07.10: Contact forces are examplhn*:xyjtki y v82l 0x( yon cn5o8mo(4es of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to tz-.e :o3 87hvl 6y otv5f-gdnrr-aogihe others?

  02.20: The graph shows the6qlz k(cj)y 5xt7.m *cem,b+x uhau8s relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. Thb(la hus.)jk5x ,z8mqxec*y 6m7utc+e slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a tab 7 2pcey+0gnqrt2vvx/le. The magnitude of the gravitational force on each block is indicated o0t2cv7v2 +nqxrpey/ gn the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a series o1,siebxv9nh -f strings as shown in 91 b, xi-ehvnsthe figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and u8-b8d8 blypp;lh .zgms a5g9 the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the8.u;bp5l9hb l88gsym- dagp z masses?

  14.13: Which one of the follod.5 kod e ve*d u6njri2l-cw69wing scientists is most associated with the following statement: “Fodui6.n5dlce *- rj koe9wv 62dr small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in thecj*2d sofo1evbojz+27x4ff z1 5njf8 kaj-+ p accompanying figure, a force F is exerted at an angle of 5+d+ j -8jc 1f2os42vjo1bz* xzn7e f pjfafok$\theta$. 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 wo;:rt50 c1 aksk)s otrioden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of tk rc) sk:r5tso1;ait0 he following must be true?

  99.08: A weight can be hung in any of the following four ways. ni ,me.-t0 u7 boqaoa) In which case is tn70.aoq,mei auto- )bhe string most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and thx 0ahcs34.ly,ho uwn;e strings holding them in place are identical. In which case would the string be mos3l,h;.onu4cx s wh y0at likely to break?

  16.10: A person wishes to 9gwqx xbgaa)6 k:* +-eei6myuaccelerate 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 +e6-eg a 96wi*qk:uyxmbx)ag 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:x ns( ) nt;pif9avppil+8y;d nt of time, the mass has position8y)np;;pti :s9d+flix (anp v 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 push a )55hefmk.y i d82sjb-oe4jhed to the right on a rough surface by a horizontal forceheb-4yms.52d ikoj8hf j)ae 5 of 15 N as shown, 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 figure to the rb8w3yc7 vdjkw,k x+: xight is sliding to the right along the floor. A horizontal force ox83ckjy,7bwv wd xk+: f 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 inclined ah,(u 0pmhb 3zgt 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 horizov9(sw/l;wk k6lc qc n:ntal steel plate as shown in thw (w 9nq :sl/vk6clck;e diagram 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 incline that makes the angle θ wit ah+d/,jnr +2i mfys(j6(ebv hh the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the stati j/nraie+b+2hfv( ( mhj s,yd6c frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane incrc5 lnr:4gbs8 lined 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 is placed on a second plane (where friction is m cm)gq+o 0(um.tz(g 4z7x ;liqk/jqksignificant) in inclin( 7qmg(x)/l0kc +q;j. k qtmzmugi4oz ed 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 second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of mf1 t.ii)d -tqu6qxs7ry2y2 k kagnitude N 10 acting on it from the Earth. Which of the following gives the correc2y ) qs7qux1. -idtrf 2kyt6ikt 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 conshenic+2c gwox7j q 319tant speed on an inclined plane. The free body 1cen3 qg9o2c+ iw7jhxdiagram 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 kg with a constant speed n.75lt amnt 4xof 5.0 m/s straight up a flamnl5a7 tt.x4n t 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 angg h-h xd3;zn3dle θ . When released, the blocn 3d-d3;hghzxk 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 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 frictio:x,ly.ta8/r npz:uy cnless incline. The inclinehas a mass M and makes an angle θ with the horizontal. Thl . puyax /ryn:8,tcz:e incline remains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?