Which of Newton's laws best explains why motorists should buck4( zue *vqqfi fvda3*n8k8( lzle-up?

  When you sit on a chair, thei8v vt9e-v dvya98 0lr resultant force on you is

  In the absence of an external h awbc:2h km62force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sud u vysi1nh;+.mxfaxm vvikr s;m:-- ;;denly turned off, while traveling in xu;- xkfvhmvvsmi.+-1mar; yis ;n: ;empty space, the starship will

  A rocket moves through e ::sn qqi2,mvh,. y 5xlj dqi.d3-7ckrd f+qffmpty 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 appd- qq5.yf,fq+ircijk v :q. sm2d:7n x lh,3fdlied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you v)zzp9j6+d b dn6 iq+ vncpq8(+gh, zz(.lbqosuddenly fall forward. You can impgz + (qvzzhnbb6q )+cnpilqvd9 o.+zd(6j,8ply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall foslt9jm6uxdc72l p 4k ;rward as the bus comeu mxdslj9t7;6lk2 pc 4s to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an p/;irydtz8r2object. Describe the motion of the object.

  The acceleration of an object is inversely proportionalx c/ d07wjj4zay/xu-dr( xkz9 to

  A net force F accelerates a mass m with an acceleratqj9yu:iupzbx3+ ,0d :tkj5m tion a. If the same net force is applied to mass 2m, then the acceleration will be qub ut+:ki0,d:p 3zjy 9txjm5

  A net force F acts on a cz 6)pmjg6x b/isp4 s+mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass 4s64 bp i6m)p+scxz/ jgm?

  If you blow up a balloon, and then release it1v)sz;3 3nqrht8/xcv d6:c ydrajw(u, the balloon will fly away. This is an illustrna) 8/: 3d vj3chrt yx ;cd1qz6(swuvration of

  Two cars collide head-on. At every moment during the collision, the magnitude oq4x*nioym g 2gexfm ucl6x)63w ie6 56f the eiw ci2umo 6e *46mxly6gxn)qx3 f5g6force 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 eu14 n 018v/1oe k;znol i9;etojttccfxerts on you wine okl8;e ;1cotn/vf jt91t04 coziu1ll

  Action-reaction forcyi)h/cgjhf 0l/ni/d 2es

  Action-reaction forcestdhd2 , q9hvx/*0x sqa are

  A 20-ton truck collides with a 1500-lb cas zzwo61rj,o t,cyd ,0j,+vm fr and causes a lot of damage to the car. Sinceor, 0ds1,jzoyc ftzv6+m,,j w a lot of damage is done on the car

  An object of mass m simpacaye2+9lsxwz qk*.5l /o7ts on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction w2 y5m q9+axl*zapel/o cks.7 force?

  A child's toy is suspended from the ceiling by means of a string. The Earth puj97 y1d ptn*inkv-nx 7okjs +5lls downward on the toy with its weight force of 8.0 N. If this is the "action force," sdy9k xtkn7+pijn1 7-v5*j onwhat is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N i9b8s9adi;pvb;q-ej gv ced7+x(; s k fqel:. fnstantaneous force. The ball hits the bat with an instantaneous force, whosbe9k; bgaq scfeeqds; p;j vlv8:ixf+ (-7.9de magnitude is

State Newton's three law/j65hqfnlyb wim b )d-ck:3(j s.

  Mass and weight

  The acceleration due to gravity ivg0wrg5pl(b/ s lower on the Moon than on Earth. Which of the following is tru 0pbgw(5/r lgve about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force: cxobw8l88pj which acts at a distance is

  Who has a greater weight to mass ratio, a perse5(va1 +lk m;l o(qb-duixz z7on weighing 400 N or a person weigh;(+1xvo (l75z km ziudaeq-bling 600 N?

  A stone is thrown straight maa,2 ha8j8h2n. w7lydi3s hf up. At the top of its path, the net force acting on ia3hl ,hhswi72d y.a2jf8m8an t is

  A 20-N weight and a 5.0-N weig- yr3mz,htw ah mn:,l4ht are dropped simultaneously from the same height. Ignore air resistance. Cy-,hwzmt an4r m3:,lhompare their accelerations.

  A brick and a feather fall to the earth at their respective terminal v:,xwct mj9v /eelocities. Which object experiences the xtv: me/,jcw9 greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elesfu-rdo 6e: (bvator. The elevator is moving up at constant o-sbfrde6(u : speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of a5upidvyso)*e 9 g t*x:n elevator. The elevator is moving up ediu:*g )5s*9vpoyxt ward, but slowing down. What is the tension in the string?

