07.10: Contact forces are examples of which of t,nhwk6upt*e in 792kvhe fundamental forces?

  99.02: Which of the following terms is NOT related ct*v2vu .v-jve 7; kj ytkdgk3hd;(p/tonceptually to the others?

  02.20: The graph shows qf/u :p w84 7izvvtrw (zr3*rx9f .rbethe relationship between the mass of a number of rubber stoppers and their resulting weev (x./:qpzrbvr3rw4r 87z*9f iwftuight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and 7g b+.ckllh+h C, remain at rest on a table. The magnitude of the gravitational force on each block is indicatedglh c.bh+ lk7+ on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are s0c1usbs9m u-l(cr vz1 /z8,pgs2u znhuspended from a classroom ceiling by a series of string91 gusslp-bcuzcsh0z(z8 1m, uv r n2/s as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and zt i,kx; 9+,s8v7isudlk*gdk the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents tht*lixkk;d8s9 kz7 +d gi,su, ve tension in the string connecting the masses?

  14.13: Which one of the followiy 1 sbu)x06x3g kjk;bnng scientists is most associated with the following statement: “For small displacements of a)b6sk ug;13by n0jkxx n object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying f/fcwj r2n2hxpow( 2 6q/tjv jj9njh4) igure, a force F is exerted at an angle of chw4jhj j 2jn6fnt xp v29//(jo2 qw)r$\theta$. 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 horizo7w*tscq f 9um 2d ddklpb*.1p-ntal floor at constant speed by means of a force P as shown to the righ9fdk. 1s7pq2*d*mp clwubdt- t. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In which casejp5ox , 3elzir w24m/d2ch n;p is the string most lilzi2 p 2d4,enxh3j;rc5o /wm pkely to break?

  96.39: Assume the obje+xu k::znjh o/cts in the following diagrams have equal mass and the stringso:+/nx khjz:u holding them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one of set *k*n e7-co)l5vifthe follofinl* *o5evc)7 -t ksewing 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, at one instant ofbtcx*6* *an qj time, the mass has position 2.0 m, velocity 3.0 m/s,and* ncqb*x ta*6j 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(ivwzatc 0*q p(60ia c to the right on a rough surface by a horizontal fo(6p(0ac z ivi 0cwq*atrce of 15 N as 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 shown in the figure to the right is sliding to the ri640r ny0a gmguc4amo,ght along 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 mo0a4mungcmg ,6 a 4ry0oving with:

  00.32: A block rests on a flat plane inclvh n8.ksa oiuy)-n-1mined 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 w,h v(vy:cv6l first pulled across a horizontal steel plate as shown in the diagram Ahc vvy6lv: (w,.
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 iv/ 0 lz3bap +* *7yvnyca-rypincline that makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the inv0/* v*-lnap yzy7a ric+y p3bcline on the block

  01.11: A 5 kg block rests on a flat plane inclined at an 4ht*.e0dq -q4ht(ek9cjiiao+k (hm) gyl e6zangle 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 frict3z6i7-t g, wokd.ebhv ion 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 bloc v,.7gi-dkz6wh oebt3k and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magnituaqj7 5e,63j lhue8kahde 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 is8ja, u e ja6ql3eh7kh5 parallel to the inclined surface.

  15.13: An object is being pusheddf50cwqpp1c: 5.fybz oh7 j;w4 7ruc b 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 followinycu7 z:wfr0cp p75o5q w j b4cd;bfh.1g choices represents correct relationships between

  08.20: A person pushes a bloex 76qu28nkaw ck of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclinedak8xu7 qw6n e2 $30^{\circ}$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 inclinedwj4mg+m3rzj n z:2hc 4 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 w:4w 4+m3 jhnmrzgcj2 zhile 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 0.92. 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 restsu)8xw6qngve (13 h,2gs sdpb5xj t/z 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 as thesmall object slides. 21,ud zs/)8g sxp (bvxnqhs3gj5we6 tDuring the slide, what is the magnitude of the normal force from the table on the incline?