Online Physics Glossary 
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Word 
Meaning 
Remarks 
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.


Lenz’s 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.


Linear accelerator 
Device to accelerate subatomic particles by applying successive electric field.


Linear relationship 
Relationship between two variables, x and y, summarized by the equation y= ax + b, where a and b are constant.


Linear restoring force 
Force in direction toward equilibrium position that depends linearly on distance from distance from that position.


Liquid 
Materials that have fixed volume but whose shape depends on the container.


Lodestone 
Naturally occurring magnetic rock.



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