Which of Newton's laws best explains why myzh(lj+3l1e g4/k g vtotorists should buckle-up?

  When you sit on a chair, the resc, g33(nuoy fz dt6d:pultant force on you is

  In the absence of an extern /j/wpr4.. zveq) g semuy w3lk:id,v(al force, a moving object will

  When the rocket engines on the starship 8s ,wm4cscqu1NO-PAIN-NO-GAIN are suddenly turned off, while traveliu4c,1q msws 8cng in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. Iq.r2s( 4 ooimgk7q a6xt is far from the gravitational effect of any star or planet. Under these conditions, the force tha 7 rka s64xgoq.i2q(mot must be applied to the rocket in order to sustain its motion is

  You are standing in +,0 k*msn.gohrl .*zj mg.k;qk t3ecxbf4 /jsa moving bus, facing forward, and you suddenly fall forward. You can imply from this that t 3sj +xml;g 0hrk/4z..mbfckks goe*n*q j t.,he bus's

  You are standing in a moving bus, facing forward, and you sjj 2k*2o vz ng)i,qsp9uddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forw,v*2qog jp92zijn) s kard?

  A constant net force acts on an object. Describe 5;mo 5fj *gyiapfa ;0w2z/cxi the motion of the object.

  The acceleration of an obj5is(ld4k5ow8 bb y ragw-a2 +yect is inversely proportional to

  A net force F accelerates a mass m with an acceleration a e+67o)e kg7 j,ttucjtb ah5:y. If the same net force is applied to mass 2m, then the acceleration jcek5+t6a: ) h eyg,jt 7otbu7will be

  A net force F acts on a mass m and produces an aco oy :8o8fktypi;p h,5celeration a. What acceleration results if a net force 2F acts on:ft i8yopo5hyo8 p ;k, mass 4m?

  If you blow up a balloon, and then re69prgsg(58z1wau l ailease it, the balloon will fly away. This is an illustrationsrg6( g9aiza51w8u p l of

  Two cars collide head-on. At every moment during the colso0iw hw66j4u xt.z8 p eoh46elision, the magnitude of the force the first car exerts on the second i6zwo.8i6t 6 e0os4puw4hxhejs 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 exerth-4szvivs ht+g1, xk7s on you wil,hkvgh-s+s1zi 4xt7 v l

  Action-reaction forces c5wj/kt9 j:ivx0;gbp

  Action-reaction forces arefrme;3a p, n+4n2 bo *akrk-h6d2mfkx

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to q*vxk 7 ox,/ffob,*tgp-c + gn-y1h4 tmj 5ydkthe car. Since a lot of damage is done on the cm*y 4goqk ktc +5,1xdhnfj7t*y-x/vg op,f-bar

  An object of mass m sits on a flat table. The Earth pulls on this object wi1w(hch omq86k th force mg, which we will call the action force. Whach1 6qh wm(8kot is the reaction force?

  A child's toy is suspended from the ceili qu(js:r*a ea++c0y cfbpga7wu/ra 4;ng by means of a string. The Earth pulls downwra y7*ucaj:4 grf; u qwpe0(a a+c/bs+ard on 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 pitchedghmbii)t ;,*a to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude bgim;ht , i)*ais

State Newton's three laws.asvku) (+ie/ z

  Mass and weight

  The acceleration due to gravity is lower on9r(x wi,r n4yb the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eab 9(xrnrywi4 ,rth?

  An example of a force which acts at a di ppi *y/)ea *ms+ybfg:stance is

  Who has a greater weight tov7tz yzi5j:+b mass ratio, a person weighing 400 N or a person weighing z5ty 7zv :+jib600 N?

  A stone is thrown straight up. At the top of its pau,ugp g+d8 y, 8vgm yo5ei5q-gth, the net force acting on it isypgo+ -gveu,iu m8 g58qyg ,d5

  A 20-N weight and a 5.0-N weight are droppedc3 :nx m+)g.p8dn7dku fqsru- simultaneously from the same height. Ignore air resistance. Comparp8x7 .qmn) -ddg cus+rfun3k :e their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitt u7 7xl2r9zho1 i+cehies. Which object experiences the greater force of air fr1chhxzeur72 97tol i+iction?

  An object of mass m is hanging by a string from the ceiling of an elev-siuf k03ta fddm/2)aator. The elevator is moving up at constant speed. What is the tension in the )tf -uadi0fds2/ 3 mkastring?

