Which of Newton's laws best explains why motorists shoe ax nyep2ot37k.9aokw sc;v/2q9k x1uld buckle-up?

  When you sit on a chair, the resultant force on you d/ sqmfh3xx.*h) xl/ nis

  In the absence of an ebvil hevj g*/g4(76:lblfjh 3xternal force, a moving object will

  When the rocket engines on the starship NO-PAINzy2g( vzh33rfopr2 jwn4 z/ ,a-NO-GAIN are suddenly turned off, while traveling in empty space, tfvarz/ gj3p(ywo hz22 ,rzn34he starship will

  A rocket moves through empty space in a straight line with constant spee+yq/n4ta 03.zr 3hmd vjwhd 7yd. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocke+n .dzrh3h0dv tqm/4wjy7 3ayt in order to sustain its motion is

  You are standing in a moving bus, facing forward, anccsg(ykzgzx8 0g+11oi )8 ojwd you suddenly fall forward. You can imply from thisx0+ g(ooiyczw1 8s k)c1jz8gg that the bus's

  You are standing in a moving bus, facing forwarsrtvruhq vvyo:)-v sd8s1 :84 d, and you suddenly fall forward as the bus comes to an immediate stop. What force caus-vsu v8s v)hrqyo:rs8:d14t ved you to fall forward?

  A constant net force acts on an object. Describe the motionbo.i dw 2gi49o)wqw m- of the object.

  The acceleration of an object is inversely vjjt9 0(9 ;o:uhvnhcvproportional to

  A net force F accelerates a mass m with an acceleration a. If the same t.h(3hczitm( avfm,6,a ,n44 re mmctnet force is appli.6m tata ne(ic, (z4mhr 4,3mf,vm cthed to mass 2m, then the acceleration will be

  A net force F acts on a mass m and p)u 3vd s kg/n,ye7fv-qroduces an acceleration a. What acceleration results if a net force e)yg 3sv7qd ukf-v,n/ 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ball9tr7e kjkhpsbl35 (2f ld2*udjivf70oon will fly away. This is an illustrationlvui2t 72 jb(fr 53h07*9kpejsdflkd of

  Two cars collide head-on. At every moment during the collq 9d16/tu6qmdn x0tp0 dj: bnsni/ lyn/7co*z ision, the magnitude of the force the first car eonnscn/dbu/x:yztid9q 166 d tjqml07n * p/0xerts 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 ocxp7 ( f,ro8p rnz;wl,bject, the force which the object exerts on you wifonr; l8wz ,pc,(7xpr ll

  Action-reaction force/tn i*cm7m(q yli.t6 yhh)/xl s

  Action-reaction forces aruf0,dapq-tbqqg8 aa19b ga1, e

  A 20-ton truck collides with a 1500-lb car anagg 43k79tqvm d causes a lot of damage to the car. Since a lot o km7 g349tgqavf damage is done on the car

  An object of mass m sits on a flat ta/x-g5o3cbaasi4 pqe, ble. The Earth pulls on this object with force mg, whics4go-b5 pa/ eqxci,a3h we will call the action force. What is the reaction force?

  A child's toy is suspended from+zkfp.mzbv65)yf3v c the ceiling by means of a string. The Earth pulls dm56bf+fckv z) v. yp3zownward 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 ball pitched to you with a 1500-N instantaneous nk4ozp:r5a9g force. The ball hits the bat with an instantaneous force, whose magnitude isn5o4 kp:a9grz

State Newton's three l3u+ 4 eyy)wr.eldf (tmc6d ,xvaws.

  Mass and weight

  The acceleration due to gravhuma(z v+n2b 9ity is lower on the Moon than on Earth. Which of the following is true about the mass ab(uazm 9n2vh+ nd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which apzp6n h.s o15okiqna: / j3,ohbj4;xq cts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a 9na f*ei*)hmzperson weiginh*am9f z*e )hing 600 N?

  A stone is thrown straight up. At the top of its path, the net force acting - 3qpmimk6hc6e: s(sdon it is ches3i: s(-mpqmk66d

  A 20-N weight and a 5.0-N weight are dropped sisbj87rwxs6q0q8v 5zdmultaneously from the same height. Ignore air resiss xswdb zq7jq 85r608vtance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective te0eplb(am,m uz733pify op33zrminal velocities. Which object experience zz3 eypo pm3(p,m3i70lf3uabs the greater force of air friction?

