07.10: Contact forces are examples of wh w3 wf*un3 vvv/ ,y-egdw/ifs3p)m4oe ich of the fundamental forces?

  99.02: Which of the following terms is NOT related.)cxfw2dx v)y conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubblsp 7wv7i 9g+2bqg ca.er stoppers and their resulting weight on ci 9 +agwvqg2bl7p7.ssome 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 magnit 2vndaf- le(vr+ 1cp2wd c)l9jude of the gravitational force on eacndp(91e2) a v cj-+w2ldlvr fch block is indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classrop:) +x mdumyhf0wl5 -oom ceiling by a series of strings as shown in the figure. Which st +x5 -0)hl:dpmyfm wouring has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M -za0( d ik:wri= 14.0 k。are stationary. The- a ikzd0wr(:i 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 argsx4p.82sn following scientists is most associated with the following statement: “For small a8.4gxs 2psnr displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angl8z; zida 0;nsye of z08 ; zdiayns;$\theta$. 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 ho wekus;:m6u*lrizontal floor at constant speed by means of a force P as shown :eks* wul6mu ;to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following , 3 m,;ljo*y4at3p rnzqpue7efour ways. In which case is the string mos,zy4rm73 pjn*qot ; ee3lua, pt likely to break?

  96.39: Assume the objects in the following diagrams have equal maspua19hn/kwr i(uv9 t u3t5uo0s and the strings holding them in place are identical. In which case would the string (ruw ku 3u9/pto9501uinhavtbe most likely to break?

  16.10: A person wishes to accelerate an object upwyh,o/zy6 zfsn s ; kk(d0 3i)k4ce.ieward 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.n( y,kz ;yk)s s0o keed4f3h/zci6wi the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at oneee5 gh0 -ai/zfcv9)oz1zt.e g instant of time, the mass has position 2.0 m, velocity 3.0 m/s,and ac5hzo. z e e)i tcafg/-zve019gceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed h34y /rxi-fh tto the right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the rightfhhy 3/4xt- ir 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- jludsqy 42 g*b-ly;b is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic frictubb-j lqd- y 2*yg4sl;ion between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane il:u*avf )a)q 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 plate as shown310 zwlze9bl qcv ,sq3 in the v 3 z19c,e0lzbwsqq3 ldiagram 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 o9b(ect;or(cfie):4ad) hf nan 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 frictional force of the incline ot rof(e) h;dna ):4feocb( i9cn the block

  01.11: A 5 kg block rests on a flat plane inchh/-/nfhwj::t4u 2r4 qxje+uuwk ,m ulined 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 friction is signibtf )4f,s/ia6 ) zjyh/4 dtwkaficant) 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 sshy,6tft /44bi)jadkf)/ w zaecond inclined plane?

  08.08: An object on an 7gli txqbxq5ohui*w* ) d(o2)inclined plane has a gravitational force of magnitude N 10 actiq** w(t5bl2h )uq7o)doxg ix ing 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 being pushea 6m(ko7pmhg k9jq p4,pg k/1dd at constant speed on an inclined plane. The free body diagram of the object is shown wi7k 9dm gjqpmp /(64oph1kgk,ath 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 M=6.0 kg with a constant speed od+- fdq e :kx3h5ybd*vf 5.0 m/s st y+d:dk5fhdbqx3*-ve raight up a flat 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 misplacc k) xb)s, s1jfb(sa9ded 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 block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the bk(as j))d x s1bfc9s,block?

  17.40: A small object of mass M is released from rest at the top of .*ucc g6 1 d uv0zzfi,3eh+0ypxeo w2va 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 slide, what is the magnitude of the normal force from the table v6eh1 ccwfz+. d0 *z0,goyu3p2ue xvion the incline?