07.10: Contact forces are examples of which of thv j6tkbsrx)wv 95. j:h57eyi7cf fkd.e fundamental forces?

  99.02: Which of the following terms is NOT relatem+t*l: hxf rd5d conceptually to the others?

  02.20: The graph shows the relationship between the mass of a nuyz. )3ux;ou *zxgz6xpmber of rubber stoppers and their resulting weight on some f ;6g ux3xxp)zz *.uyzoar-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest ip u/e e;emw+ 2 tl52vasu1hd.on a table. The magnitude of the gravitational force on each block is indicated on the figure. Wha1 ;m.e2/u l2ee+dpuwi vta 5sht is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended fr06i3gfuis aylx* f+ r f2./ddvom a classroom ceiling by a series of strings as shown in the figure. af6i *ilx32d. v/g0urffs dy+Which string has the greatest tension?

  16.05: In the figure shown, the mass ucomo ew 1,v1owdx 8ye.)xw*a t k.xyc o/+59lm = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. ee )l x/ooty1oxw au9owx .v*,kcm.18 +wcd5y Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following sciec 5jace-*jwu2a 3 qu9kntists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restori ajuq jk3u- a*25c9wecng force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angle h o(xuyi g05gm*76k nnof k7 *0ngmhigu6(xo5n y$\theta$. 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 e gmkq3;*ok:c4 b1w6pfvl3dd wooden box along a rough horizontal floor at constant speed by means of a force P a: mow6k;4dve1f3 pb d qgck3*ls shown to the right. Which of the following must be true?

  99.08: A weight can uhq *m;60-w.n n.lwlj,ufp u:q n1rkqbe hung in any of the following four ways. In which case is the string most likely to n6u ;k,wp 1:fu hmq..-wq*qunl jl0 nrbreak?

  96.39: Assume the objects in fh. mr1er/kq+ve2b1cthe following diagrams have equal mass and the strings holding them in place are identical. In which case would the strirr+fe2.1h1qv/ek cm b ng be most likely to break?

  16.10: A person wishes to ac+78r8i2 +i;lgsneht )sbvx jd celerate an object 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 gl82vnsb8ghr;etdij7 i+ s x)+ravitational 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 instant of time, thoirm i 0vl6q70e mass has mqlr6i0v 70ioposition 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 kqsn3:/ ugp :fa rough surface by a horizontal force of 15 N as shown, during the 3kgsq p:/fun: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 shown in the figure to the right p.x37sf.fms 4 qhiw 9/jeqp2egu0uv7is sliding to the right along the floor. A horizontal force of 10.0 N is being appjefqf7/ e.97 p wqhsvm sp 0u2xu.gi34lied 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 incll9o5py1f ax;c71qxpw yy *to,ined 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 shodog bf27 pn5op(l5s: us0jvu9wn in the diagrjd5gfu:9 s5 l702nbopp o s(vuam 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 orzhg, +fr- hp.n an incline that makes the angle θ with the horizontal. The block remains at rest af-+h pr. rhz,gs θ is slowly increased. 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 fa0l::s ttzs p12azh a8lat 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 (w iiiy-:5.qe+to qtxz*here friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force teq:iiq y*+-zxo .ti5of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitatgprp 6nzxr r37*8n,vg ional 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 coordinatpr83g7zx nrp ngr*6v, e 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 speed on,o25zdi obc+i3k m bq ;3h(opn 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 noricqi hpb3mzo;o( d+bn5o2 ,3 kmal 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 constanthcfcm4 m(yo;, rjl9/t speed of 5.0 m/s 9m4/yrt(hl;jo,m fccstraight 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 ai3svyabx nx7fpai 8(n6g 9p j2ri(. 6xn 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 coefficienas6(n2njxbygiv98xa(rixpf 6 .p7i 3 t 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 tj l;0rn x2hr;ghe top of a frictionless incline. Th; xjrg2;rlh n0e 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?