07.10: Contact forces are examples of which of the fund4g1 f )p+xrqxgamental forces?

  99.02: Which of the following terms is NOT related conceptually to the other* 17/mniuvs tl 9vdgb4s?

  02.20: The graph shows the relationship between thfm6w ,:3.s xex (j 2lhyopqco2e mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the grqw:osy .6 ,e 2hml fp(c23oxjxaph is a representation of the:

  10.15: Three blocks, labeled A,B, yt5):v2-oc jyrx 1p tdand C, remain at rest on a table. The magnitude of the gravitational force on each block iyptj -vd5ro)x2 ty1c :s 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 ceiling byjmv 5+tjm;y *k a series of strings as shotj +*5j kymm;vwn in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the m omsv6uoclz hwcfa01s tibt+ i19) *.2ass M = 14.0 k。are stationary. The mass M rests on the floortt*c)h om 1s 21lu+.s i0 icvbw9z6oaf. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is mos.0 gv2lv f7( a(ehburst associated with the following statement: “For small displacemelbser 2(h.u 7a( vvgf0nts of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in theb )rc14gljv19j m2 huj accompanying figure, a force F is exerted at an angle of u mjhrgl1j2cj)vb4 91$\theta$. 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 woodece go8*oz+e a1 p;/ppzn box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the followin8gpe/c*a +1 poezo;z pg must be true?

  99.08: A weight can be hung in any tj2ic 68c *d y5u3qw26 esy s; jyz;go.i*baydof the following four ways. In which case is the string most likely to dy ys6aoz6y 2bsq5*.j2w8d*yji gc eitu3c ; ;break?

  96.39: Assume the objects in the following diagrams have equal mas nxd/kz48kw/ss and the strings holding them in place are identical. In which case would the string be most l 8nwsxk4dkz// ikely to break?

  16.10: A person wishes to accelerate an object upward u-zhe1lge fz bm;x tv7e1j5s54niformly. 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 1eh;ee-7zv45z 15tjfsxlm bgforce 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, at one instant of time, the massod9 ,jf;-l tpr has position 2.0 m, velocity 3.0 mor,; jf9tpl-d/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 by a horizv6*oy5 lxpwl2 z7wei0ontal wz7 y6w*20vile5 xlop force of 15 N as shown, during the push, 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 thb-29 l,tbj bvze right along the floor. b2vlb-, btjz9A horizontal 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 at an wflj n.*nb : l-2v fc4bl-ey(8.ojbsjangle 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 steel plate as show su2) pz9cvsmlggj8. 3t9wb6tn in the diagv2 9 gtscl)t.jw8 6bu3gmpz9sram 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 makud bc,arhi*oavm t23.(zf0f . es 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 u . oih,v 2(a0d. mt*frz3cfbafrictional force of the incline on the block

  01.11: A 5 kg block resa .sqw0 g6nme6 px*5c c0x2 z(v0dhzetts on a 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,.xgxp ysdci1lv6g:7 icg/p7 placed on a second plane (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 plane6 c: 7/diipgvx 17.ypglsgxc ,?

  08.08: An object on an inclined plane has a g/ hi:*jhb m,-o n qa 3fhd1g-vqlkna41ravitational force of magnitude N 10 acting on it from the Earth. Which anqd-:hjhq *g k13-amov, i h4lf1nb/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 puskz.,hp j+3v +s1uohxg hed 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 o+ svzhk j,.uh+g13pxof the following choices represents correct relationships between

  08.20: A person pushes a block of mass M 7iu3m 5k1 ms1wjp7nnf=6.0 kg with a constant speed of 5.0 m/s straight up a flat 1uj ifp ks3 wn77nmm15surface 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 inclined plane of anjk0nja( l+*tygle 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 (a jyl0j*+k ntbest represents the mass,m, of the block?

  17.40: A small object m j tkbe8tetw-(3-t7g of mass 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. The incline remains at reston a table as thesmall object slides. During the slide, wgbtk-3e(tw-e 8mt t7jhat is the magnitude of the normal force from the table on the incline?