07.10: Contact forces are examples of which of the fundamental forc plks3 . *0gv2f gj *xnps.jqynx2;in6es?

  99.02: Which of the following t ku0jk ov8s/(w+2zli -yy:c oherms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number o4jd8so v-k a 02zsrs(gf rubber stoppers and their resulting weight on some far-off planet. The 8-sodsksr(ag40 jv 2zslope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C114;*z5trtwbq n mgiu9q e j:l, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitudemi qe;54l qzu r9g1*tjbt:w1 n of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a cl.j8jlg u 2b5sxassroom ceiling by a series of strings as shown in the figure. Which string has the greatest tesjg 2lj5u8.x bnsion?

  16.05: In the figure shown, the mass m = 6.0 k。a16vq (t e85 spt7 icis-qkq,wjnd the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents th w1ieqci- tj v86(stps75,qqke tension in the string connecting the masses?

  14.13: Which one of the following scientists is most9z8miwcf :evtq 5 3r)o associated with the following statement: “For small displacements of an object from equilibrium, the tvmfeo: 8rw93i 5q)zcre 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 angfh unxm30v) / q(amxf0le of x)haqu0 03 mnf/f xv(m$\theta$. 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 al51,4 7uuvh2o 0t8mmo lqtk5 ahf:ttj xong a rough horizontal floor at constant speed by means of a force P as shown to the847tf0hv,mjuotta5 5 :t q2u1oxkm lh right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In w28vt e.rtnb3x5 ahl4ahich case is the string most likely to break?42t5bh.ar v8eltnx 3a

  96.39: Assume the objects in the follow s( 5t0p;vuuxga77pmr ing diagrams have equal mass and the strings holding them in place are identical. In which case would the string be mopupuv7(t0smg a5 x;7r st likely to break?

  16.10: A person wishes to accelerate an obwzx(/x6-eikekh n5i9 ject upward uniformly. Which one of the following choices must be true of the force F, provided by the person 6iix(/zk9 ek5whnxe- onto the object? W represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves alone;o c/bvog1)u62 2ahwvk vd m2g the x-axis, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and accv1b u/wghv2m ;o ac6o2kd)v e2eleration $4.0\;m/s^{2}$ . 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:dxig (;lj/ nj a rough surface by a horizontal force of 15 N as shown, during the push, the objgi xjnj;:d (l/ect 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 th ebm3 6nqa3 sf,s7i1jje figure to the right is sliding to the right along the floor. A horizoajs q6es 313in7bf, mjntal force of 10.0 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 atpv(- t1aclyqq +, fw2n 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 horizonta, (er0vnvdvz i 2w1-17jhrsf tl steel plate as shown in the diagramev1fdjh0wtv 2insr7rzv - (1, 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 -zbo2zd6w/16xb. flxw 7rxwjq ) xae9 θ with the horizontal. The block remains at rest as θ is slowly incr jlxbw19erazb7z6x of /xq)d2xww-6. eased. 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 angle of cdcqss2.+zbv zcm0(bow8t24d i u3:u $30^{\circ}$ 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 fridx0pmvce: wz9: zy6z 0ction is significant) in0pz:c z e:vzxwm9y 06d inclined at 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 g p b da9*bx+b-4skd;han inclined plane has a gravitational 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 perpendicular ;d+b9- ahbp sx4*bgkdto the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushy6irpj0 r: r,,rr3jmu-t osg4ed at constant 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 applied external push parallel to the incline by F, and the normal force with the surface by n. Whijr,,- 3g6ru ory0r 4its: jpmrch one of the following choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with0zsjjp.jzh4 6rf ,m 7y a constant speed of 5.0 m/s straight up a flat sur6zp s0zjrjhy7fm j 4.,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 block of mass misplaced on ap-.lp 6r/ b).dk;2zm rqnqi aan 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 coefficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the km q-iaa);pn /2.zprq6. rbld mass,m, of the block?

  17.40: A small object of 6t-8wrd . srcumass M is released from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal st.8r -6uwdrc. 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?