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4th Quarter Science

TermDefinition
Electromagnets a magnet in which the magnetic field is produced by the electric current; the strength can be easily changed by changing the amount of electric current that flows through it, it can be turned on & off, & no medium needed
Examples of uses for electromagnets (5) speakers, hard drives, motors, generators, MRI machines,
Magnetic field located around the two poles (north & south) and contains moving electric charges; the farther from the poles, the weaker the field.
Electric field the area around an electric charge that experiences the force exerted by the electric charge
Types of energy transfers (8) mechanical, nuclear, sound, thermal, radiant, chemical, elastic, electrical
Waves a disturbance that transfers energy from place to place (a source of energy forced the matter in a medium to vibrate, causing a disturbance)
Vibrations a disturbance to the matter of a medium, caused by a source of energy
Transverse waves waves that move the medium perpendicular to the direction of the waves are traveling
Longitudinal waves the medium moves parallel to the direction the waves are traveling (medium moves back and forth)
Rarefaction particles are far apart
Compressions particles are close together
Wavelength (transverse) the distance between 2 corresponding points (trough to trough OR crest to crest)
Wavelength (longitudinal) the distance between compression to compression
Frequency the # of complete waves that pass a given point in a certain amount of time (Hertz)
Amplitude (transverse) the vertical distance between the peak/valley of a wave and the rest position
Amplitude (longitudinal) the measurement of how compressed or rarefied the medium becomes
Speed how far the wave travels in a unit of time
Created by: spuent