07.10: Contact forces are examples of whichn fx**g s( -om:uxpz7a of the fundamental forces?

  99.02: Which of the following terms is NOT related con 6 n 1rci(tg;cfm,dslqak:8: mceptually to the others?

  02.20: The graph show f61pv4 jkdrn +hejk0+s the relationship between the mass of a number of rubber stoppers and thei6hjrf p 0n jk4++v1edkr resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. Thetwvyk0 tcua;jdbxh.7 6(g- -k magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact( gtky.6jvaud-7cwk-tb0 h;x force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceilingy glx ht,n+b1 *17:dw6zuaicr by a series of strings as shown in the figure. Which string has the greatest tension?r b1,uxh+di6yt*7glcznw1a :

  16.05: In the figure shown, the mass m = 6.0 k。and the massu3z2jnlys1 j7 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 connectiz1 j7sy 3jnl2ung the masses?

  14.13: Which one of the following scientists is most associated with the foll8;mm2y1;t6hizkwn ut ui 05mjowing statement: “For small displacements of an object from equilibrium, there is a restoring force that is proport6 y tz28 kjiu;mi;t5 muw01mnhional to the displacement.”?

  94.26: As shown in the accompanying f,)czsfvnq7t: igure, a force F is exerted at an angle of zqc7vs,tf:n ) $\theta$. 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 horizonta 6i.gogab* v2al floor at constant speed by means of a force P as shown to the right. vg aia6o. 2*gbWhich of the following must be true?

  99.08: A weight can be hung in any of the following four ways. In :h0 zbwja5yy; which case is the string most likely th;0w a:b yyjz5o break?

  96.39: Assume the objects in the following diagrams have equal mass and wd 1v/- mv1nbkthe strings holding them in place are identical. In which case would the string be most likely to-1v kw/1v nbmd break?

  16.10: A person wishes t;bsd9g uw 21 ;; yibglwygd2;eo accelerate 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 grg1gu ;b;yiwy;e2b ds9d2lw;g avitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves alonhooqc-r 5p(u 4g the x-axis, at one instant of time, the mass ha4r( -ophcuqo5s position 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 pkv6 ppnm dvevr8 .(p6l9b,: o six7c3gushed to the right on a rough surface by a horizontal force of 15 N as shown, during the push, the obregk ,.v3cox6pp n 8bs6(i: 79mplvvd ject 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 l3/nohyqg, :jsliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficien/jn,yog:3hql t 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 in7 r knle(x;7wnclined 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 s;/a: b n eozmj2ltrw)w16o7qfteel plate as shown in the diagr/r1m2n;f ojwezql abwot:7)6 am 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 makes the angle θ with the horizo2os+3+fvwooel7ml s *ntal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the incline on o+so+ l 3lw7vfmo*e2 sthe block

  01.11: A 5 kg block rests 8 + ix(ihd-mpmon 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 (wher iq0u1s.x u,dte friction is significant) in inclined at the same andu.u0s,iqx 1tgle, 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 m8tyfrn. bv7-yn9v/pxp8 r,*v e1 epshas a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for rxftn/v.vv8- nr*yy 91pesp, bp8 m7ethe 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 inclii ;adhh om*,*fned plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, theaf*h i*,h m;do 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 masvk1;9l jwjj/vs M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface inclik jwjv/j91vl;ned $30^{\circ}$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 w0rcn 7kb92wn on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting fr27wcbnk 90 nwrom 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 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 frictigdv(jg-i o, +aonless - gjoaidgv,+(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 incline?