To amplify means to intensify or increase something. Friction is a type of force.
Consider using a rolling object. The more the speed of the object increases so does the friction. The friction attempts to slow down the object because of gravity, thus increasing frictional force.
A rough surface beneath a rolling object as opposed to a smooth surface can also do the same due to air pockets in holes in the surface.
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An amplifier
Maser
The opposite of muffling a sound would be amplifying.
Yes.
saturation in amplifying stages
earth your amp
Active filters.
Amplifying information moved to the discussion page.
positive feedback.