07.10: Contact forces are examples vqp,qjy ;sfnw*h k9 s )-y-ld:of which of the fundamental forces?

  99.02: Which of the following terms is NOT relate dir g8p/,c/o v.zdb)oayz8 4hd conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber n 8l:ek 4ct0 2mmz,aqrstoppers and their resulting wec42:nlm q8e0atr ,kzmight on some far-off planet. 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. The magsud,6y6m sif ,nitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact i,s ,mu6sdfy6force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling bnttbb0n8/+sb kn8 chh*+j 8y by a series of strings as shown in the figure. Which string hat/t*b h bs +8yj8n bc+nb08hkns the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass avf x vv/*6e :sxoj c)x.n e5awei6*4sM = 14.0 k。are stationary. The mass M r/v*xs w)6 ex6o i:nfse*jxac avev4.5ests 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 scientists is moslp ; o;vsfw, nj5kq1rrj)7fn 7t associated with the following vlo7 qkrpnf;j j1r;w7f5sn),statement: “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 acv m(n57.d+)lfm ) nybbq tfx*bcompanying figure, a force F is exerted at an angle of x fbtyn+qfd nbl)*v5). b7m(m$\theta$. 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 floor at constan7e.ckq ch69gft speed by means of a force P as shown to the right. Which of the following must be truhgq e. 9k7c6cfe?

  99.08: A weight can be hung in any of the sz .egfd4v29rfollowing four ways. In which case is the string most likely grfd z v42.9esto break?

  96.39: Assume the objects in the following diagrams hahsnld.0 v. negqdm ew++r;z34ve equal mass and the strings holding them in place are identical. In whiv d.d+le gwq.;nns 3ezm+h40rch case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which oned)na eyt1so43:h gnna6 j ;ba, of the following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acts,n)4;a:a3g oeh6nnd tb jy1a ing 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, y- drxb*0n sg(the mass has position 2.0 m, b-0(*dy s ngxrvelocity 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 ro2lx3*cyt;tfri5 k 1 zkugh surface by a horizontal force of 15 N as shown, during the push, the object k 5z31y tt; 2c*rfklxiaccelerates 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 b mehcq4 4cp e7+h)tl) cb6fu6cd.ol0box 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 edehc76t4)46bc+ c.qp0 ) homfcu b llright. 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 ab venh1za8p/k- cy/zn h,:h e- flat plane inclined 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 aa(t wk.9fh(rei7c u4c horizontal steel plate as shown in the diagr w9 tk4e a7((ui.cfcrham 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 trt,w -rj le4i s51azg;hat makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. r w5r les;ij,g4at 1-zThe magnitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plan g yfl nvob45y.zgs/a.;.5eiq e 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 puqz -pmkknj/2,-*qzsecond plane (where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of frictkzk- nqu*j/p q-z,m2pion between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational qelx)m1y 5 r,l7 gqt; 8h*ebj5h+yiutforce 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 the figure? The y-axis is p bgh h7ru5, ex) 5*iyjq+8tyteml;1lqerpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant96rykb 9o nu,; 4kdkxn speed on an inclined plane. The free body diagram of the object is shown with the gyok,r99x k nkn4b du6;ravitational 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 of maddh4g g+ -ao6qss M=6.0 kg with a constant speed of 5.0 m/s straight up a flghq-d4o+ad 6g at 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 bloc, fj hw+w yo;hk87l 7rr5lzor6k of 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 static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass ywr;75w 7k,z hfhrr+8o6 jllo,m, of the block?

  17.40: A small objecj 1g/ 0-wi5ezsq427n*k trmqtl bm2rdt of mass 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. The incline remains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from t 1m k5qgrbtmr4q2ne0j* -ls7z /twd 2ihe table on the incline?