Qualification > Sciences

FRICTION !!!!!!!! HELP!!!!

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nid404:

--- Quote from: astarmathsandphysics on November 02, 2009, 09:52:38 am ---Will answer when i get home

--- End quote ---

cool

astarmathsandphysics:
Resolving horizontally for the wedge

T+mgsin37-Tcos37=ma ma=mgsin37+T(1-cos37) (1)
resolving down the slope for the block
mgsin37-T=ma/cos37 so T=mgsin37-ma/cos37 sub into (1)
ma=mgsin37+(mgsin37-ma/cos37)(1-cos37)
then divide by m

 

nid404:

--- Quote from: astarmathsandphysics on November 02, 2009, 01:09:02 pm ---Resolving horizontally for the wedge

T+mgsin37-Tcos37=ma ma=mgsin37+T(1-cos37) (1)
resolving down the slope for the block
mgsin37-T=ma/cos37 so T=mgsin37-ma/cos37 sub into (1)
ma=mgsin37+(mgsin37-ma/cos37)(1-cos37)
then divide by m

 

--- End quote ---

I know this may kinda irritate you......but when I solve this...I get 5g/13... :-[........the answer is 13mg/18..damn!!!

nid404:
could u draw a free body diagram please....I won't understand this otherwise

astarmathsandphysics:
Resolving horizontally for the wedge

T+mgsin37-Tcos37=ma ma=mgsin37+T(1-cos37) (1)
resolving down the slope for the block
mgsin37-T=ma so T=mgsin37-ma sub into (1)
ma=mgsin37+(mgsin37-ma)(1-cos37)
ma+ma(1-cos37)=mgsin37+mg(1-cos37) so a=(mgsin37+mg(1-cos37) )/(m+m(1-cos37))

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