07.10: Contact forces are examples of which ofo/ph23o*do x-8y1yvd .vmg8sk3.jo b /z dbnl the fundamental forces?

  99.02: Which of the following teh))phr9tm0ya,u( xx)cx d iu9 rms is NOT related conceptually to the others?

  02.20: The graph shows the relq)x d0lsbso8g/ 1-swdationship 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 representation of the wx s1qs0b8-sl/ )ddog:

  10.15: Three blocks, labeled A,B, a* p g7b v3suqv0 m2jw+.elm6dfnd C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What ij0lb* m3q7u6gfve v pdw+2m.ss the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended fuj+ * yh*r11ccdsw4;lb8l gdyrom a classroom ceiling by a series of strings as shown in the figure. Wh*bcdd1hyr* s;j48g1 lw yuc+lich string has the greatest tension?

  16.05: In the figure shownb-f :8l)qk m2wk2,d0wsifeh o, 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 connldb2s0-f2w:kh8kf i ,em w)qoecting the masses?

  14.13: Which one of the following scientists is most associated with the followian4 ed;syn +53yl:vi qng statement: “For small displacements of an object from equilibrium, there is a ressi+l;5 3 :nydny4qev atoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanyb reett qy9ls,0 d5rp h(e+h.w3alf(-ing figure, a force F is exerted at an angle of y+ f.pdh3 rar5tqtbes(lh(we9-0 e,l$\theta$. 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 constf5)ep6+ j1md5rt lcwt ant speed by means of a force P as shown to the right. Which of thdc lw5f)p5e1 tmj6 t+re following must be true?

  99.08: A weight can be hf0t:yy nqoa7 ,fst2 1rt5bpvyxr3, 8hung in any of the following four ways. In which case is the string mo2nf7s:ybo t,5 rt1a8fr,qtxyv 0hp y3st likely to break?

  96.39: Assume the objects in the following diagp 0+ l:fmfv+svrams have equal mass and the stri:v0l+mfv+s f pngs holding them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes t/f/kmmct8f:qc ye*d* o accelerate an object upward uniformly. Which one of the following/ftk*em:/y8c*mq dfc 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 the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-o28 :,lp oue2upti c(jd,xz1k axis, at one instant of time, the mass has position 2.0 m(,p1ko pot jce8z,u:dilx2u 2 , 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 u)o wk6ni4fz2 2 3lsybright on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly t fwybn 42i) uoksl6z32o 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 gub p3(kmt5o4 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 right. The coefficient of (gp 3tkom45b ukinetic 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 cw3f/ kfemn.8fvr 6 x-c hnl)7at 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 alz0 d8dbw *6ls horizontal steel plate as shown in the d68ld*0s wb lzdiagram 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 the h(: f7 9eo e1tayrof+sworizontal. The block remains at reso(syf r7e+ef19 ot w:at as θ is slowly 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 flat planep.w;zclw,o wp6 v(uju v.) -dy 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 7 3llhrhfp/7q second plane (where friction is significant) in inclined at the same angle, it will begin to acceleratel p7r /l7fhh3q 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 grwfq5+ zp.j3gro f /fziy7w /+lavitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the cfigjol.5 fzf/q / zyp3rw+ w7+orrect 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 pushb 89z(m/wonki,1j )vogx( 8rvmu; sweed at constant speed on an inclined plane. The free body diagram of the object is shown with the gravitational force re 8smw(g) iweo omn1;b rkjx98uvz/v(,presented 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 f.w ycw7z02mj block of mass M=6.0 kg with a constant speed of 5.0 m/s str.z w02mwf 7cyjaight up 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 inclined plane of angle θ .rexs;le6u:/ gun v6jdx 6th5 9 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 jxx5eh9 :6e ru66nuvs /dtg;lof 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 mass M ro+j .0swna a/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. Duringoaw as0+r. nj/ the slide, what is the magnitude of the normal force from the table on the incline?