NATS 1945 Lecture Notes - Lecture 3: Gravimeter, Contact Force, Orbital Speed
21 Oct 2017
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Supporting force acts perpendicular to supporting surface. Exerted by air molecules on an object that is moving through the air. Part 2: mass and gravity: mass: a measure of an object"s amount of atoms, gravity: an attractive force (a pull) exerted by all objects with mass; the greater the mass, the stronger the pull. Can be mapped by a gravimeter; yielding density maps. Gravimeter contains materials which are sensitive enough to feel the changes in the tiny gravity pulls that the device experiences as it moves across a surface of mass. Earth"s gravity eld is weakest at its equator: grace system has revealed that the mass of antarctica is getting smaller due to global warming. Part 3: weight and the law of gravity: weight: the strength of gravity exerted by a planet (or moon, star, etc) on an object in the planet"s gravity eld. The more massive the object, the greater its weight on the planet.
