07.10: Contact forces are examp.ky j7hlcfet; wh.b 2xe;v4/ sles of which of the fundamental forces?

  99.02: Which of the following terms is NO:.a*+ nblokas T related conceptually to the others?

  02.20: The graph shows the e(r, m;erqt x,m 8log3relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. Thrtx qr,lm e(go,;8m 3ee slope of the graph is a representation of the:

  10.15: Three blocks, i9lq qphif128labeled A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact f9h8 2 qqifp1liorce on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a setjr7oe5j t))pq (dux( ries of strings as shown in the figure. Which string has theu)trpj5o7 tjd qx() (e greatest tension?

  16.05: In the figure shown, fac/t; .9qtkrthe mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents;.tf aq/ckt 9r the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most as r*e.; 8h1k(xtpbev epsociated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is propo8x .hvpbpeke *er;1t(rtional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted,qf ik.1.t8pfdqfy- l at an angle of f ,1y-qdtql8fikp. f.$\theta$. 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 nj/qpkpz.0 ogr *2kt/v ml-a *wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of *z/0p lqtgo2pknmjv */ka.-rthe following must be true?

  99.08: A weight can be hung in any of the sjka7u 81/0hfz6 yuvdfollowing four ways. In which case is t 7hju/usky 0dz6 vaf81he string most likely to break?

  96.39: Assume the objects in the following diagrams have equal *yoz uuao33 i.n9at,mr wffqh5 ,f5v2mass and the strings holding them in place are identical. In which case wouluortu .55,ahva3ffo 3,zy* 2m9fqnwi d the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Whiev +yqwd9r* u5ch one of the following choices must be true ofdw9u+q *5 yvre 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, the gdk:rk- -jqj z-y-- vdmass has position 2.0 m, drgyzj- -j k-:v kdq--velocity 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 surfaxu n*4*6g-yan fvt 7xlce by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right a4nfaul nx-67x vt* g*yt 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 e, +7l 1kl6xvbomxx*j f8,evz shown in the figure to the right is 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 movinglvl+fm 1xv, eobxzx76,e* 8kj with:

  00.32: A block rests on a flat plane inclined at an an*n-o5 yqz 43b 5: 1t8qgtswqwq jjl/togle 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 horifh/ +g5:xvs/:xniq2gm irig* zontal steel plate as shown in the d+i nir*h2gmxi/gg:5sf/ :qx v iagram 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 on an incli:6d bb971fdesaq4 xgs1 wjm :-xpan.tne 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 os bpa :f 7wx.d1a1 -ex s:t4qd6jmbng9n the block

  01.11: A 5 kg block rests on a flat plane inv9u+asrsh f2 ;,pbq2. yvah; vj*zw3q clined at an angle of $30^{\circ}$ 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 pli, m8x mln3v:j hbza(ifvuo8 7tq*n-m:nt/ ;cane (where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0uv 3ait:v8hqxo*c:t, izmbn( 78mj-/nnm l f; 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 gravitatio 3w5)l vkxkai;lbi 57tnal force of magnitude 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 thx l 5);53 wbvakktlii7e figure? The y-axis is perpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is ba 24 6+rh-0flul xmqjueing pushed at constant speed on an inclined plane. 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 surfacerqlm l4hu +a uf6x0j2- by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes z6 gp1kyizv jwa1 -agz*:0znyq:f 2r93dfj;z a block of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface incyrz0y2gzv:-q; a1g:6anjw i 3pzd f zfk91*zjlined $30^{\circ}$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 pl5r,;f ms gr ,l,wgvv 73f6i htgf,,upcane of angle θ . When released, the block does 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 ,67vgg,;hir gflm5u,,v ts,c rfwpf 3plane is 0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is2woz1vykh s++ released from rest at the top of a frictionless h1k+yvzs 2+ owincline. The inclinehas a mass M and makes an angle θ with the horizontal. 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?