  An object of mass m is hanging by a string from the cei bqtghzps2w,b*z59c( ling of an elevator. The elevator is moving upward, but slowing down. What is the teng5c 2qp,9hz( bb*sw ztsion in the string?

  The force that keeps you from sliding on an icy sidewal sibv943lv e s(m*ou,ik is

  It's more difficult to start moving a heavy cart7rnl,)m f9d-nh4j ey uon from rest than it is to keep pushing it with constant ve fhj-n4n7,eduml y) r9locity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fdaq s.4z ab8-4 gq(lv+x:e3uapma cu:y*m ws 4riction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens toqdqvam :xu* gsesyauwl(pc:a+z a484m 3-4b . the box's acceleration?

  A packing crate slides down an inclined r( 7f:uma0eos2 0fyg rjamp at constant velocity. Thus we can dey(ra0:f2ujg foe70sm duce that

  A block of mass M slides down a frictionlesg1 2,v gfqfksej/2t,us plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blocqgs tv/ f2u,ef12j,gkk is

  A block of mass M slides down a frictionless planhkmf klb2 v-(2e inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directek 2-kfhv(lbm 2d

  A block of mass M slides down a frictionl8s+u/a5gnc mdess plane inclined at an angle q with the horizontal. The gravitational force is dicd/ gun sm8+a5rected

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined planeu3e8o nrikw5+ hr:, pz-e4 bbs that makes an angle of 30e with the horizontal. Make a statemenzb:,+8ibr u5s4o r newkhpe -3t which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N f43be -p/kg lzc7(cg d hzv0y5force is applied to the object, and it acceleratekc7z-3 h l/vp0cyef(g4gdb5z s at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from resfurx tvh ,/zn5*3zxd-t to 27 m/s in 7.0 s. What is the average forward force zfhn/ x vdzxu*t,-5 r3on the car?

  Starting from rest, a 4.0-kg body reaches a 1 u a;qwr-83tvifit g)u6a,zf speed of 8.0 m/s in 2.0 s. What is the net force acting on the bodi3 861 autwt q-f),ugaifz ;vry?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed 6ndw;:so4t z:hsr7uv of 50.0 m/s after zosn764:t sr h;dwuv: 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 fonqa8 t2zfn3):lwy10 pmg de)w rce that you push a 10-kg mass from rest ly )gdw2z:8nw 0mpte) n1q3fa,

  What is the mass of a person who weigq p5b: t9dhp,ihs 110 lb?

  What is the mass of tmt: 41ghiqs(3vzo n:an object that weighs 250 N on the surface of the Earth where the acceleration due to gravitsn4o tz1mi :3h:gvtq(y is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. ujs,. bw38 lieWhat is the mass of the object on the surface of the Moon where the acl. seb38u,i jwceleration 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 ouiqefn69 t:l4(c cs+wn the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objecqnw6cflit4s(+: u e9cts.

  Sue and Sean are having a tu opo:l)h8vp-bib03hq,eonbgxo(4k p f9 x;/ n g-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is pp( xlov/)p gh9qoe4:xi0oobf -,knb3 hn8 b ;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 forcmc 7i70mv v.3 .3ogdxjpci+fue F acts on the stack, jm ovcdv3 px 7c3ig.fi.m+7 0uand 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. What will tbs1- 7zu4giun cs rf;+he scale be reading when the elevator is acceleratib;1r fi7sz+c -sun g4ung downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the jbf)u cr+2q,m3hnh sbw*b(-e person is 60.0 kg and the elevator accelerates downward with an acceleration br cmq jb3bu2,hh -s+)*wne(f of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the masei( 0vyf2ty12ztkr ,: xqr kx3s of the person is 60.0 kg ay0r(kkvrf1x23:z, 2 tytix e qnd the elevator accelerates 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. One force has a magnitjvvgt:54t4.un2sc l7 5wzw pfude of 8.0 N and is directed due north. The second force toward the east has a magnitct 7wwv42uzn 4 lsvg :pt5f.5jude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed ofvq+hasd2f8 h.8 x)bbbp.jco ) a truck. It is held in place by metal brackets that can exert a maximum horizontal fahjhsfv ox+ . bq))bc.2pb88 dorce 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(asz r4mp:9u q rests 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 the load is not to slide forward into themqz4a :(r9pu s cab?

