2.2.4 Moon's Pull and Tides

Multiple Choice

2 Truths and a Lie…

Which of the following is the lie?

• The Moon has Moonquakes

• The Moon is shrinking

• Earth's gravity is pulling the Moon closer

The extra pull of the tides is dragging the moon away from the Earth. Similar to if you are sitting on a "roundabout"-- the faster it spins, the more you feel slung outward.

More info: Due to the rotation of the Earth, this tidal bulge actually sits slightly ahead of the Moon. Some of the energy of the spinning Earth gets transferred to the tidal bulge via friction.

This drives the bulge forward, keeping it ahead of the Moon. The tidal bulge feeds a small amount of energy into the Moon, pushing it into a higher orbit like the faster, outside lanes of a test track.

Moon is getting farther away

Multiple Choice

Overall, which has a stronger gravitational pull (The Moon or the Sun)?

Then-- let's talk about WHY.

• The Moon

• The Sun

​WHY?

​

​hmm....

Poll

Would you rather…

• Have 6 hrs in a day

• Have 24 hrs in a day

• Have 36 hours in a day

Multiple Select

Which of the following is influenced by the gravitational pull of the Moon?

Select TWO.

• Earth's Rotation

• Earth's Seasons

• Earth's Revolution

• Earth's distance from the Sun

April 1
High tide = 3.9
Low tide = 1.8
Difference = 2.1

April 20
High tide 5.0
Low tide 0.6
Difference = 4.4

Just another view of tides and moon phases.
(From: National Oceanic and Atmospheric Administration)

Earth rotates, so when the moon is in line with the ocean or on the complete opposite, water level is high. Low tide is when moon is at 90 degree angle from that location.

Multiple Choice

What is the name given when High tides are at their highest and low tides at their lowest?

• Neap tide

• Spring tide

• Tide pods

• Lunar levels

Videos on next two slides.

Multiple Choice

Why does the sun only play a MINOR roll in the tides?

• The Sun has no gravitational force

• Trick! The Sun has NO roll in the tides.

• The distance between the Sun and Earth is much larger compared to the Earth and Moon distance.

• The Sun has too much heat to affect a water source.

Match

Match the following description to the corresponding term.

• Periodic rise and fall of water; regular; caused by the Moon

• Happens during New and Full Moon

• Happens during First and Third-quarter Moon (90 degree angle)

• Affected mostely by wind; not regular.

tides

Spring Tides

Neap tides

waves

• tides

• Spring Tides

• Neap tides

• waves