Which of Newton's laws gs8mqgj)i +* l6a,atzbest explains why motorists should buckle-up?

  When you sit on a chair, the resu6 uz0xc(4 zmxsltant force on you is

  In the absence of an external force, a moving object vfl a8)gsw)7 (meut l8will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tym5w*a ) (,oim ve:gvqc*3 akpurned off, while traveling in empty space, tha*e:c5,* a ymvmw3(qio) pv kge starship will

  A rocket moves through emptya sb)u3,d)ewa mj/xe0 space 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 appli)xea/me ) asbd,j3wu0 ed to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly y3 4 3qtum8f;v*wk :ljse5 ply4p5g ahfall forward. You can imak f*eq55 s8ll4 u:;34 hpgpmyywv 3tjply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenlav rr:) ndnzd q:3;wj:y fall forward as the bus co3wq):nrn rza:;dvj: dmes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe tuvkp-a2121 glx ttp- vxii;b+ he motion of the object.

  The acceleration of an object is inversely pr 6j yq3 ;mmwl;92folr kph5l8woportional to

  A net force F accelerates a mass 6lxbp19gg7uk m with an acceleration a. If the same net force is applied to massg up9lg 7kb16x 2m, then the acceleration will be

  A net force F acts on a mass m and prod), j;jhs8n-hegla u;zuces an acceleration a. What acceleration results if a net force 2F actj)8,-u;j g ;hs lezahns on mass 4m?

  If you blow up a balloon, and then release it, the balloon n6 u*29rijid,main o0will fly away. This is an iln ida i6o0 i2nr,9jm*ulustration of

  Two cars collide head-on. At every moment during the collision, the mag rfvv2jix0x)lc6*yh8 e1zfj 8nitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car ee 061 *8xj8ffci j) hrxl2vzyvxerts on the first. This is an example of

  If you exert a force F on an object, the force which the object exerthj1 a +tqep3d0s on you wildah+p0 e3j1tq l

  Action-reaction forcesyiq/e cc- /5t,tp -ypr

  Action-reaction forclbr n*l m+d2ot2z2ay* es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the cywhw/6g )bwln b1hgs hc +y+:/ar. Since a lot of damage is done on the chhs ncw/16w+ lggb)yb+hw/ :yar

  An object of mass m sits on anbmf , t9f6eg,*hfj clk1kw)8 flat table. The Earth pulls on this object with force mg, which we will call t b,lg kjf ftm 916*w,)nhfe8ckhe action force. What is the reaction force?

  A child's toy is suspended froxyz:gd -cz9a:xsx9 3ohg,n j) m the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "acy9,z3nod:g sc9x)ha x:j gxz-tion force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 150+-e6;y :,s hmyxcbudvy,lzz0w d 4 e6t0-N instantaneous force. The ball h -ezt,ys b,6:wx;ezy4ud+c lhd0vmy 6 its the bat with an instantaneous force, whose magnitude is

State Newton's three laws.j8tino07drf 7zq;-y m

  Mass and weight

  The acceleration due to gravity is lower on puj mbe/x 5u82the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon'sp me5b8uu/2xj surface, compared to Earth?

  An example of a force which acts at a distance huwdas )hrn/u;c75+ ais

  Who has a greater weight to mass ratio, a person weighing 400 N or a person wexp0zlt u,t;*b5sv p7 xighiuztbs;xv*l p 07t xp5,ng 600 N?

  A stone is thrown straight up. At the top of its path, aalm vp()+thkpd1-39c ui +ncthe net force acting on )lauc+hidmta9nk3 p c1v +p-( it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the s3yojrcu y8riis/pl,4f+v+ 7p/(vc oc ame height. Ignore air resistance. Compare their accelerations7,o/3pr/i(clcou jcrvp yi +vyf48+s.

  A brick and a feather fall to the earth at their respective terminal veloci9t+)razx 2b2 6ny 6aettinn:y+(gd guties. d( y x6y6 n:+netar)gt+ti9z bunag 22 Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the c-8i .7rwe4aase6c**ghs aybx x6cd r ;eiling of an elevator. The elevator is moving up at constant8dcyxr s i gx.** sahb6r6;a4ewca7- e speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. The3l3 l5zmgm wp1 elevator is moving upward, but slowing down. What is the tension inl5mpzwg13m 3l the string?

