MT2_solution.PDF - PHYS2ll Fan20l7 Midterm2 Draftv2 1 ,.

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1. PHYS 2ll  - Fan20l7 Midterm 2 Draftv2 A  I kg object is initially at rest on a flat, horizontal  frictional surface.  It is acted on by an external horizontal  force F and the nugnitude of the friction force between the object and the floor is depicted as a fwrction of the magnitude of the extemal applied force F in the gaph below. 6t^a{rt'  rzo  ti;ne{;c  VJ o- 4 r& 134 fiftGrnaf e,ry*$ed  farce  {f-t} Assurne  that frbtion and the external applied  force are the only forces acting on the object paralblto  the surfrce. At ttre rnonent that the external appliedforce  is 5 N, what is the instantaneous acceleration  of tIre object? A.  0 n/s2 B--  5 m/s2 G)g  "/t' D.  2 rrls2 E.  6 rrlsz (i= A block of mass M slides down a frictional inclined plane [email protected] veloct) The plane rmkes an angb Oto the horizontaL The net  force  on the block is: LLto  6'1:a  is  rnl c** s$ ft  is  9N  a,AJ.,s -J  rcnJ;"  {n;c[;rur ftrplio) 5^) Fnrt,  -2= 3Al = Ur46,  l*4 t./s' F+r ,Nl a down the incline and equal to Mg in rnagnitude. Qj  zero. C.  down the incline and geater than Mg in rnagnitude. D.  down the incline and less  than Mg in nrragnitude,  but not zero. E.  down the incline and equal in rnagninrde  to the force of kinetic friction. c^"+^^t  v,lo"ily =)  a.cceLrfi,  is  zerv nel zero {o...  i5 Page 1
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PHYS 2ll  - Fan}Ofi Mljterm 2 Draft{2 3.  T\vo bbcks are corurected  by an lleal rnassless  rope ard are  free  to slide abng a horizontal frbtbnbss sufrce. TtF righ bbck is pushed with a constant  force of 12 N. What  is the  tensbn in tlr rope? A.  6N B.  2N c.3N 6i'J f rA)  is  {t  nt  s,<lerua(  f** +,+41  ^or,  ".{  ba =  a  kJ (tt^rio>t  is  in{rrnol  jo  hnr;* r,St+  04  lo"L  is  n*li,,l,,rA efial  f^si o,vr  +0  ll.  b{/  6n uulrrl;nJ to  lL [f  q'v: e$  t'lrrl.) =) is I tg tl It4 f,- =) la--3q sY  s*t- l$" +1" w bl""l< proviJrs bl"ck  t Page 2 raN Qce*  l"rn{,>n  "f  lL /+  u/s  ^ FDD  is 4ul  ol  il,, 4x t:  qN
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frbtbnbss. What b the rnagniMe  of tlre tension  in the rope? ? PttYS 2ll  - FaX,20l7 Mitterm 2 Draft{2 4.  TWo bbcks wittr rmsses  rn6 ad  ms are conpcted to each other by a sning  over a rnassbss, frbt'pnbss ptilby as shown  below; both rnasses  renrain  in contact with the sufrce whbh b ffiem,ng  sin  0 rra *  nra m*m1{  cosf ?n' +r 4vqol TJ I inu3 T-=  Mtd Q= L Ag B.
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  • Spring '14
  • DouglasCowen
  • mechanics, Force, Friction, Trigraph, horizontal force, external applied force, horizontal frictional surface.

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