Which of Newton's laws best explains why motorists shoj5k 2w ap94)pjz+ft kpuld buckle-up?

  When you sit on a chair, the resultant force on cd. zg,(ojvy53hxg 0u you is

  In the absence of an external forze+r:o3v6wwintj , xeki9( 3oce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned ou+ lcir;3nmje6 3di:nff, while traveling in empty 3ldenn 3:c+iij mr6;uspace, the starship will

  A rocket moves through empty space in a straight line with constant speed. It i 4bm (/ricx1xw6ewre3 s far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to thb(rex3c me61xw4 / irwe rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, a5f dc9 chjiim 3((5gzwnd you suddenly fall forward. You can imply from this that the buj3c9wizh5m5f d(cg i (s's

  You are standing in a moving bus, facing forward, and you sq1 nxui v 58;0(ixtmcnw4w(anuddenly fall forward as the bus com0 n(nix(1anwcw8t5 4xviuq m ;es to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objectf+ 5yx(q upjy0.

  The acceleration of an object is inversely proportional hib 7mr9--mku-v8w:onai a3gto

  A net force F accelerates a mass g+x/qwo+c er9ms3.wzul,5dkkey2 d 4 m with an acceleration a. If the same net force isw, k4sczdludwoey. rx+ mk953qge 2+ / applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accelera .5d3+v k urtzumt0/jation a. What acceleration results if a net force 2F acts 5mu t/v+0tzkj3 urad.on mass 4m?

  If you blow up a balloo qq1 3 j4/rpnjrx(uvl*n, and then release it, the balloon will fly away. This is aq q4lj/ 3u( jnpx*rr1vn illustration of

  Two cars collide head-on. At every moment during the collision, the mag xdik 4/c a(hc/p+e(uoy- :3.cscgyn mnitude of the forc yched4(:cg 3mckui-/ x+./cyp n o(ase the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force whey o(5k9p-nizich the object exerts on you willi z-nyeo9p k(5

  Action-reaction forcex2t 3u5 58hro yttv6tes

  Action-reaction forces ars651q1olaoqo4k gj xbw ;0.pb e

  A 20-ton truck collides witlc 8(0m8ey8rsll-evu h a 1500-lb car and causes a lot of damage to the car. Since 8r euls(c e8 l0y8mvl-a lot of damage is done on the car

  An object of mass m sits on a flat tabl1x7*ml7 ffbdcg.wf1o3wrk c0e. The Earth pulls on this object with force mg, which we will call0 17gcf k *1bf7dlxfowc3m.rw the action force. What is the reaction force?

  A child's toy is suspended from thxezxy3es01qf e. xs+6e ceiling by means of a string. The Earth pulls d31z6.s+ yxe0xe efxqsownward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the bau02yle vi0:xqgc.8 m7;k rv wrll pitched to you with a 1500-N instantaneous force. The ball hits the b cm 2wrlvkgiq.7r; euyv08x0:at with an instantaneous force, whose magnitude is

State Newton's three 6lvs e 5lma9l9.ghfe-u*:lqxlaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on 2430vbgw sqh4 2ny8i4jwgv f wzfy3k 1Earth. Which of the following is j2ny 8iw 23wyz0k 4sfwfgh q 1bv4g3v4true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force wh9f0 g*ql s 2p ..auulcaj6*rgaich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 s8 )dod 2:ofva)f lu ny(*(qgjN or a person weigh8l )*gad(ujfd( :sv) o 2fyoqning 600 N?

  A stone is thrown straight up. At the topb7bdn l+r8c-t of its path, the net force acting on it i- t8+rnbl7bcd s

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the -zv wt hxbz.b6:l7v v j:nfe/7same height. Ignore air resistance. Compare their accelerb/vzb 67zj-::vhtxnvew7. lfations.

  A brick and a feather fall to the earttz*3*f7nos r mh at their respective terminal velocities. Which object experiencesm*rf *nt73os z the greater force of air friction?

  An object of mass m is hanging by a string from the cei kbhefr -g7qo1( h* psqrp:,l7+bm9qvling of an elevator. The elevator is moving up at constant speed. What is the tension i ol +:qrgps1qr*hhmbqk f, pv7e9-b( 7n the string?

