07.10: Contact forces are examples of which of the .sn(wi*qcwyh w (/u 3q3i a2kvfundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the oxggp iodk ( xhi.pg(-:6(p9xt thers?

  02.20: The graph shows the rez0 y-l 87pwsnblationship between the mass of a number of rubber stoppers a7l8-psny wb z0nd their resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, x( x7 :6gydgvrand 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 ofxvg:( 76xyr dg the contact force on block C from block B?

  14.04: Three equal masses are suspit n vyea7vc-p6 d(7(e3db k-pended from a classroom ceiling by a series of strings as shown in the figure. Whib(v 3v-i(nytpc6d-7ek7 ed a pch string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M =tzdga86 nk* ou7ft +;p7v;xh g 14.0 k。are stationary. The mass M rk* +6ta8g7 gfu vpthdxn;;7 ozests on the 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 associatedo5wk4h,c3w 75h oloev with the following statement: “For small displacements ofvh5o 73owwo5ck4hle , an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accomp7i)dk qgpb 6td 2*d8pcanying figure, a force F is exerted at an angle of b)pdpi d682dqgck*7 t$\theta$. 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 roup8ctdt(jd gi ,afq0m/6ni 0b9gh horizontal floor at constant speed by means of a force P as shown to the righ,(0mjp/idtf8qcnb ia9 t6g0 dt. Which of the following must be true?

  99.08: A weight can be hung in any of the followdi+ eqotyzu)cv:0,4myj;) y t ing four ways. In which case is the string d zmiv4;juy yc+,)y0to)teq :most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and the/ la)e r/m1me4oj -ajopn*mi( strings holding them in m a)(l/ 1j-a j*eopnmomie/4 rplace are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate fgo4:zp. 6h v+ sjy(gwan object upward uniformly. Which one of the following choices must be true of the force F, provi 4p:swvof+ hy 6.gz(gjded 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 ofsgm06v-wuqvf+cdz; 3ko tuuyqffz) b1:.p 2) time, the mass has position 2.0 mv: q cfzm t.6)0 ukfyfs12 zu+-bqw; uvo3)dpg, 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 +fom8-dv 9,c ynizzk+ 9 0vfgo8t6vfqksy; 0a pushed to the right on a rough surface by a horizontal force of 15 N as shown, during the push, the objectvdkqmy8vz 8n vazk9+ s06fg,ff c+oi90yo;- t 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 sek5cwckl-2w9mbwvb u82 n 17 lliding to the right 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 -kme5w1b wl9 2lk8nvc 2b7wcuis moving with:

  00.32: A block rests on a flat plane inclined at an anguie pm)ti2 fc2do80; ule 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 i4xt- snpy c0n:le qx2)n the diagraepxylt0nqs x )-2c:4nm 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 incow1m+9 gv cnd+6huac2 line that makes the angle θ with the horizontal. The block remains at rest as θ is slowly incremg +acu n1whv o96+cd2ased. The magnitudes of the normal 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 atnp iizrx*8vg 8h-hp851gksc, f k90sn 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 friction is signifinulljj++nfc2i ; aqg7(4wjg -cant) in inclined at the same angle, it will begin to acc ngqj n+;+jj(2wgl74iu- lfac elerate 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 ps cw4hlmm 3(e10ywsl,vzu ;(jlane 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 the figure? The y-axis is pe10m mz jh ;wlc(e4lvys s3u(,wrpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant s7(lq2 vuv aih+peed 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 hqv(+uai27vl 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 bljwg38yo td;k; ock of mass M=6.0 kg with a constant speed of 5.0 m/s;d gywj k;ot38 straight 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 incli7 w0phv5yye 9dned 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 styyphv0de9 57watic 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 restj-c1 -4 rm i sam7(jnm eso5lq+2pl9ym 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 thj am (4-sc92 +mmljeip nq7ry1 os5-mlesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?