Which of Newton's laws best explais26 jat z1x6unns why motorists should buckle-up?

  When you sit on a chair, the res6fgwkpto h/x y6l5d, xl22m;k ultant force on you is

  In the absence of an externa8x1v5is/ btlp.df 7uh: ,wh tcl force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN a )tmq e325xt)ybne+wmre suddenly turned off, while traveling3n xmq)5)wtb 2+yt eme in empty space, the starship will

  A rocket moves through empty space in a straight line with cotig3 2gx.so;.m,oo yenstant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force 2; t3,iso g.mego.xo ythat must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly -9m :n/anj lntfall forward. You can imply from this m taj:l/n -nn9that the bus's

  You are standing in a moving bus, facing forward, and you sudden*apn ,g )7eqka9f 8mkxly fall forward as the bus comes to an immediate stop. What force caused qfx89*kp a7n)egamk ,you to fall forward?

  A constant net force acts on an object. Describe the motion of the objeuio9.(e* wr vact.

  The acceleration of an object is inixa n i4sc6.g3 3a7pvzversely proportional to

  A net force F accelerates a mass m with an acceleration a. If t.6hcz2eq u9j k-a apn0he same net force is applied to mass 2m, then the acceleration will-hja69q.u02ep zncka be

  A net force F acts on a mass m anduo q:nykgw2 () produces an acceleration a. What acceleration results if a net force 2F yg(:w2 koqu n)acts on mass 4m?

  If you blow up a balloon, and then release it, the ballo2-lr n)qp o 2s9 gfb8mc7g/abb1;pzczon will fly away. This is an illustratin;-8 rslqg op29zpcmb zb 1)/bg2a7cfon of

  Two cars collide head-on. At every x lkok x/rlq8:tq7j7354cdmzdsu4/c moment during the collision, the magnitude of the force the first car exerts on the second is exactly equalc 53d/d:lq8 c kujto4qkr/s4l x7mz7 x 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 objec h-x,c;q+nor3v ,yimcw 6(e vvt exerts on you wic n,v,;ow qm6x(ic +hv3rvye-ll

  Action-reaction forcesk6g.+mjz cmz lh5yx2/y( o1za

  Action-reaction forces ara)t*v:pi*ovo +0hsg o+ - xq+ rysj2ame

  A 20-ton truck collides with a 150l pzs17*z8 +5onk acv+eqv: rp0-lb car and causes a lot of damage to the car. Since a lot vs+vcope+1 :rpnz k *q8laz75of damage is done on the car

  An object of mass m sits on a f9y-dz rf8* ledy w+/hflat table. The Earth pulls on this object with force mg, which we will cal r9 +dzfy* 8lyhew/df-l the action force. What is the reaction force?

  A child's toy is suspended from the ceiling byjp7)o ivpj f:uehmjs (7:o1 a2 means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this )so:ajip o7vpm7f:uejh 2 j(1is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 150/rvm0 s o2o a+e7unp :p+qoyi/(jfj e(0-N instantaneous force. The ball hits the bat with an instant0:smp/(njfe+riqv a o/2uo (jy peo+7aneous force, whose magnitude is

State Newton's three lain ge2 c775xfe4nh0s mws.

  Mass and weight

  The acceleration due to gravi:6nm oqx0v + s5cam0*-clks plty is lower on the Moon than on Earth. Which of the following is true about the mass and weighm q0l-k c0vs* l6po:a+ 5ncsmxt of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actywk9 m2pw6 z0ws at a distance is

  Who has a greater weight to mass ratio, a person weighing 400y 2r7dspsd,d2 N or a person weighing 600 N?yd2rd7 s d2ps,

  A stone is thrown straight up. A/o1v:l dad2 *kh8cq-f y0iwysq 5vp-qt the top of its path, the net force acting on it iaq2 8d: v /qhokvd0*yw5-sp-f lic1q ys

  A 20-N weight and a 5.0-N wb4:3j qfxo fof 1tkggr537pd0nr9k l9eight are dropped simultaneously from the same height. Ignore air resistance. Compare their accelelk5kfnopxqrrjt bg ff3 19gd9o7:043 rations.

  A brick and a feather fall to the earth at their respective terminal velocip6x4zo2xr 5*jzqtp0lvgg d *;ties. Which object experiences the greater force oft;6og4qz lx gz0p*5r pj*dv2 x air friction?

