Which of Newton's laws best explains why motorists should buckle-upodpm0kg q-9u:g qa os87o5/ahmlu * (g?

  When you sit on a chair, the resultan2 rqw (1yojxl)3d2vcf- ( j66lwkji get force on you is

  In the absence of an external force, a moving rsfmu29(.9wy4l e ucw/ gr a*robject will

  When the rocket engines on the starship NO-PAINr/r xmo0/p7ac7. yut k-NO-GAIN are suddenly turned off, while traveling in empty space, the starship willm/ ycku/t .r 7xop7a0r

  A rocket moves through empty spapa iyvklxa1migx**i 7v3::mt rmq5 85ce in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be appliiv1pagm5ai: 8m7q x3lv*ixk *y5rt m:ed to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing +bkafv,kh4x 5;5 pxlg forward, and you suddenly fall forward. You can implyhgl;xv+a ,5 bk45xk pf from this that the bus's

  You are standing in a moving bus, fa93r;d2zj( qqrgbp1+ gn,en tcc 7rb d,cing forward, and you suddenly fall forward as the bus comes to an immediate stop tqg2 7,rjpbcecd9rb(3,rn +1g ;nzqd . What force caused you to fall forward?

  A constant net force acts on an object. Describe the motior*7bk fok )z)en of the object.

  The acceleration of an object is inversely proportionalnr n g d:wv(w cnpl0d73tw* 25l(uic6j to

  A net force F acceleratemr777d l /88qxfo1mb rzszy-ds a mass m with an acceleration a. If the same net force is applied to mass 2m, then the m r7ls 7dm xqr1/b-y8df7o8zzacceleration will be

  A net force F acts on a mau +gt8q ycknfabg-7* pwbr,h5 v9;4uu ss m and produces an acceleration a. What acceleration results if a8g bpw7tb-hu acn;+5gvyf9 *u4,rkq u net force 2F acts on mass 4m?

  If you blow up a balloon1 riu65fy38wu8r0numo - h4 whptz /or, and then release it, the balloon will fly away. This is an illust0 z /8fuu4t rhuhwpw -ym1roi 586r3noration of

  Two cars collide head-on. At everpq .ytpt7eg0epn)* n1 y moment during the collision, the magnitude of the force the first car exerts on the second1etypn*0. qep )tn p7g 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 which the object exerts on yout.bqk /mmj5w 208t egv wil82j wbkm tmv.5/ gqe0tl

  Action-reaction forces 5d:t ia(exwnyl/p m71

  Action-reaction force )tzt 36chr4 8qp(fjpkdci8p9s are

  A 20-ton truck collides with a 1500-lb car and causes a lot of db-ldu;mc4 7 y0c+ xzhb m-(jivamage to the car. Sci-cu m0- xbyv7m;z( 4b+h ldjince a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls onau pojm k6xx2w5vl:1t8 w-my* this object with force mg, which we wi156l-aux:x8*j mypotv kwmw 2ll call the action force. What is the reaction force?

  A child's toy is suspended from )7zus( :qmybpgg*hq, the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this isg) zh:y7qb,pgu sm(q * the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instan8vcux40y*nw3xa t v3etaneous force. The ball hits the bat with an instantaneous vyxv 483n*tuce3x0wa force, whose magnitude is

State Newton's three laws.yz1bd8ezbnt: v;c6 ,c

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eap9 /of/zm 5k;qehxdv*rth. Which of the following is true about the mass and weight of an astronaut on the Moon's /;me k9z pdfvxh/o5* qsurface, compared to Earth?

  An example of a force which ac2hn 8hl6)kny ko1t:f dts at a distance is

  Who has a greater weight t-y.ho s5th*h qo mass ratio, a person weighing 400 N or a person weighing 600 hhsy-.to5 * qhN?

  A stone is thrown straight up. At the top of its path, the net force acting ild:wa-c0rp d-9rgpg6fw,n u 8a2qk 9on it isp8afd9n0i6lu2gc- ak, 9w wr :qgr- dp

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same rag.5 l7grt;:k)0iskmw:bo m height. Ignore air rg 5m;mgr w: r:t7ikb.ko)als 0esistance. Compare their accelerations.

  A brick and a feather fall to the eat72 e duq ysn;7c 3cu;j8qa,g2lvqw1rrth at their respective terminal velocities. Which object expe q;lv,2auu c7 qytj;wc 1r3gs7d e28qnriences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling ofu7 o+p.tt29.3bcl90pdmdu mfbtdkp+ an elevator. The elevator id37pm+luck9 f0bp d. tom29tbpu td.+s moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator,-uvj o + ,ou jl8haxp6fh22tn. The elevator is moving upward, but slowing down. ,pu,vhufot2n6a j+ jx82l o- h What is the tension in the string?

