07.10: Contact forces are examples mr*m5;l )p bbcof which of the fundamental forces?

  99.02: Which of the following t.j+e(z8.yh )c bxeqjterms is NOT related conceptually to the others?

  02.20: The graph shows the relatio)lev(y e1cclzudey 3i;; .:cs nship 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 o yes3 leizl:ccc.)dv; (y;1e uf the:

  10.15: Three blocks, labkp378 t:i eozweled A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicte:3wz7k o8pi ated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended fb7qabrft7a; 6rom a classroom ceiling by a series of strings as shown in the figure. Which string has the greatest te7brb atafq67 ;nsion?

  16.05: In the figure k5pq)krfg y++go )hf8shown, the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the flo fk+r ) g5qgk)p8fyh+oor. 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 lrf/4 7r sjl5ugh0xq ,associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is usfjl5rqgl h/x70 4r, proportional to the displacement.”?

  94.26: As shown in the accompanyinqu ij7j*wvkq ( r so:n)/,zy-ag figure, a force F is exerted at an angle of q:ni (azjy*w)7qsvok j ,- u/r$\theta$. 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 horizontal f8c m:l;(8;fja0 q6hlk vg+ vwk+fwtgw loor at constant speed by means of a force P as mwkktaj68 ;cg:(w+w vg; 8vfqf0+ llhshown to the right. Which of the following must be true?

  99.08: A weight can be hung in an()djm46roe r ky of the following four ways. In which case is theo4dm6j(r r) ke string most likely to break?

  96.39: Assume the obb+wbezsy )ed26 /uqb d nn99e0jects in the following diagrams have equal mass and the strings holding them in place are identical. In which case would the string )0+de26sb zweb n/q9dney9bu be most likely to break?

  16.10: A person wishes to accelerate an objecyy h ,w k lap2gjjglf/y))/+u5t upward uniformly. Which one of the following choices must be true of the force F, provided by the persy ghk)a ypl /y,5gu/j2l)j w+fon 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’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instant of time, thzd.k ,a0rm -qyz o,;pt i2+ckne mass has position 2.0 m, im,zkna 2+zq.oryc0t -p k;d ,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 surjg( v;a1lpkx/face by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right a1;l/gjk x( vpat 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 bonz((mr9b)up ox shown in the figure 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 coefficient of kinetic friction between the box and the floor is 0.20. The box is mom(()9pnzbour ving with:

  00.32: A block rests on a flat plane inclined at an an5q wa7 1( n06fyuxkhwcgle 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 horizontal steel plate akd5 1q6 yfrwa5nm3i76n dn1e ts shown in the diagram A. d51qr6tk3m a76wd iyn1en5nf
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 makesyn n u*n9pv8rqlbt650 t48hsu the angle θ with the horizontal. The block remains at rest as θ is slowly inn9lrt 08utv 4u n*bqy6ph5 sn8creased. The magnitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block resg-p)z k ajq ubr53r 5g3ddg0ba+ 4u3lfts on a flat plane inclined 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 plj0eue imu)8,0 h:ozylo xt+ p4aced on a second plane (where friction is significant) in inclined at the same angle, it will begin to acceleratz8jpmoi0u) 0+:4eeh t ox,lyue 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 incf f :,x+0bioixlined plane has a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational forfoix+x f, 0:ibce 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 0mz,sfnh)3j; - 2l- nepksskc 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 thes0lnekf;) 3jc-s kznhm,-s 2p 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 c zfin yge:i+nrs22o +(onstant speed of 5.0 m/s straight up a flat f n+y2si(ng e+r:z2 oisurface 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 mispl w40yy;o ynconu-spv 02xxv(;,v8g f /upp/coaced on an inclined plane of angle θ . When released, the block x0puy84uo-o,;/nypfv p w (;0gncxc /syv2ov 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 ther*5 dlbutu *quu 4be2)/unq+ m top of a frictionless incl+qubu *utd)25ql 4r* eub u/mnine. 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 the incline?