07.10: Contact forces are examp6n;:vl;prund)e6, wi dwoor 3les of which of the fundamental forces?

  99.02: Which of the followingrd+/cfb. 6tq,ad 5b )80iljdazlj: gr terms is NOT related conceptually to the others?

  02.20: The graph shows the relagg 9;:,5slf ,gstozt ztionship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the gr g,z ozgg5fsst,9tl :;aph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. Theb1pdkn-2u45 qmr,,prmgsyi+iki: w 5 magnitude of the gravitatiwkki,g s+1rr -b:ym,p q4p2iudm n5i5onal 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 by a3 htjdhq.8l3 b series of strings as shown in the figure. Which string ha3 jqblh8.dth3 s the greatest tension?

  16.05: In the figure shown, the mass m c **wt)4ej (hbgvnhy1h+bkhqqy1b, 4 = 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 tensio1h,y ehbjc4t4+hhnb1qbk(*w vq* ) ygn in the string connecting the masses?

  14.13: Which one of the following scientists is most asso, r+o1wecsaa9 g .eo4wszcv;)ciated with the following statement: “For small displacements of an object from equilio aesceo sv 9wr cg,a1)+4z.w;brium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted aqmuesnte3 h;279uwv jk/;rz 2ies03e t an angle of j2sv92qzu3n70rhe;uik;s3mt / ew ee$\theta$. 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 rougv18nnea -hv0p, ag0d kheog 99h horizontal floor at constant speed by means of a force P as shown to the right. Which of the following muag0va9,negk dv n9-h18p 0ohest be true?

  99.08: A weight can be hung in any ofk83exidfm+ )y, rkol1 the following four ways. In which case isdikm, )y 8ok+ l3x1erf the string most likely to break?

  96.39: Assume the objects in the following diavaj7f5cdm-1 uxxy )+b grams have equal mass and the strings holding them in place are identical. In which case woyfa+vx1b d-x m5)7ucjuld the string be most likely to break?

  16.10: A person wishes to accelerate an ph b9 bvy -+cp7 t7+eun1ip:paobject 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 p t+ 1eya7ph7bb+c p9p nu-:viof 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 instan-yc 68z: 3r4yvv mzmsxt of time, the mass has position 2.0 m, velocity 3.0 m/s,and accelerationmy43x 86-vszzmc vy:r $4.0\;m/s^{2}$ . 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 horibr/r3; u +bc 6r krk7u3(ekowzzontal force of 15 N as shown, during the push, the object accelerates u(weu ckr/ruk;o z7 k3rb6br+3 niformly 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 /im as4bs02knr2zc .vthe right along0/rv amscs.bz4 i2nk2 the floor. A horizontal 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 flat plane inclined at an angle +hnylpzz5 ,w;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 m4)e2*8s a ljdg6ab*w-nqwdgpulled across a horizontal steel plate as shown in the diagram A. ew j68m*w*d nq)as4b2-al gdg
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 horizone4q1jo a1j;a0qcjnqvh-d5 7t tal. The block remains ; d0 -cjaqa4 enhv1q5jqt j17oat rest 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 planew;a0p6ylthb90 qm 1)s -c0igsdgb .oe 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 se8hcy2)2y sivgd2 wos(d7 q h5bcond 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 )i8 bsy5oyshh2wq( dg2 dcv72the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force ofgm--u0: jk8ritbm3in 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 perpend3 :kii-tjgburm8 m- 0nicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed atk;hnq:n )v6 9sb/ vdav 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 correcthd:v) s nvbq/av69k n; relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed fs6:na *s. gy 61ujvqpof 5.0 m/s straight up a flaj6svu 6a y:* pns1g.fqt 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 . l0y i/e;qqqy()y3blh yd6t ;tuh7vr * 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 foh)*;l3ev/ bhq(t6 ydqr uyy0tly;qi7 rce 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 fr.i8d90;k -inm hiiydvh1b ykz+ 9-klpom rest at the top of a frictionless incline. The inclinzkydk 8h0 vyiip n. -1miik9b9+dl- h;ehas 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 incline?