07.10: Contact forces are t8wk k-:t b,5w*1iju)nmtkylexamples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to th( 2 k*vvrz5lpoptuih)rk 1 11we others?

  02.20: The graph shows the relationship between the massqee4i7 )nck *l3g/bz e of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a repres3lec 4i k gq/*nz)ebe7entation of the:

  10.15: Three blocks, labeled A,B, and C, remain at z3b:y w1jii21 y hu08ct ny6ru -9blqfrest on a table. The magnitude of the gravitational force on each block is 1u 2bychliu6 039nybtfiz1rj: wy -8qindicated 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 ceiliw mb1 vox(,;eing by a series of strings as shown inwve x 1omb(;i, the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 7jp3*o xyiln. k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the si x.7jln*3op ytring connecting the masses?

  14.13: Which one of the following scientists is most associated with the fv18ln(bh0p ,7tz sgkiy/7exr* hrj7 1yt zi 7jollowing statement: “For small displacements of an object from equilibrium, there is a restoring force that ishl7 pzti*k/ 707, 87gnz1 v1rrjhysixb(e jyt proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a fm06 twcrk/u 7ge f 2k6yzebp9.orce F is exerted at an angle of p uyt6 7fb kerw2gcme60k9/z.$\theta$. 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 woodent j 2lj e)hd2aqq9sz50 box along a rough horizontal floor at constant speed by m52h 9t)qdz0q 2esjajl eans of a force P as 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. qw r v1:ox 3b(s8qg,yf In which case is the sb gqvyr81qfw: 3,o(s xtring most likely to break?

  96.39: Assume the objects in the following diagrams have equal +yg 0s8wwefnxor2 3 h3mass and the strings holding them in p30wygxon2 s w8 he+3rflace are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upwaritj /c3tyh7. 4pow1h*nhb c3xrd 2n7ad 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 gravit/w*t 1ohpa 3hccrb4 yj7n i2n.t7xh3dational 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- ic7o)2 vo+aegc)5c )v goro3eaxis, at one instant of time, the mass has position 2.0 m,ce)+vg ro ov2ce3 icao7o5 )g) 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 by a horizontas-tc2)h u.*7p1 ahghgsp e-e+oh6po ql force of 15 N as *gp)7goh+qsp2e16hah tphsoce --.ushown, 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 the righ gqa (nbe5fr09t along the floor. A 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. The05nb9q (eafr g box is moving with:

  00.32: A block rests on a flat plane inclined at an an1 mn1jm hslso(g x(+x )f-bvr6gle 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 acroslk(wuv/uu a4g/,6 zjcs a horizontal steel plate as shown in theaug4,uu/wkvcz( j/l6 diagram 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 angle θ with the horizontaq j/vysb1- g/cl. The block remains at rest as θ is slowly increased. The magnitudes of the normal f/ qcb/ sg1j-vyorce and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plah9rt b auu,mw*3m0j9ane 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 secon gp2dkq8)oi(ua .fr m2d 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 frictionrai.8m2 g2pf(oudk )q between the block and the second inclined plane?

  08.08: An object on an inclined plane has au4h4 /bzv f.tr gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct /bt f4u hv.z4rcomponents 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 pushwi 7eyeb 4bdr,a4z/g v9wu7y 9ed 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 g,d7ire/by9zwu97 ew4y4vb a following choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed ofp u;t1*xlbsb3 5.0 m/s straight up a flat sub3pux;sb* l 1trface 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 misplaceyq4mqft 1qp) haa o,/)d 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 st oq)yf ) ahp,m4/qtaq1atic 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 fryvhe2v.mb1e4u 5,kclv0 x(hr ictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a tabl4hcvk(vh0,l ryu1.2e vex5m be as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?