07.10: Contact forces are example2bwg4yw;h i0os of which of the fundamental forces?

  99.02: Which of the followino- v*jy xskeq -+g5rew9t6i5tg terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship betweeb xf4zhvnx -gn5+5jl. n the mass of a number of rubber stoppers and their resulting weight on some far-off planet. bnjh l5fg 4xxzn +v.-5The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest onxmik6rwn(y u3 :*5qk,5ss dcg a table. The magnitude of the gravitational force sywsd 3, rmx q:g (un55kc6ik*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 ar60/vrlshlkrjw:o .+g e suspended from a classroom ceiling by a series of strings as shown in the figure. Which string has the greatest tes+ l. vwoh/6:glj0rrknsion?

  16.05: In the figure sha.7rt .v avf/mown, 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 the tension in the strinrf am..vav /7tg connecting the masses?

  14.13: Which one of the f3flvh,zju+ tjs):ah7ryc /1+ uj8pl aollowing scientists is most associated with the following statement: “For small displacements of an object froms8ut pjl +)z h+v1j 3rhylj7ca/ fua:, equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure,e 84l ,h at6jgcyfz0h1r. 2k8kzp3drw a force F is exerted at an angle of 0yr,hl 2ft k g6 zdcra43.1wpzh kj8e8$\theta$. 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 boxc,lqvjo /pn;7 along a rough horizontal floor at constant speed by mepj ;n/lv7oq,c ans 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 the following four ways. In whr:pxgu j kzy- u x 3;xtl4)1dkxqx0g,0ich case is the string most l-31x duxxkl:q 0y) px0r j4gu;x ktgz,ikely to break?

  96.39: Assume the objects in the following d), jal849ik wkqfklu;iagrams have equal mass and the strings holding them in place are identical. Ink9w8lqfk ) u4a;j ilk, which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which onnrg3f0 xfen 23e 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 airf3nn3x 02r feg or of the Earth’srotation.

  11.12: A 5.0 kg mass moves alonu.j98z p6oj78nkfit 8b8xb ocg the x-axis, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and acce k.tci j8 ouxb8j7fp86n89zobleration $4.0\;m/s^{2}$ . 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 oh9bpm vndd r7uk1**/un a rough surface by a horizontal force of 15 N as shown, u7*n* /bpvrumd d91khduring 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 nuqfb,*mb5 x3 to the right is sliding to the right along the floor. A horizontal force of 10.0 N is,x5b qb*mu fn3 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 n4xdppqx( ;t3plane 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 kqev,pt .ihz1ly- v2 5horizontal steel plate as shown in the diagram A.ze5tvpvy,12qk- i. hl
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 thatosabe81t8ny ltybhy) *u-5 w6 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 of the incline on the blw*e)nt hyuy yb 5ls-t6 b818oaock

  01.11: A 5 kg block rests on a flat plane inclinezxweq ss:nk /g9p+;xjauzap0 +j, 7a 7d 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 f t6 jx0hdl;- g.-vm aei lyw1r8b3vh6uriction is significant) in inclined at the same angle, it will begin to accelerate at 2.0. -6 it0lhvuabx w-ge;6rh8 jydlm13v 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, imv f 4*n hqkgr9arj0scix07 /8om;g a gravitational 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 fig4rjhm8*ikcs 0gv/orf,a g;n0m9i7 x q ure? 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 bei24aoj trd (i7t ;0xarzng pushed at constant speed on an inclined plane. The free body diagram of th; x a0r4or7(dza2 ijtte 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 relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a conm s kp,t)kmdw6j.: wt )m :kj:lf4stu*stant speed of 5.0 m/s straight ups.j k) t:*tsu:k6k4lwmw:,)mf pmdtj 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 mi2o1mq*nf58cg3.ub ogiaw8 b y splaced on an inclined 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 frictiocm81 .3waobf b25uo8qyn igg*n 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 the top of a fri8js ,hkz u9bn,hai,,lctionless incline. The inclinehas a mass M and makes an ansbuj,ni9ah 8z,,klh,gle 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?