  The force that keeps you from sliding on an icy 2k2 8msamt9*p*egqy 8 kmhwz8 6o4kf isidewalk is

  It's more difficult trps85c7ay; +optf2n 2xd-tuy 4i1odzo start moving a heavy carton from rest than it is to keep pushing it with constant velocity, becaupnc-4d;zi21 fxyutrt2 po+5asy7 8odse

  A horizontal force accelerates a box from rest across a horizontaltv-+rwe(cucofu xo i( :; 1jd4 surface (friction is present) at a constant rate. The experiment is repeated, and all c4:dtufou-iorv(;c(1e + wxjconditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus we o4fc kytgki52i :e9)jcan deducj5k92i ki fc)t o:ey4ge that

  A block of mass M slides down a frictionless plane inclinef;mudae dfg; ) 51:vzxd at an angle q with the horizontal. The normal :;;fv xae z1)gumdd5freaction force exerted by the plane on the block is

  A block of mass M slideskd3;3sfb/p/jf jsz 3d down a frictionless plane inclined at an angle q with the horizonta/3 /ksfbpdjzjsd ;f33l. The 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 anvkhavca *.i7 0o tzx.0gle q with the horizontal. The gravit0 .tzk7*ovcxi.0 hva aational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneoum2 p5kclmun*/xolg 27 )bed7csly on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their alox2ugc)/pbnm2e7l dk c*57mcceleration after being released.

  An object sits on a frictionless surface. A 16-N forceh:yv;3 z+bvg7 8f/nn ptivwo( is applied to the object, and i wyv +np hfib:zn3otg/7( v;v8t accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg lr9jv3f9y te,2lht4r9 *zfxvcan accelerate from rest to 27 m/s in 7.0 s. What is the average forwardt4f r tzj*9l fy9h ,2x3verlv9 force on the car?

  Starting from rest, a 4.0-kg body reecyeogz9q8* :yaxp( *of ; +vkaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bo* 8pz*:(ey+a ey f oqkxg;9vcody?

  An antitank weapon fires a 3.00-kg rocket which acquires a speee:tp - (s-o0c/dwbrwp d of 50.0 m/s after travelingop/ tbwp cws(e-0d:r-
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 with the same force that you pusatw6 w/702h 5t zcofvkh a 10-kg mass from retwco67 wfat hk2vz/50 st,

  What is the mass of a person who weighs 11b* e xziov h. ,(:rc0cfj1ca5k0 lb?

  What is the mass of an object that weidpi8,htb jx,bdu.nw4q9r1nzm1ah . / ghs 250 N on the surface of the Earth where the acceleration due 4 11mn,hw d/.xdpn bhbi9tuj8rz .,qato gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mn4n/fwqch) gfe71 p ;tm75cyyp m)-rz ass of the object on the surface of the Moon7/zpmw ycm5 c7yfrt4gn e ;np)fq)-h 1 where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on evp2e78 afvx* in 6;gmEarth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the 6v ;gf7p2n 8ximea*ve objects.

  Sue and Sean are having a tug-of0 i;ra 8jj r))lefe+utq. c8fy hyb:m,-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. b)fa8hjjr0iu: m;lye). trc 8y+,qef 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 ac40t;rsz6f riu ts on the sta0i4ft ;uzs 6rrck, 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 in an elevator. What wi:oc g.ln1 bbzj/z ;3wd3pa vw)npn p29ll the scale be reading when the elevator is acceleratin9 /zpa z;wjd3c2p.3n )b1bnpv :wg olng downward at $4.00 \; m/s^2$?

  A person on a scale rides in z0g :2q(8fbmn jb6wii 6 lucc7an elevator. If the mass of the person is 60.0 kg and the elevator a0:26ub fg blc6czwjm i87n qi(ccelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in aet sx*/w 61d8ek wdn:qn elevator. If the mass of the person is 60.0 kg and the elevator acceler:exdwskt 68e1d/ * qwnates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One for8-l,7gu,x ccw2bccq bce has a magnitude of 8.0 N and is directe8gc blucx -,2cw7cbq, d due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck-a*6 )c:k2q jbqaxpa f7v -pmx. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is travepm2cvqx- -fp7qa a)*6 x:ajk bling 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 is held in p/3ps za(yhd k k2,ecm;lace by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is chp;s/(d ae k 3,z2myktraveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machinev/aeb0a y/*q0+gob qdn0a0 cz shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.) //zbnvqg* cq000oe db0+yaaa

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 h:w-3u- 3ftl dpa(cfs kg, what is thfwl cs--p tdhu:33a(f e tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smd nj/( 3(yus*c *5eu2i msuhwpooth horizontal floor with a force of 100 N in a directi(u iuwy/* (3seumpn2c 5sjdh *on of $37^{\circ}$ 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 smoo6 o)pdwf w 2s*9ez7kolth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. *7 o6kpsolwz e9)2fwdIf the mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two r (db*apv re.pmi(qc,+opes as shown in Fig. 4-2. What are tdicp(vbp+* .a ,e mq(rhe tensions in the ropes?

