Jusaquikie
  • Jusaquikie
Body A weighs 102 N, and body B weighs 32 N. The coefficients of friction between A and the incline are μs = 0.56 and μk = 0.25. Angle θ is 40°. Let the positive direction of an x axis be up the incline. (b) Find the acceleration of A if A is moving up the incline.
Physics
katieb
  • katieb
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anonymous
  • anonymous
post the figure or a diagram.
Jusaquikie
  • Jusaquikie
1 Attachment
Jusaquikie
  • Jusaquikie
i have T-102Nsin(40)-19.5=m1a =-6.09

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Jusaquikie
  • Jusaquikie
but i know this is wrong, i think i'm supposed to use the total weight of the system after watching some youtube videos
anonymous
  • anonymous
block on ramp: T -102N*cos(40) - uk*102N*sin(40) = (102N/g)*a suspended block: 32N-T =(32N/g)*a solve for T T=32N -(32N/g)*a plug into first equation and solve for a.
Jusaquikie
  • Jusaquikie
i think i keep confusing my cos and sin
anonymous
  • anonymous
hold up. I think I may have confused sin and cos. lol.
anonymous
  • anonymous
yeah I switched them, sorry: block on ramp: T -102N*sin(40) - uk*102N*cos(40) = (102N/g)*a
Jusaquikie
  • Jusaquikie
this isn't different than what i am getting then my numbers are 24N-65.6N-19.5N divided by 10.4
Jusaquikie
  • Jusaquikie
for x1
anonymous
  • anonymous
|dw:1348867218201:dw|
anonymous
  • anonymous
how'd you find T?
Jusaquikie
  • Jusaquikie
i thought we drew that angle like this|dw:1348867283133:dw| i got a = 2.45 solving the frictionless problem then solved fro t in x2 as t=32n-(3.27*2.45)
anonymous
  • anonymous
naw, you want components 'along' or 'into' the ramp.
anonymous
  • anonymous
in your sketch mg is a component of some other vector... I don't know what it is
anonymous
  • anonymous
I got -3.8 m/s^2 (g=9.8) that's the answer your book has, no doubt. so try my way:)
Jusaquikie
  • Jusaquikie
first i did it with no friction o see what would happen and determine my coordnate system. in x2 i solved T=32N-m2a, i put that in x1 and got 32N-m1a-102Nsin(40)=(102N/g)a that turned to 32N-102Nsin(40) = a(10.4+3.37) then through algebra i got a = 2.45
Jusaquikie
  • Jusaquikie
it's not that i'm not trying your way i think were drawing it different but we have the same 102Nsin(40)
Jusaquikie
  • Jusaquikie
when i redrew my FBD for the (b) Find the acceleration of A if A is moving up the incline. nothing changed in x2 so i assumed it would be the same. maybe i have to redo the problem and see if i can get the answer you got.
Jusaquikie
  • Jusaquikie
Thanks Algebraic, i was being lazy and thought the tension would be the same. your right i t was -3.88 m/s^2
anonymous
  • anonymous
cool!

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