07.10: Contact forces are examples of which of the )y,0pmm,3-0z ougo7m ycic bbfundamental forces?

  99.02: Which of the followinqo- ,3ykkmf-8ij m9 q)mhhnq 3uai/;mg terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a c- x2wwg nf5pi+ iyse,rl5 fo-.;e7ja number of rubber stoppers and their resulting weight on some far-off planet. The slope o.fw+7nfpjix;-5s layi 5 - ,2 gwocreef the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain cu/ vs*p5 qthri-6k5rat rest on a table. The magnitude of the gravitational force on each block uvi /qt-*6p r55rshck 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 suspendqxr5u6r ea6vycp 7u-wk( : 5kwed from a classroom ceiling by a series of strings as shown in the figure. Which string has 6pcer ayw6q(rw xuk7-k:v 55uthe greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the masm(h.8r odd7 :4qnysoos M = 14.0 k。are stationary. The mass M rests on thednoohso(mqyr 47d8:. floor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most an9,ux6lu 2 n9jvqx-bessociated with the following statement: “For small displacements of an object from equilibrium, thebx2u vl-n9 6nuq 9jx,ere is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F icmvdwcu0bj1x+ , 1wj1x9 c il2s exerted at an angle of c lc,+j1cxi1bjm v 1xwu2d09 w$\theta$. 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 fl/l5oyavgkrr0xc30 aq8 g8m o 1oor at constant speed by means of a force P as shown to the right. Which of cgya8/001rkq3g 5 ml a8 xorovthe following must be true?

  99.08: A weight can be hung in any of the folliv +0vwbhhxn 7 ci6o:;owing four ways. In which case is the string mostn0 b7 i;h vxco:iv6+wh likely to break?

  96.39: Assume the objects in the following diagramseu2 *rw r8cn4-lmca /w have equal mass and the strings holding them in place are identical. In which case would the string be most likely to b8 nlrcre -*/w mc4uw2areak?

  16.10: A person wishes to accelerate an object upward uniformly. Which o1xhaub5i5bp/ylqv; mwk:*d 5 ne of the following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitationk1ha5liq;5*u: pm vd/ xywb5 bal force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves alo5r8ial,ge 1n 05uiqcywq )lx7 ng the x-axis, at one instant of time, the mass has position 2.0 m, velocityrg i0lxq 751iq8)a uey5wn,cl 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 a rough surface by a horizont)oc y9apwqr,552cj-i fv35mz5 pgzzr al force of 15 N as shown, during the push, thzi5f-m 5z ,r2 5q5p)woyzpjacr g3 9vce 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 ke/k /(7oivotsliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kineo/koe/ (7ik vttic 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 of s gm- 08w+van h8bdk+s13b*,bcx ngjt$30^{\circ}$ 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 horizont9 k bwa2g cnn/bkg -2o(a-hqz+al steel plate as shown in the 9b 2hna g w -qkcno2a/+b-g(zkdiagram 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 vi 2axgmff)t :5u9j)d 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 incli)i j):t 2a5vxfmgdf 9une on the block

  01.11: A 5 kg block rests on a flat plane inclin6j(j ucsscxl()c (uy+ed 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 second plane (where friko6equ)h4fqky;5 eq8 ction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the fe;u qqk e h8oy64kq5f)orce of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational foracuh y-*i h0efs5; )cl3do* nrce 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 to the incline’s surface while the xoilr*fa*- h;5 3n)d ysecu0ch-axis is parallel to the inclined surface.

  15.13: An object is b5bwcp3ob,2zqhnb tp l/i7 e85 eing 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 correct relat tip7 cwp ,qe5 3/5bzhlo8bn2bionships between

  08.20: A person pushes a block o we:rj4yr pd:3,bdm/j 4kv f2of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flyf/:4bodwvp:4 j m 2,errd3kjat 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 θla67d(:1cjuvka w7t d . When released, the block does not move. It is det6lkt7a7 :dcujw1 v a(dermined 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 0.92. 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 thcoh i r 18,1lwxcf -jk1l/fkj3e 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. During the slide, w1rci jkoc1f8xwf ,l/- 3k1jlhhat is the magnitude of the normal force from the table on the incline?