07.10: Contact forces are examples of whic57h6jl vhmo 8ih of the fundamental forces?

  99.02: Which of the follo nxao z0s:dzk3sllb 72h,;9dswing terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship be3jsn *c 5zt;dftween the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a r;t *f5zscj3 ndepresentation of the:

  10.15: Three blocks, labeled A,B, and ez 1hf*a fv,jwr8j06u C, remain at rest on a table. The magnitude of the gravitatio0ajef61 ,z jhf *w8vrunal 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 y jt5td tr7ry4i;:0ncare suspended from a classroom ceiling by a series of strings as shown in the figuretrt y;c0i5yrd j7nt:4. Which string has the greatest tension?

  16.05: In the figure show kh2* jnocxik,m7u;j c+b*2ec n, the mass m = 6.0 k。and the mass M = 14.0 k。are stationary. The makjxc *ch+ n*b,2ic2ouke j7m;ss 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 following scientists is most associated with6mjp;.ziaprr/. l 0wkczlm.1 the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to tk./0 lw.z;zm6.i r p1rmaj lcphe displacement.”?

  94.26: As shown in the accok r7j )mx3a +rj*0wfoimpanying figure, a force F is exerted at an angle of wk+)3fa 0j* i7xrom rj$\theta$. 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 hor : nx0p 6,gy;(gtjolnuizontal floor at constant speed by means of a force P as shown to the rigg (,o6 0gnn jutl;pxy:ht. Which of the following must be true?

  99.08: A weight can be hung in any sto+x ub 0l4et7n*qx 3of the following four ways. In which case is the tu*3eb l+qt4oxx70sn string most likely to break?

  96.39: Assume the objects in the followinb ph,g:2/nsnfklsb w*0i v+ 3pg diagrams have equal mass and the strings holding them in place are identical. In which case would the string be most likely to br :gnis0v,ns*p +lb2f bw 3p/kheak?

  16.10: A person wishes to accelhbp; ;vmiso(pi( siqc ;9:8wmerate an object upward uniformly. Which one of the following choices must be true of the force F,q bp ;s8v i:;m (9mpw(;csoihi 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 xy70i; gvrq 2j*jmdi, :gnfh*d -axis, at one instant of time, the mass has position 2.0 m, velocity 3.0fyrnij,v gh7 *d*gd:q 2;imj0 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+jraut84i 5d udhr1 m3ght on a rough surface by a horizontal force of 15 N as shown, during the push, thehrt5j + iru4d d38mau1 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 shown in th wv*6gzv(k1i sx1sgnz m cv0qji/4g,6e figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of k s1gkqiz0z6i 16vc(mjg4 sx,g/v vnw*inetic 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 anx63nlped 9 s n+2wg0lrgle 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 firstykya, b:q 5a(lf c4p2:z0axo a pulled across a horizontal steel plate as shown in the diagc:5fa(pxlo2a a:,z ay kqby04ram 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 awof.+*21omrct9 nqgi )fxhg9n 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*ocgg2hqwt. n9o+f mx) 91fri on the block

  01.11: A 5 kg block res3y )j8au5pxd2hqkjj) ui8m b ncf0.e 5ts on a flat plane 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 significajwcoxcf o0 t 5h.q+5: xp0trf4nt) in inclined at the same angle, it wq0 oxfwj : .+ctx55htp0rf co4ill 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 gravitational fo5o2. g,ij rjxjrce 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 is perpendicular to the incline’s surface while theji5xjgr,2o. j x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at g 4 q0gv,.ai tlsse(mvvas:(u/k-y) gconstant 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 surface by n.kgvi0)(,l:4st(s v yu ag-e av/g m.qs Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.v.sjuli:r f* 50 kg with a constant speed of 5.0 m/s straight up a flat surface incline* li.ur 5:vsfjd $30^{\circ}$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 bloclt) 3 pohci.6-1f kpsfo-v2ppq8o/b tk of mass misplaced 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 andft.tv1lb8) o- 6 ppospqf /hk3o pc-2i 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 relez9s-e6 /: jq xk,cuyolased 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, what is the magnitude of le6:uxo 9q /kj,y sc-zthe normal force from the table on the incline?