  The force that keeps yous7s99ih1ra hp* ,sz awu+y.mo from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton fro; )mk( q3mwfgk -*pzmfm rest than it is to keep pushing it with con)fw gkm -*p(z;fqkmm3stant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfujpl8k usw *:i1mt2t gkdw24 /ace (friction is present) at a constant rate. The experiment is repeate1ug* /tw2kp:4 2i8mw jsu dltkd, 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,ldujf0g /7e ccy:/lyx/ ;w 9xsmk6kg velocity. Thus we can deduce thatf ,k /uk6ge/ywy/xclsx07mj:d9c l;g

  A block of mass M slides down a friwjh5bbm61k yqr1 46cnctionless plane inclined at an angle q with the horizontal. The normal reacbqj m1y6hcwrkb4 61 5ntion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined xgpsz.wcj5c)f9 1dikk9,/yk at an angle q with the/c9sy9,f 1 jpz)kkcgxw 5d.ik horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incl y2 zn9,cm9h6lh;ix voined at an angle q with the hori,il ;zhncm92o 6vx9 yhzontal. The gravitational force is directed

  Two toy cars (16 kg wlbm0c o09/yaand 2.0 kg) are released simultaneously on an inclined plane that makes y09 wboalmc0/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 gqrxll-.78b by; hq 4eis applied to the object, and it accl4.rgq hl b-bx8e;7 yqelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelera. 6/;fvjyqfmjkz:vs/ qt81s jte from rest to 27 m/s in 7.0 s. What is the average forward force j81 yjf/qv.tz:6qfkmjsv ;s / on the car?

  Starting from rest, a 4.0-kg body reaches a speed ozg;a:m y5zb-p1hd lw9f 8.0 m/s in 2.0 s. What is the net force acting on the body?bp95z a1 ;-gw mlyhz:d

  An antitank weapon fires a 3.00-kg rocket whiad( gd.cbi )j3 lj(xv/.u5tdkch acquires a speed of 50.0 m/s after travelinb (.ca35l)k / viu.ddj gdxj(tg
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-l 5fn7(m9 qg)m1by1t q. wygri6t5fqu kg mass from re9. 1 imyu6tqwg7q fnmb )5tqlr (1yfg5st,

  What is the mass of a person who weightio9t))q h.;b 5un hpds 110 lb?

  What is the mass of an object73zj t cjc-.vt that weighs 250 N on the surface of the Earth where the acceleration due to 7zj vt-cj.tc3gravity is $9.80 \; m/s^2$?

  An object has a mass oo mxn ns5;.yi-r5va4 abe: ad5f 60 kg on the Earth. What is the mass of the object on tam55v.-o:exy ind 4a;rn5sabhe surface 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, and object B weighs 40 N on the Moon. Thev:/.y :jo r9xru ai4zs Moon's gravity is orjirazv :x oyu:9s/4 .ne sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ew y 4jpy/n h*ad-/z5bqnds of a 5.0-kg rope. Sue pulls with a 15-N force. Whj/a5*py-wyb/q nz4dhat 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 surface. A force F acts on the sbz2z mt8o+he3hz.2 p ./qcq5;iabw bdtack, a/zocqz ph..td5bba e+2m qi;zb8hw23 nd 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 elevator. Whey g vn m90 v/2wdo-7g6bc*u0ik gm4mlat will the scale be reading when the eleykud9mn* vlv w/-m4gg06cm0ig2 ebo7 vator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the fe0ftij0b 8w 1mass of the person is 60.0 kg and the elevator accelerates downward wit 1ff00wi t8bejh an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridesqr2cq +sricic w:xz f:xl9+.6 in an elevator. If the mass of the person is 60.0 kg and the elevator a6zxf2:rccqswc+9ii : lrxq+. ccelerates 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 mass. Onbn4z,:7tb urae force has a magnitude of 8.0 N and is directed due tub b47r:a zn,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 truck. It is held in place (rs,t tu qr4b3by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the r ttrbq(su34, minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on t qe6 be gpy+wx-;uylwn 42r)2che flatbed of a truck. It is held in place by metaw ;ge4 e)nx-2b 2lpyqc +6yrwul 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 slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M p3.y;ua7stevwc 4km 4= 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frics.mwk 44ytcavu ;pe3 7tion and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 k;i3kl jeq(: imfxnh2: g, what is the tension in the string? (Ignore friction and the mass of the pulley.) l: i;x 3ikhnqje(2fm:

  A student pulls a box of books on a smooth horizof*6b8 vo3yo8 nwepir9ntal floor with a force of 100 N iro pn 96y8 bi*f3e8ovwn 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 floor with a f4; yifmlv 48p y4(6camym+trmorce 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 forimmmf+p4r vy6y84l ;atymc(4 ce on the box?

