07.10: Contact forces are examples of which of the funtt :zru;uxiu )um,+e6damental forces?

  99.02: Which of the following terms is NOT related conceptually ujk1g5y-b10 fxzf sli4-dk ;mto the others?

  02.20: The graph shows the relationshipr;wbc*cu:e 7sv/ 4tj*+e uye x between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation of uc*x u+s*; :vrybtwcej4/ee7the:

  10.15: Three blocks, labeled A,B, and C, r8 9af why(cy0memain at rest on a table. The magnitude of the gravitational force on each block is ind0 cy98mfa (hywicated 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 ae ,f967fq yi)jkjl syov38jo6 classroom ceiling by a series of stringqf9 ook66yl,ij)7yf j3 sj 8ves as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。arez/fi hzz8b ,+w stationary. The mass M rests on the floor. Which one of the following choices rf8i +z,/hzwb zepresents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most a9obs9xg:x0-wu+e(z:p q 6ikiwx6gf jssociated with the following statement: “For small displacements of an object froxgsj9qepux 9(of+:-gzb wwi60x6 : ik m equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the acc)vc :uk i ce-1pz+zp/j+y-g .j xl-btsompanying figure, a force F is exerted at an angle of p z-s zcvbj-p:l++-ixguketjc /1y ).$\theta$. 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 horizomx904 o/opj 39hiqat41epnu rntal floor at constant speed by means of a force P as shown to the right. Which of the fol 3h/nj04o9apmxe4ip 91oqu trlowing must be true?

  99.08: A weight can be hung in any of the following four ways. In which6onmxqy6uir )ro. (*esi es74 case is the string most likely to brea)ire6erum76i sy( .xo4*qso nk?

  96.39: Assume the objects in the follo ne:6af )ihnw e*ow1*qwing diagrams have equal mass and the strings holding them in place )wn6h1o*a:e finw*qe are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Whic6 qq bw6yycj2;m w9tb)h one of the following choices must be true of the force F, provided by the person onto the object? W representw b q)tw6qbyc;y6mj2 9s 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 movt .zz-+tch:efto(: e1,z- .qfguu ckves along the x-axis, at one instant of time, the mass has position 2.0 m, velocity 3z.t- cu+1o. zuhvqeg : t(ez,k cf:t-f.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 they2zv l7oduz0fwin,q0cu09u5 right on a rough surface by a horizontal force of 15 N as shown, during the push,q 0n,uul7fz0z5wcd u0i2vy 9o 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 figur,)m-2au j.:q xoc 5odt1i tcine to the right is sliding to the right along the floor. A horizontal force m ti,oxtnc:q1. 2-diuc)ao j5 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 o ,oj 80:onxjmzusry5 ux225i mn a flat plane inclined 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 iyofu uw22itib9n)u fw1jl67nh gz sk y,430 o0s first pulled across a horizontal steel plate as shown in the diagrao s1g)zul973 0u yhu,2f jitn w0noi26 4wybkfm 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-d w pznuk() r5dg-qg1 makes 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 incline on t-k zwg u(1pd)5ngr d-qhe block

  01.11: A 5 kg block rests on a flat plane insp i1whmdv(r/7hb /y: clined 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 is h 8h,zit,vwn8significant) in inclined at the sai8vthh,wnz8 , me 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 inclg,qriexp6 0e z0p8t k0ined plane has a gravitational force of magnitude N 10 acting on it ft8e0 pze,0x0 rk igqp6rom 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 ah8h 8z uli1hy6t 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 f8ul6 1z8 yhhhi, 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 pushero dp 9l9.n9:z a*bb/ff ,lqdqs a block of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat supalz9 dr,fl q9q9f n.bobd*:/rface 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 mas/tu:-/lnr5z :ouw36l pg2atmg * m8 qn0 qagjrs 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 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 th2u6 nm *nj -mg8glq :r5ar0w 3uotaqtzl:/gp/e block?

  17.40: A small object of mx+7)vk dpo 7*kk.tmhcass M is released from rest at the top of a frictionless incline. The inclinehas a mass M and makesk.od*7c mxt +hkpkv7) 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?