Which of Newton's laws best explains why motorists should bucitckm( avvk35 j k wn62ca(6,xkle-up?

  When you sit on a chair, the resultant force on nn)eyvgt)q u;;8 alc-you is

  In the absence of an external force, a moving object with2j,dhj /019 *o nhfh9 ygknyll

  When the rocket engines on the starship NO-Pd7 q-5 pp vk91m++ hihtr/eyxjAIN-NO-GAIN are suddenly turned off, while t tjqhm / xpk19dh5+-7 eiy+vrpraveling in empty space, the starship will

  A rocket moves through empty space in a straight line wit s3g ol1ad4g7zxi fi:m/. jx2gh constant speed. It is far from the gravitational effect of any star or planet. Unde: aojds.gxx7i1fg l 3migz/24r these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus,ny ,pj,6 fp w6f1qf-ur facing forward, and you suddenly fall forward. You can f n- 6r1w,jfu,q 6pypfimply from this that the bus's

  You are standing in a moving bus, facing forward, and you 1bo )ltcj + q6j.uz8t5ai-zma rcv.m9suddenly fall forward as the bus )qjmz-lj.m89aout5cvi+ za6c.t r 1 b comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objec4 jrqv(fr p/9ot.

  The acceleration of an object is inversel8njdao+v (()dny j, mzkg+m 5ly proportional to

  A net force F accelerates a m,x xdwacb)u(lq j7.5mass m with an acceleration a. If the same net force is applied to mass 2m, then tq. x 7l(d5)bucj,wxam he acceleration will be

  A net force F acts on a q.ed :tb5l, et,f qb9nmass m and produces an acceleration a. What acceleration results if a net fortq5 q:,,dtb.enl fbe9ce 2F acts on mass 4m?

  If you blow up a balloon, and then release ip94bqu k j.wz9joq-z6t, the balloon will fly away. This is an iljz o4.p9q-jw96u bkq zlustration of

  Two cars collide head-on. At /:1d-pywt e6g 8gh 8,) z;ohce fritihevery moment during the collision, the magnitude of the force thhr:),8tg8z c6i/h ewe 1of;pih-yd gte 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 which the object exerts on youtdyhb3vtxcb8ng/ :/mnc1i7) wil8v tm1 /yc):7cnnbhgxt/db3il

  Action-reaction forc+czoz:6ry -y /kt r8ehes

  Action-reaction forces are/uc5v rw ) gb/j aduhpotve+. qs22y8(

  A 20-ton truck collide:t/hz.z 3k c3doesz1 qs with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on th:qte3h.k z s3cd zz/o1e car

  An object of mass m sity )byf79ust2y s on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reacusy2y)y 7tbf9 tion force?

  A child's toy is suspended from the ceiling by means of a string. The Eart7vaxk0gi ;cs6 h pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "r6;i v xgck7s0aeaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. )yp*nr o nljd,f ;5+)asn.iopi)3cxl The ball hits the bat with an instantaneous fclnj. xosd,5 fr ilypio+) n)* 3)apn;orce, whose magnitude is

State Newton's three la73qqqc4 u)mnm ws.

  Mass and weight

  The acceleration due to graviji d)cw: aa+u5ty is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfaw :ac)5udaji+ ce, compared to Earth?

  An example of a force ga 3bfvq:/2e-ih :mog which acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N bl*i h fzsx24mh*w*m(x4tjn5plt pf e812sb)or a person weighing lhw z24l5 *(*sxsbm481 e pft*h ibxtfj )nm2p600 N?

  A stone is thrown straight up. At the top of its path, the net forceg2)jz 5kpze uzz 93j0p acting on it i0zz5 3zup e2pg zj)jk9s

  A 20-N weight and a 5.0-Nccu959, g 3xle- ddp0fm xx4sl weight are dropped simultaneously from the same height. Ignore air xsf,ucxl mpdxc-gel 54d39 09resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective termic --s) m r5wq xzutl0a:i*b3w hu.cnm4nal velocities. Which object experiences the greate-)lt-c 4.*s30q5rwb:mmh x uawzuni cr force of air friction?

  An object of mass m is hanging by a string from t2wa;f)5p j gtpq)+0j3 eiqil fhe ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the stri +wp)j5ai 0)2qji3f qg ;petflng?

