07.10: Contact forces are examples of il.b u c;tzn 1mnq 2, juc21lhgx,a,4gwhich of the fundamental forces?

  99.02: Which of the following terms is NOT4kogoy75e: zv related conceptually to the others?

  02.20: The graph shows the relationship between the masskw-t he1tp qa1si4q-: of a number of rubber stoppers and their resulting weight on some far-off p1t4ih e1a tpk: q-qws-lanet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. Th/n.bc2oduhb .zk f0,izn;nz 2 1eim2he magnitude of the gravitational force on each block is indicated on the figure. What is the magnitu/fchk iz;,0mz 2ebnh i1nu2zo b.. 2dnde of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a serptczpwe4sic w+p*8+ ;ies of strings as shown in the figure. Which string has the greatest tensip;*8iwc+ezp sct+4 wpon?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = q6 *ol iuc)*nqa,utuar :y3i1 14.0 k。are stationary. The mass M rests on the floor. Which one of the following nlc,u oaar **:3tqu)1y6iq uichoices represents the tension in the string connecting the masses?

  14.13: Which one of the following; *t grnex.qq0hm uy8: scientists is most associated with the following statement: “For sma 08qne;q yxrt*.h :gmull displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F if/hg j uf15ze2 1*mdwas exerted at an angle of *maew/fhzg f52d u11 j$\theta$. The block of weight mg is initially moving the right with speed $v$. The coefficient of friction between the rough floor and the block is $\mu$. The frictional force acting on the block is:

  95.34: A student pulls a wooden box alon hj,5pe )4i* :kgdhdxyg a rough horizontal floor at constant speed by means of a force P as shown tyg) 5 epd:hkh,jxi d4*o the right. Which of the following must be true?

  99.08: A weight can be hung in any of th1+u :pp kivl;qe following four ways. In which case is the string miqp:vp+l1; uk ost likely to break?

  96.39: Assume the objects ipea2f5 tnb:.bn the following diagrams have equal mass and the strings holding them in place are identical. In which case would the string be most likely to bbe tnp5a:.2fbreak?

  16.10: A person wishes to accelerate an object upward uniformly. gwu2 b hluc3defwg+ 3e3g q 6yo5g7.w1Which one of the following choices+g52e3q d3 l7. u 3ochug ye6gwwgbfw1 must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instant of time, ,vu :u:u3nf mpthe mass has position 2.0 m, velou:mun v ,u3f:pcity 3.0 m/s,and acceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed to the right on a rough surface by a h/kx.kyl-*;om ds 1z nworizontal force of 15 N as shown, dur-k;w*yos.k/ x z dnl1ming the push, the object accelerates uniformly to the right at 2.5 $m/s^{2}$ . What must be the magnitude of the force of friction also acting on the object during the push?

  96.32: The 10.0 kg box shown in the figure to the right if+me/2t irrs9s sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is /t9 +rrsi2mf emoving with:

  00.32: A block rests on a flat plane inclined at an anozr wr 644ctz-gle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?

  99.32: A wooden box is first pulled across a horizontal steel plate as sh;2pev 7vwl. xwown in txlv;p7ww. v2e he diagram A.
The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined
case (B) compare to the horizontal case (A)?

  07.09: A block rests hn3qjq n;:3 (::re truro*czg on an incline that makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the incline on the 3 ; ruhcgrt(nzrjq oqne*:3: :block

  01.11: A 5 kg block rests on a flat plane inclined at an angle o4j y2kjg 9.ukwf $30^{\circ}$ to the horizon as shown in the diagram below.

What would be the acceleration of the block down the plane assuming the force of friction is negligible?

  01.12: If the block is placed on a second plane (where fr -wfexps0 od:5iction is significant) in inclined at the same0 e5psdx:ow -f angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of mag. -e-wqk arqvce 4qh42nitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? The y-axis is perpendicul qq-v. chawrqe42-k4e ar to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant speed on an inclined p91raa gz f ri-y.9d5jblane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the followinza91 -b9. jyafdirr5 gg choices represents correct relationships between

  08.20: A person pushes a block of mass/rr jj8e*2ok t M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surfat kj re/8ojr2*ce inclined $30^{\circ}$above the horizontal. The coefficient of kinetic friction between the block and the surface is μ = 0.40. What is the net force acting on the block?

  14.20: A uniform block of mass misplaced on an inclined plane of9 yl2b ltx hbgeu;s -8,lq-vq/ angle θ . When released, the block do 9/2q-lv,xqbybuslg e l;-8th es not move. It is determined that the normal force acting from the incline on the block has a magnitude of 62 N while the force of static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of masm rcwwb/je ns)i x5i8iv26)k7s M is released from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal.j scx 6/nmb viiw 8ki752r)w)e The incline remains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?