07.10: Contact forces are exgwy4ejnwp k ( pg7)92samples of which of the fundamental forces?

  99.02: Which of the following termsf+*t3g ylo)vq is NOT related conceptually to the others?

  02.20: The graph shows the relat5ydn8q5jnl r 1jphz4e m4 4b1jionship between the mass of a number of rubber stopper 14npemjb4l85 1hrj45 qdynjzs 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 magnitu( 3shi0d8lpes n **butde of the gravitational force on each *nb03(u *hsi 8spdelt block 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 suspeh 40vd0xofi;ynded from a classroom ceiling by a series of strings as shown in the figure. Which string h d0 yx;of40vihas the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass 7 cak:j1er -ocM = 14.0 k。are statioj oc1c 7ea:k-rnary. 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 associate/ n-br:vn dn2fd with the following statement: “For small displacements ovnrf /nn2-:dbf an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted atu4qsgrhtv2-:q( 0 vp)m*ii ub an angle of *0 i-mspv4qu2(vutiq )g brh :$\theta$. 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 woodgfr(wvy; u-xy9*3vzt en box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which vyr;x3 t- g9zwv uy*(fof the following must be true?

  99.08: A weight can be ql8d6 , znq7aqrlfw7 2hung in any of the following four ways. In which case is th q w87z67dal,q2rqn fle string most likely to break?

  96.39: Assume the objects in the following diagrams havear g)kebp 5bkam9 3-fp/x/k9x equal mass and the strings holding them in place are identical. In which case would the string be mosx bk9apea95 /pkgm 3 /f)-brkxt likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one of 5ib+x9 tln gx*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 any effects of the air or of the Earth 5lxx9 nbi+g*t’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one insaz914 0kltune 5if6qw tant of time, the mass has position 2.0 m, velocity 3.0 m/s,and acceleration qena 64wt05uiz 1f9kl$4.0\;m/s^{2}$ . 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 onhoahgo1jx6; ri o)4m e s/ ,io,ch.mo, a rough surface by a horizontal force of 15 N as shown, during the push, the obje, r) ,a,;mceoohioogh6h1jmi/ 4.xso ct 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 figury 1 ylp6wl;*noe to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The;l n *w61yoypl coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests o62nsxw. 0o omt mr38bwn a flat 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 horibc 6e p qv/osjqm;+-u4.6ru horv)z 7izontal steel plate as shown in the diq +z) bh7or.voj cq;rsv6 6mp-u 4/iueagram 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 v h- lto2;3bmznc+)wjincline 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 static frictional force ofoj -z+3;m2 lcnbhtw) v the incline on the block

  01.11: A 5 kg block rests on a flat plane in12 yrwyncnqg(u6gg jje: (:e;clined 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 frictiokvqnj(7/gtbo m v* 1r7n is significant) in inclined at the same angle, it will begin to accelerat1 (jrg o7n7m vtkvb/*qe 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 gral7y71nu a2i1bfbu h/zo4v4h hvitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? Thb21 h4oyz/h 7bfuai lu41hv7ne 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;8uyi5 jf(o* ah s,qhq at constant 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 withof sai;y,j8hu*hqq5( the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of maso0 ag7k6/:9legegflgw h1-q ns M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclined 7g ewg fnhlo0al1ggq9e/6 k-: $30^{\circ}$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 incli 3i/twjju/+qw ned 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 while the force of static friction acting on the block has a magnitude of 38 N. The coefficient of statit+//u w qw3ijjc 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 trdb: /xsakxcr0+;fq 3 b :rh+of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal ;x f+s:/ rbkbhr3:a+cr0dxqt. 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 the incline?