07.10: Contact forces are examples of which of the 5ak+8e4 9dv bj0fcur cfundamental forces?

  99.02: Which of the following tg) y/difw81 ;ua 5gutverms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number o giikbc/ i5(v0 6 2d1p :ya3*sqpibkbmf rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a reprb iqm2 d b3a:6ikg5kip cp/v(y*1sb 0iesentation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The mag 1egao6x+05 br ekut:g stor o29hg7s+nitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C fromso r27+gtkeg+9 6uoxt5:eogrb10sa h block B?

  14.04: Three equal masses are suspended9ix9 ka+cf ns.b9x1z0 e(pbt s from a classroom ceiling by a series of stringicp9xa91 .(9xs+b steb 0zfkns as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the ma +c fdzk(9gzf4ss M = 14.0 k。are stationary. The mass M rests on the floor. Which k+ fz cdgzf9(4one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated w/o :wxnl. h:m/tgom/ zith the following statement: “For smw z//ommg:oh:ln /.xt all 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, 2u w*k. ctc1i-dib/gza force F is exerted at an angle of g it*kduc2/ z-bcw1.i$\theta$. 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 abjit f-364opws efz7/ wooden box along a rough horizontal floor at constant speed by means of a /eb-w4t63oifjz s p 7fforce P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung ibn7x bzoj;frwe+xv.vaoj;az144: 9nqv 9 pv)n any of the following four ways. In which case is the string most 9.v)pzbaqnz4ofj v b+vx rw:;74 a9;n oj x1velikely to break?

  96.39: Assume the objects in the followi7o0 o4mf 2* *box fh0ihbr, re+vhdr.fng diagrams have equal mass and the strings holding them in pla* ,of0. hr* o x4bm2ir0h+b7drv efofhce are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward unif8v fziroa/6pi .la;thy(5rnxb3 : h5j ormly. Which one of the following choices must be true of t(btraa8 5o.ynjx: h6 izl;h vf/pri3 5he 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-axis, at one instant ojhcyo 3 *h2c 25b62 gtkj1rnodqzc8-tf time, the mass has position 2.0cnj1ohcd 8 yktr2 hj623qgz*-2ct b5 o 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 ro ,lujldvh hy3lk9 :45gugh surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right at l5k9vu3hhlgl,j:4dy2.5 $m/s^{2}$ . 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 gp8n7 vi msxh3: /t,st m8ad-pright along the floor. A hord8, snxit sm3t p8h m-g:/pva7izontal 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 s u:a9 amyf -p4b; dtfydz9v/1on a 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 a horizontal steel plate as jcvoli+w hz 269*0qqvshown in the diag69j0 q* ci+l2v zohvqwram 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 horrfx , c i1vrm,pjl(utb/k:0;u izontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the incli/r txkmv(pr,ufi buj1l,0 :c ;ne on the block

  01.11: A 5 kg block rests odulv:ke)(.f2nr p,68qs f,uj d iz8pon a flat 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 (where friction is signifiy8 (1ct e5k3rfiyphz.cant) 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 and thy8f1kr35(pz hct.y e ie second inclined plane?

  08.08: An object on an inclined plane hasp/(su(7cqk t/cvv d*i a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the cv udkvc/s*7 i(c( t/qpoordinate 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 kbsl8- i)ow)c constant speed on an inclined plane. The free body diagramsb8)o w-)kcil 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 correct relationships between

  08.20: A person pushes a block ozj4 gq4uvc ;m,rlo um(ei+n.2 j -of2xf mass M=6.0 kg with a constant speed of 5.0 m/s straight up grf 4 l-moi;zcm,o u4v2 n(j.xeq2u+j 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 2gr5 ky1j(ucq on an inclined plane of angle θ . When released, the block does 1kg5c (uqr2j ynot 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,m, of the block?

  17.40: A small object of mass M is released from rest at the top of a frictionlpt ,.(zh+2uth m1eyg less incline. The inclinehas a mass M and makes an2zghpmt ye( , .l1uth+ 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 the table on the incline?