07.10: Contact forces are examples ofmn0h-k6sr wlki /8zk 2 which of the fundamental forces?

  99.02: Which of the following terms6 ygn bfep(83w is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number 9 k-brop.rhv kwfu3; 5z:3 rbtof rubber stoppers anrhvk;9w tu3 :.5fzokbp 3rr-bd their resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest o qgc.n21k+yixp5blt+ n a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contacbq5c1ntp2xl .i+ +kgyt force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling bqy)(cxz 7aip+ih( :o by a series of strings as shown in th ch(izqp+oixb)(y a: 7e figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。arup7meubps9se ;hp5 u: vzso1)573kph e stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string cp k;p) e hsm1v5h5pu:ue3o 7 uzsb9s7ponnecting the masses?

  14.13: Which one of the following scientists is most 9pi3f ,zmtl9lja7-if0j ujc,5m 0k fxassociated with the following statement: “For small displacements of an object fro mmz35fil, fj9-jfkt0,ai90c7 lx ujpm equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in talxc* 6yz-m,rhe accompanying figure, a force F is exerted at an angle of -y r*xlcm6az ,$\theta$. 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 floor4u; kdp9v q0y:zmhxz- at constant spee0phyqzvxz-:kd 4um; 9d by means of a force P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In whict ophx5xp)y6:g7 a 2fsh case is the string most likely t gta5fyx)h s: op6xp72o break?

  96.39: Assume the objects in the following.yp/ 6 ij1pudl diagrams have equal mass and the strings holding them in ppl1pj6ud/ . iylace are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object ugg zohn89fc gf35/ 0yjpward 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 cj z530ny 9gogg8f/h fof 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 in :*jael/zopj op:-xj. stant of time, the mass has position 2.0 m, velocity 3.0 m/s,and acceleratijj/pp: -joo.xz:e a*lon $4.0\;m/s^{2}$ . 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 horizocwnyn 6yt3 (mx :n xjumt6hb0 zx97.s+ntal force of 15 N .tn7 mny x9c n 0(u3z+ s6hjwby6:tmxxas 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 5.nt+g;p kl 8o8xfmdvit6e30dzx1. hepf4 tz shown in the figure to the right is sliding to the right along the floor. A horiztx1ed 8xt8 dtzff.+kmh p el4;v60 zgon i3p5.ontal 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 flr7 z;23nzdd c4k nju(nat 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 fij9/9r6ud tna76e w niprst pulled across a horizontal steel plate as shown in the diagw6 9 pn76dr9n/ie uajtram 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 horizoh+*+spliwb1 cz1ov r 4 yt.r8wntal. The block remains at rest 4+wrl 1tc1os +.rbp*z yhw8vias 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 plane./ fcaqyntyi h 8s1 h3lxag.1cc +;r2l 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 signhn wgj8x3+b t*ze8 0asificant) in inclined at the same angle, it will begin to accelerate at 2.0 me* +jh8bw s38 tazxgn0/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 o+/x nch0o0f ;jnv7g kh0 .tetnf 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 parallel to the inclined surfa0. 7xth /0 kftnhcoj;ev+ n0ngce.

  15.13: An object is being pushed at constant speed on an inclined plane. The +k*t7lslo7idmv*9h 9i cxk f8 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 theocxht9k 9d+7k7li8vsli *m*f 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 of ma 5mo0 g;ubxwm9ss M=6.0 kg with a constant speed of 5.0 m/s straight up a flat sur0go 59u mwbmx;face 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 . Wklv3ib *sk l1s. +e,8tf5qzrsgd1rk (*dx lj+hen 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 frictiqd*dbr.g slvz538r ss x,+lki+ t 1l*1ejfk(k on 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 objec n;msk (9fdx*ut of mass M is released from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle u;fn* (dmxsk9θ 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?