  An object of mass m is hanging by a string fro (8dw1 /hosiy , f44waqi bs(rinvlb)3m the ceiling of an elevator. The elevator is moving up at co 4(/w,rsi d 4hb3 vnboiql(81yis)fa wnstant speed. What is the tension in the string?

  An object of mass m is hanging by a strif;y utnh,;a.qg,xp o 5ng from the ceiling of an elevator. The elevator is moving upwar qg.a5; p,hy nf,tuox;d, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on f*lwg dkz pw36v(tcwv(z1 l8+an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it lh70o v c: s;pr5cpigbn1wir.(fd/w8 is to keep pushing it with constant d;:8pic 1hr n/orp lv.w5s7 cbwi 0g(fvelocity, because

  A horizontal force accelerates a bo bvhc0eh;0kl/ 31knyn x from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. Whnhb1;v c0kh/ 0ly3 enkat happens to the box's acceleration?

  A packing crate slides down an inclined ramp at conrmwt1h7t, ds vf-5 c2ddgl9v6 stant velocity. Thus we can deduc572 w-l1vcv9frhdtgd tds ,m6e that

  A block of mass M slides down a frictionless plane inclined at an angle q w,qy i)o s4j)pnith the horizontal. The norm )q,4jnoispy)al reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an6.tr dn5uy+ ) x g(em1qjmkqs8s9;/ kc;c jtaa angle q with the horizontal. The normal reaction force exertek+qqms mauged.n5 cr c )j 1jkyxt(s/8 a9;6;td by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclinen5u;npz o 2x4zd at an angle q with the hoz x4nzu5npo 2;rizontal. The gravitational force is directed

  Two toy cars (16 kg :mxnpp ,dl wo*40bcoip cm hh6fo(7y99; j6zi and 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the hb o( x9hwm,pof:imi jy h67l o49;cd0 *cpn6zporizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. hl,co 4t nf08p A 16-N force is applied to the object, a lt0chpon8 f,4nd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massnsaf-4::3lkfd)se. ona2v l d(z kvc 8 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What i3val( k8sodz d : f4fn:nc es-kvl.2)as the average forward force on the car?

  Starting from rest, a 4.0-kg body reacwwov6n0g:e .vt9 h a.whes a speed of 8.0 m/s in 2.0 s. What is the net force acte:g.wao 9wn h0v.6w tving on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires ao7qzf4rgzc:9d6e5o; 4 r4wwlmig6sj speed of 50.0 m/s after tr4q:oelg6m5 z4 iojwgc r f4sz96r;d7waveling
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 push a 10-kgl;;x08p hz,kq9y 7onqd,7zpailm -ba mass from restpl, ip7b8m qx79ka,zloaz - q ;h0y;dn,

  What is the mass of a person who8 ln,.i7uhd, tt*kxrm ui,cf m+lg x.6 weighs 110 lb?

  What is the mass of an object that weighs 250 N on the su/aaq910(duhgnz ov hu. p .z1prface of the Earth where the acceleration due to gravity0u1uaghz(9dvq.p nhz /oa 1.p is $9.80 \; m/s^2$?

  An object has a mass of 60,+1wto ods :bm5 bdw,v kg on the Earth. What is the mass of the object on the surface of the obm+1bd, 5d v:o ts,wwMoon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moon'p1ovpsqb q55; d 1dp(qs gravity is one sixth of Earth's. Comqppo(vp d5q51ds b;1q pare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends oe23c /0jiniz5 tdn fv3f a 5.0-kg rope. Suei3fv3j02dnient c5 z/ pulls 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 a (-9 up*inrpfjcts on the stack, af *prn 9-(ijupnd 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 standor 1xgqa49z wrq71 (ogs on a scale in an elevator. What will the scale be reading when the elevator is accelerating downward aog71z rxgo 1aqq4w(r9t $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person i.j ske+8v7xa,h)uh )xgx )d dqs 60.0 kg and the elevator accelerates downward with an aq .,j s)ax hxe+ukhgd)8xdv7)cceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass o+ a9zxxx lj*d-f the person is 60.0 kg and the elevator accelerates up9xzxa*d xl- j+ward 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 force has a magnitude ofvd(gy r8qovhj by1kr:24-2 jn 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass dg8b2-hkvy q(nv jyj2o:r1 4r?

