07.10: Contact forces are examples of whg n,ji t+zps;1ich of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the zf 065d ihp) ve1gomg3others?

  02.20: The graph shows the relationship bephj* jz6u ky8 ejs5*3itween the mass of a number of rubber stoppers and their resulting weuzj58 s*6j j*kepiy3 hight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, lab0tbr1 r,cae a3 n/)/ lk2odrsteled A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated /) 2rno3r,bs 0 d/rlktcat ea1on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal maea-e k.cpvdiz2.zv oxy8s( +438zyfvsses are suspended from a classroom ceiling by a series of strings as shown in the i.ay3zzvzc+- v8p4exf .e8dyv ok (2sfigure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。uej- n+yf5m 7e;a kq i1aj-s7cand the mass M = 14.0 k。are stationarys;qejj-nu +1kfac75em7 y i a-. The mass M rests 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 wfjwgcr.z65 . associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the w 6 .zg5wc.frjdisplacement.”?

  94.26: As shown in the accompanyin,.5i6jc3+h ylgactx(ofs jw 3g figure, a force F is exerted at an angle of 6( 3st5afj3hylcw xoc . jig+,$\theta$. 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 bo6. cr05tt ukb5en s.dox along a rough horizontal floor at constant spebske6ou 5dt.n 0r5c.ted by means of a force P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four jb+/1v+eckkj sn3dj o gp64 c3ways. In which case is the string most lik 1k34k 6 p+ e3+no/djjbvgscjcely to break?

  96.39: Assume the objects in the following diagrams have equal mas11:or vzq*yq/bn5be ws and the strings holding them in place are ident 1z:e5vr/yb1*o qwq nbical. In which case would the string be most likely to break?

  16.10: A person wishes to accelege ,o6e/(z1y8jkyyr erate an object upward uniformly. Which one of the following choices must ey z,/eyy(e g6 1jo8krbe 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’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one insta.yjw 1o j;gm n3++g/e-avkffs nt of time, the mass has position 2.0 m, velocity 3.0 m/s,and accf mf1g.aj3o;vg-+j/w +eknys eleration $4.0\;m/s^{2}$ . 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 su os+n613v oek8mx-lmkl;xto)t f1y2 w dq;9vyrface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right y x +vo3n6wt2 q dl)x-;yk9mles 1fvo1mo 8t;kat 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 slidingrf5:wp1lw. v k to the right along the floor. A horizontal force of 10.0. r1lkfpwv5:w 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 fla9i /7tfun u4kr4bccxk 8y r8v9t plane 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 steelp)ig3 9ctocry+ kk+b- plate as shown in the diagram Ar 3ygk+)o kb 9c+pit-c.
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 angleb(zs,u /9hx kf θ with the horizontal. The block remains at rest as θ is slowly i( u xsz,9kbf/hncreased. 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 inclin a az:j1pe3:n4 ex8hdmed 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 if-1glmf uh 0d+s 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 s0l-f gum+f1hd econd inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magnitude3fn2fnb7 t+ p,k1r,us ia3c cn N 10 acting on it from the Earth. Which of the follt3a2 nf+b 3 fn7,cu1,icpskr nowing 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 being pushed at constant spwemm 8 g ;wg5krm 2afaot2063zeed on an inclined plane. The free body di2;zgr m m0o2 tkaawf386 ew5gmagram 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 relationships between

  08.20: A person pushes a block of mass M=6.0 k 7n,ud rftk.3ug with a constant speed of 5.0 m/s straight up a flat surface inclined r duk 7.fnt,3u$30^{\circ}$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 misxr9v/xy; s f9ci(x(qc placed on an inclined plane of angle θ . When released, the block doecixxf / (yv;sqr(9x c9s 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 top of aaz1gm i9wmr7w6+k+nz+( q glk frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table akg+ ql1i+m knz7z6 g+wrw9(a ms thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?