07.10: Contact forces are ex mc0b wp9x.pf yj6.xb)jbxq vw9- -,viamples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to( .g0 -3g*msrjy2lu bpl+lae *5gt xnm the others?

  02.20: The graph shows the relationship between the mass of a number oksu hze1 r5(4,(qdio.yy cf3sf rubber stoppers and their resulting weight on some(4s ,sfu5yyd io qke .hcz(31r far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,Bu:wom5df; k ka,5vv-x , and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact 5f v; x k:wda-uomvk5,force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling br, r0(3ak(bmyuv;hxo y a series of strings as shown(mv3( by au;rk,oh0rx in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。andmj-z ap2t94fb the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices representstab-m jzf4p2 9 the tension in the string connecting the masses?

  14.13: Which one of the following scientists is mo0g0ss 4 bikdbp:, x2swst associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is pro,20gpi4 s0dxk :bbs swportional to the displacement.”?

  94.26: As shown in the accompanying figufllqdm: ;uflrke+ c( ;p2pkek-6 8p0lre, a force F is exerted at an angle of 86dpk2 ukf- mlp(:0lr+kqfpecl; l;e$\theta$. 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(6e)nu ecqfz6hk: n/b at constant speed by means of a force P as sho(fc/6:unz hkq ) 6enbewn to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In vtom :f2ju.kcc;8 b 0ewhich case is the string most likely to break?j: u2c0k o8;cvmb.etf

  96.39: Assume the objects in the following diagrams have equal masi2gsn0/g/0at (im vdoot ;oa/ s and the strings holding them in placso/a gidt/n/gmo0 ;t io2(0av e are identical. In which case would the string be most likely to break?

  16.10: A person wishes torsg j,c ,ph3 x(1hp+hs 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 magnitude of the gravitational force acting on the object. Ignore any effects of the,rxp3jhs s1,(g hhc+p air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instantkn4qkik k9nne 6tzth7.2 9qd ( of time, the mass has positionk.9q7tknn e 62hk dztiq9 nk4( 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 thebfs9dgj 92 aru3 xa55t right on a rough surface by a horizontal force of 15 N as sho x9rj s5gdt af2ub3a95wn, 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 fi(szhq-rv;8 y fgure 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 kin-vr zy(shq8; fetic 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 /ya.c3 g1q /ijjc nh6kangle 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 plate as shown in2;. bm g6/if-zmzkddx the diagkbz x fd6m zm./;idg-2ram 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 am 0rprf-k:y g;dv2i gm-ph5/jn incline 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 incline o5p mg y:rig20hjmvp-rd;- f k/n the block

  01.11: A 5 kg block rests on a flat plane inclined at an angle , : r-q5qxesmg)b +6-gb zpju yv/pwp3of $30^{\circ}$ 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 ivu:yg91 g2wi 2 pkr eqq4)sr1gs placed 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 the block and the second2usg ):q 1y9vrrwki4g e2g1qp inclined plane?

  08.08: An object on an inclined g ,fdu*f:njo)lzk.8 v-(wj x6x rc*d zplane has a gravitational force 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 - fxndk :*x rwfz)(*zv8j.6cld,oguj 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 on an inclined plane. The frkucfxvmo75qusz f e24zl0f62w fdb*1 1fg8n -ee body diagram of the object is shown with the gravitational force represented by W, the friction force by f, theon4wk5zu*v8 xbz0m s1 u7c1g22f6 lqfffd ef- 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 relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constalrepvp3y-p5x-t v o 71nt speed of 5.0 m/s s3lp7t vpp1ryov-e5x- traight up a flat 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 θ . Wh5 kcpa/xs( :/nam/bvx yqzd97en 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 0.92. Which one of the following choicbqmd95ac yp x:kn7 /x/s v/z(aes best represents the mass,m, of the block?

  17.40: A small object of l j5 yb h7-re*cdtwjq;/s3fl2mass 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 reston a table as thesmall object slides. During the slide, whq7/elj slr53c2 ytjf h*b;-dwat is the magnitude of the normal force from the table on the incline?