1. Gravity and Tides Lesson 16
Up and Down, In and Out
Gravity and Tides
Lesson 16

2. Making sense of the tide table:
Find the highest tide within the two weeks.
Find the lowest tide within the two weeks.
What do the high tide and low tide numbers mean?
Find the day with the Full Moon Phase.
Find the day with the New Moon Phase.
How many high tides per day?
How many low tides per day?

3. Why are tides important?
You live in the Northwest. Do you like to explore the following bodies of water?
Puget Sound
Pacific Ocean
If so you need to know about tides.
What about Lake Washington????
Beach scenario:
On Memorial Day (5/30) you and your family are planning a trip to Alki Beach (across from Seattle) to have a sandcastle building contest.
What time of day will you want to have your competition?

4. Sea Stacks

5. 2How many tides per day? (Pg. 256)
Top View
Two high tides per day (positions A and C)
Two low tides per day (positions D and E)

6. Spring and Neap Tides (Pg. 257)
Two spring tides per month (New and Full Moon)
Two neap tides per month (1st and 3rd Quarter)

7. Let’s take a look at the data:

8. Ebb, Flood and Slack
Ebb Tide/Current: When the water is going out (the water level is going down).
Flood Tide/Current: When the water is coming in (the water level is rising).
Slack Tide/Water: When the water stops for just an instant and turns around (occurs at high tide and low tide).

9.  Not to Scale Tidal Bulge Earth Moon Moon’s Pull on Water Sun
Moon’s Pull on Earth
Sun
Sun’s Pull on Water