07.10: Contact forces are examples of which of3c3 l vu5t.k4oot /wox the fundamental forces?

  99.02: Which of the following terms is NOg(-t,; q,nzbq 7ber,rn x9t1 t+i + e0dwddmuhT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a f w muycc krd6a1s710(c,x0r fnumber of rubber stoppers and their resulting weight on 7 01(yxfcw, fcr61kacmd0usr some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remai9nhktnpa5:+ l n 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 block5p:n+l t 9ahnk B?

  14.04: Three equal masses are suspe * nhn7vucflvd*,. dg5nded from a classroom ceiling by a series of strings as shown in the figure. Which string has the greatest *.u ,fcgdv5lvnh7dn* tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14. ccj;cbckiq )f*g,z .40 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string cccczfik,g 4;b).q c* jonnecting the masses?

  14.13: Which one of y foseq/325ok2l p8u kthe following scientists is most associated with the following statement: “For small displacements of an object from equilibrium,fk eu8 /sy3q2look2 5p there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F9 wq6 h7arxswxxp) besd0r4. 9 is exerted at an angle of 7 w.pe9xrw h)09qdxa6sx4 sbr $\theta$. 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 .yntan4 f)t.jhorizontal floor at constant speed by means of a ytnjaf4t n. ).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. p n+*di 6eg9/j1bws fyq1+fjgcmoq0hl er(29 In which case is the string most likely to brerf6 qwj+2eeg11lcgb fjdy( somhipq*/+n9 90ak?

  96.39: Assume the objects in the following diagrams h 4:x.h cqjzxs:ave equal mass and the stringsz:hcxq sx .4j: 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 uniforml*/ rliczn5 o5ly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represe 5r5 nlco*i/zlnts 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(s;ir;fr( zl.xo wn xum6 yg97-axis, at one instant of time, the mass has position 2.0 m, vel.ni z g6omx;fu(97 r(lrsywx;ocity 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 gmn* ici-*rw/pushed to the right on a rough surface by a horizontal force of 15 N as shown, during the pushc/i m *gin*-rw, 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 is5a+s: f. /cc -jgtixhe 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 bos-t:.i a/e5jf h g+ccxx and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane incl8i gg:dv x7/plined 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 across a horh *di7p(3d cwuizontal steel plate as shown in the diawp u*dci(37dh gram 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 horfmv/v4 h zyg3)7 oln+lizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force ofn4l hg)m7 y+flvz/v3o the incline on the block

  01.11: A 5 kg block y-tk hw8dqq l)50rxp 2uph+;sfkqd- ),cdxz2rests 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 placed on a4 yva+-mou6re 5vo8zo 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 fric6vo a 4evor+uoz-8ym5tion between the block and the second inclined plane?

  08.08: An object on an inclined pl-m bf *vr fcflz9+e5hs de3-w5 kse;,lane has 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 shown in the figure? The y-axis is perpendicular tof5 l whmbcs,dkvefer3es z ;*5-lf-9+ the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is beirb 6 afd.4-nwrl,8dfi2 bu 9htng pushed 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 fora 6bnrw9fiuh,r4l2 f td8-b d.ce with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block f1ixvh2hg b)k7h m*- nof mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat suxbh nvg)fk -27h*i m1hrface 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 obuu,eagqu; s,f)o6 y t2 jg/g5f mass misplaced on an inclined plane of angle θ . When released, the block does not move. It is determined thats,2 b; ugj6)a uy/5geqtf ,guo 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 the mass,m, of the block?

  17.40: A small object of mass M is released from r7k7e,1;4(qomoidykxz9 qeb hest 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 slq4,;b97 oemixkkdz yoq (e71hide, what is the magnitude of the normal force from the table on the incline?