Which of Newton's laws be) dfjow 7:im1mst explains why motorists should buckle-up?

  When you sit on a chair, the resultant force on you) 5,pf(l pduu52lhj ksg f1yh/ is

  In the absence of an exte9mgzi: ,pidjfs-7ihki1 y ::zrnal force, a moving object will

  When the rocket engines on the staf4b vfmxf vd* d7,+s,n*v y:m wvon,uo 8)e+zirship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the sn,*z8+)4v bvd oou:x+v,m f ,ved7nf* f ymwistarship will

  A rocket moves through emp)ua;i e(so6) atsx(urvmlh* ,q 3cuq0ty space in a straight line with constant speed. It is far from qh0qe3io(6), t*a(; susuamcr)luvxthe gravitational effect of any star or planet. Under 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, facing forilk-c.1uaf br1eo7/ eadxc) 9 ward, and you suddenly fall forward. You can imply from thilakx) db.r1-7iueoa1 fecc/9s that the bus's

  You are standing in a mov)m 5sfu(o .phging bus, facing forward, and you suddenly fall forward as the bus comeh)ugp5(om s. fs to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an ogu*2fee it;-abt,a26 s(q f vj6fzod2bject. Describe the motion of the object.

  The acceleration of an object is inversely proportiona;t r2nomr3 bg1l to

  A net force F accelerates a un l cegv:8f0+mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleu:l +gfv8cn0 eration will be

  A net force F acts on ,jvcmvg5 c:ddxs5 i .4a mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mac., d mdvs:x5c5ig4 jvss 4m?

  If you blow up a balloon, and then release it, fn gc-kl9n y87lfi ta5(v)rtwy2ap )3 the balloon will fly away. This is an l 297w i5vkl n8cp ag)tty)-3f(rfynaillustration of

  Two cars collide head-on. At every; ex4 u0/ffgey moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts ygue fxf4/e0 ;on the first. This is an example of

  If you exert a force F on an object, the force which the object e5a ipic9ux.(r .9rw dy:a2iyjxerts on you will ai5.cypix2r(ydirwuaj9. :9

  Action-reaction forces,4ffe25o2bxv) izk i g

  Action-reaction forceejh*cm0hb: y: s are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to th7fx.j/a0r 8m 4l;vj1 qfm xhage car. Since a lot of damagx1qj8 mfaf7m;g h4axj/rl0 .ve is done on the car

  An object of mass m sits on a fltt+*9f tpv,djw6zrk 40oh+ -mi : bytwat table. The Earth pulls on this object with force mg, whit +,t w-m4wpbkizvttd f0+yoh* 9rj6 :ch we will call the action force. What is the reaction force?

  A child's toy is suspended f xvy .ioh/wp49rom the ceiling by means of a string. The Earth pulls downwar9.o hvyp4/wi xd 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 instantan2l*ej(treck 0 eous force. The ball hits rc*(e k2ltj0ethe bat with an instantaneous force, whose magnitude is

State Newton's three lab2-8nty -ac c q*l3 eh-e+eoh-b2 uwdiws.

  Mass and weight

  The acceleration due to gravity is lower on the Moonx d*k;+am/w9jufada9 d //cgm than on Earth. Which of the following is true about the mass and weight of an astronaut on th kaam+9j/ d/xa cgu fdmw9;*/de Moon's surface, compared to Earth?

  An example of a force which acts at a distance isa bq16skq+ .26 n)mors zjq-z cu.:cxm

  Who has a greater weight to mass ratio, a person weighing 400 N or a z d ox0aoz+wi+xhp* fr k7k4))person weighing 600 N? )xio)wokpf0 a+kx h*+d4zr7z

  A stone is thrown straight up. At the agqb3ujy 724 /sm ccp-ijzg ;*top of its path, the net force acting on it iu bc*ps z74q /3i;g2gyjm-jacs

  A 20-N weight and a 5.0-N weight are dropped simultaneously from y4er9h*+ jd hlkqw3(athe same height. Ignore k4lw3 +h9rjeh d(yq* aair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respecipkye m3;u0)ftive terminal velocities. Which object experiences the greater force of air fu)eki03;yp fmriction?

  An object of mass m is hanging by a string from the c q5ygzgxy /t/y;vee zr,j4u568vwc j; eiling of an elevator. The elevator is moving up at constant speed. What is the tension in the stye //zgv6e;xg,w5cy;t5u4y8v jr jzqring?

