07.10: Contact forces are examples of which of the f mtc( +.ijf8qcundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the o 89 knrhqr2de4thers?

  02.20: The graph shows the relationship between the mass of a number of rubb (y;kn.fzue;ber stoppers and their resulting weight on some far-off planet. The slope en; .f;z(kbu yof the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table.pyb8bl qwc96pdayx p /2 s2;0b The magnitude of the gravitational force on each block wbqy262;yl pxs/d ab8 0c pp9bis 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 a93zox8 nxyq(4o0xdfk classroom ceiling by a series of strings as shown in the figure. Which string has the greatest ten9fnz o(3xk o04y8xqdx sion?

  16.05: In the figure shj8 hd(sn7hf n-own, the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices repres8 n(-hh7fnjds ents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated with the fol,z1(fyh95bduo keeq -go ; f4o3*rr jplowing statement: “For small displacements of an object from equilibrium, there is a restezq4h-o1dyr,pb 9*ef(g r j o ku5;3fooring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure,zf;t (f lna7*rw sxzc))g1cj(gop 7k+ a force F is exerted at an angle of g fg (c(sn1at;kolwr7*z )x7)+pjzcf $\theta$. 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 horizontal floor at cpf-r nuhc sz4*0gg-l :onstant speed by means of a force P as hugng0f*: 4-- rlcpsz shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In whics7wct0o7c z(lh case is the string most likely to br l0s7w(cz7o tceak?

  96.39: Assume the objects in the following diagrams .f2e 0lyhvm):wi3 dmahave equal mass and the strings3 .l 0)dmw2:y maivhfe holding them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward unifk1d jiub/7;w d*ykmgyc.x 1x2ormly. Which one of the following choices must be kcy1d12k bu;y 7 mx/.wd*ixgj 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 the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis;yp mt8g m w-;9,qmvub, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,w-vm9 u qby8m; g,tp;mand 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 by a horizontaey4i wk11u dytc-9db)l force of 15 N as shown, during the push, the object accelerates uniformly to the right -1tw4y1uy b9k cided)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 isf*cq4 ef0m. 7 m(elfga sliding to the right along the floor. A horizontal force of 10.0qe7e0ag.m 4 fm(fc*fl 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)g v ivst:i pn1k3jw: 1o4w;cj 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 fh rl5xys :2oenh+c:vk*9b1g is first pulled across a horizontal steel plate as shown in the diagramf+rb9 ykno5hse 2x:* g1vh: cl 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 m- 2mss iq9emz 79h(rhqakes the angle θ with the horizontal. The block remains at rest as θ is slowly incr- s 9(rq7mhem9isqhz2 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):v x1oxp5:pdcf ,*0bxij vhp 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 (wh) p psdq2is1x6ere friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of fricx6s1q)spd 2iption between the block and the second inclined plane?

  08.08: An object on an inclined plane h 1(qhi:*iltb* oalck(as 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 shb(*hoicla:q t*i (l1kown 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 p2a nz.i;r3ov lrzmr1,ushed 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. Which one of the following choices ra3o v zr2zirnr;,m.1l epresents correct relationships between

  08.20: A person pushes a block of mas5(3 szp n3 pz-*hpog:z8rgznms M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclinezgn *:p33 r-sz 8z5pghpo (zmnd $30^{\circ}$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 o h8w/hv lc av2/nzf:2qf mass 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 thew:vvn 2qa hcz/2 fhl8/ mass,m, of the block?

  17.40: A small object of mass M is released from rest at the 3nx mma1ra lx4w+v ;2ctop of a frictionless incline. Tha r3v;mlwn24+1 am xcxe 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?