Which of Newton's laws bfb o v1e6ay1;jeky *6) v+pnpe* igp2zl7ys2best explains why motorists should buckle-up?

  When you sit on a chair, the a dfi f*a1uk.,1a t6ybresultant force on you is

  In the absence of an external force, a moving +qz :py*fqqb+object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN *u o2q 9ubd/i7fm8wlbare suddenly turned off, while traveling in empty spa*2mqo iw ub7 f8/db9ulce, the starship will

  A rocket moves througmi;ffxc4qte -yadz(q 60k /1jh empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditiomd6txa-fi k y/;qj0(c4 fz1qens, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movingfw/k j go69hn0(, jfz *pjo3y-gk:v en bus, facing forward, and you suddenly fall forward. You can imply from this thjg*v 9:g,6w(he o n0yffk3zjjko p/n- at the bus's

  You are standing in a moving bus, facing forward, and you suslvqo4 .a9ga+ ddenly fall forward as the bus comes to an immediate stop. What force cau4 ola sgqva.9+sed you to fall forward?

  A constant net force acts on an object. Describe the motionb04amotdk;l 3( tf:4ls pyd0w of the object.

  The acceleration of an object is inversely proportional:0lyx l0 xm2mr to

  A net force F accelerates a mass m with an acceleration a. If thwjqv,l 2r- ( ;rphyec:e same net force is applied to mass 2m, then the acceleration willc,peq -vr(y2: ;jlrhw be

  A net force F acts on a mass m and produces an acceleravm.ni8wp4 i h0tion a. What acceleration results if ap m0n8iv.h4wi net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the bal rv 5g.-:mgo t2 chyhayvv51,wloon will fly away. This is . 5v,m1:rycgyw5hov-hgtav 2an illustration of

  Two cars collide head-on. At every moment duringw)cpepvt20ahp u6m6b 1vgc, 6 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. This is an example o,0cgphwbav6ep 2 6mp u 6c)tv1f

  If you exert a force F on an objd2w:mz xm+l 9dect, the force which the object exerts on you wix2 m9wdlz:m d+ll

  Action-reaction forcbqp/ni f0 liyp1f((oz;z 3i x.es

  Action-reaction forces a iocbpv2o en;s0 e24 3ufew(7g//u zw, yqxs*kre

  A 20-ton truck collides wimh3bssh/6 q49mb bmr 6th a 1500-lb car and causes a lot of damage to the car. Since a lbshmh9b sq r/4b3m6m 6ot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object hn2honzx4 +4u with force mg, which weh 4nzh x+o4n2u will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The do:x1 bfuw3ue+z0ab+ Earth pulls downward onb+oxd1w:a z+f bu0u3 e 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 w-qj ib:s5n7itq/q /y kith a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude iq-i /s7itqj :kynb q5/s

State Newton's three law ,p52bv2mnm wis.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than )jcnypae 7j 1+amci51on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Ea cjm)c1+iyan j p51ae7rth?

  An example of a force which acts at a dtms 84jhnmf(2istance is

  Who has a greater weight to mass ratio, a perc;;nptf7v ,oh son weighing 400 N or a person weighin, ;of;7phtvc ng 600 N?

  A stone is thrown straight up. At the top oir5* c9ufrm l2f its path, the net force acting on it 5ir *9rlf2c umis

  A 20-N weight and a 5.0-N weight9i)43y(s2 k li qbqu:ib 5jo0vvjnpr6 are dropped simultaneously from the same height. Ignore air resistance. Compare their acceleratiov q)iojl pvybs b9(2j4:5in0 u3k6irqns.

  A brick and a feather fall to the earth at their respective terminal viss l dd8;9us*hc(.s uelocities. Which object experiences the greater force of air is .8lds du9s cs(;uh*friction?

  An object of mass m is hanging by a string from the ceiling of an en6/5 woclgoo 4levator. The elevator is moving up at constant speed. What is the tension 546nwocl g/o oin the string?

  An object of mass m is hanging by a string from the ceiling of an elevato8jf airx1og5/ r. The elevator is moving upward, but slowing down. What is the tension in rg/i85xj o1af the string?

