Jack D. Ripper flipped out after missing a Must-Do-It question for the third time on his Minds On Physics assignment. Outraged by the futility of his efforts, he flings a 4.0-gram pencil across the room. The pencil lodges into a 221.0-gram Sponge Bob doll which is at rest on a countertop. Once in motion, the pencil/doll combination slide a distance of 11.9 cm across the countertop before stopping. The coefficient of friction between the doll and the countertop is 0.325. Determine the speed at which the pencil is moving prior to striking Sponge Bob.

how do i use friction 2 find momentum?

Question

Jack D. Ripper flipped out after missing a Must-Do-It question for the third time on his Minds On Physics assignment. Outraged by the futility of his efforts, he flings a 4.0-gram pencil across the room. The pencil lodges into a 221.0-gram Sponge Bob doll which is at rest on a countertop. Once in motion, the pencil/doll combination slide a distance of 11.9 cm across the countertop before stopping. The coefficient of friction between the doll and the countertop is 0.325. Determine the speed at which the pencil is moving prior to striking Sponge Bob.

how do i use friction 2 find momentum?

anonymous · Answer

find force exerted by pencil to doll
use friction formula to find displacement that would force applied by pencil move the doll away.

anonymous · Answer

The force of friction is equal to the coefficient times normal force...that would get me Ff, but how would i go from there? I'm not sure how to find displacement with the friction formula...

anonymous · Answer

nice qn ^.^ u knw here two concepts will be apply first part vertical motion and in second part friction i have drawn a rough sketch 
|dw:1343664501800:dw| here from first and second case we will get ditance 
now |dw:1343664671529:dw| we know at stoppage v=0