Terms : Hide Images
| 561079642 | acceleration | the rate of change of the velocity of an object | |
| 561079643 | alternating current | an electric current, used almost universally for home and industry, that changes its direction in regular cycles | |
| 561079644 | amplitude | maximum displacement, as of a pendulum or a particle of a wave, from position of the rest or equalibrium | |
| 561079645 | anode | an electrode, usually positive, through which current passes from a metallic to nonmetallic conductor | |
| 561079646 | Archimedes principle | a principle of fluid mechanics which states that a body immersed in a fluid is buoyed up by a foce equal to the weight of the displaced liquid or gas | |
| 561079647 | capacitor | a device for storing electric charge that consists of two conductors seperated by a nonconductor | |
| 561079648 | cathode | an electrode, usually negative, through which current passes from a non-metallic to a metallic conductor | |
| 561079649 | conduction | the transfer of heat by the collision of adjacent molecules caused by variations in temperature and kinetic energy | |
| 561079650 | conductor | a material, such as a metal, that readily permits the transfer of heat or electricity | |
| 561079651 | convection | the transfer of heat by the movement of masses of fluid caused by the variations in temperature and density | |
| 561079652 | direct current | an electric current that flows in one direction only, as in storage batteries | |
| 561079653 | Doppler effect | the change in the length or frequency of a wave, such as a light, sound, or radio wave, that results from the relative motion of the source or the receiver | |
| 561079654 | electrode | a conductor used to establish contact beween a metallic and a non-metallic part in an elctric circuit | |
| 561079655 | electromagnetic wave | any of various transverse waves that result from the motion of electric charges, differ only in wave-length and frequency, and travel at the speed of light in a vacuum, including radio waves, microwaves, visible light, gamma rays, X rays, ultraviolet rays, and infrared rays | |
| 561079656 | energy | the ability to do work | |
| 561079657 | entropy | a measure of the sisorder of a system or of the unavailability of energy | |
| 561079658 | force | a push of pull on a body | |
| 561079659 | frequency | the number of waves passing through a point per unit time | |
| 561079660 | friction | the resistance to motion between two bodies rubbing against each other | |
| 561079661 | fulcrum | the point upon which a lever rests | |
| 561079662 | gravitation, universal law of | a law which states that every particle i the universe attracts every other particle with a force directly proportional the the product of the masses of the two particles and inversely proportional to the square of the distance between their centers of mass | |
| 561079663 | gravity | the force of the eaarths attraction for bodies at or near its surface | |
| 561079664 | harmonic motion | a regular vibration or a periodic motion in which the restoring force on a body, such as a pendulum is proportional to the displacement of the body from its position of equilibrium | |
| 561079665 | heat | thermal or internal energy that is eing transferred from one body to another | |
| 561079666 | inertia | the tendency of matter to remain at rest or, if in motion, to stay in motion unless acted on by an external force | |
| 561079667 | insulator | a material, such as a nonmetal, that impedes the transfer of heat or electricity | |
| 561079668 | kinetic energy | the energy of a body due to its motion | |
| 561079669 | lever | a simple machine that consists of a rigid bar supported at one point and used to overcome resistance at a second poin when force is applied at a third | |
| 561079670 | longitudinal wave | a wave, such as a sound wave, in which the disturbance is in the direction of propogation | |
| 561079671 | momentum | the product of a bodys mass and velocity | |
| 561079672 | Newtons first law | a law of motion which states that a body at rest remains at rest or a body in motion stays in motion at a constant speed in a straight line unless acted on by an unbalanced external force | |
| 561079673 | Newtons second law | the net force acting on an object is equal to the product of its acceleration and its mass | |
| 561079674 | Newtons third law | law states that for every action there is an equall and opposite reaction | |
| 561079675 | period | the time for one complete vibration of a particle of a wave | |
| 561079676 | periodic wave | a wave caused by a distrubance reapeating itself at regular intervals | |
| 561079677 | potential energy | capacity of a body to do work as a result of its position or the arrangement of its parts | |
| 561079678 | power | the rate at which work is done | |
| 561079679 | pulley | simple machine consisting of a grooved wheel and a rope that is used to change the direction of a pulling force and to reduct the effort required to lift a load | |
| 561079680 | quantum | a tiny paket or bundle of energy | |
| 561079681 | quantum theory | theory of modern physics which holds that energy does not travel continuouslly in waves but discontinuously in seperate parcels called quanta | |
| 561079682 | radiation | the transfer of energy by electomagnetic waves | |
| 561079683 | relativity | Einstein's theory that all aspects of the physical universe must be defined in relative terms | |
| 561079684 | scalar | quantity, such as time or distance, that has magnitude but no direction | |
| 561079685 | thermal energy | the internal energy of a body that is associated with the positions and motion of its molecules | |
| 561079686 | thermodynamics | the branch of physics that studies the conversion of heat into mechanical and other forms of energy | |
| 561079687 | thermodynamics first law | law which states none of the heat added to a closed system is ever lost but can be accounted for in mechanical work or an increase in thermal energy | |
| 561079688 | thermodynamics second law | law which states that heat never flows from a cold body to a hot one and that the entropy of the universe never decreases | |
| 561079689 | transverse wave | a wave succh as a light wave, in which the disturbance is perpendicular to the direction of propagation | |
| 561079690 | vector | a quantity, such as displacement or acceleration, that has both magnitude and direction | |
| 561079691 | velocity | the speed and direction of mtion | |
| 561079692 | wave | the propogation of a disturbance from one place to another | |
| 561079693 | wavelength | the distance between two identically placed points on succesive waves | |
| 561079694 | weight | a measure of the pull of gravity on a body | |
| 561079695 | work | a measure of the transfer of mechanical energy fom one body or system to another, expressed as the product of the force applied and the amount of displacement along the direction of motion |