  The force that keeps you from sliding on an icy sidewn hy o1,bs /,vd34kuhvalk is

  It's more difficult to start moving a heavy carton f4 ss oqb) /z5fmp*y2wxrom rest than it is to keep pushing it with constant velocity, beca/zq )x2*omw5pfs4 ysbuse

  A horizontal force accelerates a box fromxypz 89j a8vmcc2 ;rlt 8zoc9-;ij )es 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. What haizcyt8 jc -8oz arepc lv;;x)9m9sj 28ppens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocx:zm(3xd;qe9b*qe r.bhaf(ud 9b* veity. Thus we can deduce thatbbd(9(;q zh*bqd9au:3xe* f x e.evrm

  A block of mass M slides down a frictionless plane inclined at an anglspgmw5/tc5dic8j(s 0 e q with the horizonta/sc(i gpjm0855s dw ctl. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless pl q , )k(oa8u2batllme;ane inclined at an angle q with the horizol(,t8 keq mlu)a;a2ob ntal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides doh.:ow2ydh 0 ur+ze j1ybau i27wn a frictionless plane inclined at an angle q with the horizontal.1r0duowz. h 7y uhba :2yj+2ei The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultdscxc(qn0, 43sif .xtaneously on an inclined plane thasc0cd.x,qtx 3 4fn(is t makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface)9tajq v y(w1c. A 16-N force is applied to the object, and a(cv9jq 1 wt)yit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg ca-9 ns2mv 3,9sou:z) vi aum dya1qgc9gn accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on 9)2avmia9 m 9 s,vd:snuu-gzc1q3ygo the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is osx*j 8mr y.e*4q4p*teer- ba-4*rtje 4msy eq8r*pebx a*. othe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket whic*k 0mukgq9f5 mh acquires a speed of 50.0 m/s afterkqmu09fm 5*gk 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 with the same force that you push a 10-kg masu5f*,g1gyyyg cy 5,sks from rest,yy1s fuy,*5g5 ,cggy k

  What is the mass of a :jked )uy245 ,dekdh ch8w6 gf6ewi8t person who weighs 110 lb?

  What is the mass of an object3 (fc2rko9 b zuel z,wqv:-a dlz.8, -uvshx0d that weighs 250 N on the surface of the Earth whereovb0zu x .ddr,-qhsfl9eu2 z- vzc3 lk8(a: ,w the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the w3l ab)gfy:e.*+v pe4e7a7bro dl ai 0mass of the object on the surface of the Moon where the acceleration )lly 0gwde:b e.3ab iarpf*7 +v4eao7due 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 .0f blp sgt5g6.izkp0om)h6f8 b ole0the Moon. The Moon's gravity is one sixi0mp f0 ohbz 8llte sk5 o..)6g6b0fgpth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by5 yxvfcu0ru yeoh /).qha(lx1pc-b9 kze +13r pulling on opposite ends of a 5.0-kg rope. kax-9+h. 1uxbhz qeevr 1y0c5(lp 3fuy/o)crSue 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 frictionlesdb xcq-:ye5 n8s surface. A force F acts on the sbcyedq:n- x 85tack, 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 elevatk7x3lxg h+h:teqo18 qor. What will the scale be reading when the elevator is accelerating dowx qho xklhqg87+3t :1enward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of ykj.)v ahkawuk j)r 6l:*7bxf:i2li- zc5:io the person is 60.0 kg and the elevatoik 7c :ojjah)r lavklzyi::xb 6f2ku -.5w)i*r 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 elevator. If the mass of the ped j lm2 dqhmxm0ivg(r x(4(;t.rson is 60.0 kg and thixm0mmj(x(qdv;l (2 td4r g .he elevator 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 massyh n0 5g2bh6e0v; +vdchdp/bwrh4: m n. One force has a magnitude of 8.0 N and is direr0 hgn6+h vhw 4pn2h5 bmc/e:;vdd 0bycted 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 tr:o:k )0l uqtk4q e1 aaugf8b;dt3me,m5pf f:ouck. 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 :e :f,f;de50kg:ftqq1 ot4 8oa l amku3b)pum to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a tt*duvev.lr+5.b mx6b ruck. It is held in place by metal brackets that can exert a vxbt+ . lrdb.uv56m*e 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 an3ui28f2zees hl32h taz he-h(d m = 0.40 kg, what is the mlate i8e2hf huse3 h-z2(23hzagnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1,7,fy4/ tly.5wferiq1ca m b:r if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and wfi yf.rme tq,r:41a 5yc7lb/ the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal2-4nahpjv 2vl floor with a force of 100 N inl-2avj24v ph n 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 books on a smooth horizontal rjjgb rt+ -(u/r/5ejlj) ): bvado .mqfloor with 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 on the tb/ er)rmlv5rjj) g.adjoj+u(-b/q:box?

