![]() Triangles show the points at which the orbital period is equal to the Right-hand side, which has been expanded by a factor of 10 compared to Scale on the left-hand side, and the dotted line with the scale on the If in addition the spin period of the Earth is as shown in figureġ for that distance. Increase, which means that the distance of the Moon must increase.įigure 2 shows which total energy \(E\) is in theĮarth-Moon system if the Earth and Moon are at distance \(r\) fromĮach other, if the Moon shows always the same side to the Earth, and (which is far greater than the spin angular momentum of the Moon) must If the spin period of the Earth increases, then its angular momentumĭecreases, which means that the orbital angular momentum of the Moon Parameters left: the spin period of the Earth and the distance between The orbital period follows from the distanceīetween the Earth and the Moon, so then there are only two free Moon to be equal (the Moon always shows us the same side), so they can Tidal forces have caused the spin period and orbital period of the Only go into the spin of the Moon or to the orbital motion of the TheĪngular momentum that disappears from the spinning of the Earth can Heat radiation carries energy but no angular momentum, so energy canīut angular momentum cannot disappear into space that way. (all?) of that heat disappears into space as infrared radiation. Part of the "lost" energy is converted into heat by friction, and part Laws say that energy and angular momentum can't just disappear. ![]() Theĭifferences must have gone somewhere else, because the conservation Kinetic energy due to the spin of the Earth also decrease. If the spin rate of the Earth decreases, then the angular momentum and Gradually slowing down the rotation of the Earth. Than the orbital period (the sidereal month). The spin period of the Earth (the sidereal day) is still a lot shorter Spin period of the Moon is already equal to its orbital period, but Other and equal to the orbital period of the Earth and the Moon. Try to make the spin periods of the Earth and the Moon equal to each The tidal forces between the Earth and the Moon Occur when (slightly) different forces of gravity work on different The Earth and the Moon exert tidal forces on each other. ![]() More difficult to convert heat into kinetic energy. The surroundings, partly in the form of heat radiation. The kinetic energy has then beenĬonverted into heat in the brakes and wheels, which disappears into Reduces the speed difference between the brakes and the wheels and Then you cause friction between the brakes and the wheels, which This means that energy or angular momentumĬannot just appear or disappear: they must always come from somewhereįriction is an important cause of the conversion of kinetic energy The Law ofĬonservation of Energy says that the total amount of energy of aĬlosed system is constant. Of angular momentum in a closed system is constant. The Law of Conservation of Angular Momentum says that the total amount The Evolution of the Orbit of the Moon if you want to know how Iĭid the calculations upon which this text is based.) ![]() The Moon is getting energy from somewhere. It takes energy to get further from the Earth, so apparently The Moon recedes from the Earth at an average rate of 3.7 cm per If the gravity of the Moon is strong enough to move huge amounts of water (in the tides), then why don't we feel many pounds lighter when the Moon is high overhead?.Why does the Moon slowly move away from the Earth, even though that takes energy?.Why are there usually two high tides and two low tides each day?.Why do the strongest tides (spring tides) occur when it is New Moon or Full Moon, and the weakest tides (neap tides) occur when it is First Quarter or Last Quarter?.Is the average time between two successive tides of the same kind tied to the Moon?.This page answers questions about tides and tidal forces. Average Time Between Successive High Tides/Low Tides
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