07.10: Contact forces are examples of which of the fundamentv7mw: nf+ ks;zal forces?

  99.02: Which of the follow9g bkz4* 3,p xfsehzwm7zw3l.ing terms is NOT related conceptually to the others?

  02.20: The graph show7e ck(*i( n oz15hmzrws the relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope o1iho *nmr ez((57wzck f the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C,ic2du:bbp1c 4ir f-u , 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 block B?: i,-ucu2 fr ipc1d4bb

  14.04: Three equal masses are suspended from a claqk( py/;m fw-js sjt7+ssroom ceiling by a series of strings as shown in the figure. Which strq7k ;tmps-j j(yw/+sfing has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。are sta+n8n z4)c:djycxjga cii 174 (f z:obntionary. The mass M rests on the floor. zfij bccn8n:1y+ ca47x4d(:n ojiz)gWhich one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the followwosm i,h9x01z ing scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is prop 0wmoshx9 zi1,ortional to the displacement.”?

  94.26: As shown in the acaga :*y,7jd:tvz c4m xcompanying figure, a force F is exerted at an angle of zm 7 v:tcy,a:*d4jg ax$\theta$. 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 cs/ae 33 ur.nzh cua5:box along a rough horizontal floor at constant speed by means of a force P as shown to the r.a3uzsr3cea c:/hn 5u ight. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In which y5c+hv/qr d*icase is the string most likely to break?5/v yqi*+dhrc

  96.39: Assume the objects in the following diagrams have equal mass and the strxxtc+bpp+idq9i 0:m9ur4w+4oz6pn eings holding them in place are iden+q e4+n+c :4xzxd9i 6wtmi ppor09pub tical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which or1:w87i fru6od,lz 6+hq qmvine 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 an7,dm8r6olhuii:w fv16+ qzqry effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instant of time, the mg 3o2*s2 k ixmbt52pqkass has position 2.0go 5k tm2kisb 2*q2px3 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 right on a rough surface by jjykla *3 yk*20k sr0ya horizontal force of 15 N as showr y3yas k lk2j**0jy0kn, 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 shown in the figure to the right is sliding to th w)z d(3l*xjdy +9 l/pj,zqvpme 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)3pl yq9jx*zwdmpv+ ( j l/,dz floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane incl/;b-o gop8ldkqvr6( sq7zx9a ined 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 lhqq5ua b;2b; horizontal steel plate as shown in the diag a;5qq; bbul2hram 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 ing-c8c 5fqe* bncline that makes the angle θ with the horizontal. The block remains at rgf8bc*-cqe 5nest 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 fegvv1; nfc3/b *rj,qangle 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 signifi).k e n8nv7hbncant) in inclined at the same angle, it will begin to accelerat)v b8kenhn.7n e 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 inclis-7a 2onqlb 8qd anq,1ned plane has a gravitational force of magnitude N 10 alq, onn7-qba1d a2q8scting 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 the x-axis is parallel to the inclined surface.

  15.13: An object is being pus7 mvw(-uf) hhhhed at 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 surface by n. Which one of the following cf(m h)vw- 7uhhhoices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed of 5.fr*pzp 9wqftx*r99l28s jik7 0 m/s straight up a flattr 9 s9xpfpif* q8l rkz92w*j7 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 mispl8w -td5 e/cdgs7yv6o taced on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting from the inclingco-6 8dtd5et 7wsv/ye 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 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 a frictionlepi4wl sty/4 s,.agn 5 ma-hyy;ss incline. The inclinehas a mass M and g,5yn is;h ytmy-.apa w s/44lmakes 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 incline?