  In the Atwood machine shown in F5.p-9fpgxl/e * o ygefig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the accelerpffp/ *5. 9e-gxgly eoation of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if 8oaf2sh w7s;kfc+t 6v ihoy 50M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of tif857 wcv 6k o2+hsohsy af;t0he pulley.)

  A student pulls a box of books on a smooth horizontalplkm6m 3yf( npwk2.p 0lqc7 /f floor with a force of 100 N in 72yqm.n(pkp/lp6m3 fk l cw f0a 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 cl/z7tnvm1- bnj3ck : of 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 the box and the books is 40.0 kg, what is the normal forc1 vjnbm-/l3c z k:t7cne on the box?

  A traffic light of weight kb6g9g-v vgs3 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rope bg9kg gv6vs3-s?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what isb4ey7ip 9glk0z lhq+kt6d 0 a+3v d3lz the mass of the traffic liz30t649li vqphb +kdlg3 a lk ez7d+0yght?

  Two boxes of masses m and 2m are s nr+as.5dbz* in contact with each other on a frictionless surface. (See Fig. 4-3.) What is + ss*d.b anrz5the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contac sbbk *fgks t*(4;r: pyo4rv)ft with each other on a frictionless surface. (See Fig. 4-3.) What is the net forcp)sby 4b:gvt *(rs;o rk4kf*fe on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the fmxt(n++b )pz 7lty;gx orward forcep++;mlgxbxy tt)nz(7 on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecv4i0w izn10 vdted by a rope. (See Fig. 4-4.) If the fdin04i 1wv 0vzorward force on the 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. 4-5. 3 fi0md vpkfpu,+ g gb-6xwt1,Box 01gfub,3 p,mdv-f 6 igwkp+txI 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-kgend6zq2fc;+j 2eie9hry e-0t7nx+ ls box and a desk are 0.402zersel+0297nedy6i xn- q+ ehtj;c f 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 stamg4();6i cdrr 4k ruhjtic and kinetic frictions for plastic on wood are 0.50 and 0.40(k64);ug ji4rd crm hr,
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 sl :z:8.( gey fk7q;mlwtgy) wgnows and comes to a stop with a constant acce y fym wg;.lnq:8etz(w:kg7g)leration 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 ho oxx8m9a /f-jirizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the mo f9aji8-oxm /xtion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerat3f(jlj; 52x:n mg2iewajfojj t/ g7*fes 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 speed of 12bvn:i; ;ydv ;yo gbq0s /arw,0 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction bet0arn;v/ 2yb;,vsbqd o; gi:wyween the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m lm+ nyt+xiv i e+3flsc4,fq .f;ong. They determine the coefficient of frictc ,f fmxisln v+y;.3i4 te+q+fion 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.q;196; nxug axf8djdby:1 rodb8hju( (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxejb f:uda8 ;d;dx q(1bjxyuh9rn618 gos 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. (S,af n7qb25zs v7ljz 3p *nfzrkz*sl.7s,)k huee Fig. 4-6.) The surface between the more massive box saj3sfuz,q* z.lv7z5)zp,k77 sn 2 lkfrh *bnand 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 plac)u2+d5nzjhd7z ij b:ne is inclined at an angle o5dzhz cb+2)dj7 inju: f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an ang;bb8;rgeyzz3t6v 9n uts (0bnle 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 az8qpsvp8 u+u9s6 cg/ yngle 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 planesi/5m gh*g0 xe 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 pla uhqab9y0ctz kh-v6k0 ou7bc(*1c;sa ne, at a constant velocity ofks9h*c 16b buv(qa0; 0c7atoyu zk-ch 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 a,zc:tnyal,8i 1, gc nm 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 aqgn k.b,(7 ibux: ,o:8ya/s fh vo8gf+8qmscs 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 8 nhdnl pr 6u;,1a6k0f zx*ijp;t 7emtweighing 500 N along a rough surface. The cable attachej7*d0ltuf8;ina,zr 6mtpp; 6 k 1hxend to the log 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 rough inclined plane tiltea 7w3sf-yj az7d at an angle of-zjsa y a77w3f $33.5^{\circ}$ 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-9t9hul/3 w ev +2ejpjd;kpx t of incline is gradually increased ukxt +9 tp9vlj/;32ehpdu- we jntil 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?