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Gravity, Inertia, and the Two Bulges. Two tidal bulges are created on opposite sides of the Earth due to the moon's gravitational force and inertias counterbalance. Click the image for a larger view.Gravity is a major force responsible for creating tides.Inertia, acts to counterbalance gravity. It is the tendency of moving objects to continue moving in a straight line. Together, gravity and inertia are responsible for the creation of two major tidal bulges on the Earth (Ross, D.A., 1995).ravity, Inertia, and the Two Bulges. Two tidal bulges are created on opposite sides of the Earth due to the moon's gravitational force and inertias counterbalance. Click the image for a larger view.
When the moon is full or new, the gravitational pull of the moon and sun are combined. At these times, the high tides are very high and the low tides are very low. This is known as a spring high tide. Spring tides are especially strong tides (they do not have anything to do with the season Spring). They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides. Spring tides occur during the full moon and the new moon. Neap Tides During the moon's quarter phases the sun and moon work at right angles, causing the bulges to cancel each other. The result is a smaller difference between high and low tides and is known as a neap tide.