Which of Newton's laws best explains why motorists szbo3haw-+ .zba*a; v mhould buckle-up?

  When you sit on a chaiuos :p/2gzbd pd+k yrim21p/(r, the resultant force on you is

  In the absence of an external force, a mov afx2ytnrwe7vetq17b;a lz;) 0tq 51ting object will

  When the rocket engines on the starste:xa 8ghdk 70hip NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the7a :d0h gektx8 starship will

  A rocket moves through empty k *ndzwn 1) nyq::g.pespace 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 applied to the rocket in order to eyq* :)nn.:wn kdgzp1sustain its motion is

  You are standing in z0eb xlh84p)cdgo lyid uk9s72k6* 0iwwia ((a moving bus, facing forward, and you suddenly fall forward. You can imply from this that the bp0ol9bdx* hzy s w)7a ku2(elk(w8igi64dc0ius's

  You are standing in a moving bus, facing forward, and you s4 noiwi;fes**ei1mvak kaq paj;,5;/ z-v/rduddenly fall forward as the bus comes to an immejwek1; azvo 5aims-eqvi //d, *afpn;r*;4kidiate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe t 1h5bg;/q rkio8b 3sxrhe motion of the object.

  The acceleration of an object is inversely proportional ts.qov 4rkkz:r s(-hyj44n y2 mo

  A net force F accelerates a mass m with an:kk7qa1k kfxt0 t;06 bcheg8czpi h7, acceleration a. If the same net forcebcc1;6 77 hek8t 0:zpktqkax, hfk0ig is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and prci74 4ku.2 hdmhy cvz*x 8ejweu8,-vmoduces an acceleration a. What acceleration results if a net force 2c7 4vk eud-vx4 h*mz hwj. ecy,882muiF acts on mass 4m?

  If you blow up a balloon; 2x3c ;tnhu9fr 33nounizs6u, and then release it, the balloon will fly away. This is an illustra3t;fun3;on nrcu3692 zih sxution of

  Two cars collide head-on. At everynay0rp3 bx mti*7k35f moment during the collision, the magnitude ofk0fp aix*b3nr7yt3m5 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. This is an example of

  If you exert a force F on an object, the force which the object exerts cqvhwh,6 9q4d on you will d v,w94qqhc6h

  Action-reaction forcesm r so/1n3z ,4ou h(nvgupu:1d

  Action-reaction forces , otxa097 z1oos/ui mrd*a,fr are

  A 20-ton truck collides wd qsbdx .wm931ith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is do.1mw3 b9dsqxd ne on the car

  An object of mass m sits on a flat table. The Earth pulls on thisrn)0q cn0 4jz5x6 i60yggu/m 1epcla k object with force mg, which we will call the action force. What is the reactioncuinlr10mnjkp z6) e 406qayg/ cx05g force?

  A child's toy is suspended from the ceilin.i*sa3/amvu oi g g6-jg by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction forc osuj*-aai6g v.3im g/e"?

  Your bat hits the ball pitched to you with a 1500-N instannzbv+48l0 ar.:q f zo)xww/r etaneous force. The ball hits t 0zq+nbeor.vfxw)a4z8l :w/r he bat with an instantaneous force, whose magnitude is

State Newton's three l5 x2(xskjbzsfd/ipyq;j01 vn mv..z)+e-ex e aws.

  Mass and weight

  The acceleration duehl6qwb5.nduikg n m-41 wy 36x to gravity is lower on the Moon than on Earth. Which of the following is true about twg5b1d- wkmx36 46nin . uyqlhhe mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at adnt ah3gtx++yi 5 q:diave31; distance is

  Who has a greater weight tor;1sfjru3 lw.3en n (a mass ratio, a person weighing 400 N or a person weighing 3u;ae(wrnfls 1n .r3j 600 N?

  A stone is thrown straight up. At the top of its path, 5 x:ly(ppcp+mthe net force acting on iy pp+ lxmpc:(5t is

  A 20-N weight and a 5.0zt2k40l8niyh -N weight are dropped simultaneously from the same height. Ignore air resistancez iky4 2tlh80n. Compare their accelerations.

  A brick and a feather fall to the earth at/uhaqd7-/t 5qwkx qbwvp8 :1 o their respective terminal velocities. Which object experiences the greater fph/ -aqqbqw/18v ot :5kx7w duorce of air friction?

