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Online Physics Glossary
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Word Meaning Remarks
Kilogram SI unit of mass.
Kilowatt hour Amount of energy equal to 3.6 * 10^ 6 J. Usually used in electrical measurement.
Kinematics Study of motion of objects without regard to the causes of this motion.
Kinetic energy Energy of object due to its motion.
Kinetic-molecular energy Description of matter as being made up of extremely small particles in constant motion.
Laser Devise that produces coherent light by stimulated emission of radiation.
Laser- induced fusion Proposed method of creating nuclear fusion by using heating caused by intense laser beams to squeeze matter together.
Law of conservation of energy In a closed, isolated system, the total momentum is constant.
Law of reflection Angle of incidence of a wave is equal to the angle of reflection.
Law of universal gravitation Gravitational force between two objects depends directly on the product of their masses and inversely on the square of their separation.
Lens equation See mirror equation.
Lenzís law Magnetic field generated by an induced current opposes the change in field that caused the current.
Lepton Particle that interacts with other particles only by the electroweak and gravitational interactions.
Lever arm Component of the displacement of the force from the axis of rotation in the axis of rotation in the direction perpendicular to the force.
Light Electromagnetic radiation with wavelengths between 400 and 700 nm that is visible.
 
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