07.10: Contact forces are examples of which of the 6s2 ml;hwntd.;/q rmkfundamental forces?

  99.02: Which of the following terms is NOT related conceptually tt)s uwx8z3 mks;e -pbzq*as46 o the others?

  02.20: The graph shows the rela yy.*xyd6c-2n -xqt bationship between the mass of a number of rubber stoppers and ynxb-.2*t6 y a- qcyxdtheir resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labele p75inw-a q;bpd A,B, and C, remain at rest on a table. The magnitude of the gravitational force o7;ibnp 5q pwa-n 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 classroom ceilijik9/o a58 r,r 1wtjctng by a series of strings as shown in the figure. Which t/c58j ,kjri owat 9r1string has the greatest tension?

  16.05: In the figure shown, the mass mrqmhf,kzgh6u3a4z0+r x /q.j = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests 0h ,./h 3m q4zajzrfgq6 +xurkon 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 xs* b p3m y/u( v2wg89q3mbjihis most associated with the following statement: “For small displacements of an object from equilibriuyv m3ibm9*xh3( / gpju8bsq 2wm, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is ouc1h8kh2 u8lsx)*vs f( gm3f exerted at an angle of v oucsh 3)8xf8lu(1 gs*h m2kf$\theta$. 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 constqbscw*:(k8ptr2s 7lq 9w0lj d ant speed by means of a force P as shown to the right. Which of the following must b *kj:9(0st q prw8qdbswcl2l 7e true?

  99.08: A weight can be hung in any of tu :7uno*j8 lanhe following four ways. In which case is the string most liknauu7: o j8*nlely to break?

  96.39: Assume the objects in the following diagrams have em ;+hat+a*5i besvbg7qual mass and the strings holding them in place are identical. In which case would the string be m7aba+5*v +; sbeigtmh ost likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Whifuog36z j 5)+ynw bd-mch 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 ann6-u jdb3z 5gyfo )m+wy effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axi6l ,z-gfllpm em;a -x .0w5ge-fs:+-agktfves, at one instant of time, the mass has positio -m-,a tlv;-s6e 0:mgfak- lze.px el+wfgfg5n 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 pu+n e lzy5c1how:5*)+p dk/t/y cnkvjl shed to the right on a rough surface by a horizontal force of jentkd5+) ypw/c +yz /o:lh lv*5nck1 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 showstp( m mim4+m)d0qt .tn 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 tpm0ist +.m) tqmmd(4friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flb94+vjvo h i1eo l ;pn9h)4 +hnblil*uat plane inclined 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 sghkw* g9jldz knr,:/9hown in k n,zrg9:wldj k* 9h/gthe 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 angle θ with tcmg+ uv1 (lz.jhe horizontal. The block remains at rest as θ is slowly increased. The magngv1l+mz (.u cjitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block res/i y: szu8n x:w3,ol0k (*.cdvtkkj ldts on a flat plane 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 placed on a second plane (where fri,*k(9xsm6 b do ekk wpf+jktc8eg)8h,ction is significant) in inclined at the same angf(8*,ebk6+c ox pmtkj)8 h kd 9g,weskle, 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 gravi ( (7b4+m vcuyh*tzoxa.hs z(q.ujq3ltational 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 shown in the figure? The y-axis is paq uv(y3.tj*.h+h7smxu( zz 4 cloq b(erpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at ca4( kw xops(9wonstant speed 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 apww4a(s x9 okp(plied 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 b e9/v e6h:xef nlwtb2(lock of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclinxt(h wbe flev:n69e/2ed $30^{\circ}$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 massb.ryx,dz/o (b u3 tgq1 misplaced on an inclined plane of angle θ . When released, the block does not move. It is determ13 g(xz/d qrb,o.t ybuined 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, of the block?

  17.40: A small object of mass M is i (x,n7d bu8alreleased from rest at the top of a frictionless incline. The inclinehas ,nibx 7u ld8(aa 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?