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| A mass that has collapsed to so great a density that its enormous local gravitational field prevents light from escaping |
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| The point at the center of an object's mass distribution, where all its mass can be considered to be concentrated. For everyday conditions, it is the same as the center of gravity |
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| That which exists in the space surrounding a mass, electric charge, or magnet, so that another mass, electric charge, or magnet introduced to this region will experience a force. Examples of force fields are gravitational fields, electric fields, and magnetic fields |
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| A force field that exists in the space around every mass or group of masses |
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| A tide that occurs when the moon is halfway between a new moon and a full moon, in either direction. The tides due to the sun and the moon partly cancel, so that the high tides are lower than average and the low tides are not as low as average |
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| The deviation of an orbiting object from its path around a center of force caused by the action of an additional center of force |
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| A high or low tide that occurs when the sun, Earth, and the moon are all lined up so that the tides due to the sun and moon coincide, making the high tides higher than average and the low tides lower than average |
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| Force that completely balances the weight of an object at rest |
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| The condition of free fall toward or around Earth, in which an object experiences no support force (and exerts no force on a scale). |
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