07.10: Contact forces are examples of which of the fundamental .j:oqn hx/w w2forces?

  99.02: Which of the followp ; j 6ih2eu4x w8b:gvv-;ddtking terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of g8ikdimf5q 5,1wu2 s/qb0fdnrubber stoppers and their resulting weight on some far-off planet. The slope of the graph iquwfd,f 1ib2055 8m/ sq gnidks a representation of the:

  10.15: Three blocks, labeled A,B, .r+pwrrbs(c1(nj9d e bwcm +3 and C, remain at rest on a table. The magnitude of the gravit (p bn 1wbjsc9cd.r err+3+mw(ational force on 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 ceilin o g8msq;+r +loukpq+uxe(6s4g by a series of strings as shown in the figure. Which string has the greate m86ulq+u rkex++ q(ps4so;go st tension?

  16.05: In the figure shown, the mass m = 6.0 k。a944kyda rpyc; q:h f,fnd the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices rekfq;frh94, 4d y ac:pypresents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most w3b;7a1i;d:kj v mb- 1nwor ujassociated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force ; n bawu:vbd7k3i 1om; j-1wrjthat is proportional to the displacement.”?

  94.26: As shown in the e poa cf8:g 3cb yj.)eks):y k6-o0sqraccompanying figure, a force F is exerted at an angle of 8rfgye0 )j -):o3c:cksqye.ko bsa6 p$\theta$. 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 horizth -g()i)zjv xontal floor at constant speed by means of a force P as shown to the right. Whic )zg t()ijx-hvh of the following must be true?

  99.08: A weight can be 4w;) h+7tau *qloyivthung in any of the following four ways. In which case is the string iytva+uw;h *q7lt)o4 most likely to break?

  96.39: Assume the objects in the following diagrams e p :yl4pqgv5y3zn*8s have equal mass and the strings holding t zpnyq:y5*v 48seg 3lphem in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object u3m* if)9,o bipag3cb v8p9g dtpward 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 of th*9o,pfa gib3 gi)c mp3b89vtde air or of the Earth’srotation.

  11.12: A 5.0 kg mass mov4)n(ve k8 4bfs1upwbn es along the x-axis, at one instant of time, the mass has posikb4)w8vpu fb( 1enn s4tion 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 a rough surface bykwu ot3cm/ h(2 coa54sm;d )uk a horizontal force of 15 N as shown, during the push, the object u 3tch so5wa2k/o m (mukd;c4)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 showoqac ;4i 1szaul3tz)4n 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 friction between tzzo ls3 q;a)i44t c1auhe box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane ince,an/8w ;v: k8gtbxk1folkk: lined 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 pulle+ 57f9g/g3jnu. d*ooc ifypd id across a horizontal steel plate as shown in the diagram A. 5 7oiyj9dpigofun */g +.f c3d
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 makesfg)5o 8, eaq+ nacph71mb 7uwf:wb hc1 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 fricti)acp fu1hawe,bfc+ 7hqmb:wo8 5g17n onal force of the incline on the block

  01.11: A 5 kg block rests on a flatm, t3:vdf4j-fc2bguunh8 of7 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 fricp/av8b je-9lmtion is significant) in 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? v9jel8p/am b-

  08.08: An object on an inclined plane has a gravitaticm6 q2r6nueho bzi1;+ onal force of magnitude N 10 acting on it fi; c6 r1uzb hq6nem+2orom 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 to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at co6 vwm56:. -owx --ia 6hpm1xaajmbhcm nstant speed on an inclined plane. The free bodya-cm. b ah mm:mpahow-66 6v5wijx1 x- 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. 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 sp*jb.hm6-v4vnb w3vo xeed of 5.0 m/s straight up a f vx.mbw*-vh3o 6vb 4jnlat 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 s -30vg6clj5 ofc )clbinclined plane of angle θ . When released, the block does not move. It is determined that the normal for jbc65foc-s g3lc v0l)ce 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 released from rest at thv bk49q ff:bn 0rkxsn3c (40tle top of a frictionless incline. The inclinehas a mas(rftknlk0 cx0qs39f4nv bb4:s 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?