  An object of mass m isq,j 6f 35pvcun hanging by a string from the ceiling of an elevator. The elej 3cf,q6vpun5 vator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding ohrd3 ognl4r)lvag 71z6 q, w+pn an icy sidewalk is

  It's more difficult to start moving a heavy carton from rejv.1 ielcpub2gsb ( x .)+/ldjzy /,)minq:lkst than it is to keep pushing it wiv(p/edlgs i.+jb1 )/cb ,:y .2zuknljximql)th constant velocity, because

  A horizontal force accelerates a box from resxjfe;,pcqscm )h+9p1v89op- npd 3 rht across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the e3o p; vc, j1pnm h)d9sf98p-xhq+r cpexception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides p)j/, o: hmejwdown an inclined ramp at constant velocity. Thus we can deducejmw,/pohj ) :e that

  A block of mass M slides down a frictionless plane inclined at an angle q wd,inmjj/yp6o1 z j;+jith the horizontal. The normal reaction force exerted by the p+,d;z jpjjoim 1y 6/njlane on the block is

  A block of mass M sli.tr+bcsq vp.,e. e ykj3 *i0dtdes down a frictionless plane inclined at an angle q with the horizontal. The j,d .r0 b+pet.k* vty.qecs3i normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless wf2dc5 x,bn:q+x 8mw/3 ppmqeplane inclined at an angle q with the horizontal. The gravitationalc+f 2wen :ppm3xwdqmb x /,8q5 force is directed

  Two toy cars (16 kg and 2.0 kg) are rem*7glk4 .wih78aec7exo sb 2kleased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make ale *k 7wch ea7.24xg8i7kmobs statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied tou4*,fuo za:j c the object, and it accelerj*:oa cf zu4u,ates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1bn 2u4oi*)fxi 000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the averx2)nbi*f 4oiu age forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.i0cuxdqbb/ an(8w k r6,l.zv( 0 m/s in 2.0 s. What is the net force acting on the(wbzni.8( 6vx0crdb,/k q u al body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s --u jspjl* : 2.a-bvfgl)ime fafter travele-2islpgm:a.bj-fj ) - u*lvfing
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 w rcvp m-nv3d7a94cm0b ;f w1 ,vfgi9ioith the same force that you push a 10-kg mass from rest,vc1 0grd b,ai994p cov;imffw 7m-3nv

  What is the mass of a person who weighs 110 lb?,*cixw .njsv 7

  What is the mass of an object that weighs 250 N on the surfacj z5/jgn.1f ike of the Earth where the acceleratik 1z.ignfj/j 5on due to gravity is $9.80 \; m/s^2$?

  An object has a mass of ;k p0j mml8pvu, ct/e160 kg on the Earth. What is the mass of the object on the surface of the Moon where the accvp tjmumc; ,/0e8 l1kpeleration 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'sjzymxnlyof0d wh2xv 9rj0:* * fs92:n gravity is one silvz0rd0n*2 j:2 s9xo fxn hmj* wyfy9:xth of Earth's. Compare the masses of the objects.

  Sue and Sean are having ac vj3 r2xl7a(r tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with 3 v jr7clra2x(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 acts on tho(ozpa (a;c w:e stack,o(;o wp(:ca az 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 will the scale )rt*b ehv5j*ha 2w+wt. 1n lnwbe reading when the eleb5hw.wn ntl)*21 + evtr*awjhvator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kgfh - uk6o 9l pmu;/jnt:g3nnj;tt4g;p and the elevator accelerau/ 4nku9j;6h jlnpt:g; m;3 tp-tgnfo tes 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 elevator. If the mass of the person is 60.0 d *tjps bf ) rx yu:7abj4rf.8w d4zhx/2ff56ikg and the elevator accelerates upwazf2ru4yd 8xh wt/xdb7ffi*r.jsfp 4j: 6)b5ard 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 magnitsc l+13sh2 lvrude of 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 th1rl lsv 2+sc3he mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in 5 at ,ndboz74wasehy61 -lq.xgpi,t9 place by metal brackets t et9 xz46i7 .1tyla-g,hbwoqnads,p 5hat 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 forward into the cab?