  An object of mass m is hangil(zq4i8q5mpbc,0er1micj n t ,- - onrng by a string from the ceiling of an elevator. The elevato noeilt(c 4, ,0jmrib p-qqz1nc5-r8mr is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a stria ,3 qmu5c0aduhsw 2e9ng from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension inu9q5d0ch,as e 32wum a the string?

  The force that keeps you from sliding on an icy sidewao6* yj,.zmc 7bqwu :uzlk is

  It's more difficult to stawouz n(k5+kh /rt moving a heavy carton from rest than it is to keep pushing it with constant velocity, becn5zuwkk h/+( oause

  A horizontal force accelerates a box from rest across yhwnf(. +lnb.b k0c1qion( u4a horizontal surface (friction is present) at a constant rate. Ti04nfkb +yoc nhqlb (.w(n1 u.he 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 f2 )b/k1bihuoz cka)/ velocity. Thus we can ok/)h/2b ac) kfiz1bu deduce that

  A block of mass M slidfs (3nowx q7 akkg 3ou3,jf6a5es down a frictionless plane inclined at an angle q with the haw kgs7 uajf 3nf3ox(6ko5q3 ,orizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane om3f+t zcnt ku3y -3d:inclined at an angle q with the horizontyud+mt: zt3f3 c-kn3o al. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionly pl ,nec6*ij0 jkp4o/ess plane inclined at an angle q with the horizontal. The gravitational force is direc4p*o,i0pjnc6/ e yljkted

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclin:czn8/9 mqk exb/ 5acred plane th8 m:nqx/5 rcebzca9 k/at 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. A 16-N force is0wqxi ..cm nn- applied to the object, and it accelerates n-m.w0.qix ncat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s 12 g+k9lyp9x ) 9haefew)rwvv in 7.0 s. What is the vlx9kwh1v) gyeew 9r+2p af)9average 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. W/r;xxx g) ffy:s ea)6what is the net force s:; xf6)ex f/yarwg x)acting on the body?

  An antitank weapon fires a 3.00-kg rocmd 5kzbv-j .mk;bah5 /ket which acquires a speed of 50.0 m/s after travkm;ja b5z /bhd -k.5vmeling
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 fromq nh3hfok; og 9uq+.z5 re.z53 k hhnq9 ouq;+gofst,

  What is the mass of a person who weighs 1108wxl 0miti, kgy9v)0 a lb?

  What is the mass of an object that weighs 250 : z jcq vxj( s/aram+),c8k7ksN on the surface of the Earth where the acceleration due to gravit,v:j +k)cj acsrs7(/xkma zq 8y is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the objeohd07sdh +nb w*0lhg)ct on the surface of the Moon where the acceleration due h*o0bwgd)l7h+h0dns 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 Moonxa/*g( 4o,hdogy7.kp -pw h2zvx wqm2. The Moon's gravity is one sixth of Earth's. Compare the masses of the dpakgqy-(vxwgopo 2m,w* 7. hz4 x2/hobjects.

  Sue and Sean are having a tug-of-war by pulfmisr(o+ u+wp+ +i(vqdq,orp, )lxu;ling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N fi++svp,o+ od(;q )wi u(mrxp,ur qf+ lorce. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books resob6yu,- 7mj o. lxnr.fts on a level frictionless surface. A force F acts on the stack, and it accelerates al6ybx- fonj,umr .o.7t $3.0 \; m/s^2$. 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 elevato ;z/hk k5mcq/er. What will the scale be reading whenqc/ e khk/zm;5 the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the persidvu w,/unoj8q+ 1 ;-gwh8wavon is 60.0 kg and the elevator accelerates downwardgvd,8 vj8iuq awh;1-/wu o+w n 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 txa m*uqzp4izabbu:ic,1qf80ol0 s 5 -he mass of the person is 60.0 kg and the elevator accelerates ab00q4qu imizpfzc u 518 : *xs,lba-oupward 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. Onuq/oo +l ,*a8rmy7xyee force has a magnitude of 8.0 N and is directed due a8*7q,o ury/m xe+ylonorth. 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 truck. I 0p/mz33pjcxit 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, p3i/ 0pzcx3m jwhat 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 fl .ouwg(f fmi,4e,( xnlatbed 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 oiem(x.n4glf(,u w f,slide forward into the cab?

  In the Atwood machine shown in :yn8)jqcxd yr ;a0a4l Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Igno8);lxyd4yc:na raj 0qre friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0. j b:ofgqi7r(*40 kg, what is the tension in the string? (Ignore frictiongi (*or:bjf7q and the mass of the pulley.)

