07.10: Contact forces areaqq8* 8 )mf0hiftq v:j examples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the others?5hj1, bv*fuvul x8 l/pk :lhd.

  02.20: The graph shows the reldo-n27y)un b fationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a r7ub-2 )noynf depresentation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a tablevp 8 /oo *n-try/s(hln0:rakf6hd:fl. The magnitude of the gravitational force on each block is vrlf( n rh-6syd/* o:o fhkntp0/8:alindicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are susq/j)o ie0lm(q pended from a classroom ceiling by a series of strings as shown in the figure. Which string has the greatest tensilqj0 o( q/)mieon?

  16.05: In the figure showw6xs9,do l+:t hhj x-pn, 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 conxsdp+ -6,tlox:j hwh9necting the masses?

  14.13: Which one of the foll/k.xnaaw5 n;m mqi+1vowing scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proporti1 mv5wk;qia/am+ x.nnonal to the displacement.”?

  94.26: As shown in the accompanying figurh ihu 50m cu:zzh,ky60k .9vvhe, a force F is exerted at an angle of u9hm:zhckh i0vv6ku,h y5 0.z$\theta$. 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 alongd;ev..w6 kffrb* m ce1 a rough horizontal floor at constant speed by means of a force P as shown to the 1kf6c;v*er .b mw fd.eright. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In which1,ulqvo)ib 0tjbj )mq2g- m+j case is the string most likely to bre2jvjqm-,m0o )1ugqbj ) ti+lbak?

  96.39: Assume the objects in the following diagrams have equal mass ad : w8xugtkfimt 8fp47gh7y(6nd the strings holding them in place are identical. In which case woulg8gtfi 6f7(m8utwd4ky7 : hxp d the string be most likely to break?

  16.10: A person wishes to /2 tas:dn y okd8a hxq*4n.c4baccelerate an object upward uniformly. Which one 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 acting on the object. Ignore any effects of 24on*sc4dy: htqad n k.a/b8x the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along thyzr3mwp d q5/i7;w dw5e x-axis, at one instant of time, the mass has positipirdw 5mq75 /d3wwyz; on 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 hcyli)*qg- 3j-m m 9u8u+iuipworizontal force of 15 N as shown, during the push, the object accelerates uniformly topucwg i+q )m*9i3-uuim jy-8 l 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 thi/tuunm) 4l .p0a9d pve right is sliding to the right along the floor. A horizont/ptv. nm p4ladu0u 9)ial 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 inclined at an angle rpgm is :oh/71:pndo8 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 hori :emuhqiy3n30wg6wlk r3. 5av7qb 0wwzontal steel plate as shown in th.qy5klgamn70u3 w6b3 wi ve w0r3w:q he diagram 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 ankjr4 stg(j5,d8lw jbqndm/ -( incline 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 b(/4jgdk,mjn s8 (- jrt5wd qlof the incline on the block

  01.11: A 5 kg block rests on a flat plane inclined at an aeqzk/6 efe/v l8/1 +mqof qad(ngle 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 friction istu:5e.brr sl 3fx+ )rx significant) in inc53 fe :uxrxbs )r+.rtllined 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 gravitational force of m h4ysrxr3:wlq9hx6(u c g8/ *mvbh.moagnitude N 10 acting on it fromvmhhc6u sb 3:w(r48xxg r*yo. q 9hl/m 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 be6zl cjx( kr)z+z wv p7vwn:tv-y-/)vxing 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 norn7+:v)y zxpv-(rz 6) tzjvxww-/clkvmal force with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a pp1hu0 e8rbe :constant speed of 5.0 m/s straight up a flat s:per1he08 b upurface 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 inclined plane of angle θ . 2jnooxe6 cmr9o-)wkswrq;) naj9: 4 mWhen 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 betrj9)n- nc4w:2k;oa e)wo9mjx or 6smqween 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 from rest at the top of a frictiov ja976r- ecpfnless incline. The inclinehas a mass M and makes an angle θ with the9r7-ap cje f6v 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?