07.10: Contact forces are examples of which of the funda7.v7q p8 g qs.iv9dh )j nt1fwsgpdb(;mental forces?

  99.02: Which of the following terms is NOT relatedne3i5l, 5 afj75ijk jm conceptually to the others?

  02.20: The graph shows the re8s0 s rajw8(/ht-esyz lationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The 08tzj a ss yw8r-s/h(eslope of the graph is a representation of the:

  10.15: Three blocks, upl ,-q/ ncp 27urjzs;labeled A,B, and C, remain at rest on a table. The magnitude o2/;pnz-luc7 ujr, sp qf the gravitational 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 masses are suspended from a classrois2inr ia z0i+g tygk8d2x9uy ; ,n3p-om ceiling by a series of strings as shown in the figursin ,02 yi gztpnr 8iy 9a3k2i;xg-+ude. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。are 3hd0yw)cf1nh ntqs,: stationary. The mass M rests on the floor. Which one of the following choices represents 3yhq :nnd1f , c0)shwtthe tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated witq .t 8bq+:d2y,gom7) l iuwzf ,ymuz*oh the following statement: “For small displacements of an object from equilibrium, there is a restoring force thau* y by :,udm,lo+)qfwioz7zq2 g .t8mt is proportional to the displacement.”?

  94.26: As shown in the accompanyin:z mmy sjsd 05/y)9gayg figure, a force F is exerted at an angle of ydj y m) /saym:9z50sg$\theta$. 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 pullt*oq:w0c5g mts a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the fgtw tq5m*:o0c ollowing must be true?

  99.08: A weight can be hung in any of the following . o m6 dp2jv:iayx vqrc86i*0efour ways. In which case is the string most likely to brea2r dq:6 0.maj6ixie p*c v8ovyk?

  96.39: Assume the objects in the following diagrams have eq1f, sz( ow8dzzy4ox) sc)d-hgual mass and the strings holding them in place are identical. In which case would the sy8,)oozxdszd-c 1z) fg h ws(4tring be most likely to break?

  16.10: A person wishes to accelerate an object af((zga;ltb)* j)vd1ke6y jr upward uniformly. Which one of the following choices must be true of the force F, provided by the person onto tkj vly); 61)zt*gjab fd (er(ahe 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 alonf zjtn .94ga; ven*9*n+f4f mjdiiyh9g the x-axis, at one instant of time, the mass has positihf*f je4it.9j;*a9i m ydfnn+ v9 zgn4on 2.0 m, 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 ; u;)mtrzjw,j66trdm gsv2m2 the right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly rdm 22)m,;6 m;stvg6zuj jrw tto 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 t(jgf2de6zhdj7 kwg8r n 0m)k.he 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 betweh6k d m8gnkge 7.)w0djj(fr2zen the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inclined at an angle af02uggcs /3 vof $30^{\circ}$ 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 hori:jfqbrock,sos) (6npgfp //,zontal steel plate as shown in the diagram A.(o:r ,o c q spbfp6,/g/sj)fnk
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 anb:v06r*hl kb s+ub8rb gle θ with the horizontal. The block remains vbu6l:s b8hr*bk+0 rbat rest as θ is slowly increased. 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 ang.wj)*z lh(p o t.6qonn:st2 fyle 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 se0 x(sxlfir+b7a58w lhg4fl y3cond 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 second inclinlw+r3 ix7bxhsa(5fy0 lf8 4lg ed plane?

  08.08: An object on an inclined planeb62mk gjt;2g h2s/idax3m dn 5 has a gravitational force of magnitude N 10 acting on it from the Earthd;2st3nk6bm ai xg 2 hd5m2/jg. Which of 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 inclined plane. The frgz+o 4dbqduf:12)nz vee body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the)bq1 +gnoz42zdvdf:u 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 constant spe 6u)b 0(tvvutned of 5.0 m/s st(v6ntvb)0uu traight up 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 misplaced on an incline 0ydrzzlb: m79g.i nh.d 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 plan7zr.hynd 0ib: z ml.9ge 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 resax-g+)s zz41qopki3o z9 7zlb9e ew)pt 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 tabl)s 93zki goxw-)qp9 e4az7l1opzz+eb e as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?