07.10: Contact forces are examp(s wa-j/nf4llles of which of the fundamental forces?

  99.02: Which of the following terms is NOT related con1iclh9do(a w a7 (d.ha75xjh hceptually to the others?

  02.20: The graph shows the relationship between the mass ofo(u ed wucp,hz4h22p a:yth) : a number of rubber stoppers and their resulting weight on some far-of4h t2a:opcz,pyhu:u 2 )h(dewf planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The magnitudo7 lzy7irm+4b e of the gravitational force on each block is indicated on the izym+l 7or74bfigure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling g/kp)ccwuu g2( 4gf2x l()yrsutd((mby a series of strings as shown in the figure. Which string has the (l(u/( ws(ckg2fcg xd tg2y)u pmu )r4greatest tension?

  16.05: In the figure shown, the mass m = 69+ 8m puqv5odo3yz9n j avu,ywu( 2q2x.0 k。and the mass M = 14.0 k。are stationary. The mass M restsd895anxuo+,wz(qo2 v2vjuum9y 3 y qp on the floor. 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 associated witg h/1d/2lk ofwh the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to gdlh1//2o wfk the displacement.”?

  94.26: As shown in the accompanying figure, a for;-g5t.lqiy- xl:b rvace F is exerted at an angle of x tg q:a5il.ylb-;-vr$\theta$. 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 consmest/j*x cg( b bplcks7;5 :5ptant speed by means of a focl( 7x;/ bm5 psck:pjt5egs*brce P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the folloy pbhb jq+me- jpq 9ot(:lw796wing four ways. In which case is the strqh:m99b-(pj o b6jqpely t+ 7wing most likely to break?

  96.39: Assume the objects in the following diagr8:;hmkmwv k -g7r+-h mvkvl3xams have equal mass and the strings holding them in place are identical. In which case mw-8 +:v ;g37hmv- hrkkkxvlm would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one ml0 u+-zwc8jhy*t9g u 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 ut*hl 8y-gw cj0+u9mz the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-u jhl )ccmiwn8:o:q) 3sb.j(q z9r+sdaxis, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and:w9b) uoscsjd:lr+j( .nq)8mi 3q hcz 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 surf8 8hs1l bgl *jz,c hu-thv/woc1dxh8)ace by a horizontal force oc8hvlhj - wbh hsg811czt/d8x *u,l) of 15 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 9 , +xyszi5c8t.eendk7v.4szac2s xy 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 floc5ss 79 x.+ned4avexs2cyi8,.yz ztkor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inclineqen3 sn6a4ka9 d 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 horizontal steel plate as shown in1f 4byw8t:ksw the :wks8f1ty 4bw 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 -ikcogw zv*,18toe :langle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitu8-cv1ol,*wgt :ikoe zdes 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 playsvj9y)naxbj/p2h 1:2 iz:n k0oz2 gene 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 play6s5 v6kaih1 4 w)defdced on a second plane (where friction is significant) in in6f iy1)4aehsd6 v5 wkdclined 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 second inclined plane?

  08.08: An object on an inclined plane ha7dpn(q0wt 15j )4kjl:dtyhhzs a gravitational force of magnitude N 10 acting on it from the Earth. Which o4ztdkn 5jd7 t)jhlypqhw 0 1(:f the following gives the correct 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 inclimb; dwm lk45)jned plane. The free body dw bd4) 5jk;lmmiagram 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 relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constantsaxv :eqp8wg+)m 83jv speed of 5.0 m/s straight up a flat surface incqegp m8w)s8a xjv3v: +lined $30^{\circ}$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 o1 jtcwv;99 bphf mass 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 between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, ofjc9h bv1pwt9; the block?

  17.40: A small object of mass M is released from rest at the top of a frictqwkkz6d fiew23 mrea )y:f4:( ionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as w6r4wfk:kdi fz:(3q)em a2 eythesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?