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science final
science
| Question | Answer |
|---|---|
| moving energy | kinetic |
| as an object falls its kinetic energy | increases |
| work is done on an object when a force acts in the ______ direction as the object moves | same |
| the three sources of energy for the earth are the sun, gravitational compression, and ? | radioactive decay |
| most of the worlds energy use is reliant on___ | fossil fuels |
| in this type of circuit if one element stops working the rest of the elements will continue to work. | parallel |
| moving electric charges create a ____ field | magnetic |
| type of eneergy stored in the bonds between atoms | chemical |
| type of wave behavior that occurs when a wave goes around an object | diffraction |
| sound is a type of ___ wave | longitudinal |
| according to newtons third law for every action force there is a ____ force | reaction |
| force on an object that is affected by its gravitational pull | weight |
| forces are considered ____ when there is no change in motion | balanced |
| type of material through which charge can flow easily | conduct |
| the name given to the cycling of the chemical elements through the earths systems | biogeochemical |
| force responsible for falling objects | gravity |
| the doppler effect explains that when on object moves toward you its ___ decreases and its frequency increases | wavelength |
| like magnetic poles ____ one another | repel |
| change in speed or direction causes this. | acceleration |
| the greater the ____ of a wave the greater the energy of the wave | amplitude |
| stored energy | potential |
| electromagnetic devices such as an electric motor change _____ energy into mechanical energy | electrical |
| as the stars move away from the earth the light from these stars is ____ shifted, this supports the theory that the universe is expanding | red |
| global warming is due to the increase levels of ___ | carbon dioxide |
| this is conserved when objects collide | momentum |
| unit for work | joules |
| the stars produces energy by nuclear _____ | fusion |
| electromagnetic waves ____ travel through empty space | can |
| resistence an object has to a change in its motion | inertia |
| magnetic field lines start near the magnet's ____ pole | North |
| semi liquid layer of the earth responsible for the movement of the tectonic plates | mantle |
| charge can be transferred by frictin, contact, and | induction |
| type of current produced by a battery | direct |
| the rate of doing work | power |
| as an object falls its potential energy | decreases |
| SI units for speed and velocity | m/s |
| how is the motion of an object affected when balanced and unbalanced forces act on it? | balanced no change in motion unbalanced change in motion |
| Si units for force | Newtons |
| Inertia | not a force, relates to an objects mass |
| newtons secoond law of motion | F-ma, increase in mass the greater the force to accelerate ( increase force) |
| mass vs weight | mass doesnt change |
| third law of motion | p=m*v or kg*m/s =momentum |
| action reaction ex | push on ground, ground pushes back |
| four forces of universe | strong, nuclear, electromagnetic, gravity |
| strong force = | protons and nuetrons |
| ex of gravitational and elastic potential energy | gravitational-hanging off a cliff elastic- sling shot |
| major forms of energy and how each is produced | thermal-heat, chemical-batteries, electical-energy, nuclear-nuclear power plants take nuclear energy to create electrical energy |
| name three ways energy can be transferred | conduction, convection, radiation |
| energy conversioons that take place in lighting a match | chemical>electrical>thermal>electromagnetism |
| nonrenewable energy resources | coal and fossil fuels, because it is inexpensive |
| mechanical waves- | can't travel through space has a medium (solid liquid and gas) |
| how waves are related to energy | wave cannot move medium, just vibrate |
| frequency- | number of complete cycles in a given time |
| how do you measure amplitude | measure from center to trough/crest |
| how is the energy of a wave related to its amplitude | increase amp, increase energy |
| how does a reflection change a wave | bounces back |
| what are two types of interference | constructive and destructive |
| what produces electromagnetic waves | charged particles |
| how are electromagnetic waves different from mechanical waves | travels through empty space, same speed, (different frequency and wavelength)* |
| name two factors that affect the strength of an electric field | charge and distance |
| what does induction do | brings near it not actually touching it |
| the push that gets the charges through the circuit | voltage |
| what makes a material magnetic | magnetic domain (all the magnetic field of atoms |
| what else can creat a magnetic field besides a magnet | movinng charges |
| what is the purpose of a transformer? | increase or decrease voltage |
| fossil fuels used to generate electricity | turn turbine* |
| what is the earths core made of | iron core |
| what is the area around the earth | magnetosphere |
| what is it about the core that produces one of the sources of energy for the earth | radioactive decay |
| what is Pangaea | super content(broke apart by tectonic plates) |
| what things increased carbon dioxide levels on earth | breathing and burning of fossil fuels |
| what evidence supports the big bang theory | cosmic background radiation>hot universe is expanding>red shifting |
| how did chemical elements of a star form | gravitational clumping and fusion |
| how does the suns energy reach the earth | radiation |
Created by:
perihoff
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