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29 Cards in this Set
- Front
- Back
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How does earth move in space?
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Earth moves through space in two major ways: rotation and revolution. (p.7)
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What causes the cycle of seasons on Earth?
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Earth has seasons because its axis is tilted as it revolves around the sun.
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What causes day and night?
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The earth's rotation causes day and night.(P.7)
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Each 24 hur cycle of day and night is called what?
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A day.
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Why is it warmer near the equator than near the poles?
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The sunlight hits Earth's surface most directly near the equator. The sunlight at the poles is spread over larger area because it arrives at an angle.
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Each of the two days of the year when the noon sun is farthest north or south o th equator is called a(n)_______
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solstice
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Eac of the two days of the year when neither hemisphere is tilted toward or away fro the sun is called a(n)_______
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equinox
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astronomy
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The study of the moon, stars, and other objects in space.
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axis
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Th imaginary line that passes through Earth's center and the North and South poles.
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rotation
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The spinning of the Earth on its axis.
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revolution
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The movement of one object around another.
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orbit
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The path of an object as it revolves around another object in space.
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calendar
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A system of organizing time that defines the beginning, length and divisions of a year.
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Leap Year
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The romans borrowed the Egyptian calendar of 365 days but the Earth's orbit is 365-1/4 so they adjusted it by adding a day every 4 years.
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What determines the strength of the force of gravity between two objects?
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The strength of the force of gravity between two objects depends on two factors: the masses of the objects and the distance between them.
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What two factors combine to keep the moon and Earth in orbit?
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Newton concluded that two factors-inertia and gravity-combine to keep Earth in orbit around the sun and the moon in orbit around Earth.
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Force
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A push or a pull exerted on an object.
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Gravity
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The attraction force between objects; its strength depends on their masses and the distance between them.
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Law of Universal Gravitation
(Newton's Law) |
The scientific law that states that every object in the univers attracts every other object. (Newton)
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Mass
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The amount of matter in an object.
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Weight
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The force of gravity on an object.
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Inertia
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The tendency of an object to resist a change in motion.
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If mass increases then force___________.
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Increases
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If distace between two objects increases then Force__________.
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Decreases
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Does the mass of an object change?
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No
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Does the weight of an object change?
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Yes, depending on its location. On the moon you would weigh less. The moon has a smaller mass than the earth so the force between you and the moon would be decreased.
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Why don't the planets collide or fall into the sun?
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The tendency of an object to resist a change in motion is inertia. The more mass of the object the greater the inertia.
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More mass of an object the _______ the inertia.
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greater
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Less mass of an object the _______ the inertia.
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Less
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