07.10: Contact forces are examples of which of *;9wi:p*1jflj5tx(szgv. xw z/aft q (obz9 fthe fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to ey tvs vp/9. uz*8cv6h.r zx2mthe others?

  02.20: The graph shows the relationship between the ma1 etq)j09mgptyzx 4 z+ss of a number of rubber stoppers and their resulting weig4xyzzg1j) m q+0tte9p ht on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remainwu (9 5axsui2a wt9l4u,qvugo*1iov. at rest on a table. The magnitude of the gravitational force on each block is indicated on theu it*uvo42i5wla9sg,o9auu(. w 1q xv figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a c xg vy76fmm6y(lassroom ceiling by a series of strings as shown in the figure. Which string has the gre7(6xym6 mgfvyatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14h7o9aah, qs7m/ z eqb:.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the masses?s qh a,7oha/z:mb 9e7q

  14.13: Which one of the following scientists is most assoc4gt;r66l, oy sfhu:sgoz 8b -diated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacb;- o6gz8s4 gf stlyrd uo6,h:ement.”?

  94.26: As shown in the accompanying figbc ck/r2 tjn83ure, a force F is exerted at an angle of krbn2t3c/j8c $\theta$. 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 alony/e dyb4.qrw4 g a rough horizontal floor at constant speed by means of a w4bqy. 4/ryd eforce 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. grv ,-se ffd*/fu/fa(2ip(3iw x)bsr In which case is iu d(fpxe 3/s2a,fr-w/is gr (fvb)f *the string most likely to break?

  96.39: Assume the objects in the f,)r ipa7emi ueb-u+d +ollowing diagrams have equal mass and the strings holding them in place are identical. In whice+u ru,)+abe dm7i -iph case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Whin,jy: h qft7a c9c9p.tx6a7a ich 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 of the air or of thtptc 9af79axcan.7 yi q 6j,:he Earth’srotation.

  11.12: A 5.0 kg mass mo u r;10r3ilr(7gqsr0xzko1 );blrd h vves along the x-axis, at one instant of time, the mass has position 2.0 m, velocity3r 0u0ril;ok1b)r1hrq (zlx rv7 ;sgd 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 ,g0j( q 4 gbb;xa ug9b,oyar se4:kj,wa rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly tqg0(4,b xa,ubg:;4 ek ,9wjoysjbar go 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 slidkvor3 wb8:td z2qjo/ mq0134urxby 2ming 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 0k :/3wr1b ojm v8bmq2ud34oxyzqtr 2 the box and the floor is 0.20. The box is moving with:

  00.32: A block rests onbb. ps070y7f x1azjal 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 across a horizontal steel pla 7hu/0 iyd/ktxte as shown in the diagram/t70k h/idy ux 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 wit5wjc4rerjtk j7+v0 :a1tmhpi -8xn8s h the horizontal. The block remains at rest as θ 4-k we8 cj0: t jmixjs8 n71r+p5rahtv 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 plane inclined2h9:ahdmi 6zp 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)d.su2py4y*ow8 w3tr ewecs+ 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 inclinp+*w rd4)c 8ewys 3w2otusye .ed plane?

  08.08: An object on an inclined plane has a gravitat*w a a8gax05u)xpl em6ional force of magnitude N 10 ealxm6 a5u*xagpw 0 8)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 to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is b2 3dux/ct :0q95 3uo vqwgb;odww0jydeing 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 force with the surface by n. Which one of the follo9wv/oq 2wxu;0t c:dg33jyquowb d5d0wing choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constancxt1 k*fl-i(x t speed of 5.0 m/s straight up a flatltcf-1 i x*xk( surface 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 mai3w,w+ht0 cu zv7ten)ss misplaced 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 static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the bloc,ww) uivhz3cne +07ttk 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 masuwegcb-n,smb xt76rgu2nq+fj -m/,1 u.ki) ds M is released from rest at the top of a frictionless incline. gt1 e bn-uw2j).qkb-x 7muscg6, ,dimnu /fr+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 magnitude of the normal force from the table on the incline?