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15 Cards in this Set

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force

a push or a pull

gravity

the force that pulls an apple to the ground, and keeps the moon and the earth together

law of universal gravitation

newton's law that states every object in the universe attracts every other object in the universe

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

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

astronomy

the study of the moon, stars, and other objects in space

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)

rotation

the spinning of earth on its axis

revolution

the movement of one object around another

orbit

the curved path of an astronomical object around a star, planet, or moon

calendar

a system of organizing time that defines the beginnings, length, and divisions of a year

solstice

when the sun is furthest north or south of the equator

equinox

when neither hemisphere is tilted toward or away from the sun(both hemispheres receive the same amount of sunlight)