  An object of mass m is hanging by a string from the ceiling of an elevatorcmw- v-h92pe2 xt5:q iio(gwtj 3rz7a. The elevator is moving upward, but slow-m x o qptetwh i-gjza93wi:c7r 2(v52ing down. What is the tension in the string?

  The force that keeps you from sliding okco. v21)6(xh25azjp tztsg pn an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest qq5m u1fog, 7cthan it is to keep pushing it with constant fcm,q q1u5g7ovelocity, because

  A horizontal force accelerates a box fr7 *df;ip a)3dgyky3w gom rest across a horizontal surface (friction )d;7yak3pggwfd y i3* 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. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. io,1cpdn:h,np m9 r 5q 9ypxh7 Thus we can deduce np9nh7 hyd, x9:i,c1poqmr 5pthat

  A block of mass M slides down a frictionless plane i--2 83 ( f v18n y4pk0pemldspusnfvqcnclined at an angle q with the horizontal. The normal reactl 8p nf-k sp2v084- ds1(ynfecqmpv3uion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane q 14 lq)3ucs powniv;9inclined at an angle q with the horizontal. The normal reaction force exerted by the plane onvu9;q 1ws4p ol)c i3nq the block is directed

  A block of mass M slides down a frictionless plane inclined at an angl m d3xe,h7vd7fvc n -4ndnr- 12u*yueee q with the horizontal. The gravr vnemnh*d-u 7-dfed4c 7ey1 x,n 23uvitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on t 7e*3fg( 0+hucuwed ran inclined plane tdwu g (cfr+e*h0e7u 3that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionl q h:y,blzn9,fsyaz69ess surface. A 16-N force is applied to the object, and it accelerates sf6 y,z:lnb9 z,hy9a qat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s-ms( o.japduph 7:s9o in 7.0 s. What is the average forward fo9pd:j(uao. sh7mp-s orce on the car?

  Starting from rest, a 4.0-kg body reac1hbl/sw3 kxg2cpg)prhtd :5 - 0t dz-phes a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?3tg -/tsl ) bpkcw0x:5-d21rg hhdpz p

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m 7.g9mu6j-r.cg a z7bszm9z dvv-b7st/s after travelin7z.basgc7zsjvz mv -b97 mr6.u9gdt - g
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 witduhx16 9r. lfz ci04ru)-sw fvh the same force that you push a 10-kg mass from rer1 d0 vil rx-wz)sh9 4cu.6uffst,

  What is the mass of a psawt86:ku.z 2f9krr aerson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on th-.;/hnnig ,nfb+c*gwy7vl b porc1 ) ze surface of the Earth where the accelerationo.wyc 1,*+/h7p; vb-ngg cbf)znrlin due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object oj4tvmf9* 0 um6uisa0q n the surfacemv*js0u46 0qau fm9 ti of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and objectu 4+(p-jxfnnpv fb df;z,*qx, B weighs 40 N on the Moon. The Moon's g;zvq-* 4nxpb d+ n jfufx(f,p,ravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by puplke 5u i; ds+dw8zb/5lling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towibkw8+/spu;dl z55e d ard Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A forhb sr.7jtl rz,8r7+zwf 43hk mce F acts on the stack, and it acb,jk3 hr+ z 7tw smhzr.r4f78lcelerates 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 480r 48imzg3lcrr r44 ,ycv )4sre N stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating ,rym4rgse 3lrc i v484zr)4cr downward at $4.00 \; m/s^2$?

  A person on a scale rizcblz-p+p + 2fdes in an elevator. If the mass of the person is 60.0 kg and the elevator accelerap 2c-l+z fp+zbtes downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale r9zt9x b8 i;ervides in an elevator. If the mass of the person is 60.0 kg and the elevat xe;i9btzr8v9 or accelerates 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 iw d dfkye-61+9n/f) fp8jtztmass. One force has a magnitude of 8.0 N and is directed due n ydfp916end8k -w+t)jz ft f/iorth. 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 thei e l v6ck;s0rwd653h b8m(qsn/tggg) flatbed 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 st(s66hg3;/m g8dve riw5bgnt sc 0kq)l opping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on theyk lv e.,,m8)0qu30fg ft ofre flatbed of a truck. It is held in place by metal brackets that can exert a maximutvuk)m03frq.8 0f,f gyol,e e m 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 8+ vw2-(pacd jsfw xyhacb-w,k*kesn 8d*5m; in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ig p-dy+a j8mhskw2-f;5 8d cxcnw*s wk eabv,*(nore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 j s,5/o:na7ln 3c a7c2lh e zso0gu5zckg and m = 0.40 kg, what is the tension i7,l2c:c 5 5elg/zssj7 ahc0o3a onnzun the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floo)o 4mie4d dk1hv.s h+rr with a force of 100 N i4 )h+sk.r4v 1mdihoedn a direction 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 booksmiw 2+b ;3yi3.pvtosi on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass oipmw ivby2i.3s+ t3 o;f the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weightk,e8;vn+(gch+ jj je jgy hz/2 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rv j,ey(hnjkc 2zej;ggj+h8 +/ opes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what isqaw on10,kqz6sw( z,l the mass of the traffnq(1 6o,kwzwqs,z 0laic light?

