07.10: Contact forces are examples of which of the fuqdw ./nmh .yz-ndamental forces?

  99.02: Which of the following terms is NOT related conceptually to tlq7us c jfxq+ :66hmy+he others?

  02.20: The graph shows the relationship between the mass of a t 39atrlm*4 yevw6e h(number of rubber stoppers and their resulting weight on some far-off planet. The slope of*tla 4ehmt(e3y96 wrv the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The magnqteqy pzvo/1./ar0baba 99l rr4 8(rqitude of the gravitational force on each block ./t aqr braqp9 4/ 90bzyrrv8o(eqla 1is 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 ceiliv .mpbxmm36yg )b jjv5ii 5w,:ng by a series of strings as shown in the figure. Whichwpjb6j,)xbmm : .v5 3iivmy5 g string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the ma.dzen/ nbsz6*)4tu-vr;f. zur 7u qfiss M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices reprf vt)e6i-fuu/d z 4*.;nzqz.r7 nurbs esents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most asso*kkzq u/kw 4ckf:(9ktciated with the following statement: “For small displacements of ankk4 k*qt kzk/f9u(w c: object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying f/;(iz 4n.uko* c yfozgigure, a force F is exerted at an angle of i/.4zkcy;ounf* (o g 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 along a rough hori0r.q x5c,cr d;h iifb6zontal floor at constant speex6fb d,i hcc r;5riq.0d 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. pv+ o;u;vy -cy In which case is the string mosvp oyy-v;+ cu;t likely to break?

  96.39: Assume the objects in the following diagramuzs.l3.xu3hrk qh;kz xtxr a3 yx*.d 80-o z,ms have equal mass and the strings holding them in zd.3l3zo* .krx;yuhx- msut, 8 r hzkxq.0xa3 place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniform; u;qqf) i2e-ilys35khpulp/ly. Which one of the following choices mus-iyuqph3kq2;l; 5p / eil su)ft 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-axiszw7oi8o56 i8of. wu tl, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and t o87w6il8f uoo5w.z iacceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed to th*mjs3-txi 4soe right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates unt 4os3im*-xj siformly 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 ritg:3 l;-q :nuueyat, izl(ki6ght is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction betwee nug t63ty:i;u-l,(:elzika qn 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 angll dfehze7ca8e:3h j l -t*bd u4.g+9gye 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 showh5zvb v*x;3wbn in the di5z*xbh ;bwv3 vagram 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 xh(.uljo4miem 3p n,8 with the horizontal. The block remains at rest as θ is slmpin(ol .384h xm u,jeowly 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 inclined at an angle of:k32m3 c dcmha-p.;wl3r xtam $30^{\circ}$ 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 sr*u;8;sfg mp 5 )-qwqmevix1recond plane (where friction is significant) 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 the second inclinedrwi mx* vm;5frse;gq1 qu- )p8 plane?

  08.08: An object on an inclined ulz-9 ym*o .rzzh-h3 tz,ndg:plane has 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 coordinate axes shown in the figure? The y-axis is perpendicular: g dytm.nr3-l- z ,hh9zuz*zo to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant speed on an inclined vdo2bey*8+ a+e6f(ib6 vehy p 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 follow*y (h p6beve8 2e+a6+iy dvobfing choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.fg+m r;xbr9 gbi62 8+l;jgnrf8v h,tt0 kg with a constant speed of 5.0 m/s straightb2m g 96i+ 8bh tf;rnrjg+g;lfrxvt8, 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 mkc r 67oqeg8o1w7v nv5ass misplaced on an inclined plane of angle θ . 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 of staticqv78cn1gke7o5o6v wr 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 poq0 v3hum0i d*dm d(: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. During the slide, what is the magnitude of the normal force from the table on the incihd(q*mp:03 m ddovu0 line?