Which of Newton's laws best explains why motorists should buckly-z6z ggu0ydwsgh,w i40q 8y9e-up?

  When you sit on a chair, the resultd8mf+bhal lgiss/147f a. 8 ayant force on you is

  In the absence of an exter0kd2ij+kawm q 84 mg68:svkvrnal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAve) vs-iskb; ,* 1z(i1fetmavIN are suddenly turned off, while traveling in empty spti);vevmbs1 v f1-,kz* e (siaace, the starship will

  A rocket moves through empty space in a straight line with constant speed.i 9vl87x k*xcd It is far from the gravitational effect of any star or planet. Under these condi7v cidk 9*lx8xtions, the force that 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 fallk,eev8z/b u01 fo6jzgicn/c.qz w7ynha2,.z forward. You can imp 8,ow,.10ian/venqubc . y 7z/zc2kfhz6z gej ly from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly: kfb2 13d9 rya1uyfii,j ma4v 14kltc fall forward as the bus comes to an immediata9iaum4f bl4j12ki rcftydyv 13k:1 ,e stop. What force caused you to fall forward?

  A constant net force acfuk69b;gw y5q:gmk) ats on an object. Describe the motion of the object.

  The acceleration of an objec w-d/8sbhr- d d6eks*zt is inversely proportional to

  A net force F accelerates a mass m with an accelyp:6k6/n /gm g fybi4veration a. If the same net force is appliey ikfv6 /pgb4n:/6gym d to mass 2m, then the acceleration will be

  A net force F acts o jvwqkfdu:v/, ts kz27:4r i)xwym6v:n a mass m and produces an acceleration a. What acceleration results if a net kv7suxr q d):j,2it:m6f zk/ 4: vwywvforce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly awayzm(szog 2de8w*.-zx3glp ug 8 . This is an illustration o8 gmdz(2 szw3uzx8 -oglpg.* ef

  Two cars collide head-on. At every moment crqy(:ct-ybqj).33 h suj)td 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 on the first. T.yt)br(-s hyqt c3jd 3u ):cqjhis is an example of

  If you exert a force F on k.3faahi95w c.vnx4b an object, the force which the object exerts on you wi.nf9vih bwca 43ax5k .ll

  Action-reaction forc0 w;fshp8ds+hgty5n 8es

  Action-reaction forces * ns-5/sdp,7x v ) wvs;bmvj: fq.qejoare

  A 20-ton truck collides with a 1500-lb car and causep l 97 cot b3i7ld5,zu3mba.zs,0svnvs a lot of damage to the car. Since a lot of damage is d3 ,7a 7,msbz 5u.vzis9plvotcd 3ln0bone on the car

  An object of mass m sits on a flat table. The Earth pulls on this o4m5orx: 9j pklbject with force mg, which we will cao4 p9lj5:mrxkll the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth c(rc v7ryk,suz t+- a,:yy :urpulls downward on the toy with its weight force of 8.0 N. If ty +,y:s,rcckurz yv(:7 ta-ur his is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous 9vmbdox5/ mf 1force. The ball hits the bat with an instantaneous force, whose magnitudedvxbm1o5 mf9 / is

State Newton's three l6z-w;jrkzc cz m/j lm:2c7o+ zaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. q)hh t7.85xo;jfybf ;rj+ 0 ayb3xvoz1y t.edWhich of the following is truotzj7x e.fox3;bjbr)hf1t ; .y+50aydy8hvqe about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whiezs7 ;t3apct irt 6z38ch acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig;s dzo8c(tf39 +(cblwc5swom hing 600(ftwc8mc;5ws + 3od z 9bls(co N?

  A stone is thrown straight up. At the top of its path, the net force acting onl9fly5q 2ssg*8 *ov yi-ro7wb 7iny a1 it i-v5yi agylo198ss7 bf*iy wo* nr 2q7ls

  A 20-N weight and a 5.0-Nwyh7e 6ecx g /vm.,qrpe ti*.izp:nadd6+ w7* weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accetri: ym77n z*p.qg,e+e 6di.pwd wa*ehc/x6v lerations.

  A brick and a feather fall to the earth at their respective terminal velocitieg/tw bj0w/;dp 2j)ldk ame c 57 -vkl,nr4rp6us. Which object experiences the greater force of air frijbwm6 ldcdr e24uva;-5p kk/jp0lwtr7/) g n,ction?

