07.10: Contact forces are examples of which ort( pxop ,a6uwl2).) ud5 d3r wz(gpzof the fundamental forces?

  99.02: Which of the following terms ib+qq mfpd 3q+42t9t tqs NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rub/kkbz.*slvi,t;ohap* ;6f v zber stoppers and their resulting weight on some far-off planet. The s vst;*kzkhz apf*i/ ;6.l vob,lope of the graph is a representation of the:

  10.15: Three blocks, labeled Ac, 9wuc0yjfz f v43by3,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What j4 z3y f cy,0fcbu9vw3is the magnitude of the contact force on block C from block B?

  14.04: Three equal massevn 5g,4wl pfa9s are suspended from a classroom ceiling by a series of strings as shown in the figure. Which string has the grew5p nl49gvf a,atest tension?

  16.05: In the figure shown, the mass m = 6.c;qnn:9aq 94wb8 *s)dz dma hw0 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;s )qwn4h:9aa c9z d*qb n8wdm in the string connecting the masses?

  14.13: Which one of the following scientists is most associated withk yw3x3 *ptnjyd.:; b, xgy:tq the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proxty w,b: xjk*y3:;ptg.dy q3nportional to the displacement.”?

  94.26: As shown in the accompanyingii e8g f.qew2cka;vmp06c.u : figure, a force F is exerted at an angle of awukq . cv0g2fi8mi;: 6eec. p$\theta$. 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 constant.rkit( )uo;ep9/noowfo ,-s u speed by means of a force P as shown to the right. Which of the followinguknu o rwso 9ie t/.o);o,fp(- must be true?

  99.08: A weight can be hung in any of the following four w47,+ 0rc0g ai7 2(lefn2wqrbr svy0:t xdyyhs ays. In which case is the strin ey rs7rcb:w ytrl,aqh2dng 4 vf0(2+ sx0i7y0g most likely to break?

  96.39: Assume the obj8s8 f :sm-1+k yjlefkyects in the following diagrams have equal mass and the strings holding them in place +l 8:kjs s8m eyfyfk-1are identical. In which case would the string be most likely to break?

  16.10: A person wishes t4ktyv; 9hojqh54q n4do accelerate an object upward uniformly. Which one of the following choices must be true of the force F, provided by the person onto the obv;qok y54 4dqt4hh nj9ject? 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 along the x-axis, at one instd ep2(3ff9ln z3lfuthbiu5 ;wox ;.(jant of time, the mass has position 2.0 m, velocity 353 f ftjo(x3u(;e .ll up2b;hnf9id zw.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 a rou/.w nbr. dez3jgh surface by a horizontal force of 15 N as shown, during the push, the object accelern .z3r/ bwdj.eates 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 showol m7srrhh ,a6k(7rp; l5zuk8n in the figure 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 mr u;5s ( ll7krk8hp7aoh6rz,floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane incl*rs7 brp6 (:dini3wkxs,,s gqined 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 .t,- aebje* xuvky 6c9h7dfh2)e se)- spxd/mfirst pulled across a horizontal steel plate as shown in the diagram hxke)pe7 ddf*6atey9jv.x u)h2 /,-s -emcsbA.
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 makkt9ul/1pioh zdel 5,,es the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The mag,19 5/ilt hupkz,e ldonitudes 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 bq-v2gt 9)oh9srnudkk;:iz 8oy 3p)k 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 onql8xl g i4s59f a second plane (where friction is significant) in inclined at the same angle,qxlgs8 f 95l4i 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 has a gravitational eejdb 1u0r11 xforce of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components oj1r1 eb1 e0uxdf 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 be0p28n,elyz wf5 j/iaging pushed at constant speed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction forc z jwynp50/,alfig82ee 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 constant speed ofs*s3 mis +2*mih9 kaoa 5.0 m/s straight up a flat surface incl3saim o 9i2s+h m*k*sained $30^{\circ}$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 inclined plane of angle θ . 8d.3iwfge1 fie57g fuf mj- l7 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 choied7u.7mf1f e wg8ji f5lg-f3i ces best represents the mass,m, of the block?

  17.40: A small object of mass M is released from rest ata8ac 7 o no,/o0xrjhd7 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 normdao n780ha7 oco jrx,/al force from the table on the incline?