  A traffic light of weight 100 N is supported v/v mn;uy )simjc0n-7by two ropes as shown in Fig. 4-2. What v;mmnc)0uin- 7 vyjs/are the tensions in the ropes?

  In Fig. 4-2, if the tensions in th t5os+lk1vh( r.5 qpgeny* ry;e ropes are 50 N, what is the mass of the traffic liyer1tsv;nk5* y rlq+g (h5 .poght?

  Two boxes of masses m and 2m are in contact ves3ud9iw(vse c qs4:1s j5h/with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mj 4(/:u91i3ed q wsh5e cvssvsore massive box?

  Two boxes of masses m and 2m are in contact with ech)bvpmg mp ydh2pt jbv( ,9/1k( 2e1wach other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive box/w( ( mvy9tjed)ph k,2 12bpc1 bmhvpg?

  Two boxes of masses m and 2m are co9cc v86h0qozprx j:n1o 7;wzm nnected by a rope. (See Fig. 4-4.) If the fo1pq;7zcz0n6o hjxo 9r :w8mv crward force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the fl jg/dk 1lvzk-a5 5gl9orward force on t-z j vk515d/ klglalg9he 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. 4-al(z)wdkxtrp)to1 0 (o gq+4w5. Box I o gw(w)xrlkd0) pzo4ott(a1+q f 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 fricj -k p8u,a,nahtions 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,an,au8kj p-h a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic fricorn1 ww6bxp v9+na+ -ftions for plastic on wood are 0.50 and 0.40,o9+1r awn+ bwf- 6vpnx
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 coia)- s8l- nm acysi4 mknb-a 8va5; qzgx8r;y(mes to a stop with a -a bs4mnz g(nv8slyq aryk 8)aai;x cm; -58i-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 horizonta*tb b,*3a wwl6p 5fvmdl surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the accele * b6d5tv,*3wwlb apmfration of the object?

  A horizontal force of 5.0 N accel-(g 5hqcy/,ph9oojl b)1nn oterates a 4.0-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 is given sqe- 8r qxdd95an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frd 8d-5sre q9qxiction between the puck and the ice?

  During the investigation of a traffic acj.y/2rp uc1lciq2k7 tcident, police find skid marks 90.0 m long. They 2 kc/tqpc 2j7.y1urildetermine 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 brakes were applied.

  Two boxes of masses m and 3m ar09.g)jr arh.j60vwfv 8jcrao.e 2kfb e 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, wha0jk6heorf..0a2g.br)vvc 9r fj8 j aw t is the static friction force on the less massive box?

  Two boxes of masses m and xku+3 7kt- aea3m 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 coefficient of static friction be7 at+3ka-xkeu tween the boxes?

  An object is on a frictionless inclined plane. The p 8kx4y8ru*2x2n7z rq/0ivqf i3rnvvg( hyhg ,lane is inclined at an angle of3hny 4nz*(rqy0,vr8 hqx2ggxf2i v /r i vku87 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat p/ a segyd3x(ay lx0-5hill that makes 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 inclin xhlu /p37aru2)uxm y9ed plane 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 z+p (mz:/ty8z7csoln/ +mtai ogxl 0/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 q88ta pqax+ei60x g1kne -;yq a constant velocity of 6x0 na-q1ekqxqy +88;6 ae gpit.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 down a rougjqcef+ ;bg q87h $37^{\circ}$ 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 ug.fb h6h f;5g:6-2edhuc9+ctkr rn9k7lxch 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 , 5dz1 wfpkaq8s:apk +a9a*nvN along a rough surface. The cable attached to the log makes an anglewaapv n1d8p k*s,: akq5af+z9 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 11u uk*tdowu o:5qic8 n4ao p5a rough inclined plane tilted at an angle of:o8 uqw 54k5d1o1putuc*ona i $33.5^{\circ}$ 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 d.8jmuqn.( luvqq97 g 1ec3akinclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and9v1qg8j.ncq du(.7queklam 3 the plane?