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1. How do we measure gravity?
The center of mass of an object
2.what is tidal force?
When a massive object affects a smaller object
3.what is the overall effect of tidal force?
To stretch an object

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Spring tides- Fall very high and very low, happens on a full moon and new moon.

Neap tides-neither falls very high or low, happens during 1st or 3rd quarter.

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Every lunar cycle there are 2 "bulges" in the tide. There are 2 low and 2 high tides every 24 hours.

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tides are caused by the gravity interactions between the Earth and the Moon. The gravitational attraction of the moon cause the oceans to pull in the direction of the moon.

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the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun