Which of Newton's laws best explains why motoriafb8 m c;bxtl, hf1 6*cuz2mx;sts should buckle-up?

  When you sit on a chair, the resumgos. hi xck9z)e99cwp5d;uaxj o8:4 ltant force on you is

  In the absence of an external force, rb::cu1rqg i2a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off5j tn3.q .czml ygj4o-, whm.3yj -tc5nzqogjl 4.ile traveling in empty space, the starship will

  A rocket moves through empty space in a straight line withu 59fhosb+dnn2 q( 9vu 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 r95o(sn +2hd9uq ubvfn ocket in order to sustain its motion is

  You are standing in a moving bus, fq 1;rqa vy3ec*acing forward, and you suddenly fall forward. You can imply from*1erv;c3a qqy this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forward+tx dko82v*fp as the bus comes to a vxp f82d+ko*tn immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion o7ej 48umt9 boved*5l8buogkc 99k: hbf the object.

  The acceleration of a4t. kgv*;bumd0 (ha hnn object is inversely proportional to

  A net force F accelerates a mass m with2dz (heabn ucnqqql2k w0.0ff)8kxh cw0.58 a an acceleration a. If the same net force is fw2z. wbqua8 q ch(058 )0ance q2k0fkdhnx.l applied to mass 2m, then the acceleration will be

  A net force F acts o4.0:jwrpuql v6x k ifusxx9 :v9+j8xcn a mass m and produces an acceleration a. What acceleration results if a net force 2F acts+ 096:j vx4qfu 8spcl .9:jukrxwixxv on mass 4m?

  If you blow up a balloon, apdxmn)sx,: : rnd then release it, the balloon will fly away. This x :m x,s:)rndpis an illustration of

  Two cars collide head-on. At every moment during the colli;s) tkc-pdnx8rm zi:*t7i( jwsion, 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 firn;-z8 * pi7)dcw:im ktjst rx(st. This is an example of

  If you exert a force F on an object, the force which the object exert(gx kta5;xr/)tlgiw0+ ougkb 1bz;8 fs on you wi)/;g xrb1ftkx8ual b kt5o+g;wz(i0 gll

  Action-reaction forcest 9kv.uu : z(pgc7g n6j8dn,de

  Action-reaction forces a0u;a6u ts7fcr-r lor.lh nt 03re

  A 20-ton truck collides with a 1500-lb car5e ua;8u*zgql and causes a lot of damage to the car. Since a lot of damage is dal u ge;8z5uq*one on the car

  An object of mass m sits onqrf*mev*:-b7m is 2t f a flat table. The Earth pulls on this object with force mg, which we will call the action force. *mrfs2mb-eq*7vf: it What is the reaction force?

  A child's toy is suskmskd (le t;+2 si92akpended from the ceiling by means of a string. The Earth pulls downward on the esml;9+iat k2( s2dkktoy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the bal7ve3,.zm sjq ha2a(7j+af egyl pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, w.vez2y7 aa7a(mfg j hs3 +qej,hose magnitude is

State Newton's three laws.1vi4m mjh887gqnh3isng dk.nld6 ,8o

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.jsn nwx-ki4j2f r(t.hj,6k 3 i Which of the following is true about the mass and weight of an astronaut on th4 jkiwnk-rn fijtjs, .2(xh36e Moon's surface, compared to Earth?

  An example of a force which acts 4m2; p+0kp:dwkzxaqggv u4s;at a distance is

  Who has a greater weight tj+xaly9t wf;2o mass ratio, a person weighing 400 N or a person weighing j+wflty9;xa2 600 N?

  A stone is thrown straight up.x;9 ; z zr0c(a-gvg 4i.mitsjh At the top of its path, the net force acting on it xz-c09virjg.( ga;s izmt 4; his

  A 20-N weight and a 5.0-N weight are dropped simultaneouqwc9+ zupko :2v:51gn-faeoh sly from the same height. Ignore air resistance. Compare their hnoga5z+feq 2w:vp:c19 ouk-accelerations.

  A brick and a feather fall to the earth at t,/ kv46pt cbr zbkv2x2 cyv29cheir respective terminal velocities. Which obkyc v, 46kvzb/ c2rt2b xv9c2pject experiences the greater force of air friction?

