07.10: Contact forces are 7 qn8vgjej0d; g v/.ctexamples of which of the fundamental forces?

  99.02: Which of the following ternzwwci8ez 6j1j32fp(ik0r ) jms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rub wge;xb-q0yr+f i55im ber stoppers and their resulting weight on some far-off planet. The slope of the graph isiw0;r+e5 -gm5 bxyfqi a representation of the:

  10.15: Three blocks, labeled A,B,loi,- (rm+ 6zevtp) lahppw;2 and C, remain at rest on a table. The magnitude of the gravitational force on each 6 i;tl pm,-wvze ar) p+(pol2hblock 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 suspend 1 2fxkt8zpp-ved from a classroom ceiling by a series of strings as shown in the figure. Which skz82p fpv1 xt-tring has the greatest tension?

  16.05: In the figure shown, the o -ksgws a+r3jk8z3f,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 string connecting the m83kg+ z3k wj-ofas, srasses?

  14.13: Which one of the following sciec/1a,t,; bp8 b7ejt0vzha d:dq eq c:entists is most associated with the following statement: “For sm :1 h/ e0 btjcc 7eepdzv,dqa8ab:tq;,all 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 is4j em (edck4y3o2u1bo exerted at an angle of jke1b4(oy cud3mo2 e4$\theta$. 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 floori2b *rget- l ,9tyrwi2 at constant speed by means of a force P as shown to the right. Wh-w 9,tbrri2 * e2tlgyiich of the following must be true?

  99.08: A weight can be hung in any of the following four wa: 8ztu4d w+sq+o jrd:rys. In which case is the s:+dq s: 8dr z4wjurt+otring most likely to break?

  96.39: Assume the objects in the following diagrams have e t 1+x9c0k;wcvbzmph 4qual mass and the strings holding them in place are identical. In whi4wtkvzcp0m; h+b 19x cch case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upwardqxdk n9v, j (cf20q:hd 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 effects jvdk 9cd:0 q( n,qf2xhof 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 mass havpvc8 6,n9b t/tpiu 9cs position 2.0 m, velocity 3.0 m/s,and6 npvv/t8i c9utp,cb9 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 roug/8,otq m).o3j mq xenc oabwa00;v3smh surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right a.j,)xc 8 o3oq;eb0smmqavw3t/mao0n t 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 8qa l0ip1 qg8iright is sliding to the right along the floor. A horizontal force of 08 iqal q1gpi810.0 N is being applied to the right. The coefficient 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 p f7b*4( naz iy1wy*q0pkn*pw 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 pulj+m8z cjpnn; ;ym3a 1 3r-bztiled across a horizontal steel plate as shown in the diagrmjmbnt z3 i ;+a3j-c8;z1pynram 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 ml daooz:1mdabq/q8 7)a7sz9z akes 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 inc q1azd/ba9:zzs ) 8oqdmo 7la7line on the block

  01.11: A 5 kg block rests on a flat plane incsxa .9qv p0) 3lovoev6lined 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 friction iszr-t,h(2s)7o8u)ym tmw g-lfkc2 j ic significant) in inclined a7c8)kz uit2f t2j(, mg-m y-w)hcsolrt 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 inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magnitude N*f 1(zvhedovzh-nx-0 10 acting on it from the Earth. Which of the folhohvd -zn-(xz v 0ef1*lowing 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 spehq a7-60q3e w0crk1p2qge qbk/+kf sked 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 incline by F, and the normal force wi6khq03ap q1-k qbe/ ceqkw+20fr7skg th the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block oflop9l,c; t*- 1w he r.eknvh8) a+hsry mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surro8ace .lnptvy wh)+lrhk ;,se1 *h9-face 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 bloc6fe4i 4* oigcq2wk4coczadt ;.ve2 v,k of mass misplaced on an inclined 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 ;ev*iq, e.dk4vi62az2wgf44 oot ccc 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 frictionlm0zh e;24 seguess incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as thesmall ob;z2 uge4seh0mject slides. During the slide, what is the magnitude of the normal force from the table on the incline?