07.10: Contact forces 4u( v7k/hi nr,i(tlsaare examples of which of the fundamental forces?

  99.02: Which of the following tm;mp6 h5ufen9 erms is NOT related conceptually to the others?

  02.20: The graph shows thehm 6e-l sud05z:pmi z, relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is ,l-p e06zzumids m h:5a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest o6dx7ccw pf vj. r0- ix(:4:agdwlaay3n a table. The magnitude of the gravitational force on each block is indicated on the f7vxipf la: : 4(j3 adad ycw.g-wx6c0rigure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended ftrt mhc 5,9w4ix* ll6s15 exdgrom a classroom ceiling by a series of str5l ds gx19 c5merthit* x4w6l,ings as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。are sta go : zzfqcdjki,d /9gsmf+2;5tionary. The mass M rests on the floor. Which one of the following choices represents g 2:qcigjfd+ ,szfkzd m/ ;o95the tension in the string connecting the masses?

  14.13: Which one of the following scientists is moso; duh yav(58tt associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring voay td8(u5;hforce that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angleag-v:1-a p jii of vg- i-a :1ajpi$\theta$. 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 wood n .h19e.d zzwmelw7q 3*du)jqen box along a rough horizontal floor at constant speed by mwqzemuln1)d3*w qjh.d7 .ze9eans of a force P as shown to the right. Which of the following must be true?

  99.08: A weight can bc, g3qklb,7fyrxx:n( zn,6xpe hung in any of the following four ways. In which case is the string mor:gk,6n(c,bfq,zxx7npxl 3 yst likely to break?

  96.39: Assume the objects j()) yw-k1ifg)jgl (b w,ql9nkd1x zoin the following diagrams have equal mass and the strings holding them in place are identical. In which case would the striln)qd9zgf1blyx- j i(ogkww(), )1kjng be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one oe(ka. x.5gdx qf the following choices must be true of xgq.(xd 5 k.aethe 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 along the x-axis, at d.3hv a2,nfa ione instant of time, the mass has position 2.0 m, velocity 3.0 m/s,an3 ,aidfh nv2.ad 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 rightheas 3k3.xey . on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right at3 ..ayx3eehks 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 sliding to the right lzas: qg8g mrts5a 7: 0,z.zh8afhup sn0d b:4along the floor. A horizontal force of 10.0 N is b:fn7 z4hg8508.u0tasz gl:arzm qa ss,d :p hbeing applied to the right. The coefficient 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 inclined at an angvgt-bc 4. mbf0,qmf.jh1tz 9hle 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 horizont x4wo6m0 le3bmal steel plate as shown in the diage4wb 3m0m x6olram 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 ana-oj -yo lda4xqv)a2l .av z6; incline that makes the angle θ with the horizontal. The block remains aa 4)j6oxao-d .qy-v;z 2vlal at rest 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 plag .+(v dhpc(d:rt ,)uraljgm .ne 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 second plane (where friction is slh;l-cts.z8u ignificant) in inclined at the same angle, it will begin to accelerate at 2. cl lu.sh-t8z;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 has a g3v1ie. et h p0zapuc5:ravitational force of magnitude N 10 acting on it from the Earth. pptv:5ecu.3a10 iezh 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 pushed at constant c52t8rvs. a og 4o9jzdwz7tl*v8e-gnx lwm+)speed on an inclined plane. The free body w- c5.t)jv4 8zon+9xw 28 rmtdlg*eavzo7lgs 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 correct relationships between

  08.20: A person pushes a block of mass M=6.0/4g /. f ddx0qbtyfmok(:of) (ps0abu kg with a constant speed of 5.0 m/s straight up a flat df ps.(dku0: ogom 4af)t/fxb0b (/yqsurface 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 ankeofmvu. (+1h xr kvk: :xln6)a(v5q w inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting fr(euokkrvvmvx) 5n:: k6f(. +wqh1axl om 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 rest at the top of a m2zy a5h.b;/4gti2soorm+o z frictionless in2;bsro aomh4+2tzo m/.gz5iy cline. 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?