07.10: Contact forces are examples of which of thet0 y. 5b6tyq whsqcxr*+,lnhz0yzm, ( fundamental forces?

  99.02: Which of the following terms czcavz)2g : )3rmdcw 6is NOT related conceptually to the others?

  02.20: The graph shows the relationship betw7 hkd v3+ j(v*mtk:lomdn2 d-ween the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the gra7nd2 tj ddv -mo:*kk3w+v( hmlph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, nzt+ -2jo.( tvp g +xgpuy1 laepx3-z.remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnl-y+tgz (.tzj+ap-g3popu nv.2x x1 eitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a 9v fk*00lpxezz o4z s8series of strings as shown in the figure. Which string has the greatolf0x0 *p8zzvesz49k est tension?

  16.05: In the figure shown, the mass m = 6.0 k。4ch,bbeo) om6larsf g:,m: ,aand 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 connecting the obf:, :raeao4) bm,,g h slc6mmasses?

  14.13: Which one of the following scientists is most associated with thu+ 5f3y:pk joie following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional 5i+yk u:fpoj3 to the displacement.”?

  94.26: As shown in t sl.63(e(om5f ;zh,aro vv)+w jbtxklhe accompanying figure, a force F is exerted at an angle of vj,x. skev f lh z5+)6w(bot rl(m3o;a$\theta$. 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 pulkbpv* r5bpz sn5*g( /qls a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the rig vkqnp*5rz*b s/5p(bght. Which of the following must be true?

  99.08: A weight can be hung in any of the follz3uyu :hjkkn d0x(32jowing four ways. In which case is the string most likely to break? 3h2knyjjkd:z (03ux u

  96.39: Assume the objects in the following diagrams have equal mass and th lmo3ml6 4(thte strings holding them in place are identical. In which case would the string be most likely to breth(4ol6m ltm 3ak?

  16.10: A person wishes to accelerate an object upward uniformly. Which one9qv y,0,i7imk br,ji) 5qyrev n rgn:) of the following choices must be true of the force F, provided by the person onto the object? W represents tn0kyr5ebq qvmi,n7,vrjy:)i ,9 ig)rhe 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 ma uq8 )+6b*j(tl5-v vu hgsehiwss has position 2.0 m, velocity 3.0 m/s,and accel5eqtl bhs+wv)*uv6 j(h - iug8eration $4.0\;m/s^{2}$ . 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 bn.br lq1k8p4dy a horizontal force of 15 N as shown, during the push, the object accelerates uniformlyp. nl4q1kdb r8 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 is sliding to the ros+ fo(n, rookd .a;1cight 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 thecro+.f1no(k;s doo , a floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inc w juj:ty h.dpal7m59yqq8+v(lined 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 ac.f r8u4erk.x db75 pgeross a horizontal steel plate as shown in the uk 5xpdg.b . ee748frrdiagram 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 m/d 1nypr. d1hoakes the angle θ with the horizontal. The block remains at rest as θ is slh odrdn1p1. /yowly increased. The 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 fl(d8 s-k6 i1y0pwptq rhat 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 second plane (wherv - )15e i ytd2ysgkqnba8,2vie friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block an ,i8)gkin1v2yet -vay q52sdbd the second inclined plane?

  08.08: An object on an inclined plane has a gravitatiq1 :m4,ocrt6cg;lpsbonal force of magnitude N 10 acting on it from the Earth. Which of the following gives the correcp41gr blc,;s co6:m qtt 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 conb*ts0e xi- mbcwn1q .4stant 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 surface by n. Which one of the following choices represents correcbbcntmx4 qw.1se*i -0t relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed of 5.0hj o* ,jq(ze r*jt6i,x m/s straight up er jti,(q6j*ox hz ,*ja 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 0k6 a+ *tve ni30ml(qvbq1v,ttki30q co ,yxm 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 yko3v0*a,tcitqb10ivn lv+mq0 e x6(tk m,3 qand 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 fruj(ec n h5qtfahe*44:om 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 for(uhef 4q*jce45ht an: ce from the table on the incline?