  An object of mass m is hanging by a string from the ceiling of an 0k eq5 xd4j cvk(*ztj+elevator. The elevat(0 kdjxzkj*v 5c4 et+qor is moving upward, but slowing down. What is the tension in the string?

  The force that keeps yhme/tmd xd 2)5ou from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton f :+ppn1d p2fep5-ezlmrom rest than it is to keep pushing it with constant ve+lefm:znpp5pp-e 1 2 dlocity, because

  A horizontal force accelerates a box from rest across a horizontal surface9;a a) ih/q;uldr9e fb (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception th; iuba 9fr/9hd)al qe;at the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an ib,u 4*lrmg6 beb;j)fx wryc6x)ih5 k*nclined ramp at constant velocity. Thus we can deduce thatb4lck );hfu,6 *r brm)6ej *xiy5 xwbg

  A block of mass M slides down a fricti*y e1fw ey7kt j6.se2vonless plane inclined at an angle q with the hori7est y1 .fkj6ye2e wv*zontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane incli6tly ):(,wp al )tmugsned at an angle q with the horizontal. Thp:6)gw()tsltm ,ul ay e normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an anglezbjn2.1 wm: n pc31zi8jy;jdj q with the horizontal. The gravitand:w3 jj82cbj 1.iy;pz1 jznmtional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incline(ah2(qxj. (( jozthled plane that makes an angle of 30e with the horizontal. Make a statement which best descrilxz ((hj(.jtqh2( eaobes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the objecta686i zn5eekmk93gid ;qlo2 m,ia8i d m ze5ol 26kmnq36e9;gk and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from re v;q4jdqy ;g2 bbg g na.aiga20f:2w.ost to 27 m/s in 7.0 s. What is the average forward force ogiqd22b . f.04:;ngvo qbg;2jwgaa ay n the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.9 j,;cp w8cqki0 m/s in 2.0 s. What is the net force ;,kcw qp8i jc9acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.qov * 0s dba98w9eyajvru(2m:0 m/s after9 om09b: v(*qra2awseuy8d vj traveling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg mass /xk 3nmpfte: h-g5pk0,clkp 0with the same force that you push a 10-kg mass from restpgkt-0m k e cn03fh/,l5pp:xk ,

  What is the mass of a person who weigq)fw 7q +f,og1p(bmh ohs 110 lb?

  What is the mass of an object that weighs 250 N on the surff)o y nha-0phyy 3m/d:ace of the Earth where the acceleration due to gravity ip m 3ay/y:-hnfh)oy0 ds $9.80 \; m/s^2$?

  An object has a mass of 60 b 381 2igr5kaml 9co z(bc6l/qm3eyaukg on the Earth. What is the mass of the object on the surface of the Moon where themk2quaea/3glcy 1 liz b (36bmr 598co acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs et5* rc jd;pr)40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses 5dr )*jcte ;prof the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite enx7q*m dw- 4nyjds of a 5.0-kg rope. Sue -w*yx7jd4n m qpulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F act/)5 x5qxdxu yzs on the stack5 qx yz/d)x5xu, and it accelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a scale u ozv*k xt.w;*w t/yi.in an elevator. What will the scale z v*kwowit*.u; x/t.ybe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator( 2 zs)ncimsn9*hmwf 0. If the mass of the person is 60.0 kg and the2wzsn (c)s*h9m0i nmf elevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevato9c0 ;z.htxxntk5 4q xtr. If the mass of the person is 60.0 kg and the elevator accelenxx 9tth.qtk z5c0;4xrates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 9*bbs ef.f fr-r7fx 2v5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnif9xfsfb-2r v.f7* rbetude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg resbf5c9qwz s3 n-q+cf g (r;jvz5ix hk;ia*8:sh ts on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal(*5xgbjn -hiz fz3v5sh9c i;wcrf;:8a k +qqs force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It i t1,xs+,pfyha/b v9 zb 5bryo0s held in place by metyr,5abyxt oz1 pfs,b/9v +0 hbal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =;g*xgq1k 9x bqzw xi7. 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of th1q7xxk.x 9 z;qwig gb*e pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kgiy((7gpn qn x r1 vv)o,(stp+h and m = 0.40 kg, what is the tension in the string? (Ignore friction , th ((gso(yxp7qr+n n) ipv1vand the mass of the pulley.)

