cyclic Events that have repeating patterns
Ocean Tides
Sunrise and Sunset
Moon phases
Seasonal Temps

12. Events That are Less Predictable?
Individual occurrences that do not repeat are less predictable
Examples: Earthquakes
Volcanic Eruptions
Meteorite impacts