07.10: Contact forces are exacv *xv 4qrqzb4y;k3w; mples of which of the fundamental forces?

  99.02: Which of the following a;qoea8*dqz,yrsy 7mm*1z.xterms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass r 6p3 9q8x a f1,u9(bqbsvo0fdqxnd,oof a number of rubber stoppers and their resulting weight on some far-off planet. The slope of tdpo,b a 981x9,qxo(qrquv sfn 06fbd3 he graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest9 w ajrsy)ho/ f8pu2l, on a table. The magnitude ofjy/2r8aswuhl) p o9f, the gravitational 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 fro9v*. .vfzt5o,sl nb rl x.uem7m a classroom ceiling by a series of strings as shown in the figure. Which string has the greateltsf9xvvru.*..,o z5 b7nm le st tension?

  16.05: In the figure shown, the mass m = 6.0 k.np0 h re.im q/q;x,bu。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the ten;re nqhm.q,0x /bip .usion in the string connecting the masses?

  14.13: Which one of the following )8 k*)v(ad: ytixxrqeetm0o1scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force thak(iqeyo :av dr)et8m)x10*xt t is proportional to the displacement.”?

  94.26: As shown in the acc6sjig+, 0. 4crhu.(e qipkn(np8 fhg pompanying figure, a force F is exerted at an angle of jcr.,g(p+0nq khsihi (pn 4pe8.ufg6$\theta$. 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 r hylo4)04 nbglm9 o-vcough horizontal floor at constant speed by means of a force P as shown to the right. Which o nlv40 hb-o)cm lyo9g4f the following must be true?

  99.08: A weight can be hung in any of the following four ways. In whixtz6spt rt* ;)sxsl4 *ch case is the x*rl4 s*;tssxptt) 6zstring most likely to break?

  96.39: Assume the objects in the following diagrams havey7b/+ni-c n xv equal mass and the strings holdi7 nn +/i-cyvxbng them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes couu91o)y k(mto accelerate 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 mag(k9ycuo)u o m1nitude 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 of time, the ma-rxug 6fy3;yc ss has position 2.0 m, velocity 3.0 m/s,ufx; y y63cg-rand 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 oeep+*2wkk ru)n a rough surface by a horizontal force of 15 N as shown, during the push, upwkk+r) ee 2* 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 shox.azve d9er4g-yia,j b*s71 8)zsvbiwn in the figure to the right is sliding to the right alonbi*g, 8-9b1)axj ezyd iesvav z4.rs7g 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 dgler rgq quj83 )ig12mx73,won 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 plat wy f57md/-wiv jlfq9v+i4cbw7j+ft8 e as shown in the diagrbwcw-w +fy fd9 /ljj5q7+m48v f7 viitam 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 θc4;-wsl+86* (as yqbwmbdh8 .dodjko with the horizontal. The block remains at rest as θ o (8sjlbk-mhd .swb qd6 *yoa +4wd;8c 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 inclined at an angle *5*zh1kw gphbof $30^{\circ}$ 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 plan pw)izqem+q :,e (where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force ofei:q q,pw)+mz friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational forcijei/5n34r)ng8pgm 8c e3b9i g7v h yze of magnitude N 10 acting on it from the Earth. Which of the follhn7ne8jp m/i r9evci3)4zyg8gb 53igowing 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 surface.

  15.13: An object is beingi*n48 kb i 9 py:dqaxu/ kmex)n6zxw32 pushed 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 co x/bw 4 xi:ui9n)aked m3z6x2npy*8qkrrect relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a cjtb)fmjs0s78u h6 +snvg x s++onstant speed of 5.0 m/s straight up a flat surface inclined+7+bjf+ 86 )v0 msgusxsntjhs $30^{\circ}$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 . W6rj m 9ie8-g.j:k9amyj.54egohxd as 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 friction b98.sydx ji j 9ream6g:kh45-o gajme .etween 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 releas shug.+pes 44ted from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table ss g e4u.p4th+as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?