MHT-CET : Physics Entrance Exam

### MHT - CET : Physics - Gravitation Glossary

 ·                     Newton's Law of Universal Gravitation: Every particle of matter in the universe attracts every other particle with a force which is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them. ·                     Gravitational Field: The space surrounding any mass is called a gravitational field. ·                     Gravitational Intensity: The gravitational intensity at any point in a gravitational field is defined as the force acting on a unit mass placed at that point. ·                     Gravitational Potential Energy: The gravitational potential energy at a point in the gravitational field is defined as the amount of work done in bringing the body from infinity to that point. ·                     Gravitational Potential: The gravitational potential at any point in a gravitational field is defined as the work done to bring a unit mass from infinity to that point. ·                     Orbital Velocity (Critical Velocity or Proper Velocity): The horizontal velocity with which a satellite must be projected from a point above the earth's surface, so that it orbits in a circular path around the earth, is called the orbital velocity or critical velocity of the satellite. ·                     Escape Velocity: The minimum velocity with which a body should be projected from the surface of the earth so that it escapes the gravitational field of the earth is called the escape velocity of the body. ·                     Period: The time taken by the satellite to complete one full revolution around the earth is called period or time period. ·                     Binding Energy: The minimum energy which must be supplied to a body, so that it can escape from the earth's gravitational field, is called the binding energy. ·                     Satellite: Any smaller body, which revolves around a larger body under the influence of gravitation, is called a satellite. ·                     Natural Satellite: A heavenly body revolving around its planet in a stable orbit is called a natural satellite. ·                     Earth Satellite: An artificial satellite put in its orbit around the earth is called an earth satellite. ·                     Geostationary Satellite (Communication or Stationary or Synchronous Satellite): A satellite, which appears to be stationary when it revolves around the earth from east to west in an orbit coplanar with the equatorial plane at a height of about 36,000 km above the surface of the earth is called a geostationary satellite. Such an orbit is called a geostationary or synchronous or parking orbit. Its period is 24 hours. ·                     Weightlessness: Weightlessness is the state when the apparent weight experienced by a body becomes zero. The term "Zero gravity" is also used to describe the state of weightlessness.

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