gravity - an attractive force that exists between all objects that have mass., orbit - the path an object follows as it moves around another object, solar system - the Sun together with the group of celestial bodies that are held by its attraction and revolve around it., eccentricity - the measure of how far an objects orbit is from being circular, ellipse - a stretched out circle., inertia - the tendency for objects in motion to resist changes to their direction and speed. , momentum - a measure of how hard it is to stop a moving object, period of revolution - the time it takes an object to travel once around the Sun., period of rotation - the time it takes an object to complete one rotation, planet - an object that orbits a star that is large enough to be nearly spherical in shape and that has no other large object in its orbital path., Newton’s Law of Universal Gravitation - states that all objects in the universe attract each other through gravitational force.,

Gravity and Motion

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النمط البصري

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