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chapter 9 vocab
Question | Answer |
---|---|
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 |