07.10: Contact forces are examples of which of the fundamental forc9u.cua nr*s:yes?

  99.02: Which of the following terms is NOT relahdmc:(8h+2k jzf6ic i 9etc l:ted conceptually to the others?

  02.20: The graph shows7o.4 xwx w23saqe, w-*demoj)x xpi:m the relationship between the mass of a number of rubber stoppers and their e 3 me)-7mw4*w ,idoqxojsx 2xpa.:x wresulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,bl7qsnghu-4 t -s(f t3B, and C, remain at rest on a table. The magnitude of the gravitational force on each b4l-u sgfthqns -7(3t 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 a series of ik;oz* 4qh,ribt x.1dstrings as shown in the figure. Which strindohiqtkxb z4 i*,1 ;.rg has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k r)kvhrd97; nk。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension id kv)k97rhr ;nn the string connecting the masses?

  14.13: Which one of the following scientists is most y*.sb1 cm+qfh associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring forcemcbh.1yqf +*s that is proportional to the displacement.”?

  94.26: As shown in the accompanyinw9)wb v (jq:zt8g okz-hqn n;+g figure, a force F is exerted at an angle of q9 gvzo+:n k8n-w(z)tq ;b whj$\theta$. 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 floor at e fi e4wafm.mn2v*/q 5constant speed by means of a force P as shown to the eq*.fi 5wa4mmfn 2e/v right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In which comh;9/ is;:3xatrg gpase is the string most likely t3g:;sh oig/ap9 mr tx;o break?

  96.39: Assume the objects in the following diagrams hav0b+mk4x4e no re equal mass and the strings holding them in place are identical. In which cas4o40 kx+ mnbree would the string be most likely to break?

  16.10: A person wishes ts0) +to5xzjkv so22qf o accelerate an object upward uniformly. Which one of the following choices must be true of the force Fq 2oxz+s of) jk052vst, 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 of ti1 lj)q+mgbx:66h/ g cb- kyjv09n fcgkme, the mass has position 2.0 m, veloc 6) x6nbggjcmbf kc+j9vq/:0yh k1-lgity 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 objectp zpmbkd(siw c /c2p.ti:4xbz. o .4:g is pushed to the right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the rig.4:4m/zc.pgk bp. ito pzids(w:2c xbht 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 n/okw4.b )gopk/nk 7s to the right is sliding to the right along the floor. A horizo k)osp.//n7nbk4okg wntal 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 incli - ya6ipi 6 **oy)q) nnxam)w/r43fgeml,xbbwned 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 acrovhs;p2z1 l8g ivw bkc+j-u1ufat; :x 3ss a horizontal steel plate as shown in 2ius+;u -8wx 1gp vvjchb:t1fzk3;lathe 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 me.;7t* wnjmvs;4 tpj eakes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the ntej4; vs*;n .etmwp7 jormal 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 aj srx9,it5 y)cngle 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 friction is signifd1 dtys kn-/lu m9ch+.3ig 6biz 8)hlticant) in inclined at the same angle, i it/9ld6hn ) 3kidu+.g 8b- htc1mzylst will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational fq,;;vbsmgqwut rhnj6 n g,r-/ao5 r7;orce of magnitude N 10 acting on it from the Earth. Which of the followingnm; ;t7ru /q svr,w n-qg,borh5a6;jg 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 beinaj /jpsbgznfue//2- 6bl22g vg 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 inclinjsbz-2ugvegna6 p2b/ f2 jl/ /e by F, and the normal force with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg z o73 7paa00 kr6vujyqwith a constant speed of 5.0 m/s straight up a flayau7oprvqj073ak60z t 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 angyk foo: b3m6j8le θ . When released, the blo6 y8fo: 3okbjmck 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 0.92. 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 the .rpj2tg aub nc ,ntnx+7qy+). 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 objectj2.bngx,.tnap)+uc nqtry7 + slides. During the slide, what is the magnitude of the normal force from the table on the incline?