07.10: Contact forces are examples of which of the fun6*q( puiiz v ec 0b0x6 kxjxpo+xbk4)as,:oa0damental forces?

  99.02: Which of the following terms is NOT related conceptually to the + /8m)r 2nwqmzlhdbr 2others?

  02.20: The graph shows the relationship betwer,;yy uzqa 98q; +zsvken 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;z, 9y+zq;a yrq8vuks :

  10.15: Three blocks, labeled w hxntg9o ,lq;.8mou1 A,B, and C, remain at rest on a table. The magnitude of the gra 91o hmun;t8gq w,o.lxvitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling byv:h s ljqqks5lf9g)la- 2dw)9 a series of strings as shown in the hsa:)qfgv9d q -skl9 lj2l5w )figure. Which string has the greatest tension?

  16.05: In the figure shown, the mas(p9lq; y vdlpy2z8ls j)h zh67s 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 connecting the mass zl62 9y)pd( j8lsvqplyz7h;h es?

  14.13: Which one of the following scientists is bdm)/ zrue j(4most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportionalubj/(ze drm4) to the displacement.”?

  94.26: As shown in the accompanying figure, a forceocbu+a. xwz5quh 98l6 F is exerted at an angle of uwu+xc 5z8ol hb. q69a$\theta$. 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 horvet m*+zlax vkla+ g6l .u+w+t421hwbizontal floor at constant speed by means of a force P as shown to the righax wmgtul+vwk+1vzal *. +642tl+beh t. Which of the following must be true?

  99.08: A weight can be hung in any of the follogr8r;aqrq-ap93 4abfr6u2l i ( ab x.mwing four ways. In which case is the string -i ra rbq9a48 mq (g3rxafrpu.ab;62lmost likely to break?

  96.39: Assume the objects in the following diag5 xk5ce1r4 7lu 3 yg*qb3spxsdrams have equal mass and the strings holding them in pb 5sc3s3rdxe5y7 gu1*xp k ql4lace are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerat 0k oq;,kfs+iae 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 0kf;qia+, oks acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass m n+)6ykzk 3v.wxz(wl-vp4bnd j+a 0djoves along the x-axis, at one instant of time, the mass has position 2.0 m, vzwj zyv nx+ 3 )ldjbp+-kvn46k(.aw0d elocity 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 righty p :uzyy,r9 145abyac on a rough surface by a horizontal force of 15 N94,yyzb :5rpuyy ca1a as shown, during the push, the object accelerates 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 box shown in the figure to the right is sliding to thbo+ 5a5trj3d2ykz mo my nn l09;;/yhze right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic frictiaoh mk 5y39zrn nt0dy 2;m+5/bl ojy;zon between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a fluh y5ww:v,yugk k374lat 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 steeibr73yz ush7( l plate as shown in the diagram Ar73iz( 7sbuyh .
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 inc* z bexcr+9zn4zczzs2knn3kl cw3-o *d6 y96 nline 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 frictionalnd9n3e*lbkzwr2zx n-z6 zn9 oc+c kzc3s 4y6* force of the incline on the block

  01.11: A 5 kg block rests on a fc1yusb d:dcj 8he840y lat 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 frictem67 bp -brsk7ion is significant) in inclined at the same angle, it will begin to accelerate 7e b6k pbr7ms-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 graviti 22gp73gy7ic,io etbational 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 coordinate axes shown in the figure? The y-axis is perpendicular to the incline’s surface while the x-axis is paicpigeib273 2,go ty 7rallel to the inclined surface.

  15.13: An object is being pushed u(cm 0mf)fzgo;fm,u rw20 xo6 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 normal force with the surface by n. Which one of the following choices represents correct relationships bf2;r6fmoxuc f(g ,om0zw )0m uetween

  08.20: A person pushes a block of mass Mfpng1w7ukv2;/2oa ah 4x /:n g dyrq6q=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface g 1/ufn22xohqd:anagqpwrv; 6 4/ky 7 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 oin/l6w bkmi2 .n an inclined plane of angle θ . When rel6ki /wnb. m2ileased, 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,m, of the block?

  17.40: A small object of mass M is released gv9e9 :( gq42:l)rj 4qsjfeby 4qpn ldfrom rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ wit4 n:lrv4ql9gd ):bfqsg yee jp4q2(9 jh 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?