  Two boxes of masses m and 2m are in contact with each other o;/ l-pukjm ee 5 v-a8z21enfx az:wvt0n a frictionless surface. (See Fig. 4-3.) Whatj/amwvn:2xvezk ;u- e0 tlz - ap15f8e is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eac v+*f9uwyo90x irvu) oh other on a frictionless surface. (See Fig. 4-3.) What is the uoiu90w)+orvxvyf*9 net force on the more massive box?

  Two boxes of masses m and 2m are connected by a 2v zt4 )p.fn*;dgcakkd,;o pgrope. (See Fig. 4-4.) If the forward force on the more massive box is Ff;*cok .gv24n )tzp,;dkd gpa, what is the tension in the connecting rope?

  Two boxes of masses m and 2m arze en/vsy+t .eir7:n5ihc7) de connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelera)e n/.7 zdsehyre i5:nc vt+i7tion of the less massive box?

Two boxes are connected by a cord ruhqd..r 2xc wk:nning over a pulley as shown in Fig. 4-5. Box :ckd .rxq 2w.hI 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 kiq8 /) spvzjm ui+ms2 s8 q9i1dfogd59unetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively)u99ziv85qu mdso/8ss+pd f qjg 1im2. 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 fricop 6lf leq2:(jtions for plastic on wood are 0.50 and 0.eljf( olq 2p:640,
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 yy:u .2y3*xa:dve wsfa level surface in the +x direction. It slows and comes to a stop with a constaafw y*v :yx2ud:se3.y nt 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 surfacsx;4dek /e ql p3f)up-e is pulled by a 5.0-N force. A 3.0-N friction force retardqp; dfe/)px kl3e su-4s the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg masn ,1:jdmkb7le s, 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 z suizef7 m0nn9cgok:70 )gm7t:3ga xis given an initial speed of 10 m/s. It slides 50 m on the ice before it sto ga k7 u3sg79z0c):7:efzmmg0 xnoitnps. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks w due/fk vtj 5i-+v8s-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 speew8k e +vj-tfs/u5-di vd of the car when the brakes were applied.

  Two boxes of masses m a)m; jrk sm(ga,,cpxo(nd 3m are 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 massiv,ko(,) a;c(pmsmxgj re 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.) The surface bml jdcxs/ y2-2smtvfe.j4) ia eve*1l0hq i (/etween the more massive b(mi/42 sde)jvq.c0 tes yil 1j/xmfhlv a*-2e ox 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 between the boxes?

  An object is on a frictionless inclined plane. The plane is incl 088(klhl70iwpfmyz nined at an angle 0l(zwi h k70fmn8p l8yof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes (acf*b cizb yo (lby1tl)i:86 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 pm7/5bp7ya*. *tepadf fv p+ y,lsqd-wlane 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 plrirpp 1 xsxw9 lj:wkd2735w+jane 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 incline4jw0o3 o8wbql d plane, at a constant velocity of 6.0 m/s.o4 jb0 q83loww
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 do9 l8ai/t fn* lx6m*p y.r0cvzawn 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 a rc,wmp32mp6 qtv z.)mp ough $37^{\circ}$ 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 weighmz7gat p(jp. 3ing 500 N along a rough surface. The cable attached tgz t ma7j(pp3.o the log 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 from8dl3 7-x3x( enor+c kw7qfbp r rest on a rough inclined plane tilted at an angle oo3e kcqnx77+8(rfp3l rd bx-w 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 inclined plane. The angle of inclin vu9*3z3rfx:u ysw: kve is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction betwek*u:zu9fx r wvsv3:3yen the object and the plane?