07.10: Contact forces are examples of which of the fundamental l*i+gde 6ios nta8sg0 l3r71uforces?

  99.02: Which of the followi ve7qa99k5,on )sj1 yy7xup vzng terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass ofgfa*7txp p* r)+ae ;vy a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the grapv 7aeptf yx*+ );r*pgah is a representation of the:

  10.15: Three blocks, labeled qok10 x(mzee6.b9slt A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indz lsb1k.tqem e(x69o0 icated 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 classroom c9 o;rp q75caame b94gixj.tj *eiling by a series of strings as shown in the figure. Which string has the greatesc i47t . e9 *ajaor;95qbxmgjpt tension?

  16.05: In the figure s1p078 hwuyu bshown, the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents p usyu7hbw018 the tension in the string connecting the masses?

  14.13: Which one of the following scientists,ax5uyyikvw c,ap0e+ dg6d aiv 88(l ) is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacemeia8g, l,6vi wk0y5u)ve ya cd 8ad+(xpnt.”?

  94.26: As shown in the accompanying figureilp (9:e cquo:psz/n9, a force F is exerted at an angle of q9p:(l/s p9cu: o znei$\theta$. 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 floor at conxcivh+.0qc 5 mlrt89 :z w-udostant speed by means of a force P as shown - q:tc.crolhzw+iv x580u9md to the right. Which of the following must be true?

  99.08: A weight can be hung in(v8.qnql ujvi+o, 2in any of the following four ways. In which case is the string most +(,jnqvilq.nu 82io v likely to break?

  96.39: Assume the objpcmkx,vt7g5jg 6v j+ ;ects in the following diagrams have equal mass and the strings holding tm, vvg 7+gt6cxjjp k;5hem in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniforr6bra v 5x,v;ue/3frrmly. 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 th r5rf ,r3r/xevb ;uav6e 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 4m,p(6jhrglj f l; 7gsinstant of time, the mass has position 2.0 m, h7,pgjgj( sfl4lm;6rvelocity 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 8y*t0qfut -vip +i )fga rough surface by a horizontal force of 1p8 tii f0tv- g+fqu*)y5 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 t7 ,srq)env:py3* n;kqda m.athe right is sliding to the right along the flo3vnnqr;,pk):eq7.sy tdaa m *or. 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 planeo;83p*qum p8nqx*kn bb9lbn8 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 fir 5z h /kde2+beptp; qxp4z:ak-ae u/9sst pulled across a horizontal steel plate as shown in the diah ezexa5a;4-sd/ e bzkp+ /t :kup9p2qgram 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 incline that makes the angle θ with the horizonb,en7eu,g c6 dtal. The block remains at rest as θ is slowly incd b,u6e 7cge,nreased. 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 angle of2ljr 2h- 2c ygle7rc3v $30^{\circ}$ 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 o/j+ej,*n- ukhpoqm5p n a second plane (where friction is significant) in inclined at the same angle, it will begin to acc j-/pmkue*, 5jpnohq +elerate 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 gpmc yf1gfdzdkgb h3t(( *) 07rravitational 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 showh1 d*0)b(7yfrdcgpz gf k(m 3tn 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*9sa/ifyuha 5l(( wzs 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 relationshil/ias(u(y 5w fs z9*ahps between

  08.20: A person pushes a bls m8rqq.4n -.ez ryh(eock of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclined 8 -z.hqyermqn e s4r(.$30^{\circ}$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 massvd7w-9 as6 ntj misplaced on an inclined plane of angle θ . When released, the block does not mov7t6nvjaw9d- s e. 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 f9bs3 l6p-ypa 69o1vaidu6k 9 hseqa8orom rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizonp3o6a 9d- v66o9sbua py 81sh 9laekiqtal. 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?