Tide Number Day Science Project Idea

Science Project Idea Number of Tides in a Day

Why there are two high tides a day. You already know from your study of geography that the earth rotates once in twenty-four hours. Therefore, how many times a day is the moon directly opposite any part of the earth? It can be easily understood, then, how a wave of water will travel around the earth. In what direction will it travel? Explain. (Note: Does the moon rise in the east or the west?) According to this, how many tides a day will there be? But, in reality, how many are there?

From the fact that high tides are about twelve hours apart when there is high tide on any part of the earth, at what other part of the earth is the other high tide? Our problem then is, how is this second high tide, on the side of the earth away from the moon, caused.

Recall the way in which gravitation acts upon the solid earth and upon the water of the ocean. How much farther away from the moon is the water on the opposite side of the earth than the center of gravity of the solid earth? Upon which, therefore, will the pull be greater? It can be understood now how there is a tendency for the solid earth to be pulled away from the water and as a result the water will flow in, causing an elevation of the water, thus producing a tidal wave on the side of the earth away from the moon. In what direction will this tidal wave travel and at what rate compared with the tidal wave directly under the moon? There is also another force which helps produce this tidal wave on the side of the earth away from the moon, which can be understood a little later.

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