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15 Cards in this Set
- Front
- Back
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force |
a push or a pull |
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gravity |
the force that pulls an apple to the ground, and keeps the moon and the earth together |
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law of universal gravitation |
newton's law that states every object in the universe attracts every other object in the universe |
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mass |
the amount of matter in an object |
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weight |
the force of gravity on an object |
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inertia |
the tendency of an object to resist a change in motion |
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newton's first law of motion |
newton's law that states an object at rest will stay at rest, and an object will stay in motion with constant speed and direction unless acted on by an outside force |
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astronomy |
the study of the moon, stars, and other objects in space |
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axis |
the imaginary line that passes through the earth's center and the north and south poles(an imaginary stick that has skewered the earth) |
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rotation |
the spinning of earth on its axis |
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revolution |
the movement of one object around another |
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orbit |
the curved path of an astronomical object around a star, planet, or moon |
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calendar |
a system of organizing time that defines the beginnings, length, and divisions of a year |
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solstice |
when the sun is furthest north or south of the equator |
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equinox |
when neither hemisphere is tilted toward or away from the sun(both hemispheres receive the same amount of sunlight) |