  The force that keeps you from sl(*zggufn7z0-1 yos p iiding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is ;mmmsa;k:af (3e9g6 fjbkww2to keep b(ksf:m 93ea wm6kj;2wm ;afgpushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surf lg4 mwly,kqzi)4*j25(uo5syzh . uk hace (friction is present) at a constant rate. The experiment is rh*g l iu,wos zhy).4yk5q(ku 5mlj z42epeated, 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. Thupn1 q3 s(3gimx tpfe5/s we can deduce than3t/e s53pi p mfg(xq1t

  A block of mass M slides down a f2rwmi6 czs/6e6kcmk4/gl:xjcz) 9urj) d: h o rictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the9sk) urjc:z r jo4mw/6l6z)/cgmh6c edx2 ki: block is

  A block of mass M sl a wr hb8ylpwsc;d/(4(rpr8; 5en rf2jides down a frictionless plane inclined at an angle q with the horizo 45r;hrw8d(re2y/bnrsc p wf(p ;j8alntal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined atiri dl3n q*m( l;4ee6p(ked/a an angle q with the horizontal. The gravd/(d64l 3 a( rii;eek np*qmleitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an i:z)d j 3o3o.fdvc k6fbu r8 r)oms4.ifnclined plane that makes an angle of 30e with thes ofr6 r 3 .z)v:cuod4d8.o jiffm)3bk horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied oegbopz* )hy-w7,,wu to the object, and it accele 7 w,e ,oguwob-p*)zyhrates 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 ls94dwok ,jbo 7oa/+yin 7.0 s. What is the average forward force on the d 9s4y7o/ jkw +ooab,lcar?

  Starting from rest, a 4.0-kj 0tu)tma7i9i whs,m/g body reaches a speed of 8.0 m/s in 2.0 s. What is the net for)im 9ah7jtm i,w sut/0ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a spee;c wzk 4hqwyw3 g6(b)ld of 50.0 m/s after l 3(wyz)whbqk ;gwc6 4traveling
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-ld1p+z8vxvfzhnpt0 97 6ew +p:jh m *fkg mass from res71pzv*pf pdlf z: 69vmxh wjhnt+0 8+et,

  What is the mass of a person who weighs 110 lb?0 3wsx(pkw; tqq6 yz1k

  What is the mass of an object th:(czrrt/tc-8s p 7 gcnat weighs 250 N on the surface of the Earth where the accel/r8cpczt gt (r7c s-n:eration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the massm ja .rh0 ckk2kp(8i-u of the object on the surface of the Moon where the acceleration due to gravity is onlych.p j0akr-kum8 ( 2ki 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, ansy u gpdpa1z m8-3 mzj1p2jm86d object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earthsp1pj61pzugdm8j yam 8- m23z's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends o bc1 h d+6e.yhrbb,2kzf a 5.0-kg rope. Sue pulls wic, bkhhdy6r+zbe .1b2 th 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 frictionless surp0y2js sb(bw 1face. A force F acts on the stack, andb0w jypbss21( 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 scalenexfg 424ac w, in an elevator. What will the scale be reading when the elevator is accelerating downw42a4x ,gcw fneard at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 :q fsq,)pph05paz cuj0f)ab aef k* 82kg f q0j ps, u)aqbpf82z0kpa e*5afh:c )and the elevator 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 persony bw)j1ma.9:qvvv 4f4 enh9k d is 60.0 kg and the elevator accelerates upward withw4v 1qed )jkm9an 9f:4h.vbvy an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act qssshw:3(k:y . .oaw 6quevr9on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnrw:.3wvaqe6 :okss .uqs9h (y itude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of o:62 jrutp8m ta truck. It is held in place by metal brackets that can exert a maximum horizontal for:o u2 jpmtt86rce 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 :yytlvdz/d +a3lm )5x a truck. It is held in place by metal brackets that can exert a maximum horizontal fdz) xym dl5+t3 y/v:laorce 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 Fiog nygfv ( pzk r,w;.nx1e250wg. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acce rw1.2gpnk ;wvyf5go(en0x,zleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.8 bmx/ s ce6q:mjq m:e+57kkzp40 kg, what is the tension in the string? (Ignore friction and the map m/ kexbq: +qej57:smck6z8mss of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force owu+w:wyo(v/ cb-31ju mp:h mpf 100 Nj+ ymv:mh-u(b 1wwuw p3p:oc/ in 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 z/ok y2:r axq9elnkwgku .ewq-**n. )smooth horizontal floor with a force of 100 N in a direction k. qn*-we2l9g/ak. ur:*w yz ekn)xqoof 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 box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fx0f xq+ bjn;y4)p4+zxpj g6 cgig. 4-2. What are the tensions fbp4++g nzj);6g0 x4x xjy cqpin the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the u;pnk;3i* ijd mass of the traffic lighpjk;n3d iu*;i t?

