The tides
W H A T ARE THE TIDES?
T ID ES A R E T H E R EG U L A R R IS IN G A N D F A L L IN G O F T H E
SEA.
https://www.youtube.com/watch?v=ks90u6nY26M&ab_channel=Niccol%C3%B2Turrioni
https://www.youtube.com/watch?v=EnDJ6_XpGfo&ab_channel=KevinSnairKevinSnair
GRAVITY
the force which draws objects to
the earths centre
the effect of gravity is
determined by strength, size and
distance
G RA V ITA TIO N A L FO RC ES
A F F E C T I N G EARTH
H O W DO ES G RA V ITY
A F F E C T TIDES?
Tides are caused by the gravitational pull of the
moon. The gravitational pull of the moon causes
the oceans to bulge out in the direction of the
moon.
The earth is also being pulled towards the moon
and away from the water on the far side and this
causes another bulge on the opposite side.
Spring tides
When the sun, moon and earth all line up at n e w m o o n
m o o n we get the higher high tides and lower low tides
or full
This is because the gravitational forces ofthe sun and moon combine to
have a stronger pull on the water creating higher bulges
Spring tides
Neap tides
Twice a month, during the first and last quarters, the sun and moon are at
right angles to each other.
This means that their gravitational pulls are coming from two different
directions so that they do not have a great effect on the oceans.
This causes smaller tides, so that the high tides are lower than usual and the
low tides are higher than usual. ( there is not a big difference between high
and low tide)
Neap tides
how often do we get tides?
https://oceanservice.noaa.gov/education/tutorial_tides/tides05_lunarday.html