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Online Physics Glossary
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Word Meaning Remarks
Ideal mechanical advantage In simple machine, the ratio of effort distance to resistance distance.
Illuminance Rate at which electromagnetic wave energy falls on a surface.
Illuminated object Object on which light falls.
Image Reproduction of object formed with lenses or mirrors.
Impulse Product of force and time interval over which it acts.
Impulse-momentum theorem Impulse given to an object is equal to its change in momentum.
Incandescent body Object that emits light because of its high temperature.
Incident wave Wave that strikes a boundary where it is either reflected or refracted.
Incoherent light Light consisting of waves that are not in step.
Independent variable Variable that is manipulated or changed in an experiment.
Index of refraction Ratio of the speed of light in vacuum to its speed in a material.
Inelastic collision Collision in which some of the kinetic energy is changed into another form.
Inertia Tendency of object not to change its motion.
Inertial mass Ratio of net force exerted on object to its acceleration.
Initial velocity Velocity of object at time t=0.
 
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