07.10: Contact forces are examples oq)sj 4 ry9i5 r)jl0fygf which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the 1uup ) cld+so ezv;,8wothers?

  02.20: The graph shows the relationshivxgfhr.7 1 (zap between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the gah7z(fxr g1v.raph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at r;b,v fme/a ny s6m2r9o-3e fzy(v)cyvest on a table. The magnitude of the gravitational force on each block isve);r26 v vy,3yf9 -cmbe(/yf zsamno indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masse; m+5 5y+z4hirsjmiqr3fl 1dhs are suspended from a classroom ceiling by a series of strings as shown in the figure. Which string has the greatesz3rl4 i5di yhm+q ms;15+jfrht tension?

  16.05: In the figure shown, the mq )g 2uux. ufwf(*(.v ek/qnjcass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which onefueq)u /nqcufj.vk*(w 2g .( x of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the t7 roftc *8pj/following scientists is most associated with the following statement: “For small displacements of an objectp* /tfrotjc78 from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying fv2 .cuqiv,wfpj 9.lu( igure, a force F is exerted at an angle of . qfuvplv.i9 cw2, ju($\theta$. 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 horizontal floor at constz8ewx0q2h/a: w vcl:app6 05wt yhn,d ant speed by means of a force P as shown to the right. Which of the26p0np wx:halv/t :ecw 8w 5,ayz dhq0 following must be true?

  99.08: A weight can be hung in any of the following fovc4bfss8a5*.3n5 wrsc p dko7 ur ways. In which case is the string most likely to break? *rfdan3 5swos4bkp7vc 8c 5.s

  96.39: Assume the objects 4t o+)k,pooke in the following diagrams have equal mass and the strings holding them in place are identical. In which case would the string be most likely to brea)to,k4k+poo e k?

  16.10: A person wishes to accelerate an object upwot27 lnkti)nwi- h9a/ ard 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 gravitational force acting on the object. Ignore any effects of the a-iotwka/) inn9t h27 lir or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis,slk;p6 d43k wo at one instant of time, the mass has position 2.0 m, velocity 3.0 mpw6 l;ko 43dsk/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 rightlg 0)o,w/(8wqxk msr q on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerateqo r,x/w8g)q(w s k0mls 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 tujcu)ux, ai+rmw,0v uk 2tk1*he 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 kinetk *icurk0 1ju+uxamw t2u,,v)ic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane in 4 ur+rw2 1s*z efa;qs2rklr3hclined 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 acrossli kijl5tqeu6:8, c2z a horizontal steel plate as shown in the 6c ei: z2ijkl, u8lq5tdiagram 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 ya voe( /7x3ble *fncqwj)-+4a/o ckn θ with the horizontal. The block remains at resen)73/ ac c/eqxooly+a*-vfb j (k4wnt as θ 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 incf.c-w0fk( lftav* 8a /4gmn jolined 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 fi )l-lam4z p4yriction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What a4pim-ll)z 4yis the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of6x2hh, zatjn8 micz+8o /:yhb magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axesz ahho82zc:mb+/,y ihtj 86 xn 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 / o:bmrv+mpzhzhai8u2:4 0bpnv,df. pushed at constant speed on an inclined plane. The free body diagram of the object is shown wu4hz,:+.fnvobr2h zm0v8 bi /p adp :mith 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 following choices represents correct relationships between

  08.20: A person pushes a block of mass .,v40( rhn axatc8tyhM=6.0 kg with a constant speed of 5.0 m/s straight up a flat surfach8 c.vt(n ayx 4,0harte 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 misplace cplo0qpir/ 2vbbt*87d on an inclined plane of angle θ . When released, the block does not move. It /8l p cibv2obqp7t*0r 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. 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 restwzxbz5q* qksy.ez-3sc); y0 q at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The zz5bxy 0)3 ;ezq ysswk*cqq-.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?