  An object of mass m is hanging by a string from th6 89srgjbytv3 e ceiling of an elevator. The elevator is moving up at consty9 sb8vr6j 3gtant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevath44nx34 l ba9zjrfj-a (f ,t:rge:a vtor. The elevator is moving upward, but slowing down. What is the tension in the strint44 jx9r4(-lfb,e zhata : :rf gvjan3g?

  The force that keeps you from sliding on a8sbczqxc4o.4 o o :4xsn icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is txm)dv h48 meyr+..3puccbx g6o keep pushi y ge8.c6. cdxr3u v)+mpmbxh4ng it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizoudrm 3 4btbq.2 (pzn)s4eknn3ntal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the sarsqu t 3(nb4bnmn4z.e23dp ) kme 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. Thus we ccd.k/ ssxqznrx618 -san deduce -d.kxr/ sx8zsn6 scq1 that

  A block of mass M slides down a frictionless plane incl uvizxqx zke 5+:2hb50ined at an angle q with the horizontal. The normal reaction force exerted by the plane: + xxz ue5zh05i2qkbv on the block is

  A block of mass M slides down a fr6k ub5;endd* rictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted b u dr;5n*be6kdy the plane on the block is directed

  A block of mass M slides down ha4-1sgmx* zr5rb r026grl ala frictionless plane inclined at an angle q with the horizontal. The gravz l6-5g 14rr rmag 0l2h*bsaxritational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an,/wq85watmwr 43hp qn inclined plane that makes an angle of 30e wit q armpwn/t,w8h354w qh the 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 to the obje:98 rd.g8i-s zm.nvg(j wcb2sgyuxg- ct, and it accelera(j.gz:c -sg2 nu9xr d8y8wgib- s.mvgtes 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 wy)n du 5ct8+hin 7.0 s. What is the average forward force on td)nt+ cuh8wy 5he car?

  Starting from rest, a 4.0-kg body reaches a speus q03 kp*4efled of 8.0 m/s in 2.0 s. What is the net for 4u *qfs0pkle3ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s aqk zhu 2pt79(go/ 0maz.ng(fh 6r/uvyfter travelinzm/zo g6hvp((.ut7r2k0fq g n9a/yhug
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 tb4 yknnnq/s)d nmx;0z zz5r: 0fyr/ (p8sxxd-he same force that you push a 10-kg mass from rest zmq ;4dnbpyfz-xxxy0s/kszd r05rnn ):n/ (8,

  What is the mass of a pew ; 5 faj dsj/()52mqglegod/xvrm-*v9ue - dsrson who weighs 110 lb?

  What is the mass of an b(q jv9) zdi.dobject that weighs 250 N on the surface of the Earth where th .( vziqjbd)d9e acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the massnleem;nh e1.n2hpp 15 of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that o1.mehpn 1nle2ne hp ;5n the Earth?

  Object A weighs 40 N on Earth, and objn-3:r--j gia9fulzwbi)b9u ill+/ t ject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. wif z/i-- 9l3+g-u9n:jt)bil abrjulCompare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg r6 yw;(w ryep;5wcpq7/7hkmmk ope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates tokyw(;5pm7 mc7;wkrhewpy6q / ward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a r i07zio l/xa;level frictionless surface. A force F acts on the stack, and it ac7aiz/lxr ;i0 ocelerates 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. What willo; 2 k:ojg+y iy3uabs) the scale be readingku +joog)3yba;yi:s 2 when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mas zx bzmjma7;by2.s;qc1wk v20 s of the person is 60.0 kg and the elevator accelerates downward with an accelerbq 7 k2w ; b0v.zs2;zcxmmjya1ation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator.y.y t:vhf+v l+ If the mass of the person is 60.0 kg and the elevator accelerates upwhf +.ly tyvv+:ard with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0.ohb rrw3rr 4 q:5fdhj9*wme9-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the maseow9 qd4wh fhrr: 5.* 9rmr3bjs?

  An object of mass 6000 kg rests on t ql.oi- e,6o5liai,xc he flatbed of a truck. It is held in place by metal brackets that can ,a .qo e5xi-llii,c 6oexert a maximum horizontal 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 ue ))7csplfsvu tp -:,tbbd:p zt* .1trests on 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 truck is traveling 15 m/s, what is the minimum stopping time if tht cp7t:1 sbbps*f,pvdetu.:u l))t-ze load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if 0z;6ss hrilu9+ixw6yM = 0.60 kg and m = 0.40 kg, what is the ma+9ir swh 6uyisz0 l;6xgnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown fx 5upn/hwg +r2 *nix+in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulleyxgnwrf+p 2 nixu+ *h5/.)

