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### 76 Cards in this Set

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 what are the two main measuring systems? english and metric ___cm=1 meter 100cm ___m= i kilometer 1000m ___cm=1 inch 2.54 ___mi= 1 kilometer .62 miles velocity speed in a given direction acceleration the rate at which an object changes position a sparrow accelerates at 4 mps2 this means that each second the sparrows velocity changes by how much? 4meters What does it mean when the acceleration of an object is negative? That the object is moving backwards. volume a measure of how much space an object takes up ___ml= 1 liter 1000 mass amount of matter in an object will the mass of an object change if it is moved from the earth to the moon? no, only the weight Gram mass of 1 cubic centimeter of water at 4 degrees celcius ___g= 1 kilogram 1000 grams force push or pull of an object english unit of force pound, lb metric unit of force newton, n __n=1 pound 4.5 newtons all objects at rest have________forces acting on them balanced All objects at a constant velocity have ____ forces acting on them balanced All accelerating objects have ______ forces acting on them unbalanced Newtons 1st law an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force newtons 2nd law f-ma newtons 3rd law every action has an equal and opposite reaction value of g on earth 9.8 meters per second2 double mass= __________force due to gravity double Calculating work w=f x a metric unit to measure work newtons english unit to measure work foor pounds power rate at which work is done power in metric joules per second power in english foot pounds per second 1 hp=_____ ft.lbs/sec 550ft.lbs/sec energy ability to do work energy in greek work within energy measure in joules kinetic energy energy due to an objects motion law of conservation of energy energy can neither be created nor destroyed law of conservation of energy exception nuclear energy waves a traveling disturbance that carries energy transverse wave a wave at which the medium moves perpindicular to the waves direction transverse wave measured by amplitude and wavelength more energy, high or low amplitude wave high more energy, short or long wavelength wave short longitudinal wave a wave in which the medium travels back and forth with the wave sound is caused by... caused by vibrating matter frequency measures... how often waves pass by one hertz= one per second high pitch sound is high or low frequency high frequency high pitch long or short wavelength short wavelength speed of sound 750 miles per hour how long does it take sound to travel one mile? 5 seconds atom a tiny particle made up of protons neutrons and electrons with one nucleus protons charge positive one protons location in the nucleus neutrons charge neutral neutrons position in the nucleus electrons charge negative 1 electrons location in specific orbitals surrounding the nucleus how much larger is a proton than a electron? 1836 times what 2 particles can be added together to make another particle proton+electron= neutron atomic number # of protons in an atom Mass number mass of an individual atom isotope atoms of an element containing a specific number of neutrons aluminum=symbol, atomic #, # protons, # neutrons, # electrons, mass #, isotope symbol al, 13,13,14,13,27, al-27 list eight orbitals in the order that they fill 1s,2s,2p,3s,3p,4s,3d,4p valence shell outermost shell of an atom list 7 types of electromagnetic radiation radio, microwave, infrared, visible, uv, xrays, gamma list 7 colors roygbiv red orange yellow green blue indigo violet speed of light 186,000 mi/sec refraction bending of light as it travels from one medium to another ac and dc alternating current and direct current alternating can go more than one way, direct follows one specific path big bang how the earth was created 13.7 billion years ago half life the amount of time that it takes for half of the atoms of a substance to decay supernova when iron forms, the star collapses then explodes