  A student pulls a box of books on a smooth hix/31bbnc**mknc 9kk orizontal floor with a force of 100 N in a direction of 9b*k3m*c k nx knib/c1$37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a box of books on a smooth horizontal floor wi:c8l vcz0amj05g 9oi lth a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal force 8zgv9l5 a: ojilc0cm0on the box?

  A traffic light of weight 100 N is supported by two ropes jx9mi gskq 5rexh826c2 5p7wpas shown in Fig. 4-2. What are the tensions in the xp6g h29rk57e8mjwq ci2p5x sropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the malkez39zu 5 s9qi0pc(*eaxs /y ss of the traffiz*saze 3/ pl(9x keqy5uc90isc light?

  Two boxes of masses m and 2m are in contacr5 jq,7izs) kzt with each other on a frictionless surface. (See Fig. 4-3.) What is the accelsqir7 jk )5z,zeration of the more massive box?

  Two boxes of masses m and 2m are in codrz+sps:iho 8:t1y 3 sntact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive h3s ozt: 1:si d8psyr+box?

  Two boxes of masses m andtr s9l1 uvru.3b4yo4w 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what iss4v.l93b yuwtu1rr4 o the tension in the connecting rope?

  Two boxes of masses m and 2m a)dwwgy40h/a w re connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive box?w04 a)/y wdwhg

Two boxes are connect;uknyfv 9 cm), n( f8sh+mfgq,ed by a cord running over a pulley as shown in Fig. 4-5. B;(hu+f n8,mncs,myf)vf9q g kox I of mass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of static and kinetic fri /dmgbef i 9qmp)ep t8:1yk73bctions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force f pebtmi)b1 :dek/mpqy378g9is applied to the box?

  The coefficients of static and kinetfg7 m-i:u2s7s;sqsh8y8cg pjic frictions for plastic on wood are 0.50 and 0.40,:cs- sijfg72;q8hsy m 87ugps
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a level surface in2kbg-1 rpgc)nep. 4yd the +x direction. It slows and comes to a stop y p1pbn.g-e4)r k2dcg with a constant acceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force.8 21n b-su)x)u 6j :rppgkalhb1un1sk A 3.0-N friction force retards thep)sbkgknuh1japl1u-su b n )x8 62:1r motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-dmenh/ 4(gz ipy 7w0h5vq3 tb1kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initphtr43csi 9,z5aewao9cpr - +bs7ss8ial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic fri ri5ppsbsht -3 wa zce7r ,a994os+cs8ction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0v n)b +ths95qfd7t ,uc m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevai7vfb ,9)unsqc5dt +t hling conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (Sj drs;kebdn0: k9lv z4:y1h 1no:l ai.ee Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface b s1 reol0.n;b4: d:1 z dykkv9a:ilhnjetween the boxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. e-ywk*qmx brw 6 1f*7y(See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth kfbe6* y mwx*r-1y7 wqand the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionl4p8 b j28rkwaeess inclined plane. The plane is inclined at an angle ofarj8 ebpk8w2 4 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill q+y4kp/: 7s jc di:qp 6(nyhv ps0edw:that makes an angle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on 3+onk tf3quka,* w/oda smooth inclined plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smoothfv3 txobf/sc c6r 2xx5b2 0e*d inclined plane tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides directly down an inclined plane, at a constant velocitu*nc7bqc : se(d*y2lvy of 6.*c(l2nbuc7 qd *s e:yv0 m/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m slides down a .y0q9fcnr(d e2o:h 8vxdf2l srough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slided,d3w jvdjv;ue++qg.h cv,a . s down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weighing 500 N along a rough surface. /r;:8dudw u id The cable attached to the logiu8;wr/d :ud d makes an angle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is released from rest on a rough inclined plane tilt vfn.bfl2 k(6ied at an angle of. v kbfil26(fn $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed on an inclined plane. The angle of incline is graduallkii n.ydg.,b3l0a:rcwn3s) q k89 wpuj/,vl hy increased until the object begins to slide. Th,j q3i hcww8ai3 un.nld .k krv:g),ysl/ 09bpe angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?