07.10: Contact forceshi*q ;u i :ghriz99b;b are examples of which of the fundamental forces?

  99.02: Which of the following terms is j(m( zi:koxjn84b(bah mdi .)NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a numb z/ , mbofw3zqk99wyi2er of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representationwoyk9, b2 mqz3iz f/w9 of the:

  10.15: Three blocks, labeled A,B, and C,yht-o:xc(xld /rtv,cy f6(r/ remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of ctyt((,voh -rf:x l c6d/ /xyrthe contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroo g/r gx;xh8m.fm ceiling by a series of strings as shown in the figure. Which string has the great xhr.f/8mgxg ;est tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 h*ae +j h(dh)nk。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in jhenhadh (* )+the string connecting the masses?

  14.13: Which one of the following scientists is most associated with the fom4rm)h,xbgi )obl1r2n7ig 9mllowing statement: “For small displacements of an object from equilibrium, there is a restoring force that is mxnb,rg)im m7og4br)2 i9h 1lproportional to the displacement.”?

  94.26: As shown in the acconnrrr7,5 -3z,nlfx;j(r lc hl;sp5aampanying figure, a force F is exerted at an angle of l7 a arrcplzn;;rlnj5f5r xn,-,h s(3$\theta$. 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 w.i3y;st p9 axlooden box along a rough horizontal floor at constant speesyxap9i.l3 ; td 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 t4f 5d3z nwhn/ihe following four ways. In which case is the string mo hnw4d53n/fizst likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and the stbc (oot.olld3b ly5f1y:rhos6j(: /vrings holding them in place are identical. In which case would the stro.( f b6(3:lt vo yol jb5y/dsh1r:olcing be most likely to break?

  16.10: A person wishes to ace4v6eo;lc+0dbu s4 gp celerate 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 magnuec4d6s g;l +ev b4p0oitude 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 instant of time, the qdpr5ko +.c1 cmass has position 2.0 m, velocity 3.0 m/s,a+k. qrc c1dp5ond 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 by afmn(4.zxt r. gnnp 4pus(tsq0/h q)5g horizontal force of fnq/npsus4tt 0 n4gx(.m5. z)( pgqhr15 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 right iwq+oqhxu+6f*0 - 2jc dlwym/ls sliding to the right along the floor. A horizontal force of 10.0 N is being apxoju6+wy0 /dh wlf-* l+qqcm2plied 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 at ;uxvh6bpe:( yr- ,t mnan 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 h+ mz*.t/u5umjcz bz .qxo*c0aorizontal steel plate as shown in the diagrm q0zm+/.c*zbu5t xj.oc*zuaam 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 oloy),46jr 0p gnd;otun an incline 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 the s n6,)joyp4;drtugl0 otatic frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane incli/ m+tbp/ tkqyn:n/ vp-ned 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 t49; ). rlpiaw lskfym q7ha-qh) +h-isignificant) in inclined at the same angle, it will ya wh9ihk qi-s-)al)4qp7flr h;+mt.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 magnitude N 1*xne um 6gvgkj/9ek.ybv2n 9 xp.i )i-0 acting on it from the Earth. Which of the following gives the correct components of this 6g uv2i*-9 .gx/ekxmnbpjk.9)vyie n 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 an inclined plane.l95 jqhzcip od19lg 4( 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 followi4cp (1l9 lgjqho9i d5zng choices represents correct relationships between

  08.20: A person pushes a block of masse1jl 3ei6a ,n2+ kmi 3phb,rnw M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface incli1bpnhle + m3kri ,a2wj 3e,n6ined $30^{\circ}$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 angls4qz:x wv ;+g33jmrxp95r i fse 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 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 t;q: xzsji 3rvgm49+3wsr5xpfhe mass,m, of the block?

  17.40: A small object of mass M is released from rest at t (j grh us.l:m)pds.2hhe top 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 of the normal force from the table on.)dsl. (hhru jmg2sp : the incline?