  An object of mass m is hangjmhbw.s4qpeaik5;y : )v5 ,khing by a string from the ceiling of an elevator. The elevator is moving up at constant v:.5jb)k5hh;em as 4w y,iqkp speed. What is the tension in the string?

  An object of mass m is hanging by a stringtd3) ts +rqb-q from the ceiling of an elevator. The elevator is moving upwardq-stdqrtb +)3, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icipde,p(sp9 c 6y sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep r1(kyn tt4kom+31wtor3hu w5 pushing it with constant velocityw myno1rukt53(o3 w t+1rh4kt, because

  A horizontal force accm+e0x o1mld zg 9cy9yq/w 2is8elerates a box from rest across a horizontal surface (friction is presecmq/xow1m9li8 d0zs y g+9ye2nt) 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 a 0pk/a.2luupin inclined ramp at constant velocity. Thus we can deduce thatu2aku0. /p pil

  A block of mass M slides down a frictionless plane inclb g zf(.rz c4w gf0ho-2cau+,zined at an angle q with the horizontal. The normal reaction fz cc.h2g+,ffuo- r0 zabg(4zw orce exerted by the plane on the block is

  A block of mass M sls 3 3qgyq);gad5wysjz h*w0r1ides down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane oq;s0 h3 gyy w r)zsq3*gaj51dwn the block is directed

  A block of mass M slides down a frictionless plane incxviqwav61x92 r kv99b lined at an angle q with the horizontal. The gravitational force ai96 x vw1b9vvqxk r29is directed

  Two toy cars (16 kg and 2.0 kg) are released simult 8g(ix 0bej56kv yxlsa;1w7 kyaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best descrgekak 57(l 0xyv8ywx ib16;sjibes their acceleration after being released.

  An object sits on a frictionless sufgks.q:(e: (n* age+v qu1ouv rface. A 16-N force is applied to the object, and n+f*ea:evuugk:((sq 1ogqv. it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 mgdt 0b-fr c,,ca.pmv ;/s in 7.0 s. What is the average forward vf-g b;p atm.dr,c,c0force on the car?

  Starting from rest, a 4.0-kg b dj 7+gkto kpcw4mr82qg9:uo ;ody reaches a speed of 8.0 m/s in 2.0 s. What is the netk ;+god qtw j :7mkgpu9or8c24 force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 o s p*ou 8v;-7fop8ykdyvv 6 e,q*zlg.m/s after traveo.dv-8p lov s;g*ue*v7 ykq f6,z8ypoling
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 mass fs tl24ue vlsuf nph8rnrrsm 4:-5 o2)6rom res)rvu24ess-utl54 rh m2 on6 snfr :pl8t,

  What is the mass of a per+rrnz+b i78nfson who weighs 110 lb?

  What is the mass of an0k*c 6e1b 4a0gyy/sx 8dqbs lb object that weighs 250 N on the surface of the Earth where the sx/yq0 a40b1ebygs 6l* b8kdc acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg onc 412t 4lgwfrtwe3ztkh) ,vc 6 the Earth. What is the mass of the object on the surfacettc 6t ghelrf,cv)2143 w4kwz 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, anc,s:0g hs)g9qylq 4jk)n u y)qd object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the ok:4,q)sghq n)q0usyg9 l)cyjbjects.

  Sue and Sean are having a tug-of-war by pulling on oppositem1uud0jw e* z8pldyr2(ef c8 : ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acce *2m e8rcfpude0z(8djyw1l:u lerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionlessgxql 4akyj *in0pb 7:uv-a-6w surface. A force F acts on the sabv6x4- lywiankj*0 q 7p:gu-tack, 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 eleo6e6qd,tcci9c)0k rip 0i-ga vator. What will the scale be reading when the elevator iit rc-apeid)koq06i0gc69 ,c s 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 .1icsxl3w( bvsakm/3 kg and the elevator accelerates downwb/i v3cm1w. lxskas3( ard 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 tx *pkiu tg4msa6s1y9:he person is 60.0 kg and the elevator accelerates upward with an acceleg 1xpik6*4auts :mys9ration 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 of 8.0oecx/iu(h ,v tc-u f/0 N and is direc cxt -euv(0,oi/hf/ucted 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 ma gnd5 (ve zf2gut0u.6q7,g mon the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the trg,fmme75 adu(g6.z 0ugv tn q2uck 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 flatbed of a truck. It is held in placeqm n cv6):fcc3 by metal brackets that can exert a maximum horizontal force of 9000 N. When thnvc6c3f c q):me 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 sh. bk,6subw o+vown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleratw.u bbkov, s+6ion of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.rs9z 9)x)( q djw;n-p2txm yjl60 kg and m = 0.40 kg, what is the tensi)-j2p 99wms q)njry zxx(t l;don in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a forcsslv h15re*h1 h;wu; )7yiwg le of 100 N ih; elgyh7luwi1s5 hv s* );r1wn 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 ttdbb 14ag-z*fw3h7d of books on a smooth horizontal floor 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 az1wf -b43d g*td7t bhthe box?