  An object of mass m is hanging by a string from the ceiling of vnvag;i3.ql 7(z: wqe an elevator. The elevator is moving up at 7 qa3wg;nzveql: i(.vconstant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevat q818ran oayiy6.d)eeor. The elevator is moving upward, but slowing down. What is the6yeea y dina)8oq1.8r tension in the string?

  The force that keeps you from sliding on an icy sidewalk istf 6cq 84 qnh2sfvi(:q

  It's more difficult to start moving a heav p8sag j*a(mr gvt6+ ,e+as3lmy carton from rest than it is to keep pu js 83+ms+t pl*me6 ava,arg(gshing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfanx,pd1hit qcc z/9w9ez(t 8 4yce (friction is present) at a constant rate. The experiment is repeated, and all conditions remaw8 (tiz 1dntcqe 94,x 9czyp/hin the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down aqpfqxxz 4i1;p:0uo e(n inclined ramp at constant velocity. Thus we can dip1qfpq;z u4:x e0o(xeduce that

  A block of mass M slides down a frictionless plane inclined a d:b)tcqi 9c40/nazjqt an angle q with the horizontal. The normal reactiab9 cqi4 cn0jqt :)d/zon force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane in-6 izlhsm2pq o o1fg;0 65wx5ffiy6bwclined at an angle q with the horizontal. The normal reaction force w;f s 6i 5op2yi w6fxgh5m1qo- 0lzfb6exerted by the plane on the block is directed

  A block of mass M slides down a frictiibjaqhz) 8:c 2onless plane inclined at an angle q with the horizontal. The gravitational hbzi8jca: )q2force is directed

  Two toy cars (16 kg u: uaik2chg).vbcw36 and 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a stat3 )uc6ugb .hvaick w:2ement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16 wfp:) fl3s4g+ zhbi7n-N force is applied to the object, and itilhp37z f+s w bfgn4:) 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 m/s in 7 ce7 eqd6;.ufa 5mt9se.0 s. What is csa e;u.69qe 7em fdt5the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. 3*x-1zibd ixg o7bnj9 What is the net force b igz x7xob -id1*3n9jacting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed o gqw/ mwheei-+kg)g19, fl bvse 7+8krf 50.0 m/s after +gw i,emew8v+9)g l kse-f brhk1q7g/ 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 mass fropg 3jp2 sedk;rv1 c9 bz4ra.d8m rese 4jppgd;d21 9abskc8 zrrv3.t,

  What is the mass of a person who weighs 110 lb?7g q6 ;/nfcwdd

  What is the mass of an object that weighs 250 N5f(aj t6kb8ok on the surface of the Earth where the acceleration due to gravjt8k o6(fbak 5ity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is thm5jpn uskigw 6fj-3,1h *i: uhe mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on3pw h6hgmnj, f-:uksiui1 j5* the Earth?

  Object A weighs 40 N on 9kxn m54 9ua5z1gkabd Earth, and object B weighs 40 N on the Moon. The Moon's gravity a51 bxua g459kz dnkm9is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rof5q lv6yy5 8bp,j)zd spe. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towar d p5fsb65)yy, jqvl8zd Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frikg/ f /o45jwxactionless surface. A force F acts on the stack, and igw5x aj f/ko4/t 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 a7mqxe)-kz/ r vn9 *k(1dmcph a scale in an elevator. What will the scale be reading when the elevatorzh/)eqm(ar97 dvx-1ncp k m*k is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the perso ituuga q4n.7o*b89z0 k8ps dzn is 60.0 kg and the elevator accelerates downward with an aqu*. 8dks8 pbaz09t g7oi4 znucceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator m0 gx qv6) g *mn*;zlbf1gqtz2t0puv). If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceqm zv 6tz1p )mnxq2;tl0 ufgg0)bgv**leration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act ona3 /o() qaxb-u wu,zjx a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force tab-a)wx( o zuj/q3xu,oward 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 truck. It is heldwrlcsi2h (9 xj 9sgd)3; esgv; in place by metal brackets that can exert a maximum g; cxhliwe3s9r2)( ;s9 vdjsghorizontal 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 flatbed of a truck. It is hs97l/.ogna zm jt(s5lf fy7 ;oeld in place by metal brackets that can exert a maximum horizontal force of 9000 N. W f s77l9agjyt(/;oo.z s mfn5lhen 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 = :pmu;ym7:kwifaf9g:0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignoref:u f:amw9:mgp; k7iy friction and the mass of the pulley.)

