07.10: Contact forces are examples ofzgbv /p,hl/ o9r 2im*z which of the fundamental forces?

  99.02: Which of the followingef pl6kf( omvdnv*pu3169 (av terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber;6o 2vfds1esg stoppers and their resulting weight on some far-off planet. The sl gs1ed sf;2o6vope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B,bflkv297n dh r42+/4m le mshl and C, remain at rest on a table. The magnitude of the gravitational f9lf4b r2l+/ se2lhmv7n4d hkm orce 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 clas6)d( :*/lqw-2m rcsl5uyi tkbktib0 i sroom ceiling by a series of strings as shown in /r t:ml*qbydi t5ul-kiki6w() sc20b the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass7/jb8rq qyaqe-,jk (nisa6xt8soa0q/ 6t 8hf M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices repre ta7nj tqrse/ifq-6 0h/8y8aj q boq8a( sx,k6sents the tension in the string connecting the masses?

  14.13: Which one of the following scien c/*7p bl *p* keuyq- d2lk53;csgsulltists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to tp3*l-2yplbu5es*sgldq uc* c k ; k/7lhe displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted* hajpiv2dodsi h2.( : at an angle of ojdidi2*(h2svp h :. a$\theta$. 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 wpg-c p0wn-xh(pu1r/yp , m z6pooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Whiz-mp0p6cpuxph p(,r 1 w/n- gych of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In which case.r:8snou/dxb is the string d /u8.orxsnb:most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and thesm g1zin)x.,vi6t7oq6 m bw ,x strings holding them in place are identical. In which case woulgv ,xi6)im71qs zx,o.6 mw btnd the string be most likely to break?

  16.10: A person wishes to acc 1ymli ub;.k1xelerate an object upward uniformly. Which one of the following choices must be true of the forc;k ibu x1ly1m.e F, provided by the person 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 along the x-axis*q5 ltku*a jit,dd87fh6* dbe, at one instant of time, the mass has p j57 *86*ltbqkt*f de udai,dhosition 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 re * -i/kz5 d *rbphsd (r5n4i5vlgzl/cight on a rough surface by a horizontal force of 15 N as shown, during the pz iprikz4 5c d ndrbvlg*h-55/se*(l/ush, 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 is sliding to the righw/ new j)/efc7yj.1ag a+-w5vl9nk ift along the floor. A horizontal force of 10.0 N is being applied to the right. 5c+ wnewl a/1jg 9ae- j.ny7fvwf)k /iThe 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 a8sa 9 r*a jq6 rc+yrqv:b1scoq(r41gkngle 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 dwl98+ fe1ijvn d7u3r steel plate as shown in the diagr1e+in d8vwjf37ud l9ram 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 anglwhkii//gq3 9 he θ with the horizontal. The block remains at rest hi3g/kiw9q h/ as 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 ab+1 (i hwqw0+p e+ri*vzv d2qx 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 planebq 3p2y.pd+fp* *fbi w (where friction 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 planei.2 *3dp*pywbqfp +fb?

  08.08: An object on an inclined plan 9vmtnqy:hr ff15k9b(v:dt, se has a gravitational force of magnitude N 10 acting on it d5,sqf(h::trtkm9v 91 y fbvn 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 to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant glnmd a+; , )i1ma sch4-e v9gv24ooa l)gtab4speed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction fori aa;g44,l )edc1a a4nsh bmot)o vg2 -9m+lgvce 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 constanmoywsvp-yq(:i.6 cx rz6a 00a6 a/xb+ni(oxxt speed of 5.0 m/s straight up a flat surface inm( -x.ax0wc6 6x :xs ay+nroy b(0qz/ii6apvoclined $30^{\circ}$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 o;rn/ hlr0 j aluidphf:40a 1v7n 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 stp;u01 nj7har/li :l4fhvd0 raatic 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 the top of a frictionlesx(2cz:davi,/ pss j )ss incline. Thez/ s2(p )xiacv,sd:s j 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?