  A traffic light of weight 100 N is supported by t1mq(x gj /opll 3vdn,.wo ropes as shown in Fig. 4-2. What are the tensions i/3o .m(1dlglv ,xjnpqn the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massq ty/o/w5qai;y6f )r1qpf;d )key9b l of the traffic lighlb; f6;wqdpyry)eot/ a5 9y qqf ki/)1t?

  Two boxes of masses m and 2m are in cos -0 brwdct0j 3qi+k6sntact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of tkrs wtqd +3600ic- jbshe more massive box?

  Two boxes of masses m and 2m .zp0xw+l3gualr:a .gx zn26f are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on z2rg.w:0 gna6l3.p+lx xu zfathe more massive box?

  Two boxes of masses m and 2m are connected by a rop0- vuoa;ah5j ce. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting rope aju0a;v h5-oc?

  Two boxes of masses m and 2m are connected bysz2h7f: ;ncq 8cab 6jxpvtq6. a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is tha:86 6qnv bcjfszp2x; cq7t.he acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in e/ np2/38z6bkqv-5pncug*n om0 7mfqaod)gfFig. 4-5. Bomnfdv qoz)pmo7eg*/a k-q/ 5pu 6b3n 0 nf28gcx I 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 andf2,muevm n :a8zp o:;.)vtv bc kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal,mv z2vv. )f8p :mnuea;cob :t force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood ar3nk4xw+ ,mw jie 0.50 and 0.40,jm4i , 3xnw+wk
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 x/9n.f.-+jxa uy z oj.o s,n89rg ifs)1jnnrdin the +x direction. It slows and comes to a stop with sn.ax8,j/x9fzd gyjo.nojfin.su)r +19r- na 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 on4+xcz:j hh v7 mmjkl3)m w:qf/ a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the w:zk)lh mm:4j mcx7 f3jh v/+qmotion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a wuj p++r3ab.m4.0-kg mass, 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 tyl 8 h/1k1tbxamg,kiby :b33is given an initial speed of 10 m/s. It slides 50 m on the ice befk1,38k/i ly b a:g13hm xbbtytore 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 lo,*ece0 1/qioc 2 d,ko8jvim spng. 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 when the brakmdsv0i2*eo,,q1p c ij8/ oeckes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sjcy f ozxl)-;)8gm4 4gi)vrtjurface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If thlij ;)844gv fzyt- grmco) )xje 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 stac:c g6es0rpao *dt5 mn.ked. (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 lessnmeora .g6td0* 5ps :c 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 planezv9lqcjxlmntbc:g,:a3 h8 *ya sr:,0 . The plane is inclined at an angleyvlctc j l38xbnz,: a :0:hrm,*asq9 g of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that h (-b-u7ajf0ga x; y k;)ob0v/qqg iubmakes 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 pfxz 1pbmzv0ur 4mb1) 7lane 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 angle of 8dq,k qb0jpv 9ft -0sw9sd p2m$35^{\circ}$ 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, at k85u6, hpk+uac ,wabr a constant velocity of 6.0 m/s8p c6ku,h buawka5 r,+.
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 fgs jz /pw, v3/sk0o-hv3bcr3m9 x2c aa 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 r+2)rhviqpmw1s+1 0vg6fs0m w:41tz ny nt ixyough $37^{\circ}$ 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 weighc1kwha)u ++fl ing 500 N along a rough surface. The cable attached to the log hfwlc a+u)k+1 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 rough inclined ph r+-cveyme5.*.esr 7h:p r cdlane tilted at an angle veph *+cr -r msyee.c hr5.d7: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 inclinedwpde*0c ;rf 8prdl f70 plane. The angle of incline is gradually increased until the object begins to slide. The angle at wfe*l 8c fwr0r07pddp;hich this occurs is q. What is the coefficient of static friction between the object and the plane?