07.10: Contact forces are examples of which of thei 1nbx,.+ 7thwqzz/vhgk (,s r fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the f en u-yz w5 5hpc6vfr*/gi.l(others?

  02.20: The graph shows the relationship between thegzh0 z(a za (p/pmgx)o 65xo6a mass of a number of rubber stoppers and their resulting weigz( (x/poxag)h056azpza mo g6ht on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The5nvnr1a+op cl* 2xb (r magnitude of thr( x5 2opr cvalnb1n*+e gravitational force 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 classroom ceiling by a series )tf3-hv ol)y s2k-t* osyumi;of strings asyy-tfk2so* t h);3vou l -im)s 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。are st7o or4tct+j5 l5c 6hyvationary. The mass M rests on the floor. Whiohl+oyrcct4575 tvj 6ch one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the follor(sr :q*f5g f0al 2yxowing scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoo rs*:0xq(agrl 2fyf5ring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exh e(w9+ jor(a *o9pztperted at an angle of z9(wp hprj+9( aot*oe$\theta$. 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 alo9 qk4) 2mrm nqjpx-+scq9k(sv ng a rough horizontal floor at constant speed by means of a force P as shown tocs ms vj)-kqpq9r+qm2n(9k4 x the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following8m8zwpsuvz o z;fq+ () four ways. In which case is the striqp(z8mz+v 8wzou )s;fng most likely to break?

  96.39: Assume the obj,p f (av8na,*evojgln +sj,a(ects in the following diagrams have equal mass and the strings holding themj sv+a8(a o g,( ,*jvn,enfpla in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes8rrttyd xwa 9c7: /v7z to accelerate an object upward uniformly. Which one of the following choices must be true of the force F, provided by the perso9d778 x/: cz vryrtwatn 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, at)qux5a+qdw:bsec jkxf oo w v:a7a5 2q6lf, (5 one instant of time, the mass has position 2.0 m, velocity 3.0 m/wvqfa :7a lq k65a2 q:+j)x eobso(cdf5 5wu,xs,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 objef- jaa mukn0/wu 7)at9ct is pushed to the right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates utu) -9kwau j70mnfaa/ niformly 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 bow a f38ep0utj,x shown in the figure to the right is sliding to the right 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. The box is ,ajf e pw3ut08moving with:

  00.32: A block rests o tfg73 w)- 5(lccpgxxtn 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 is first pulled acro;;3q .d pnegigd)u ,qwv 1k pltk/s4+bss a horizontal steel plate as shown in the diagram A.pukqn 1.bq l3 + ;4vd) wkge/i,ps;dtg
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( r3gp5k *cgmi8.ktjl, ai7zx incline that makes the angle θ with the horizontal. The block remains at rest as θkk x7a,imlrij5cggz(38t * .p 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 a flat planilyyg* r ;7ovqyi y200 dh6d4le 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 (where friction6*n5 mni1zt:i* ywci a is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the for 1nai*ni *t: 65mwcyizce of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitat8hbds +9 op2a)qp s)3ac stel(yuj;x3ional force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct componcsus+pt) 9js3lha;8)3ebpdo a2(y q xents 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 speed o+u u4tp2yco8 l6ww:c ah.7bx en 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 Fhu+ yb7xwc4uo w.ec 2 :l6pta8, 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 kj2 -mig6zptixs9 ug:xdwj /:;g with a constant speed of 5.0 m/s straight up a flat surface incliijwmt;/d-: x 6guxj:s2ipg9z ned $30^{\circ}$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 anit;kl4i ;wse l(jrb4z4ow) izgg*ru1aq8: 5 g 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. 14ebi4l g5zi u:a;* kr(8w i;tg)w gsqjoz4lr Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is released frozv.x4fes7yu 3 lxx2mu6:cx .nn bawf o+,tu+*m 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, what is the magnitux3m c. +bunfz.xx u,u*y lxsa6f4n oetw:2+7 vde of the normal force from the table on the incline?