  An object of mass 6000 kg rests on the flatb )ghrjea+ gs,/u9tzi s, 5dl3zed of a truck. 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 time if the load is not to slide fog /ssidz 9,3t 5)urjh+,laegz rward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.4 ,pzal;xlyv5:0 kg, what is the ma;z :axl lv,p5ygnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0;0piw:.gg q 1fr3r5uxx(wkvc.40 kg, what is the tension in the string? (Ignore friction and the mass ofxc.vr:kiw(rf gw51qp0 xu g;3 the pulley.)

  A student pulls a box of book)(g,ay6ek q tyvuwf 4 tla;(7is on a smooth horizontal floor with a force of 100 N in a directy(k ( t uatf qei4)7a,ywlgv;6ion 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 force of 100(f4 k ofir0jj9 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 nor049f okjfij r(mal force on the box?

  A traffic light of weight 100 N is supported by*;swd ey)lfqk ah hiy6 yv:.g.0e3( vy two ropes as shown in Fig. 4-2. What are the tensions in the ropevkgev f6qhy:w(l3.*ys)0 .;yih yd ea s?

  In Fig. 4-2, if the tensions in the ropes aregzd4a p t.)86v 0dlhgw 50 N, what is the mass of the trafg ta04)pz. h lvgd8d6wfic light?

  Two boxes of masses m and 2+.feiba ix7jg po fl:hf q.;zf-7-m z3m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerf.z:a e7zfi7fqm-;hx g-obfp+i3.j l ation of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a i r -fdog(fg h1*m,sd6frictionless surface. (Semdg6*h-i dfr f1s( ,oge Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connect kmr;bb-mq qz3lp6n/ rx pm/*,ed by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, w6rnq/z 3,mbxbl- p* m m;kqpr/hat is the tension in the connecting rope?

  Two boxes of masses m and 2m are conne t7z0 cn(s2z+pba+)nkf8 yyye cted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is +a z0 8(pnfybny)ksty7 +ez2cF, what is the acceleration of the less massive box?

Two boxes are connected by a co2 **n4e1a5dvroi pc(ecjd t 4ard running over a pulley as shown in Fig. 4-5. Box I of ma2d e *544poreida(*na cjc 1tvss
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 kinkjet2ce y8)z1 etic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the zjy12e8 )kcte net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic al7z1 n;bu09c 1r0gf zmbhr 9tfrictions for plastic on wood are 0.50 and 0 0nu1btl7fac10b rzrm;9g z9 h.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. It slows and comes dh yh/,a inr,/to a stop w/,,hdy ran ih/ith 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 isyxy)1 9 nfpcxx*cg9/s pulled by a 5.0-N force. A 3.0-N fri9cx*fyp9)xxcg n1 /y sction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from avqf31g6 / py-q6k: geuzgsd9 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,y ;)- qvz(t.w /dw pavkzg/8rxwdc85d a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before qzdk/(/g.w ;xy) p- cwwzdvdvr85at8 it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks c;(tlajoj* ).ia; qtr90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estilto(ajrtiq j* ;a) .;cmate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m arxcr *u/u+f+mlg4qn5ve 0q cn8e stacked. (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, wha v8ul4e+ fx gccq5/nqr0*mu+nt is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) 0 ; jr8dui.xleThe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough.j.r x;ledi8 0u 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 fricqzxfs+ xn,6q 2/yai5ktionless inclined plane. The plane is inclined at an angle y5xzqx,a n+k i6f2q/sof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mak,ms1az ;q8m * ob)e ostlr(br:es 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 smooth inclined plane w08 fvlqe(s1bd s,ky 4cc-v4wvith 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 tilzydsyfym8 sss(4 (o3hp b/ :)yted 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 plane28lvby+;*h2r 1ygn g v wqgn-a, at a constant velocity of 6.0 m/2rq vvy1y82* h; n-g+ lgagnbws.
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 - * mcaua,gd9pc5 xtlix6hq18 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 slides down alg,. hqa 07hz ogzph22 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 cable attatps-7vuo5,sj+ dfpw5 ched to the log makes an angle odp7 +us5s,vtj w5fpo-f $30.0^{\circ}$ 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 reo5yqm.vgsb 5;w o5 q,dst on a rough inclined plane tilted at an angle of.wvbq 5ds5mq5g,yo o; $33.5^{\circ}$ 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 q5,f1wktenl.z,h; ae incline is gradually increased un.l1n z,hwk5,t;q efeatil the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?