  In the Atwood machine shown in Fig.kc l/ 9eif.vk5 4-1, if M = 0.60 kg and m = 0.40 kg, what isl .kfik95v e/c the tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on auik:g wt qqu4.p/jmd 8 3j5wc. smooth horizontal floor with a force of 100 N in a direw:u uw dqc8jmj/.ikgq345 tp.ction 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(sr87onk4 rm x smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of th48 s(romrnk x7e 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 yra, fkfqp 9/iyr7n 1iaw/8 +xshown in Fig. 4-2. What fypa/wq y79 1 ir8n /xiak,r+fare the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the7m f-kf d6wgg .e*eb 1egv7ru q3*td3q mass of the traffic ligem.3u-wv qrg3 77ft1dqdk*fe e6b*g ght?

  Two boxes of masses m and 2m are in cgl v 8r:g p3fgg(i*d:hontact with each other on a frictionless surface. (See Fig. 4-3.) Wg::3r8pidgflgg* v (hhat is the acceleration of the more massive box?

  Two boxes of masses m and 2m areosp3z5f3 x8lc2sno 6g 2umoz. in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive bo8 c6o 3 sgo2.lnfz zmo53xup2sx?

  Two boxes of masses m6orxw j8/;xm0 *hqdk a and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tk6r;axj w/8hmo0 q* xdension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. ( e -:5x 9vups1uxtgw+b 5w/yecSee Fig. 4-4.) If the forward forcv5xu:pbx +c/ 1wte s-yu5 gw9ee on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected b6m)v3 inxfwj .y a cord running over a pulley as shown in Fig. 4-5. B w f)xm63nj.ivox 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 and kinetic frictions between a 3.0-kg box and p7*aqw ptef- j/j 5os59e :jpsa desk are 0.40 and 0.30, respectie: fjo5q7*pwjej /ps5 ptsa-9vely. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of stati.;igmw8p*n po:ti5t dc and kinetic frictions for plastic on wood are 0.50 and i8 imo ;5dwg.npt*p:t 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 surfacexbs-cri8t r;5y-isr9 in the +x direction. It slows and comes to a stop;-s bcirr8sy xi5-9 rt with 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 s g*7fotpe,f+lw9 dz /uurface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the obg+p/ dluow* z7,t9e ffject?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest,ba+ 2hyy :akl) 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 given an initial speed of 10 m/s. It slides 50 o94t 5bfpe; qpm on the ice before it stops. What is the ob;94t f5ppqe coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.hp 9qh4.p+ ty6qr4y 4j3 ejlc2vm3fc i0 m long. They determine the coefficient of friction between the car's tires and the roadwa+ 2pthj crm49lqi 6c 4yjhveq33y4f.py to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (Se0t-o q5 hh*z(obd+g kae 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 o+hgtq- d(z 5bhak*o0 on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are strisq63td .cpd 1q0,ykacked. (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 q06y ki1 .d, s3cdprtqmassive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionlc8v9se 6-pm0 ux urvw*ess inclined plane. The plane is inclined at an angle of 89*u uvwm c re0v6-pxs$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle onc.6 ,8a fzqy m4juls4f $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plane with an 2( b +ob*upbswk *-+hf wop,hkangle 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 a*vtdzq2 pc;6l n 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, at a constant velodiaf;*dsv5ju.w kf 98 city of 6.fd waik9u d5*8jvf.;s0 m/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 s( * lswydzswrf9c7f.(lides 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 slides down dt;40 ftjq9 -rdi y(l1pn5yhq 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 we i+ /tbjw(rbs3ighing 500 N along a rough surface. The cable attached to the lo/br(tws 3j+ib g 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 rou9abqm.i ataejk2go4(32j j .6qw+p jk gh inclined plane tilted at an angle ofjjta k3 2qeo9g.iwaj.(b+4kmq6ap2 j $33.5^{\circ}$ 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 angl0o(2mx-c( r2wum +q fk tyq+yde of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coe((r dqm qmt oxyy+wu+f20 -c2kfficient of static friction between the object and the plane?