07.10: Contact forces aree,6 0k *13s*cr) bincvinywiq examples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the o(az 8h*7gl dl h3abeu7/nr-blthers?

  02.20: The graph shows the r 2- -9gi0*jaugcpf eksp ,+iuqelationship between the mass of a number of rubber stoppers and their resulting weight on somie puq9s,jg +0a pfcgu2ki- *-e far-off 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 tab(08xeho)v y5, css0 +dawkq xple. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C()sxcq5kv0,+o wda8 yxp 0hse from block B?

  14.04: Three equal masses are +m 9gzmy)x;2 vvx5tj9skq5 7lh;qrvh suspended from a classroom ceiling by a series of strings as shown in the figure. hlhmxxkm+vs ;2 5jvtgq) zq;rv5 7y99 Which string has the greatest tension?

  16.05: In the figure shown .yhfhg9ec97rb s(s +al0e 5zax) beeh8wap11 , 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 stri)s8+c9hbg1pzahsrebha5 .0 al (1w xee7 yfe9ng connecting the masses?

  14.13: Which one of the following scientists isuuxcfec/:: , 2gkob7r most associated with the following stax,b eu /uo2 :cfgkc7:rtement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angle 0ekjo:u kklb;3n7d5f;rw q 0n of uoqkj 3 ; br:kdk;l00f5nn 7ew$\theta$. 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 woode,cbn ce/qd4u0 n box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which oc4 bqe0c/ dnu,f the following must be true?

  99.08: A weight can be hung in+p gbrnh81tr*awf* 0o(3zrc h any of the following four ways. In which case is the stringh na3f zghbr+t8*(cw pr0or*1 most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and kx22rcbr5n2k-6p dav the strings holding them in place are identical. In which case would the string be most likely to br2k2c r dprnv2b-ka5 x6eak?

  16.10: A person wishes to accelerate an ob 9vbc6hzt ;wd1ject upward uniformly. Which one 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 effecvct;d1wbz69h ts of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instant of time, the ma3 .(mstzm+;qzu2szvz ss hassz2qu3mzm+ (v .ztsz; position 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 the right on a r) 8tv5z pa6holough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly 5pl )6vh 8tozato 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 the right is sliding to :/*kmd :msa obthe right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient*o:: s dabk/mm 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 plane inclined at an angle of : a)kbo.tkii;$30^{\circ}$ 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 s,x * *fsk*lp p ige),nxhi9-p16s zisa horizontal steel plate as shown in the d ixpn s9x 6z*psh)gpf i*le-,1s,k* isiagram 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 incli:s;5tav3q su8u cbjrtd1cbjo4s2 69pne that 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 jc6:b4uss;bo atcu3 rjq 9dp5 8 12tsvon the block

  01.11: A 5 kg block rests on a flat plane incl8h,aquf)9 s tmined 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 nel;ta c8clc+b7a- /splane (where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. W a-;ls8ca b+tcne7l/chat is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a grurzf n- hc -:54,jzqwtavitational 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 szwtuc nh45,-j :fzqr-hown 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 4bykuk 25 8zh aanq12wfree body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external pubq yk 8zh 42a2na5w1uksh 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 Mzqvg.mj 5s,3e.e 2k0it+ ycxp+7h qqf =6.0 kg with a constant speed of 5.0 m/s straight up a gi+ 7px.fj03svtqq+2m.yeh,kez5 q cflat 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 inclined plane vgbc c jaha) ;5)x(9pe-ohd7aof angle θ . When released, the block does not move. It is determined that the normal force acting from the incline on the block has ;aca 5b(jg9p)7ceh -v)ad xh oa 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, of the block?

  17.40: A small object of mass M is relea,ss t0pef9 6te,grr ru4f2k9psed from rest at the top of a frictionless incline ,r,9 skr gf69fep0eurp4t t2s. 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 incline?