07.10: Contact forces are examples9xr+m6 dfzuu /ra,yv. agg8sy 9b(j8e of which of the fundamental forces?

  99.02: Which of the following ter1vd-ikly,5fh) wd h(y7 54j uhcxljc,ms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mu2 p ezygw .9.klgc:a*:ycf6a ass of a number of rubber stoppers and their resulting weight on some far-off planet. Thafz wg.clua2y 6:kg:p*9 cey .e slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remaif1) 9yglgu3 irn at rest on a table. The magnitude of the gravitational force on each block is indicated o1ir3 y9g)lug fn the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal ma4j 4.xmi2ipvn sses are suspended from a classroom ceiling by a series of strings as shown in the figure. Which str .vp i2jmx44ining has the greatest tension?

  16.05: In the figure o:dz 60kw w64q+,q,ors jxvdoshown, the 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 the tension in the string ckw qxdq4+jo0wzrs :6v,oo d ,6onnecting the masses?

  14.13: Which one of the following scientists is most asspf0sdm bp2 h.i*l)aywp4e7.l g5rv( cociated with the following statemev ef(d4wi)p.m*h yc.ar70plb l 5s2gpnt: “For small 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 q 8mkh3xgfnaz *14m4 pF is exerted at an angle of z4 m14ngam fxk3q*p8 h$\theta$. 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 horizjb 8t6ft,fz.xo,fw i8ontal floor at constant speed by means of a force P as shown to the right. Which of the following must 6ib8tjf ,w.o8fzfx,t be true?

  99.08: A weight can be hung in any of the followi v-9 9q8qovtbung four ways. In which case is the stringu99voq8t -q vb most likely to break?

  96.39: Assume the objects inonz h+n(07q-f x;4depty+1 rhjs/k yj the following diagrams have equal mass and the strings holding them in place aryq p/zd+kf 7n r;hx 0 jy4+se(-njot1he identical. In which case would the string be most likely to break?

  16.10: A person wish-j sm qf0 xc)4+dfz rwgu0r)b3es to accelerate an object upward uniformly. Which one of the following choices must be true of the force F, provided b zrb 0 j)3rwfcx s+f-dq4)um0gy 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 ic+w5iu dq9lr.)5p:b4w tlpuxnstant of time, the mass has positi + t4w9ipurd:.c)5pxb lw 5qluon 2.0 m, 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 surface by a horiiqse f5mprh:yt b s8.9s 7)x,r- mvmq,zontal force of 15 yxv,mm -h7qsm ps8sfr r5tb:q)i.,e9N as shown, during 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 fi+ymmatuh0rm 4pi.0.hwrr xi7.)/mi i gure to the right is sliding to the right along the floor. A horizontalh. 0iu +/ymx74ta irm0.wi)rp.mihrm 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 moving with:

  00.32: A block rests on a flat plane incli7sb-u-ejnl zbvnkch6sp4+325yn ioj1 p;s x3 ned at an angle 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 steelk5s) r gp8yi3dm 4r7hl plate as shown in the diagram )rgdsp k 375my4 hri8lA.
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 wif3vf) la0l1 ulth the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional a f3l l1f)vul0force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inclined at aivti 2*6 +hvlsn 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 plane (where fritoaco8-sk2ii5lf k-k5 z4r;v ction is significant) in inclined at the same angle, it wi 8ota5f - z;ok2k iick5l4sv-rll 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 ocww5mt atnij4-x 2)1h*n tjm x4m(3hvf magnitude N 10 acting ohn xw 2jm43vc*txi ttnahm 4- wj1m()5n 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 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 pl,4;ik) vj rkiyk id(ng,5z2 bjane. 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 following choices represents cgrny vb kjjd)i2z i5k, k(i;,4orrect relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constantzf) eg6hzc-;myqmc3vz b 6m0 d24/trm speed of 5.0 m/s straight up3f6zmcg 6b4 cmv -0mtqr2zd h/yem;)z 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 ofpepr*g9+a lb:9ns ;ur mass misplaced on an inclined plane 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 statibnar*:pps+9 rg9le u;c 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 mass M is released( ,y jydahws260c0* wu )jmbxz from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at restoy 0js 62,0wmb*(ya zxhcdwu j)n a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?