Tidal force
Gravitational effect also known as the differential force and the perturbing force
Tidal force
The tidal force or tide-generating force is the difference in gravitational attraction between different points in a gravitational field. It causes different parts of bodies to be pulled unevenly, so that those bodies are being stretched towards the attraction. Tidal force is the differential effect of gravity across an extended body. Rather than the total gravitational force, it is the spatial variation in that force. Equivalently, it is the gradient of the gravitational field or the derivative of the gravitational potential. Tidal forces are therefore a residual effect of gravity, arising because the near side of a body experiences a stronger attraction than the more distant far side. This produces a range of tidal phenomena, such as ocean tides. Earth's tides are mainly produced by the relative close gravitational field of the Moon and to a lesser extent by the stronger, but further away gravitational field of the Sun. The ocean on the side of Earth facing the Moon is being pulled...
Read on Wikipedia · Image Judy Schmidt, CC BY 2.0
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