07.10: Contact forces are examples of which of the fundamental forceoa9bz1g fg-f,s?

  99.02: Which of the following terms is NOT rela ii w9y+ )pj4ghzw292nz: g*hotva r:mted conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number ofqoc6o n+ /)myptmsn;).jw. 2ow6 y xos rubber stoppers and their resulting weight on some f6wssnyo/ p.;m)x) 2moo.6y oq +twjcnar-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A rlle6 /j;te87jpk, me,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnj8le pej;ke,/76ltm r itude of the contact force on block C from block B?

  14.04: Three equal masses are suspended fromd,cu )t.4zfy lg2xf9u:b jd/):cvqgrawn4 m, a classroom ceiling by a series of strings as shown in the figure. Whi,f ,jcqyc):zlrg9umag4.v2 wn:t4fdb/u x )d ch string has the greatest tension?

  16.05: In the figure:a5 o1pqfqp.d shown, the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one o p :oq1.d5fpaqf the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated with the folu4:s7ko mo 6obgy43 :m bd5n)unfygs9lowing statement: “Fo:y9m5bn)u4sg4 dsooo my kgn7f63bu :r small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying l/6ud9 p/n n h(m27xbepcsn2rfigure, a force F is exerted at an angle of dsnx henpuc2(72 l6m/b9nr /p$\theta$. 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 cpx-oa-mv bh5,0 i ,z1-eey rwfloor at constant speed y-wh 0ciezr bpx,1- eo,mav5-by means 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 followq1 dwpk *bum))v +hqk+2ee* whing four ways. In which case is the string most likely to break? *+ vh1ueb+wpedhkq)) 2 mk*qw

  96.39: Assume the objects in the following diagrams have eqp,i*sb veg kkm4n,ey5i2m9b6 ual mass and the strings holding them in place are identicalgnb,bv 6s4kmiy mepi ek 59,*2. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an obje p4 -kca8o w:dxawo7-+j)zym9a, xizcct upward uniformly. Which one of the following choices must be true of the force F, providedz : xcy9c7-amp4wojd ,oa)ix akz+w 8- 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 alop*b* 14jmkuha/qbt v 0ng the x-axis, at one instant of time, the mass has position 2qu*ta 1j mkb/ vh04p*b.0 m, velocity 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 ro*98czo moe9sd.4uu k ight on a rough surface by a horizontal forc omu.8oud z9ks*9oec4e of 15 N as shown, during the push, the object accelerates 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 showntmsx;( sqd:5z g9f uuzda))1p in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied:zdzp a(g xu);u)t1s5d9fsmq 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 i+7l k l :5zsw-rrtoml llx 5nlw-10y5lnclined 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 aa j1(+9bpm/p -gruq k4 9jdiqis first pulled across a horizontal steel plate as shown in the diagram Aq q/jgiab4+mk-9 pd9(rjau p1.
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 tha2u 5 tz,x b:7utnki/mxt makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes ofux7tbi 2:n /mtzk ux,5 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 in- rsjlv,bm. nl,g,5 qai j.ju5clined 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 secof3,s.-pbf7vm er9 gh tnd 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 bf9, vp sf-.gme37rth block and the second inclined plane?

  08.08: An object on an inclined planew.i1b/wi k.hgxsa9;z has a gravitational force of magnitude N 10 acting on it froisga b 9/h.xi.ww ;z1km 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 pushed at9lo7:ex* wh2li;f2xvgw+:fci- dfbx 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 surfaxxl:27bd;oxv2fc + g fif* - eihlw:w9ce by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of/zo 1gnlgxs22 e:bx4u mass M=6.0 kg with a constant speed of 5.0 m/s straight up a4e:og 2x/x zsg21unlb 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 misplacedzl b/wf nlkmik. 5v8m)zb8 8w9 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 mzf) kwbviz/985 mln88.l mwkbagnitude 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 theq0e/kuz-zra: nxh 64 pd rw/4u top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a 4e40/azx/u-r6k rhp:dqzn wu table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?