07.10: Contact forces are ex.bm i8e.uf5vm amples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related con,zq:s stug d9 wg0i:x8ceptually to the others?

  02.20: The graph shows the relationship between the mass of a nurf eaiy;npmn v: ;htc686ac9; mber of rubber stoppers and their res;hnf 9rv6a am:86cypt ce;in;ulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, an w5uol1uir*f8 d C, remain at rest on a table. The magnitude of the gravitat1ufw*8i 5roulional 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 massee -5x/s tz:+uhodtre5 s are suspended from a classroom ceiling by a series of strings as shown in the figure. Whi e5z+sx erh /ot5u-d:tch string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M 3:fqbwq 9uw8 (wx/zlf) k-b gd= 14.0 k。are stationary. The mass M rests on the (bxu kqfb8l 3wfq):/ w d9w-gzfloor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is m: /n6qu bweo iiy.p;w9ost associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional toi:w;qo eyu bn6.w/ pi9 the displacement.”?

  94.26: As shown in the accompanying fiynk04 ds*rhapwi +0ai27d+w igure, a force F is exerted at an angle of r7ik *4 +wi wydsian0h+p0da2 $\theta$. 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 alongoruxo 6 /d*dn*sya(y 1 a rough horizontal floor at constant speed by means of a force P as shown to the right. Which o*a/ox *r1u yd6nyod(sf the following must be true?

  99.08: A weight can be hung in any of the foen6( d.t 4lcfyjg8vn9 llowing four ways. In which case is the string most likely to break? tn(d 8l6egj4. n fvcy9

  96.39: Assume the objects in the following c3vl*n-y u3to ml gf 7s5fz;zrbp:2x;diagrams have equal mass and the strings holding them in place are identical. In which case would the string be most ;*zulxfb5gs;zpmry:- 273 n vt3l fco likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one33,m amm4o fg-wxpgm 0 of the following choices must be true of thm f,-m 0p3owag3mg4m xe 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 t+wsarfllg71t +w yu/4he x-axis, at one instant of time, the mass has post+ga+ wl71/l wufs 4yrition 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 ixw- howttu *+4fj(gt2s pushed to the right on a rough surface by a horizontal force of 15 N as shown, durif2-oxwt t*w(guhj4 t+ng 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 shown in the figure to the right is sliding to the ripstc 1u6 91u 8q(ptjlsght along the floor. A horizontal force of 10p11u sju 6cpt9ls8(qt.0 N is being 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 angle eg.czi3 ulwy m 8/bo3s0sb*+uof $30^{\circ}$ 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 9/q bxxhka k; zl40fsf 3hf/y6steel plate as shown in the diagram bfa9/slhxfx h3 f 4; qk/06kzyA.
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 thes rh*3 g9 jolth:5 weskpd/2,e angle θ with the horizontal. The block remainskw3l s * ehp9:eg2,t drh5jo/s 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 plane inclined at an angle of f br zm5r ;hq;08jnrl5$30^{\circ}$ 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 ssoxd .e,+ ,ewrf2x o;gyec0k, . q,sthignificant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between theswe,q hcoof.yr+d,, t0sxg; e. x,2ek block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magni-5ev dh lk1ap2dlhh 61;8 wdkotude N 10 acting on it from the Earth. Which of the following gives thaokkh;dw lvl51 6 pe8 -d21hdhe 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 speed on an inclined+de r)0ot np ;3an(yju/p pu*h 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. Which one of the follown 0d*he ;n+up/3p)(yrutjaoping choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a cop0 zw gy3)fl4 m;po*derg xleql*0-x/nstant speed of 5.0 m/s straightx zl-3ld f0p/0gexq*4;lpmwg er) y o* up a 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 misplaced on an inclined plane of ang4os1( g821 n ieru8j xux3mn rxz*7awfle 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 Nxn8g4 xeuioau*3 28 wz1m7sjn(xr r 1f. 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 n0ug4r9cox 1d 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 slide4g 90rndx 1ucos. During the slide, what is the magnitude of the normal force from the table on the incline?