07.10: Contact forces are examples of which of theul g;gj.k(4d v fundamental forces?

  99.02: Which of the following terms is NOT related conceptuallqtl.vj h3;pg hkcbxx8h:j5:mu :, 9jfy to the others?

  02.20: The graph shows the relationship cofrq )pwjrki: ;6 71hbetween the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of qo; wprc:i7)k1r6f hjthe graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The magnitu 4gpl1*yu7yvs)yd zk ph/5d+pde of the gravzpph ldd 15+pys/4v yyg*7 )kuitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a+a 22: h:cxdguc t(ww0hq,hda series of strings ahcg 2atux2 wq+hdadw0 :,h(:c s shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0vlcn614,o y kw q4 cb8vnhzhn,4z7tw4 k。and the mass M = 14.0 k。are stationczw7nbl 4zt, hk4vny 6 4qow1v84 ch,nary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following sc twd; sla,m02oientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportil,dwm;o20t s aonal to the displacement.”?

  94.26: As shown in the accompanying figu uj 0ryjisr.mb0 3,ru5re, a force F is exerted at an angle of 5,3 jrsruu0 mrbiyj0.$\theta$. 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 along a rough horizontal floor2yz f k7z6z(s 5rsmac9.tqnm+ at constant speed by means of a force P as shown to the right. Which of the followi( 9k7zz5atms n+.m2sfycz6q r ng must be true?

  99.08: A weight can be hung in any of the following four ways. In wead79 zk(;5dx08zp p2hwmku dhich case is the string most likely to break?m 0za ppdekxdw87; uzh9kd25(

  96.39: Assume the objects in the following diag :xspj+j6i nx+row9f* /+geuorams have equal mass and the strings holding them in place are identical. In which case woul r+s/jpf+iue+n: *96w xjgxood the string be most likely to break?

  16.10: A person wishes to accelerate a h, d79 ldfmdk)om.zj0n object upward uniformly. Which one of the following choices must be true of the force F, provided by the personm,h 7kz.d)jdmd o0lf9 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, a8x)c ncn8 kf- 3 8br7gc7-pidmv enc7mt one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and accelernx83knder7vcn8-f8 c)p 7g cc-b 7m miation $4.0\;m/s^{2}$ . 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 surfacl 5uk kg d1l+1tlw1qg+e by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the riglltkg +qwu5 1g1+1kdlht 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 fi lxv4liap)9k+3 4c ;lqtueu.hgure to the right is sliding to the right along the floor. A horizontal force u;l qihp)c4tvkl9 ex4l .u a3+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 moving with:

  00.32: A block rests on a flat plane inclined at an anglv.,px. kw2 4r,8tg,nmb-z2ybba +xb+wvyh jw e 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 horizoapem: 9lalj ;4ntal steel plate as shown in the diagramm:jalpe9 l4a; 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 incline that makes the angle θ with theynnqh q 1yt84;k4kvhxp 8bb89 horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of k88vpnt;qynqbk9x b81h4h 4y the incline on the block

  01.11: A 5 kg block rests on a f/lcsm6vh6 yozdt:o2 t+ fs p7:/do1wnbc06oi lat plane inclined 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 s8k qf*r q.(v .b(b.mrjgarch9econd plane (where friction is significant) bm9r( b. 8*fk(.jc raqrq vg.hin inclined at the same 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 gravity1dg 6tv 3 d5hiwm7*axational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravtv1 *gdxmi5 3d6 hya7witational force for the coordinate axes shown in the 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 being pushed at constant speed on an inclined plane. T*y0w2obzc ge g qabg9gu t4;44he free body diagram of the object is shogu gqzyo09g24 abb4; g4wet c*wn 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 following choices represents correct relationships between

  08.20: A person pushes a block kvi8 yyp psaumx :; ;:9s.f f8jm3e6gpof mass M=6.0 kg with a constant speed of 5.0 m/s straight ufpfe :j mp;3kxs9ypuy:i;g .ma86s8vp a flat surface 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 incld.jo )r-acllz3-x4 pq0 k 2gaiined plane of angle θ . When released, the block does not move. It is determined3loi daj4apcz20kqrx-. g- l) 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 qm d(j(/wamt :mp(lo, 4+f fpom/f-lrmass M is released from rest at the top of a frictionless incline. The inclinehas a m,ml a o/fd(oltfqmw-j(4rf mmp+/p:(ass 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?