07.10: Contact forces are examples of which of the fundamental forces?q v9hoh,muuu5:3)qv ci+zh1 a

  99.02: Which of the following terms is NOT related concepw8two89hn r2 gtually to the others?

  02.20: The graph shows the relationshi;lnnkq8mfbn/n;2.3zz nct (. (lxsih p between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation ob8z(sqft n ..; m(nl2nnhz lxknc3/i;f the:

  10.15: Three blocks, labeled cl1w61p8 ps jl.+wx: i;)wpjrowp2f rA,B, and C, remain at rest on a table. The magnitude of the gravitational fox2jsp;18fw.)p:r6 po +ljcw1 iw wprlrce on each 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 suspended frt3 8lvk+t rxx1om a classroom ceiling by a series of strings as shown in the figuv 8t1tl r+kx3xre. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and .bkv1j6 bimld)/fyu: 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 t. l6 kd )1/muifybvbj:he string connecting the masses?

  14.13: Which one of u(4um i+vm 6tmh+q2h hb-rfd3the following scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring fomuq( 3u hb+m6htvr m2-f+ih4drce that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angi,pl2 ieoety q+ea yam076u 92le of pl0 ii6t ,qeyma 2aee +7uy92o$\theta$. 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 wooden box along a rough horizontasj a ;1xck2)q3qkf lz4l floor at constant speed by means of a force P as shown to the x1kqkf)l qj4c sz a3;2right. Which of the following must be true?

  99.08: A weight can be hung in any of the r*,)dd,h :hfpvxpu20pyc qa4 following four ways. In which case is thex0h4)d pr2,y, q uvhdc:ap* pf string most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass uy -:3eqmab0pand the strings holding them in place are identical. In which case would the straqe3-m bup:y0 ing be most likely to break?

  16.10: A person wishes to accelerate an object u:uq .k leq2o/ /ycev:qpward 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 any effects of the air or of the Earth’sroq:k2l/y c oeuq:q /v.etation.

  11.12: A 5.0 kg mass moveh-b: wmm, xd3ss along the x-axis, at one instant of time, the mass has position 2.03 dws- bmxm:,h 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 u6:ev 47kt fwxpushed to the right on a rough surface by a horizontal force of 15 N as shown, during the 4x v6:tf 7kweupush, 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 rigb :er;hk(+,fchvth 7 tht is sliding to the right along the fl,(bk7hh tfvhr t:e;+coor. 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 plane inclined at an angle ;:sq /: nqxwuxof $30^{\circ}$ 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 horizontal steel plate as sho e(zt*woiy.u+e xbj v:7lr w:1wn in the diagram A. +:y .iulwt*v:eb ro7 j1zw(ex
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 incia-p 4v;0p gb5zqykd 7: q-nygline that makes the angle θ with the horizontal. The block remains at rest ay7g5;vz :ang -0qd i4 p-qbypks θ is slowly increased. 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 aa 55ye rtxv,b+e311cqgmoe.u ngle 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 f hrv30 kz:2 fts3v(fa xbt;i;yriction is significant) in inclined at the s2vh3frtk3bz 0ytf:x (vs;;ai ame 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 magn thchq25+ rxu .3urqn6itude N 10 acting on it from the Earth. Which of the following gives the correuhcq6qt2 n5x .rrh u+3ct 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 an inclined peaf);kz/3,wodgy duqt07d*pwne i97 lane. 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 c7 dq0w)eekgt3n f;d/7a9id*opuw,y z hoices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed of 5.0 m f7puqzq*s +b-:6.b2fttptxi7 bb y -v/s straig+x ubbyp7bqt-6 .qf2 v7ipz st:-fb*tht up a flat 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 angl)huoon t2f )* yf f-gd 3e,e0vfbo72boe 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 rfeohbff u2)-ngy2f d oe0v7)o3b*to, epresents the mass,m, of the block?

  17.40: A small object of masq/ -ku- mw6i-s7y-:wip qqjchs M is released from rest at the 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 sliy-m7w/k s hw-icqu6ip:-q- jqdes. During the slide, what is the magnitude of the normal force from the table on the incline?