07.10: Contact forces are examples of which1*-rg c 3bzxbv of the fundamental forces?

  99.02: Which of the following terms i b2 /ri. aq)qv* :p8)cluztlrns NOT related conceptually to the others?

  02.20: The graph shows the relationship between th9si54. ,u8jzzc sb gtye mass of a number of rubber stoppers and their resulting wei tzgz94jb .,c85u yssight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at reg7-, x xtbb+pw9+ xgpjst on a table. The magnitude of the gravitational force on each block is indicated on the figure. Wh 7xg+wbpb9g, x tpjx+-at is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended fr fy*dlm82mpm *om a classroom ceiling by a series of strings as shown in the figure. Which string has the mml8md 2 yfp**greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass Mh 94m fqnwb/.t = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represe4qm t/hw9nb. fnts the tension in the string connecting the masses?

  14.13: Which one of the following scientists is mostm ofk xd0 heth3 u.h6mu.m3/s( associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force thatm (u.3osdh 3tmkuefh/m0x6 h. is proportional to the displacement.”?

  94.26: As shown in the azu y ejsj9ml*3)v 5mk/ccompanying figure, a force F is exerted at an angle of v/ zmk5j9uesmj3 )yl*$\theta$. 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 woodenyje pe g5dn-mu9n;1-k0l(q8xm,euz q4m 8fd t box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of uj; 5 8xne9 l( ym,mkqdpzqde41 gf--08nteumthe following must be true?

  99.08: A weight can be hung in any of the follo3 faqekm lq2 8opy6;kw4jn *j.wing four ways. In which case is the string k8 y36wk*;ejmon .p qfa42jqlmost likely to break?

  96.39: Assume the objects in the following diagr ;7bbqzi.eyx (ams have equal mass and the strings holding them in place are identical. In which case would b(.eiz;y7qb xthe string be most likely to break?

  16.10: A person wisheiatac s fgsr*/q88h/ x3w6(aus to 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 air or of the Earth’srotatio8a8 ws/ u6qifthsg3 / (c*xaarn.

  11.12: A 5.0 kg mass moves along gflfuu+ gyl o5m v96p8,jmo** the x-axis, at one instant of time, the mass has position 2.0 m, veloo , 8vg+jgu*lumfl yo*69mpf5city 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 surfat tll ,8j:6tc1f4kjue7gqj0 sce by a horizontal force of 15 N as shown, during thjg:,t71 ue0 slk84fltcj tj6qe 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 sliu,zv f frkosws84tx8 (n776lrw0(iq ui.z2pr ding to the right along li84pruwsnsqko rx8i z(tvz.ur27 76w(0,f f 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 moving with:

  00.32: A block rests on a flat plane bl26l/rndy0*s n hts(inclined 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 across a horizontal steel plat rm9r0 -jv+ pcsefi2;c j6xu0ge as shown in the diagram Aj0+c;6g0srumx iecf-r vj29 p.
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 ths)9( mfauawiq 9 jqf9t(o7dbx/- z m ;cpsz06ke angle θ with the horizontal. The block remains at rest as θ is slowly inw)bq(9sa(jx7 pfaftsm/dc9o ; k 9mq zzui-0 6creased. 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 amcwvr xcj --zy9,ux45t 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 sg dtts2 t18h*mecond plane (where friction is significant) in inclined at the same an8tt*dgm1 s2ht gle, it 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 force of magnitudev6. m,llw m6vs 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 is parallel to the inclined surfv6. mws mlv6l,ace.

  15.13: An object is being pushed at constant speed on an inclil-gow :bmtrbr o)5-2 gned 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 foll: b2 mg-ogrlrw5obt)-owing choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.p3*p;db pcyj:cr xew1;wk/ +e 0 kg with a constant speed of 5.0 m/s straigh j:;k3dep;re p1wp/ +cxcwy*b t 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 mfs a j1:kz3f q;je+cp4ass misplaced on an inclined 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 62p+:3jkfz cs fe1 ;j4qa 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 top of a fricn*l i:( ugd1 r(m,rwiationless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as thesrmila(wir(gn :1ud ,* mall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?