  Two boxes of masses m and 2m are in contact with each oth;, o3eyo8vho rer on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more ma8o,3e ;orvyohssive box?

  Two boxes of masses m and 2m are in contact with/y0p hp +0sxibokg 0fbpz,c+4 each other on a frictionless surface. (See Fig. 4-3.) What +b 4go bp00/y ckhp,fszx0+ipis the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a r9qfd3a: d4zx lope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the3d fal4x:z dq9 tension in the connecting rope?

  Two boxes of masses m and 2m are connected byv x8lnzk4hx2* a rope. (See Fig. 4-4.) If the forward force on the more massive box 8*h4xl zvn2 kxis F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running ovt*bucmlco.0bb ) p dcfdgi0w +uz(;7( v88urt er a pulley as shown in Fig. 4-5. Box I od 8ir(t* 7zbc(c;d+tb8gb )cu. u0 wfoplumv 0f 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 frictionoo h6cif27y.b s 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 horizonthf6oyb2 .7 cioal force is applied to the box?

  The coefficients of static and kinetic frictions for plasf4uvw -p;-6k yc(pgif tic on wood are 0.50 and 0.yc;(wp --pk4viffug 6 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 695ei/i( y 3lrglmecr+x direction. It slows and comes to a stop with a constant acceleratiece65i 3gl /r9( lmyiron 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 pullevoye-0 p,,3;nekfysp 5k7 og pd by a 5.0-N force. A 3.0-N friction force retards the motion. ,ge3f0v yp,ynkp7;sek 5o op- What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg me9ck tp: b3f,iass, 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,6x m1gi/k/dxy a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the /ygd/x1ix6 k mpuck and the ice?

  During the investigation of a tn:r/.yh+mtl /d9gr nhraffic accident, police find skid marks 90.0 m long. They determine the coen r/ndgmyhh9+ /:lr .tfficient 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 brakes were applied.

  Two boxes of masses m and 3m are stacked. (Sewefe 45k(bw.m e Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfa5f4ekwbm (ew. ce between the boxes is rough. 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.) wy4f2yeo.if so2a kq g+bov744 w0-stThe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes-. wbo fk4eavg+4s0o22yosty 4f7wiq 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 inclinevp.g +5 6gi g)dcf1/yrkvc f0kd at an angle c +c1dr.kvffg pvky05i6)gg/ of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle*03(jk4;/oa nogno3io pr:o th 6edsj 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 plane with an angle of*2ggi e82avvea ma.a7 $37^{\circ}$ 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 anglyapxi9 ve,5y9/bxi z *e 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 coa,a//hg pjz1u nstant velocity of 6 ha,p1//g zuaj.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 massuii4n h1zh+aj)g r9 1n oc dzzd9(:.dy m slides 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 slidi v q:xgy 7.mkd-gzbh;we 6x86es 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 surface4.,cj.qulvmy i;i,r a . The cable attached to the log .larivu,i .4q;, yj mcmakes 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 incmo 0 z11wu.ji-ppvc.w lined plane tilted at an angle of p-w1u0.o v1j. izmwpc$33.5^{\circ}$ 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 idsyhwz*b kcbl7ydq390i 4gi29e1 +kf ncline is gradually increased d2 +y4l7* qbcs93g9hik eyfkzd1wi b0until 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?