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chapter 9 vocab

QuestionAnswer
motion distance from other object changes
reference points is a place or object used for comparison to determine if something is in motion
distance is the length of a path between two points
displacement is the length and direction that an object has moved from its starting point
vector is a quantity that consists of both magnitudes and a direction
speed is an objects distance travels per unit of time
average speed to calculate
instantaneous speed is the rate at which an object is moving at a given instant in time
velocity is speed in a given direction
slope the slope of a direction verus time graph time graph represents speed that is
geocentric in a geocentric system earth is at the center of the revolving planets and stars
heliocentric is a model of the solar system in which earth and other planets revolver around the sun
ellipse is an oval shape maybe elongated or nearly circular
moon is a natural satellite that revolves around a planet
astronomical unit is a equal meter
nuclear fusion is the process in which hydrogon atoms join together in the suns core to form helium
core is the center region of the sun where nuclear ffusion takes place
radiation is a region of very tightly packed gas where energy is transformed mainly in the electromagnetic radiation
convection zone is the outermost layer of the suns interior
photosphere is the inner layer of the suns atmosphere
chromosphere is the middle layer of the suns atmosphere
corona is the outer layer of the suns atmosphere which means crown in latin
solar system is a steam of electrically charged particles that emanate from the suns corona
sunspots is the area of gas on the suns surface
prominences is a huge reddish loop of gas that protects from the suns surface
solar flares is an eruption of gas from the suns surface
terrestrial planets the name often given to four planets
acceleration is the rate at which velocity changes with time
work is done when an object is caused to move a certain distance
energy the ability to do work or cause of change
kinetic energy energy that is an object has due to its motion
potential energy stores energy that results from the position or shapes
gravitational potential energy potential energy related to an objects height
elastic potential energy the potentical energy of an objects that can be stretched of compressed
mechanical energy an object combined kinetic energy and potential energy
laws of conservation of energy states when one for of energy is transformed to another no energy is destroyed
Created by: mpendleton