  In Fig. 4-2, if the tensionsje+(r)2bhty35th mv g7p 7rlbl y9- gz in the ropes are 50 N, what is the mass of the traffic l9vrzt 5 jert7b23ym- h lpg)b(l+h7ygight?

  Two boxes of masses m and 2m are in contach+au 3dac e4/ct with each other on a frictionless surface. (Sccea/3 d 4hau+ee Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses cym3 dsiq xpc,.q ;2;km and 2m are in contact with each other on a frictionless surface. (See Fig. 4i c;;s 2m3qqxc,.yd kp-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rhbf +d+yo w98abckk6;:- s5czwr *yg gope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the :9o6fgz +5hykad+; cbs 8r* bywwc-kg connecting rope?

  Two boxes of masses m and 2m are connectedhxl5/x f 9xf8p by a rope. (See Fig. 4-4.) If the forward force on the more maxf8 95h/xxl pfssive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulleyb)nu5avdt ,md vlyu6qd.)8 a8 as shown in Fig. 4-5. Box I uvd.dmnu a5ayqtv)68)d,l b8 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 ki8vnu:t6p uo:0)7fev3p)5g ci v yxzge netic frictions between a 3.0-kg box and a desk are 6utnfv:ye)0 vopggzxi:853p u) vc7e0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0s( 1t0:rmzzk./bn2 ods.c b sl.50 an0sc nzd .z.o/bt:r k(lb1 ssm2d 0.40,
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 in the +x direction.3k/j.evkn cdi u7 -.7il4 kqxly8 y+nz It slows and comes to a stop with a consta k .+lx di7kn4z8-yvl/n.ui y7cqejk3nt 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 ho9 wb,e;b5j3j v*ezgm ix88 gywrizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration obge yj* gw5iw;,8jzb 8vme9x 3f the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg massorc5*zeixb ,+, 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 initialxjgy 7nv7n2k3 rmoq,eb3v/ o6la ,()ix ry2 tl speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient oxlvk g,mvl7eio x 73ajy 3 ,r22)br (/ytn6nqof kinetic friction between the puck and the ice?

  During the investigation of a traffic accidkfb6x;h9nld. s+jormkh ,+n 7ent, police find skid marks 90.0 m long. They determine the coefficient of friction6 hs k+hn7rb of+;. d9jnxm,kl between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4c tv 4 isq:-i2+s;b-vj+ wofja-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between 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 massivevq ti:j-s4a ;+jbc+-fv oisw 2 box?

  Two boxes of masses m and 3m are stacu)vc1)maqh541 y wjb dinhv84ked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and 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 b) )qm44wcjyb dh vh1nv51ua8 ietween the boxes?

  An object is on a frictionless inclined plane. The plane is inclinod;yh2k/hkv1 x.r )xl ed at an angle of1ok.;klxhx2)v h yd/r $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of 3 w9 8) klog(zrh:zqxf$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined planedz ljwty)j/; 4v6 q6am 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 smooth inclined plane tilted at an angl,n )qcva: vjy xb 3hu:nd6r/k4e 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 h. 2njcilg 90a n82bpj.u nsv*,g;8 p skdz-ladirectly down an inclined plane, at a constant velocity of 60bpcn2*plhsd9n njs.a , 8.;giv a8l j zugk-2.0 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 slidesq /-zx26ahttt down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass mwwzl,*9qz6 - 49xnciai-ptgngxc, 0y slides 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 -,m*f/cr8siz6rd fk*8w v bbyN along a rough surface. The cable attached to the log makes an angle ofbw v zfrbfcm8 -i,dk* /*r8ys6 $30.0^{\circ}$ 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 releasn;eb9 a*)mc wied from rest on a rough inclined plane tilted at an anglem* einw9 ;bc)a of $33.5^{\circ}$ 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 angle9zo gfmh,rg9klr 4yrd(08 d 5h of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static fric 8h0 zk9dg r, (gyd5fmohr4rl9tion between the object and the plane?