  A traffic light of weight 100 N is supported by t zm +18rljhzgpy wng(xi,7 93bi2yi(qwo ropes as shown in Fig. 4-2. What are the tensions in the royi9l1 zm8 (wzn 7 gixp(rb,2j+ygq3ih pes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the t *+c(t lwou2jxndtb;nr* cu:7raffic li r2t ;+ tudno( cj7lu*:n*wxcbght?

  Two boxes of masses m and 2m are in contact with each other on a frictionless s edk3g:cy,mlk2 )6af eh3f dm4urface. (See Fig. 4-3.) What is the accelerah2 afd3,egm4l)kfym36k:cd etion of the more massive box?

  Two boxes of masses m and 2m are in contact with e(1 k3 6wdmm wi+0yoetiach other on a frictionless surface. (See Fig. 4-3.) What+60ow1 imi t3wmke(yd is the net force on the more massive box?

  Two boxes of masses m and 2m are ofy 8nku .f/t5biq :3wconnected by a rope. (See Fig. 4-4.) If the forward fk8qt.n y:iwo3ub f 5f/orce on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connec;d1akps.n0e l ted by a rope. (See Fig. 4-4.) If the forward forckl de1apn.0s ;e on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4fw j04 dyjm)v09 lcct6-5. Box I of w4 0 6jvcd mlt0fcyj)9mass
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 betaxq j/ds ;n,ifb:n+h,z:ha 0uween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the x,n0;qf+ni,hada j /u:s:z h bbox when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic o/l sdm 0yalp46n wood are 0.50 and4 0 /pydl6lmsa 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. It slows and come8k:vf q.f/wfz tkgojhh-* 1 3hs to a stop wit hhkfhj :zf w ovtf8q-g*/3.k1h 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. nmeg j ,v.6bjn46z 3op A 3.0-N friction force retards the motion. What is the acceleration of the objez 6mpbogvn,4 e. n3jj6ct?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate ofh eedee..9 (co:wbii 68 vuf.b $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is ,4nm8hs cae7pgiven an initial speed of 10 m/s. It slides 50 m on the ice before csm eha84p 7n,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 90.0 m lcw21c ip6 82 zbimktabc/nae/ nk)2.mong. They determine the coefficient of fri1pcc/t i 2n8 abeizb2a2 /m6.)wk cnkmction 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 a1rw 3sun3 m8z znsi+3jnd 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 massive box does not slide on the more massive box, what is the static friction forceunzz +33w mins831sr j on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig.se 93)wvhu -sc 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxe)h3w-c esu9sv s 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. +qn1r mp3/zut,ji7r qThe plane is inclined at an angle rp7r,+ zt 1n3qq/jimu of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes-kbsxcs,t .0dt3 uq1 r 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 play;d+) x1k -kg/pif-sv gvllypv)z+. rne 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 inclx-u. 3 jfr bgy-b5iuw8-pe7n mined 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 ace)en evbna oun: (0.;0 dbgnofv 5*x+n inclined plane, at a constant velocity of 6.0 0(.enxu;f5voe navnb db*c)+e:0 ognm/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 raul1z/*0p. fkj 9nl6 s,naglih j8; ,mysd1bpough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m srr8 gyr+nw n-;g15tuhlides 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 cab+d2nt zq:7gi 2vv /wm)kmle o9le attached to the logi tqdz)/gevo 2ml9+: knw7 mv2 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 rq9p8vn,0 q zjz s7ysg*ough inclined plane tilted at an angle of gss8*,jq z0 vnq7z9py $33.5^{\circ}$ 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 angleq,fafjfabt*:han3 d/8jmbz+e q0:o9 of incline is gradually increased until +*jb3oazfqh ,ma8 f:/9n0 a jdb tfqe: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?