  A student pulls a box of books on a smoothhwhg1z b+1 w0k horizontal floor with a force of 100 N in a1 wgkb1hhz0 +w 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 ofo k; /0 dt,6q2bsf4vpcx nc0mm 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 thf ,mp4xm2oq/0tb vn;0 6ccd kse box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N iszj5z n +usn yix 9zu(7v;2hq4z supported by two ropes as shown in Fig. 4-2. What are the tensions in tvjiz9uuq;n s zyn4(hz+ 57zx2he ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the- c:k,m zypig8 j0dn0-q;wxh;tkzb9q mass of the traffic lic q:xp0;ym jq ;knz0h- 8 -gk9w,btidzght?

  Two boxes of masses m and 2m are in contact with eac bun:v.r5vp* xh other on a frictionless surface. v *u. b:x5prvn (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictio0qctc fqz4( bizx)c+j 0ty dcz 48vl98nless surface. (Seeccq+ 8vzi00( f484zjlty qcb)t dczx 9 Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If ;x 1c of2s 91fddfiou8the forward force on the more massive box is F, whatfox9i2 11d;d 8usff co is the tension in the connecting rope?

  Two boxes of masses m hk5,5l,ag x g.cc.7uc 1okul;es9bn oand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive box?ko9o5h;kecb ug.cl,l1cgs7,x.u5n a

Two boxes are connected by a cord running over a pulley as shoesh wm:-nr 0g4kso 0)pwn in Fig. 4-5. Box I of ma4-)he0 :rsg 0pwokms nss
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 s458/gh1 ld; n bhbircnr,mw5ztatic and kinetic frictions between a 3.0-kg box and a desk are 0.44 b;8h ,1/d5mblwrhn 5inrczg0 and 0.30, respectively. 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 frictions for plastic*fn,kv0ps j cb .*nvxr6g3 7cs on wood are 0.50 and0*xg fpck7s6n.rvc 3nvs* jb, 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 i/k6 6c-encw4cp fisbv )+2bcon the +x direction. It slows and comes to a stop witskwc) + vfci -2ceo 6nc6pb4b/h 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 pull; ,v/m1giwchos:w w1d4xd4 xhed by a 5.0-N force. A 3.0-N frictixvxs w 114gc:im hhwod/wd,4;on 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 rest, at a rate 4qkenule h1y, 67t4g iof $0.50 \; m/s^2$ 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 sli9u g 7kl:j.yqodes 50 m on the ice before it stol:k.qyuj7g o 9ps. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, polxjh,s19ccbs0lgw0o*f /b l3yice find skid marks 90.0 m long. They determine the coefficient of frictio3*cs syc,9 fb lx0h1/j0blgwon 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 and 3m are stacked. (See Fig. 4-6.) The +v.)4m;enwvag -g dxlsurface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough+ev w dnm gav.g)4x;-l. If the 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 stacked. (See Fig. 4-6.) The surface 9e iyvp(,gbn06 b ijt+between the mn9ie ,ygt60b pbi+vj(ore 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane u v :d.z..bhlladfs+ 4is inclined at an angle of+llf.sz vd.buad4: . h $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of kxbxt1 7tb8/p,jf.6f0f fizn;i. o y g$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plw/rlcd (6zd, w )am;ijane 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 in.*oxh nvf0oe 3,ql w0iclined 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 an inclined plane, at a con egt9 s/ cm8 y7yby.rkk4a;b5gt;xk3cstant velocity of 6k. ec83txk s47ca;y 5r 9 y;gmbg/ybkt.0 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 slides downuzqz 76ue xq(8 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 slidep6 j ( jzx 5x.px3g isau8-t6e(dqp8pqx 9yxr*s 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 cable attache1gz)d jl;q 1 g(pk4alud to the log makes an angle of 1l(;p 1j ku)z4a gqdgl$30.0^{\circ}$ 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 fromg+d1b159fa atg-bj pb rest on a rough inclined plane tilted at an angle opbtjaf gg95bbad-1 1+ 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 incline is 7 lqphkt -m+ fqq1d6-k mk.(dhgradually increased until the object begins to slide. The angle at which this occurs is q. m7f dh6(qdk-l+ .t p1hqk m-kqWhat is the coefficient of static friction between the object and the plane?