07.10: Contact forces are examples of which of the fundamental forces? 2)tnev a :zc6iw);0ipyq:lez

  99.02: Which of the following terms is NOT related conceptually to the othev6t w u1d1)dp* m*isfbrs?

  02.20: The graph shows the relationship between the mass of a number of rubbes*3:yx)rc7 sboal0 br r stoppers and their resxacl3r):s y bro7bs* 0ulting weight 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. The m5ohhx-g 8 k5zrr.v* faagnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of theazh 5o f*8r-x5h.vr gk contact force on block C from block B?

  14.04: Three equal masses are suahd rmj;*ws tg;m1. u+spended from a classroom ceiling by a series of strings as shown in the figure. Which string has the ghst.;g wmujrm ;a1*+dreatest tension?

  16.05: In the figure shown,fj cl qewlu yrj5 9j+.u/(/8mn the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the m9j5lu/q+ce lu .jnf(rjw /8yfloor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists fpf k t (3t:rkg c 4tsk3h-9nxtzp;3rdag t3/5is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force / 3htr a9f :3-ttksrdkzg3c 4p ;npx5gtfk3(tthat is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at andb5*zbwq ,(c g angle of wbgb c(qzd,5*$\theta$. 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 alv6.yt i zign/ug 4cxn1t36bg1 ong a rough horizontal floor at constant speed by means 6ig3/ygngcv n61 i.4btt x1zu 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 fojkwlx))hh)t1 llowing four ways. In which case is the string1h)wt jxkl))h most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and t)0z grr:ot q*fhe strings holding them in place are identicaqz )ot*f:0r grl. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upwardwu +nq/42wrcbh9j fc7 uniformly. Which one of the following choices mustnq+wfb2/4c 9jhc urw7 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 the Earth’srotation.

  11.12: A 5.0 kg mass moves alongmf :t+o h p*yq(jh2jg+ the x-axis, at one instant of time, the mass has position 2.0 m, velocitygo:hpjh+ft(myjq 2 * + 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 rou nmb-+fg ovi:a8vb34ogh surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the righ4n:g of v 8boivm-3+bat 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 show b:zwo g+h7p:vn 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 coefficzob pwv7h +:g:ient 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 injy yq7;65bfyo tq)hr: f *trm2clined 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 horizontaltk n 7ppl, 11m/e:sjia steel plate as shown in the diagraki l,ep7jpa /t1n:ms 1m 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 a2a1c+xcm+ e fmqk6bn 8+dn5fan incline that makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static fri+a 2f8+xn5qd mmec16 cb ak+fnctional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane h g(l(wm5u1 q7, s0qjzxuhnu9 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 secoiu+yy p s96-nnnd plane (where friction is significant) in inclined at the same angy6 pnys9nu+-ile, 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 hajp8onu (p hjy kuh)2:,s a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct componenkpu ojph2u:(hny,)8 jts 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 in( z 5qulh ajki(jlpr .4-50cyqclined 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 following choices represents corre5(ll(jp 0 zkh5.rquy qcj -4aict relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant spee* n2)yxd-vgaw d of 5.0 m/s straight up a fl -vdga wyn2*x)at 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 mass misplaced on an qu1bavt112 9 tsfpnj7 d*jpi: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 fr1s dnu b29afj1pt1 tq:ij7v*p iction 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 rest at the top of a5gkwn zev,qw437cqx 6 frictionless incline. The inclinehas a mass M anq7cxg, q3 wkw6v5n4zed 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?