07.10: Contact forces are examples of whio* )v6nav /qftld67dz ch of the fundamental forces?

  99.02: Which of the followi+s3yew 5c;pqg y k1kd(ng terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber rjtj):l xo;qye+t bo9snu) - qcw /3,gstop)- e b;yojnur)s,jqcx9t :3wog+ tl/qpers and 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, and C, remain at rest on a table. The magniqh.( a0gg7ohu 5ix8 sm+c(bpxkkh+3o tude of the gravitational force on each block is indicated on the figure. Wha kqx.k7ubgis o3 g0ohxh8mp+c+5h (a( t is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are 40lwdlb:zm)ho1sp+5afij+1 o w:n io suspended from a classroom ceiling by a series of strings as shown in the figurewhaoi10il dsjnw+opo:4zf 5 ) :+lm 1b. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0uelc1u uvofx 0c)+,t ug(e5m;v2djx , k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the )2 g uolet+ uvf5c, vxd(j0uc;xu1me,tension in the string connecting the masses?

  14.13: Which one of the following scientists is most as*qmdt:t-;p ixy9sqc/ sociated with the following statement: “For small displacements o qcsmix :t/p;*qyd-t9 f an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure,n, ; y*yxw/+/3t tshseub,zl j a force F is exerted at an angle of j/, +w,tye x;/3u lyss*bn htz$\theta$. 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 woodencgwd p)r9dfeh.2 kf 0ub 9l68 u2*x4lzflyh x: box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following muyb*h:2lhdfc luu9p8.w 0xfe) xk 2f6zr lgd49st be true?

  99.08: A weight can be hung in any of the following four ways. In whicoho6elrz;)lc z:0 9 ehh case is t9lze) rho0h coe6l;z:he string most likely to break?

  96.39: Assume the objects in the fg9 is-krmu n (vehlrt(;,c)(n ollowing diagrams have equal mass and the strings holding them in place are identical. In which case would t(v,)sgu;rhen(c -i ( tm9kln rhe string be most likely to break?

  16.10: A person wishes to acceler* p,vdv aohi8(ate an object upward uniformly. Which one of the following choices musta*pd(8o, hivv 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’srotation.

  11.12: A 5.0 kg mass moves alievk* o40 ummdgj/+y0ong the x-axis, at one instant of time, the mass has position 2.0 m, velocitkv0 0+mjouyi4 dg*/ mey 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 tdeuvyz1 c;8/6gw6c ayhe right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to ud1 6zy/;g wa6 8ecvcythe 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 t/kxb)u81 obq ohe 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 kinetic friction between the box and the floor is 0.20. The box is m8/1k boo)xb quoving with:

  00.32: A block rests on a flat plane inclined at an.vq0ex:j4dmz lb rqa4 +iqt8- 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 horizontugs w-z3;de5i,0kyor- z qpp ,al steel plate as shown in the dip-;wgiy-,,3upk o5 zsredzq 0agram 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 inq+q7 :jm:i(+twvehhycak 1(t cline 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 th1 chtyqj a:( v+mh7t:q+ei( kwe static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inclined at an angle of tyhpz aptjt 8p*;i/,3 $30^{\circ}$ 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 pla gn qfnesj9:/r/r,dl9- i4hftne (where friction is significant) in inclined at lds, 9fr/g4nifrn q 9e: h/jt-the same angle, 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 gravitationakr+ (0nprtsz0h b;7aa l force of magnitude N 10 acting on it from the Earth. Which of thz 0+7sar0knpba;r h t(e 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 surface.

  15.13: An object is being pushed at constant speed on s:8oe4.hq lo:4zwupo an inclined plane. The free body diagram of the object s4uq 4 oo8o:ewp:lh.zis 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 kg with a constant speed of 5.ad a:n.gjt21 s0 m/s straight up a flat surface inclineg dnas2 :tja1.d $30^{\circ}$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 misplac*btsu s1jec. 6ed 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 62 N wt.*seus6 jcb 1hile 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 ,t v5f.qz*a 8emds0k+hdj /stnrui *2j0ow7 ufrictionless 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, what is the magn7m uj+hvr t sqk0d5* ,/uj*t0nzf2woas.d ei8itude of the normal force from the table on the incline?