Friction : impulsive or non impulsive?

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The discussion focuses on the relationship between friction and normal reaction forces, questioning whether friction can be impulsive due to the impulsive nature of normal reactions. Examples provided include the effects of "English" on a cue ball in pool and the behavior of a spinning rubber ball. The conversation also touches on topspin in tennis, highlighting that different types of friction depend on surface characteristics and applied forces. Additionally, the concept of pressure drag is mentioned as a factor in understanding friction dynamics. Overall, the interplay between friction and impulsive forces is a key theme in this discussion.
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Maximum value of friction depends upon the normal reaction and normal reaction can be impulsive, so does that imply friction can be impulsive?
 
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swayne221b said:
Maximum value of friction depends upon the normal reaction and normal reaction can be impulsive, so does that imply friction can be impulsive?

Sure. A couple of examples that spring to mind are the application of "English" to the cue ball on a pool table and the behavior of a spinning rubber ball as it bounces.

Edit: And the application of topspin to a tennis shot as the racket hits the ball.
 
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There are a bunch of different kinds of friction. It depends on the surfaces, forces, and definitely the impulses. If you account for pressure drag as a part of friction, it's kinda like skipping a rock.
 

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