07.10: Contact forces are px zq:2yh5;ue-e,pjm examples of which of the fundamental forces?

  99.02: Which of the following terms is NOT rednc7ro 9zt2 owkq)y47y16pyblated conceptually to the others?

  02.20: The graph shows the relationship betwee40ah + k:hw(ew tb,vgsn the mass of a number of rubber stopps ghtwebh0v+a4(k:,w ers 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 y.-oaxe pj ,e0jf*z*n table. The magnitude of the gravitational force on each b,eyf*0jjox z.-pe na*lock is indicated on 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 clabgtafb)i-s7( ssroom ceiling by a series of strings as shown in the figure. Which string has the greatf)btg (s-ai 7best tension?

  16.05: In the figure shown, the mass m = 6.0 kxdfzjmrn60 +y(+,aa k 。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the ryjx a(zm+kdfa0, 6+nfollowing choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated with the follow cn3nu c780hin 9bcm:oing statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the disp78 co: ucnc n309bnihmlacement.”?

  94.26: As shown in the accom c bvqnra+g. v*j:gjq9+ tsy44panying figure, a force F is exerted at an angle of vq9n j* s r44cqag.gvj y+t:+b$\theta$. 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 pullsm 8hw4fpm uj4*y7((ctcxcg - y a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following mjhm 7c-yx tugwf p4(4 8yc(*cmust be true?

  99.08: A weight can be hung in ,+h vn2z6 +zjqmv,q xvany of the following four ways. In which case is the string mz2nmx6zj q+ vv h,q,v+ost likely to break?

  96.39: Assume the objects in the following diagrams have equaa tocxl;2ol;az2v,, h l mass and the strings holding them in place are identical. In which case would the string be most likely to bl lxz ;,aotc2 ,hoa2;vreak?

  16.10: A person wishes to accelerat0k)jh 2exs+ dje 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. jkd) j0he+s2x 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 lw)4 lvl1:yn tinstant of time, the mass has positivn l4)lt w1ly:on 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 pushed to the right on a rough surface sci7.48f yna qby a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the righ8.n iacfyq4s7 t 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 tn --c9;y : gvgg7gikrowtm+g2he figure to the right is sliding to the right alro:-g9+i; -mggngtc2wgy7 kv ong 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 n+ou6vq sq;hye2 wy39n9or d+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 pe0 b/g;ccu5b9l8ju d first pulled across a horizontal steel plate as shown in the diag0bg8p/cdbj ulc5 ;u 9eram 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 incd /d,nwrpz,hqo .4k*gcurvu8q -1u g1line that makes the angle θ with the horizontal. The block remains at rest as θ is slowly inc rdgu o/wn-qgrz q4,u*cv1hk.d, pu8 1reased. 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 an anglen86 ;ptaa-ral5*:ik z -6mkttp pad9d 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 lut z6u 5wn8d6plane (where friction is significant) in inclined at the same angle, it l8zu dw 6u56ntwill 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 plan-mohh wv4s75v9ns /i az5 fmdilx52d+ e has a gravitational force of magnitude N 10 acting on it from the Earth. Which ofowf 9nvhhvim5a55 z 2 d4/i+sms-xdl7 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 surface.

  15.13: An object is being pushed at cowiwu 0ss,5, irz-xm8 unstant speed 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 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 relatiowsm,urz0iu5s x -,iw8 nships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant spej,uf. :l iac22bw3jaeed of 5.0 m/s straight up a flat surface incline jw3.cafi ea:jub22l,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 misplaced on an inclined plane of angvpp yr(70,wfiqqet -)le 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 fricfp(wvq0e q- ,yp7 ri)ttion 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 cp;1i ws; 6-d ,l8zlzai sr2hotop 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 thesmall object slides. During the slide, what is the magnitude ocz;8w6l,ao-r i1zsdlhp i;2 sf the normal force from the table on the incline?