07.10: Contact forces are examplg+zpeb7db8 mgs34fa / es of which of the fundamental forces?

  99.02: Which of the following terptvcb8 9vnq5- :mo y3bms is NOT related conceptually to the others?

  02.20: The graph shows the relatfm-m )w37rv1g,mv 9 a cinh8;pep8qknionship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation of the:8-am gmpn)r18chfn 9p7mi ev vw 3k,;q

  10.15: Three blocks, labeled dd6/l/*q ;ncyyii( uwzef kb80d 0 j0qA,B, and C, remain at rest on a table. The magnitude of the gravitational force on each bl e/08czf(d0/dqb0 yy6ul w;qi ijkn*d ock 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 cepfk oq-iy2(h 77,nu yw)vg1lr iling by a series of strings as shown in the figu, l7 y-owif)71kpv(ryn2 ugh qre. Which string has the greatest tension?

  16.05: In the figure shown, the mass ;gd ut/z50ytt m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests onzt5ytg0du t/; the floor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following sci-1jbfrfn8ep (9q ftyqy2vit -xm2x(- entists is most associated with the following statement: “ rvffxpy((2nj12m x-e- fbq9y8t qti-For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompalgp/x bljj(/9w:yjn 2nying figure, a force F is exerted at an angle of nw xlbjj//lj9 :gyp2 ($\theta$. 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 r::/wr g0bmqrpd(4hrut jl9; rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following mut : huq r;b(jmrrd0r9wg:l p/4st be true?

  99.08: A weight can be hung in any of the following four ways. In which cnw9- k5nhd3 wbase is the string most95k- 3 bwnhnwd likely to break?

  96.39: Assume the objects in the following diagr/s+od6 toc5drams have equal mass and the strings holding them in place are identical. In which case would the string be 6td5+oo/csr d most likely to break?

  16.10: A person wishes to accelera 5wjjy))q3+de8ac ho o9elld/: fy 8rete 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 ae )lyjoe 8: c9j)oqwrf5leahd8y3/+dny 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, az 1kmu8yj5:g the mass has position 2.0 m, velocity 3.0 m/su581 aj zykgm:,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 thtpzo3 z:q,9mp )btc p5ooa *6ie right on a rough surface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the rightt93ac56: o) t pzim obop,pqz* 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 rig t6ka( 8-lpzmxht 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 i8 6mz-alk(p txs 0.20. The box is moving with:

  00.32: A block rests on a flat plane incl1fxf6kcpy 4kgju/ol4ovo 14+ 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 horizontal steel plate as shown i a:h:l8tn gb)4p/vsdiwi-fz 8n the diagram A. gf p4th)/iln:b svi-d:zw 88a
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 onpk3o9)/nr55i p 0qccw kd* faa an incline that makes the angle θ with the horizontal. The block remains at rest as θ *o)0nf35 adarccw q p/5ik9kp 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 ang ,,eiz ;(cqqz+uag+dmnctf -7 le 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 ii pa bi p26 51(gvp1mqe9jmhu/s significant) in inclined at the same angle,mp jvi1( b91m/ug6 ihqp5 e2pa 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 has a gravitx x;hi;jyp g/02fh .jxational force of magnitude N 10 actin2px gjhx;if0hyxj ;/ .g 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 pushed at constant speed on an i5l 7i ux(8uhm irz;un0nclined 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 o8uzh 0l7u5i ;n m(uxrine of the following choices represents correct relationships between

  08.20: A person pushes a block o zknk +*l/kg-yf mass M=6.0 kg with a constant speed of 5.0 m/s straight+kz*- /lkkgny 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 pla1r0zh hg)) 0trmz*ue mne of angle θ . When released, the block does not move. It is determined that the normal force acting fromm0rz0ze*r)1hgh t m) u 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 frictw-t4 - yddjy9hl;lk 5yionless 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 magy5y -9-lk4 yl dtdj;whnitude of the normal force from the table on the incline?