  An object of mass 6000 kg rests on the flatbed of a truck. qf ro*z:j/bl9r8h: g e It is held in place by metal brackets that can exert a maximum horizontal 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*z:8b9 hqor :gjr/efl forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truipt 8g gju26+fck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truutf g gj2ip68+ck 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 =wkq0fxl +pq8re +-i- u 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction -w-+pqrq0u+f xi k8el and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.4s( y;ucctpfyzzx jz 7d8np(kw*8.e1: 0 kg, what is the tension in the string? (Ignore friction and the mass s8kn*c. yjtz7 pzxzdp1(wf ;ce: ( 8uyof the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a fnan. bls2p9 +xorce of 100 N in a dirnsnpalbx 2.+ 9ection 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 smooth horizontal floor with a fo5m2.u r cmnl *krzh8e+rce of 100 N in a direction of 37.0e r.2lem u *rkzm+ch85nabove the horizontal. If 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 ropes as shown in Figb.xz hma;-ze-. 4-2. What are the tensions in the ropes?a-zb ;e-h.xz m

  In Fig. 4-2, if the tensions in the ropes are 50 N, wh ,to y0yxdii)9at is the mass of the traffic dx),0y9tioi ylight?

  Two boxes of masses m and 2m are in contact with ea,-1fhmp bitqbij+;) rch other on a frictionless surface. (See Fig. 4-3.) What is thj+;bb)1prmfqi ,h -tie acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frvk:n -9xc9bx1peonx - ictionless surface. (See Fig. 4-3.) What is the net forcenecbxxox-9p 9:-n1v k on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.c zs3 f6jc;1h+i7uebp 4-4.) If the forward force on the mors;zh u ce13j+fi7bpc6 e massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by 0s9g wg+9 krkoa rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lesog9rsw k+9k0g s massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5gh1x0 am0ub 1 m(up (r;ppg 5cfky63ly. Box I ou fkc(bu5(10y60am l; mprg13gxphpyf 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 frictions between a 3.0-kg box and a deskc ++llsqgb+)/z-u cb ehw1w2z are 0.40 and 0.30, respectively. What is the net force on the bow eulbc)h+s-qz+1 lb/g2+cz wx when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for 0. qhh 6y4ozcn:h7vv qg;pci4plastic on wood are 0.50 and 0.hov qq07ph4c.z6v:hig4 c; ny40,
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 licditjssxcza-6 u;v/2o.s ( 1he r-6cevel surface in the +x direction. It slows and comes to a stop with a constant accelerati 1ca-sxt; sj2e6rh6ciic.o /-s z(vduon 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 for3b+f f -yrn0ebd /e4mjce. A 3.0-N friction foe 4ybf/d-+enf mbr 0j3rce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rozp/)dux*x sp*) 4tc dest, 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 give;qaorv +3en (-hqv:bgu5 ca o3n an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the con aq;:+roqh 3guv o-ve3cb5 a(efficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, policqi73lg gnj z4,e find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car w3g,q gn4ij7z lhen the brakes were applied.

  Two boxes of masses m and 3m are stacked.9bj7)fy 6o gpyfe0 vt: (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 y) 6e: 9y7tvgfpof j0bthe 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. (See Fig. 4-6.) -c16*-lwh1egv kglm r The surface between the more massive box and the horizontal surface is smooth and the surface between the boxesgv*lg6 er -1whm lk1-c 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 frictionless inclined plane. The plane is3enz35x (slqyrz5(t u inclined at an angle one3lx ytz3( q5 s5z(ruf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thyxw-hd)6ku*vbjjtb/ (fu o) 0at 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 a smoov-u2ik8(ef vjwe fiu;z:q1 -rth 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 smooth inclined plane tilted at an:ucfpd ywcja5;o+smrp 0/w ,6 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, atre q)mjaed* mkl125:f a constant velocity of 6.0 m/e rdamm:*jfel5 )1 k2qs.
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 sle07s;c) skqlz9x2 yo w7xy+kyides 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 m slel;v5nkaxis+h;kh ,)ex( s1m 2pw tcw3b- c+fides 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. The caba0k vjh pn/(m,; jm4yeugs+63/xid fn le attached to the log ma;i34 mkgmv+ynp/6 ashe(nxujj 0,d /fkes 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 wipk0ib6(*v p6)nqpz a rough inclined plane tilted at an angle o*zb( 6pv6w0)q inipkp f $33.5^{\circ}$ 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 inkmnt)w 5w mp4kof:,b)clined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What w k4:pkm)t)w ,f5 bonmis the coefficient of static friction between the object and the plane?