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### 29 Cards in this Set

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