07.10: Contact forces are examples of which of 2o )ig bdj:cj4the fundamental forces?

  99.02: Which of the follown52/ft6 l7z ju: rfznning terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber nks*.cknl d64ugj8 g;fa m48o(c8rj xstoppers and the nnkx 8 o.k(rs8;gcd*fcjgau6l48 4mjir resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,.a4a4w+bo4xol lu ab3 6gv:kw4 *1qk ihz 4sauB, and C, remain at rest on a table. The magnitude of the4uwi4h+lla4*u x4az1vo6 :a bskq.w3g4 bka o gravitational force on each 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 classroom ceiling by a serido,7 nq2bhx ,mes of strings as shown in the figu,qobnxh m,d27re. Which string has the greatest tension?

  16.05: In the figure shown, the mass y0 8snlz4-gjfm = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting th fyl0-ns84jzge masses?

  14.13: Which one of the followm:*/ml/cmq t king scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is propo*t :m clk/qmm/rtional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exertkf/8 -zgz;ogm3oc eu)ed at an angle of oc-;/e)zgk8zo gf3 u m$\theta$. 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 afzt41feyz ny 5sf ,*6x wooden box along a rough horizontal floor at constant speed by means of a *y,zx 5f6fs yfznt1e4 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 following four ways. In whict.qgn ;j fbp56, d3* l/rejxwxh case is the string most likely jd *,lfrqbge;p6nt53x xwj ./to break?

  96.39: Assume the objects in the following diag41 8elixma.0 wi.cozqrams have equal mass and the strings holding them in place are identical. In which case would the string be mos.41w.l i0ezix qo c8mat likely to break?

  16.10: A person wishes to a+ cj sv:nc+n.7n4o*dwvb. st8t) ulsuccelerate an object upward 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. Ignore any effects n +o.w4t u)s:d nv7+lvb ctsj.ns*cu8 of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass movh. 4fl 4b6tvnres along the x-axis, at one instant of time, the mass has positio.h44fr t 6vnbln 2.0 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 t l 8 o7k:o3aw4pn4lurmo the right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to them8loup7: l onak 43w4r 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 sli7 f96jak c3*m2auv x)aamjw:bding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The)aa:m2bvkj j 93a6um*wa cxf7 box is moving with:

  00.32: A block rests on a flat plane+yo g-0m6)h+fcb:lth eo8 iis 4gbku6 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 pl 9 ,mt*eyk:xwdate as shown in the dia:w 9d,y*em xktgram 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 an incline that mmsmp yqea 2v*+5) izd/*0tvfzakes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and thyptz q+s)* zie2 v/mv0f5d*m ae static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inpod*y9ql7g0a j v/+cw clined 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 p.iz+jnw dp c23 wmme:*x7.oktd jz s.*laced on a second 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 block andmw3z s m+ d* z2xeo*wjpi7nc:j.dt.k . the second inclined plane?

  08.08: An object on an inclined plane has a gravitaq1e pxgc;kag3 6-+haitional force of magnitude N 10 acting on it from the Earth. Which of the following gives the correc-;+hqg3 e1a g6iacxkp t 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 speed on an inclined plane. Then819* f sr+rpg(q.cxudt1nx x free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, tsdxfru* rnq(g.8x p9 +1c1ntxhe 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 spe:fpald10sdd p:ji ( )b6 zroq/ed of 5.0 m/s straight up a fla :0do 1s6bdjirz fpdl( a/:p)qt 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 misplaceg *bl6dw36/h5pxplb89d )jn t /gvjkh2eaxg( d 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 anghn 2/x hlk*wpgt/xl) ejjd gbd bv58 663a(p9d 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 6 tbp+s *6g.jbmjsie7a 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 on the ini ps7*ts+jjgbe. bm66cline?