  A student pulls a box of booksm. r tg.ltxc c0/vsa9+ on a smooth horizontal floor with a force of 100 N ta .tcr0m.gc9 s /+lxvin 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 f j d*vpv2phnv70 6m2qon a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontalq76f 22 vm0*ppnjvdvh. 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 * ioo eag-f3-;tjjm -wtwo ropes as shown in Fig. 4-2. What area;emgojf*wt- --io3j the tensions in the ropes?

  In Fig. 4-2, if the tensions in thehooxauqo3,; :s -7apu ropes are 50 N, what is the mass of the traffic liu- sqap:x7 h3ouo,;aoght?

  Two boxes of masses m and 2m are in contact with+ ph: .vj(px:;omrmo,4cx4aw l et f,h each other on a frictionless surface. (See Fig. 4-3.) What is the acc ojlo: m4fh(. r c:t+vp4;p,weax xm,heleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other oaz4 z87cs l,tcoq +/1gqm ew,fn a frictionless surface. (See Fig. 4-3.) What is th+87cgte ,zo ,l1sqf m/qc wz4ae net force on the more massive box?

  Two boxes of masses m and 2m are cj8x15x0n lpq 4sjp: hsonnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the con 8 jl5:1pxj0 phx4sqnsnecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If 9ent:.k,2u smhpv e r:the forward force on the more massive box is F, what is the acceleration.sre2,ht m:u v:9ekpn of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig.hpw1vrh:3. f5qx pn *g 4-5. Box I of mh n*5x g1hf3rq:vp.wpass
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 staticv+kho6a: h1v2o .8 )kyeiahsn and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net veh:v)1iy8aa koh s.+ 6hkon 2force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50)8dxg bz 0r8p8tpw-q( hyi c.yq,h6 ou and .yw ycqdo0 q,bg()h6 8uhipxzr pt-880.40,
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 lev5aahck.umcd,9xm k s8u lt:)/el surface in the +x direction. It slows and comes to a stop with a cons5a:cut/.u,)a m m9sx 8lkkdhc tant 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 o)cw1 qw s4yofy 6m8avz(76d gvn a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration ov vw(s1w74a)dyqmcz 6fyo 68 gf the object?

  A horizontal force of w32la0vdc.ad8h0 kap 5.0 N accelerates 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 an initial speeddm)imx)+ux 6 m2,phhz of 10 m/s. It slides 50 m on the ice before it stops. What is the mxpmd zui, h)6m x+2)hcoefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accideypi9b/k(ts hwyq zh 6t/dee c7b116m0 nt, police find skid marks 90.0 m long. 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 w ismh96 twet/e1zdpkyhcq/(1b by670hen the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The lu4jklvt0sm (7o3az 1 surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If thu0tl4kzj lma o1 (73sve 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.kiyf:mz6 pv2vtmb be o5w 24u9n- 4my:yo w3f6 (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is 6:youmm v bn-24:pty9bfmek2wz46fwoy v 3i5 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 plalk 2o y*qr2( yx,x f.-phrfww3:vhv0s ne is inclined at an angle o(:,hxwv0f.2y kxl3- or*s2y vhr qpf wf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides m:e hibgy: hjl2.mrc +9h6ka3 down a flat hill 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 inclined planwkf: nc ;6 :*k:fgsmbavyku4 4/uzo8he 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 + ts c;ysbu.5pinclined 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 co iv;j7q nu--jmnstant velocity ofj7-j mnqiu-; v 6.0 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 agbg6kmh 21 trz)y f2h) 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 slide r4e98ls skfy)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 al qty2 q:-dn,*vt-6sh:eg wko iong a rough surface. The cable attached to the log makes an qhkgs-e- 2w q,t:v yt*ni6:do 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 plane tilt8.k6g i3. vlsxd sms(n zxl;8bed at an angle ofv;bd8x xnzl (s6.8lg3ks. ims $33.5^{\circ}$ 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 ofoxot9 axia0zl9n9,- v incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is thto vao iz-9x n99,a0lxe coefficient of static friction between the object and the plane?