GravitationA series of free High School Physics Video Lessons from Brightstorm online Physics series..
Newton's Law of Universal Gravitation Newton's Law of Universal Gravitation says that everything with massive particle in the universe attracts all other massive particles. This force is called gravity. The force of gravity = universal gravitational constant (mass of one particle x mass of other particle) / (distance between the two particles)^2.
Gravitational Fields Gravitational fields are vector fields that show forces of gravity around a large object. A gravitational field pulls all surrounding objects towards the center of mass but pulls the matter at the center of mass of the object outward.
Tides Ocean tides are the rising and falling of the sea due to variations in the gravitational pull of the moon on opposite sides of the Earth. Tides are a type of wave with regular frequencies and periods which echo the motion of the moon.
Black Holes Black holes are formed when extremely large star dies. When a star dies, it first expands, then contracts. Large stars contract until their atoms collapse, pulling the electrons into the nucleus. The immense strength of the gravitational force of a black hole pulls all nearby matter in, even light (which has mass).
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