07.10: Contact forces are examples ofve3q uqa0g 4hzh:) y7j which of the fundamental forces?

  99.02: Which of the following terms is NOT related conce hl6im s.xt 3x+rs63hyptually to the others?

  02.20: The graph shows the relationship8h1)zwndk7w,ibb a r5 between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope r7dh aw zbiw) 8k5,b1nof the graph is a representation of the:

  10.15: Three blocks, labeled A,B2 h9g a va2blmx(yu8k jp1j-* ghc*, yt4xlo9j, 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 magnitude of the contact force on block C from *yh-ulo1hxjjgk9cayv* 9a,2l8( 2g 4bpmxt j block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a series of m/p/+5g ng *aca3 eixrstrings as shown in the figurernm/+5 xa/a cg3epi *g. Which string has the greatest tension?

  16.05: In the figure shown, the mass m l, px2amz,pn6ym3qc9n j,w,h = 6.0 k。and the mass M = 14.0 k。are stationa ,2yz9lwnn6aq3,, jp h,pmcxm ry. The 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 fol8v)7fyg4-tjmur- - gxm1gmo c lowing scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportionr4mxm)j tvg8 - g7m-1 ycuo-gfal to the displacement.”?

  94.26: As shown in the ackra;siybhz;1 ,e4k-*gfaw y 9companying figure, a force F is exerted at an angle of e4k-y;z ,bwy gaafi k*;r1s9h$\theta$. 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 . sb/xh/,t h.k0y wnachorizontal floor at constant speed by c0ahn tx/ws/y.khb, .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 ouhb)9x 4aljn t)iz3:rf the following four ways. In which case is the string most like tj)ahui:b94xr3z)ln ly to break?

  96.39: Assume the objects in the following diagrams have equal mass and the 9ms 1vwsg5cf2ci ( fj:strings i(2msvg :c 5 wf1fc9jsholding them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object b p;e c;vqizc1d7 2d c)cd+(cnupward 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. v p2zc1ni+d;7;ccdceq( ) c bdIgnore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass movf.g q we90jlxc;h ;4dues along the x-axis, at one instant of time, the mass has position 2.0 m, vch;g wx ld90 ;fj4eu.qelocity 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 ri hj xu9*c mq(*tqz79oepfom.pxps 9).ght on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformluotq.h9e(c9pzp s x *o*)mm97f.qpj xy 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 the right is sliding to the rightnef2: 6c 1wgpe along the floor. A horizontal force of 10.0 N is cw:21e6fnpegbeing 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 incljimv yym)n7 )z5ngq6(-7ry fpined 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 shoc5hontxf /9n rc)ry i5hypo18my 496hwn in the diagram A. nh4y8/oo5 h 9cy1xpcr9tfmr )n y h56i
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 therxv 8g-+ /trno3osf/q angle θ with the horizontal. The block remains at rest as θ is +n8//v3-rx rgqto fsoslowly 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 inclined o*30ki )2(d f( - m tn:zjlamvetik3coat 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 seco6bsbdilp -h;9 k)nb vs1 ,xes(nd plane (where friction is significant) in his-bls,; (9)vn e6pdk 1bb xsinclined 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 second inclined plane?

  08.08: An object on an inclined plane has a gravitationpu/rl.wp+a0c l.8(zm qa i nr+al force of magnitude N 10 acting 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 url80.z r.wic+ppq/na( a m+lis 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 inclined plane. Thekp4,wl4y 0ls e free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied ee,wkpylls044 xternal 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 constantwf9sk +ak-:il6hi 61m +owotq/l :de z speed of 5.0 m/s straight up a flat surface inclin9 +md/ 6iosk et -f:lkwaq1o6wlih+ :zed $30^{\circ}$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 misnyxyl fgoj4:0 d9 *c4lplaced 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 xol gjyn:l0fy9d44 *c0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is relvrj/bs6 df5mf *(3dms eased from rest at the top of a 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, whf6 dj53 srb*(mmfdvs/at is the magnitude of the normal force from the table on the incline?