07.10: Contact forces are examyivnu q ykp(..8v +ncw: pr4t(ns4uc4ples of which of the fundamental forces?

  99.02: Which of the fs8 esb.o68pn* -ho mwg-yxr u- 8ua*wcollowing terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mas zxs b5o5yqh*(:9 mib8:tk b)i2 wzpows of a number of rubber stoppers and their resulting weight on some far-off planet. :wwbzi9o(iz5*2b8y :ho5s pqbtx m k)The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain vfiz l-3tn ly2b.1. acat rest on a table. The magnitude of the gravitational force on each blockb c. vln3ali.2tf-zy1 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 hufky- 2f.o*l+nm.xfceiling by a series of strings as shown in the figure.ym.h+- kolf2 *n.ffux Which string has the greatest tension?

  16.05: In the figure showr0y2iq: erj-vn, the mass 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 connec : 0q-viyerj2rting the masses?

  14.13: Which one of theg8a* r y53kwyh n f2 fuyr/8ogq.-qka1 following scientists is most associated with the following statement: “For2k*3y8 y gf.ogr1nqk 8 /w 5hf-auayqr small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exew *ia)s;xz(w irted at an angle of z;ixww(s)i a* $\theta$. 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 floomn8/+zgaztur32b8 ez,; sxr k r at constant speed by means of a force P s8z;8tkzr z/uba3+mn,rxge2as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four wa-:tmrswg 6er 0ys. In which case is the string most likelm6 g :rw0tre-sy to break?

  96.39: Assume the objects in the following diagrv0+zl*w5o+u xht :aymams have equal mass and the strings holding thv: 5wlt0*a+m+ houzxy em in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes ac)tf2eh pfp sup(p-l25(t3 jto accelerate an object upward uniformly. Which one of the followin-)p 2utlf(a tj3psp2 he5(cpfg choices must 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-axis/9zbag vwyc,35h0kec, at one instant of time, the mass has positioza ghb /c50yw9evc, 3kn 2.0 m, velocity 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 right on hkpxe-+5 lxo, a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates, x5+e-kpxohl 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 show8d :leo(bar t1n in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of ko1et(d lbr:8 ainetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inclin4t gm:dbi0o y-wik l.3ed 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 firs *dyj--gzate,0q2r ust pulled across a horizontal steel plate as shown in th -te0s 2-jq*gu ardy,ze diagram 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 wit:d-9u*zz oll 3duti 5ih the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal 5 t dizu9dllz3u:-oi* force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on aax7b np (teld/v5t-m(w5j :ex-tkpm 0 flat 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 placed6o 1w8 av 9f xpxze3uu3cy/v2m on a second 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 tmy xp8w v23c1z xv3/uu6 eof9ahe block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force o;1/hu/pdlwyc c1e zy y87x(b ef magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coorce 8e7(bx//hyzypwyu11l ;d c dinate 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 being pushed at constant speed onw52 j k3 kgr)p4qret:g 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 represew:tp 3g24)qg rj e5kkrnts correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant o2z;: a hfrg;kspeed of 5.0 m/s straight up a ;k 2ro;:ahfzgflat 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 misplace28btqk) vt10sz6pvs/ps l6z ud 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 static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the block and inclined plane is 0.12606u pspqt b/tzs vskzv)l892. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of massjt(tz9- 8m--ti tqti9ja6zig M is released 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 ima- t--96 g(itq8tzt zjij9t reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?