07.10: Contact forces are examples of which of the fundamen91e 4urqxl/imxt k4u vdji u):+.)krs tal forces?

  99.02: Which of the following terms is NOT related conceptuaqgi)8l zk- c7, fu0xnolly to the others?

  02.20: The graph shows the relationship between t,0vkr..oiwab u tp g.:he mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope wok,i0a.v:.ub .g r tpof the graph is a representation of the:

  10.15: Three blocks, labeled A,-ge o7sk g/k fd y2zd47cou)/zB, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C from block dsok z7 g/ )g- /4duz27ckfoeyB?

  14.04: Three equal masses are suspended from a classroom ceiling byt r 86wciwn2. fqc jfqt885hh/ a series of strings as shown in the figure. Which string6/t 8qwi88hhcf rw5. q2fjtn c has the greatest tension?

  16.05: In the figure shown, the mass m = 6ao tdj287v yu 5l3dk*r.0 k。and the mass M = 14.0 k。are stationary. larj3 8du *v2kd o7yt5The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated with the fobo2huy6umrz b/5 ;cpbvr6z; pq+ q84 kllowing statement: “For small displacements of an object from equilibrium, there is a restoring fop+ch4kvub b;yu/6zq8 5br ;q6 mroz2prce that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at anuu8yexo9/k zlc 45u)b angle of kx / lu5o)8uy e9ub4cz$\theta$. 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 wo 2p h lxr+2xkvo.7bu:pkv/r(t2e6kunoden box along a rough horizontal floor at constant speed by means6tv xk r2nvu/7r oh.uxk:p b+22el( pk 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 followingp9jr0c;n++o6rbh he c,c l(m r four ways. In which case is b+crrmre,pc(c+j;hl 6 9ho0 nthe string most likely to break?

  96.39: Assume the objects in the following+*gagjod0 p i- diagrams have equal mass and the strings holding them in place are identical. In which case would the string bejoia+0 p*gg d- most likely to break?

  16.10: A person wishes to accelerate an object upward uniformlf(lxi 7oe- u-py. 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 force acting on the object. Ignore any effects oliuxfe( o--7p f the air or of the Earth’srotation.

  11.12: A 5.0 kg mass move/wg 51 g*gqmdks along the x-axis, at one instant of time, the mass has position 2.0 m,wd/5kgg1gm q* 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 horizo*9v v k.ou3mqa j: m+5(cle2 ovqnur*pntal f r.opq*c9 35mo uv(juqenva vk+ml*2:orce 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 the rh94 cpqtg) 5a8+ sotnpight alon +4tnsago)hp qp895tcg 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 moving with:

  00.32: A block rests on a flat plane inclined at an a -fylqu3n3zyj;qs p5q5 ug72 tngle 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 shown ni +7 jn7i0aqmrip (ck36iq) jin the diagram pjma ( c6n037qnrqi ikji7 +i)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 theij w 5 g((grl2jd:d lpw89fz(n angle θ with the horizontal. The block remains at rest as θ is slowly increased. Thegil gjw9l5wz :8 fn2 dr(dp(j( 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 f:(or qkvybxu 7 : x,-ci6xtyeel95.kglat 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 placed on abl/mowff21jn) 9 t8ymdf il/5 second plane (where friction is significant) in inclined at the same angle8 windyb1/ mf25ft/m) lfl9j o, 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 inclined plane has a gravitational force of magnu-tky (pb . gj6opt4w5itude N 10 acting on it from the Earth. Which of the following gives the 4 j-wo5. yp(6tkubptg 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 at constant speed on an inclined plane. Th4 f2:l :koxkxre 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 followklrxok 2:x :f4ing choices represents correct relationships between

  08.20: A person pushes a block of mass yw jd/cq3h o189vb+xfM=6.0 kg with a constant speed of 5.0 m/s straight up a flat sur1f/bq3wd9j+xy oc 8 vhface 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 inclq surpcb30,/x0pcol / v5r9n 4 cyst25nnkb2xined 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 coefficr20vnukb53 ,c csxstl /490qxnny/5 bpcr2 op ient 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;n+6-fnvsjws from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the hov +nsf; njsw-6rizontal. 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?