07.10: Contact forces are examples of which of t 13tihcg)1y5 3 0vlaozvm2zrthe fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the otts:o nu3qddqq6v9z8f)oa 5 *mhers?

  02.20: The graph shows the relationship between jkhxn:gw7hq kj(w1z((5 ofg 2the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representati:x2jk k1qh (7 w ogz((f5nhjgwon of the:

  10.15: Three blocks, labeled A,B, and a fswov3a+:s;a 7z2u hfbh( 6oC, remain at rest on a table. The magnitude of the gravitationaoa3ua( ozh:s2ha7f+f6wb ;sv l 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 are suspended from a classroom ceiling by a serie7qu0f2 ) lota g9al pzo/k9u3kl(i8rws of strings as shown in the figu 29aa79ut8oou(lz lkfwg /piql0)3 rkre. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and t bar+*i2vbrl(he mass 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 b+rlbr2 vi* (aconnecting the masses?

  14.13: Which one of the following scientists is most associated with the fos .:2agioi rf5llowing statement: “For small displacements of an object from equilibrium, there is a restorinfa 2i g5.sir:og force that is proportional to the displacement.”?

  94.26: As shown in the af 5669.vzfjhc1vx )3 htcmoadccompanying figure, a force F is exerted at an angle of f6joh1z v 3 )tmchca.6 9v5xdf$\theta$. 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 w7r kjo3,v euk7ooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following must be teojk73 v7k,ur rue?

  99.08: A weight can be hung in any of the followin7y9ac,zj1 uo maj*d7pw07 l :bfbo c0eg four ways. In which case is the string most lik ujzabe1fo0p do779*c0b:7c, l w jaymely to break?

  96.39: Assume the objects in the following diagrams hah iioua(.tu ohenz:ak+0;)h.ve equal mass and the strings holding them in place are identical. In which case would the string be mostkh0 th:nez +o.(.uohaiau );i likely to break?

  16.10: A person wishes to accelerate an *s/jmr2 xzc)f object upward uniformly. Which one of the following choices must be true of the fsfzjr2xm )/c*orce 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 the x-axis, at one instantews0cysxo65 y i*01whkiyb :; of time, the mass has position 2.0 m, velocity 3.0 m/s,and 5cey6:*b; is1wxy0hyko0ws i 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 rightdom*t5w8kt lno-*m de.-*5z cfjn4r s on a rough surface by a horizontal force of 15 N as shown, during the pu m**--e55.n dtrctklwf4o*8nmsozjdsh, 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 si4-dpxqdnjz /y: +j )jv bg)w*hown in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the4wz:i-+bjdx d*pqv/g)j) jn y 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 t 5ju9,h*fpry 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 ho+iz.wb:vd fd ,rizontal steel plate as shown in the v+d.:,dz biwf diagram 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 horizont8eplu bo p(cs/4l9ke9 al. The blo/l(pb o 9lce4s8upek 9ck remains 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 w;;7 nn:ynw( .ukptsjz *z :loinclined 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 secbc i noxx655+hinh4 u+ond plane (where friction is significant) in inclined at the same anglno4h u6x b5 xni5c+h+ie, 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 plc 5v6bib 0o.,c8k hfze1bu7iq5idg0s ane has 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 the coordinate axes shown in the figure? The y-axis is perpendicular to the kcobq5d .,86ig 57i e1cihbbfz 00 vusincline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is beax)y 3h(s+;q fdzj3u 8wb5q15ph niny ing pushed at constant speed on an inclined plane. The free body diagram of the object is shown with t;b3s pfq hiny3q1y (zjn+ adx 5u8hw)5he 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 choices represents correct relationships between

  08.20: A person pushes a block of mass M=6.0 kg withu k(- lofy1:dy a constant speed of 5.0 m/s straight up oydkuf-ly1 :(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 2ql ;r bp(qdjcfen: 7 */oo- n7zn7tdvmass misplaced on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting from thelt-*qd;n 77(cq rn/ nd v:o o72pjfbze 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 aa0v-8g)xmkosd, dn - 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, wha-) d gn,da8 o-v0kmsxat is the magnitude of the normal force from the table on the incline?