07.10: Contact forces are examples of which of the fundamental forces?f:vj8ly z ioj*ddh -inv6u*7(

  99.02: Which of the following terms+; z1qatt/tmha/ h s+q is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number ofupb5rxish73d+t z ; -j rubber stoppers and their+;t-p7d jxh35u sbizr 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 rejmedb36iz k ,4 uc*c mw 1ht(hs:3ykzzvrw,( 3st on a table. The magnitude of the gravitak( 34md*h sz,e3, yui vczzcjmr :w6(3whk 1tbtional force 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 masse-.s xw z,lj:tqr1ej 1os are suspended from a classroom ceiling by a series of strings as shown i1sxj,.wo:t1lr - q zejn the figure. Which string has the greatest tension?

  16.05: In the figure shown, thehym. a; .ctyf uu5fn4vy+p1g ( 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 string connecting tfy;c1g .45 uup(y vy+n.afht mhe masses?

  14.13: Which one of the following scientist zcvr25s:tl9ax)a(k cs is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is pro:5a9(2svatlxczc k r)portional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted b, qir10 cts3fze9p2d at an angle of d9s2e0irtf3 ,qp1 zbc$\theta$. 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 flo0m-1dv25hy mfjxt) wh uw e03:ujmx.tor at constant speed by means ofw10jjhex0t yv-5:m .wmhm ut df3u)2x a force P as shown to the right. Which of the following must be true?

  99.08: A weight can be hungd7p7xrn1tiu2 in any of the following four ways. In which case is the string most ldi7 x7p 2tunr1ikely to break?

  96.39: Assume the objects in the following diagrams have equal mass and the s jlyzkbs 6i0/7trings holdingizyj s /70bl6k them 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 uniformdt-(p5wucyro ea4f ,bq m ;4w:ly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the magnit5ya;f 4(r,qb:wmued- twop 4c ude 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 t j si5d5+jhy0qhe x-axis, at one instant of time, the mass has position 2.0 m, velocity 3sj50hj 5 id+qy.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 .um5f8zack1 9 t./(wdobh6zqt (xoq z pushed to the right on a rough surface by a horizontal force of 15 N as tuzkd9xf/bz. zo( 6 c(.tq1haqm5 8 wo 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 f4np dik4;pi(f igure 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;p4i4kn fpid( of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flan +.,aas 6yyrlm *2ext: bjtu;t 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.d-ac nxdzs3 2uhw67 x first pulled across a horizontal steel plate as shown in thnu d3hdcz-.7s2a xw x6e diagram 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 horizo hujt20y *s/bdntal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static fricti* 0s2bj hyud/tonal force of the incline on the block

  01.11: A 5 kg block rests on a flat plane ym csf( q9ko(: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 plm/o.qe *bme8qaced on a second plane (where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the secb *em.o /e8mqqond inclined plane?

  08.08: An object on an inclined plane has a gravitarq a7b,nol(z ;32z u vceca7(ptional force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitatie lzn;3 razc2 b,(uvaqp7(o7conal 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 spe;gc w1(b jsgu .hmquic5.t.6 sed on an inclined plane. The free body diagram of the object is sho q5icwghujm1c( sg.b.t su6; .wn 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 m8yz,vwb8y jt ( s4 die5it1a0ctjc3 q6ass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclis18it4c6(b e,0yw c vtit5jjd yq 3a8zned $30^{\circ}$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 masmt s9)m4a hj2tm0 xgt z2i/dq:s misplaced 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 friction acting on the block has a magnitude of 38 N. The coefficient of static friction betweem mg)2sitxd:9mzqha t402 /jtn 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 5 1b1--vrikof-ydvd r 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 slides. During the slide, what is the magnitude of the normal force from the table on the ino1-5 yv1rbk iddfr- v-cline?