07.10: Contact forces are examples of which of the r1cmnqt i 3h,. ct5uw7fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to t10n ne a-j)e)prkv6ly he others?

  02.20: The graph shows the relationship between the mass of a num6fqsae 4i -l5ober of rubber stopperiaf 5os46le-qs and their 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 01mnwh7i zxr :C, remain at rest on a table. 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 from bln rzi0 h7wm:x1ock B?

  14.04: Three equal masses are suspended from a cla7osa5r jj)v5 )f ppb)3oi* jfcssroom ceiling by a series of strings as shown in the figure. Which fj)arp)s 5)oji cop7b v5j3f*string has the greatest tension?

  16.05: In the figure showwnu;/,j i 9z;ih gka0ph vp*3qn, 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 choi,/hnv9h; qgiu *;jp0w3i kazp ces represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most s3m/ / ki0c j;o+cjeebassociated with the following ms/ c+;3bc ki0jejoe/ statement: “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 forcv yh u-:oliasj/e4c3/ e F is exerted at an angle of jh3cv-/ieluo asy /4:$\theta$. 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 fk c(.a9) aiyhovzcdbogq8+fd9 ,.:hjloor at constant speed by means of a force o9) .9.z( hdv aj+dy:fa8ci khcbg oq,P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. nxakqd ); dfpbglo/ p h/59m1:In which case is the string;x/g bho n a:df/5pmd9l1)qkp most likely to break?

  96.39: Assume the objects in the following diagrams-j 4orw3+ ) yrpbtyvb0 have equal mass and the strings holding them in place are identical. In which case would 4p+yyr0 3v-bw)jrbtothe string be most likely to break?

  16.10: A person wishes to accelerate an object u+jdv, vpwys1clas68 hz o:-6epward 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.8vdcvz:6pe-,j1yah s +w 6sol 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 instant of time, tr)+rp1wrvww9agb 8l6he mass has position 2.0 m, velo +wavgr81wrp b69)lrwcity 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 rightsu h f:prqpb78:- we:/- fbrtz.cyd9 p on a rough surface by a horizontal force of 15 N as shown, during the pusw: f8:rp t be9-h.y/zp:s db cr-fu7pqh, 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 box0k75i1a35h nq tv2df,t c lisj shown 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 kineti1si n0jq h5d7 2af,v3titcl5kc 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 aiol4ox) v 2awbd vn*7j n 4n11f/cm8u$30^{\circ}$ 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+j5rnsr bxyg98 w e*p/ pulled across a horizontal steel plate as shown in the diagram A. *rj e9/ ngr+sbp8yx5 w
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 inclin.iom gp/7to,edutm 5 hak8:(pe that makes the angle θ with the horizontal. The block remains at rest as θ is slowly itutp5 i h,d:mp (8/gok7.e moancreased. 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 anglo. g0xvgib)r7jisdd xlb.3qu99 sf 0+e 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 plane (where i/4fbt -i,r ) l(ieubkfriction is significant) in inclined at the same angle, it will begin to acceleratel uefb,)it-(ri ib/4k 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 gravihi- u99(*osqrsvgp8 itational 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 8uip(qis9*ors -hvg 9axes 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 spee8f4ro:)npsi f d on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the ii 4pn s)o:r8ffncline 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 of 55odqfh1: s(d2fw iaxuq q(sbi(y2/ z7 .0 m/s s y7 u(qhfi (:1d2bwqzsd(f25qix sa/otraight 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 inclined plane of angle θ . Wi(/f ) ;ikt11l4fxn+a (dt 2k ygtrqxuhen released, the block does not move. It is determined that the normal force acting from the incline on the block has aaiklnx (trd;t(4ig2f+1kyf t u)x q1/ 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 released from rest at the top of a frictiona)5 f eev2j:sfless 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 sa5vjf2:)f e eincline?