Biggest ocean waves of all Topic 7: Tides Biggest ocean waves of all

Types of Tides Tides are a combination of the solar and lunar tides (remember wave interference) Solar tide – tide caused by the sun Lunar tide – tide caused by the moon High tide- crest at shore Low tide- trough at shore Tide range- distance between high & low tide Ebb tide- tide going out Flood tide- tide coming in

5 Factors That Cause Tides Gravitational pull of the moon Gravitational pull of the sun Centrifugal force of earth as it rotates Position of the sun & moon Angle of orbit of moon around earth

Gravitational Pull of the Moon Moon produces a tide by exerting a gravitational force on the earth Gravity – force of attraction between two bodies Draws moon and earth toward each other Centrifugal force keeps moon and earth from colliding Fg(moon) ocean earth Fc(earth)

Gravitational Pull of the Sun Sun produces a tide by exerting a gravitational force on the earth moon Fg(moon) ocean earth sun Fg(sun) Fc(earth)

Lunar and Solar Tides Gravitational pulls from the sun and moon each create an ocean tide Lunar and solar tides combine to make a single tide wave Lunar tide Solar tide earth sun moon

Spring Tides during a new and full moon earth, sun & moon line up produces highest of high and lowest of low tides

Neap Tides during the 1st & 3rd quarter moons earth, sun, and moon are at right angles produces small high and low tides.

Tidal Time Solar day is 24 hours Lunar day is 24 hours 50 minutes. Tides occur 50 minutes later each day. Moon rises about 50 min later each night. Lunar Month = One tidal month 29.5 days 2 spring tides 2 neap tides