Which of Newton's laws best,4a8*eo; mutaez pis1 explains why motorists should buckle-up?

  When you sit on a chair, the re8uy.a 9tijch8sultant force on you is

  In the absence of an externalc 2(ps(,qa +ekc3q0 omcw-b kc+ d+rjeh.+a eb force, a moving object will

  When the rocket engines on the starship NO-PAIN-7fsi-aj qrnglbtw-w053 (u1 d NO-GAIN are suddenly turned off, while traveling in empty space,5 ntfq w1-g-w3srlb(ju id7a0 the starship will

  A rocket moves through empty spaclxvyta)y*/jw9e7 +t nd / h1yte 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 sustain its motion isy / tt1v7dt)y 9xa*y+ewjh/n l

  You are standing in a moving bus, facing foz)6iyev1o +vv;p nw hbq1f5v 9rward, and you suddenly fall forward. Y5ob)v9 f6vevwz;v qy i1+ph 1nou can imply from this that the bus's

  You are standing in a moving bus, facing forw qg ej*f 9bfo57tp*kz4ard, and you suddenly fall forward as the bus comes7fq*z5e ftpb4j* k9 og to an immediate stop. What force caused you to fall forward?

  A constant net force ackno:5k*wkx-scu2jlwpfw * ; )yd* d1ets on an object. Describe the motion of the object.

  The acceleration of an object is inversely7(em3 ie txuf,rb qo3: proportional to

  A net force F accelerates a mass m with an acceleration a. Iyc(+e1/lvmu:kjh6 i p*cup*d f the same net force is applied to mass 2m, then the achcu6pj * :i1y d/ c(epuv+mk*lceleration will be

  A net force F acts on a mz 8kt dpalti;f h.)e39yfx - 56eom.mmass m and produces an acceleration a. What acceleration resu9m5ka8 3de;ifx-z f ym)m.p .tl6eh otlts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will flyc9uzrh p349tav hbctjb.9..m away. This is an illusvbpb9a9.u4tc .mh 3j9 .rzht ctration of

  Two cars collide head-on. At every mome ,g*caj3o .ytjj5boj/t j/,vsnt during the collision, the magnitude of the force the firstjb/,a/3ov 5c *jj o, jsy.tgjt 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 5* nqp9mkfr )aon an object, the force which the object exerts on you wil5p*r qk)9nfmal

  Action-reaction forcesdl wl*:* m8dxd

  Action-reaction forces are6di51tlbqaufzu 11 t 6

  A 20-ton truck collides with 9*2/bqcg w;arj+iqm*yesp8q a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is donmgqcr9/+yw**qepa2s8;bi q j e on the car

  An object of mass m sits on a flat table. The Earth pulls on this 2)n(wpo,rvt5dem.+ xjta+ ig object with force mg, which we will emx aip5tw,do(r+ng t.2)v+ jcall the action force. What is the reaction force?

  A child's toy is suspended fr .mq-iw+9d *ej8fnvabom the ceiling 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," whafj 8e-qa dni9 mb*.wv+t is the "reaction force"?

  Your bat hits the ball pitched te n*gvkyjs*/6 y,yf p2o you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose mp,fgejs2y*/6 *k yyn vagnitude is

State Newton's three;te9xgh q )bdll3 m+)zkn 9in, laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon*jhtmv)pg1n7 vu:6 mh dcy6.u than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eartv6j vh d)u17u:h ct*mpm. y6gnh?

  An example of a force which acts at a distanht x fe,8*;)t30iyl9kn9 gg tqsced-zce is

  Who has a greater weight to mass ratio, a person weighmu +lkf/x :.afing 400 N or a person weighing+f lu:axf /.mk 600 N?

  A stone is thrown straight up. At the top of its path, the net force actii)u2l h0jlm .lng on i.2lu l)lm0j iht is

  A 20-N weight and a 5.0-N weight are drowbk 60zzsu3h +q4j 7b3 he.vfopped simultaneously from the same height. Ignore air resistance. Compare their acceler4w7zbo3ehj 0q 3+.fbhkusz6vations.

  A brick and a feather fall to the earth at their respect 0z0p7 p7v 9vbut3 o;zyv6rmykive terminal velocities. Which object experiences tho70pz3kbuvv; pr6z 7t9 0ymyve greater force of air friction?

  An object of mass m is hanging by a string from t ;esm waj7+vg/p(f6yghe ceiling of an elevator. The elevator is moving up at constant speed. What is the 7g e6 +vsmp yjfaw/;(gtension in the string?

  An object of mass m is hanging byv+*ui rn+hb ;n a string from the ceiling of an elevator. The elevator is mo+iun+hb;nr* vving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk huxi* ave9k.p x*m)9iwbm z1k(73uvwis

  It's more difficult to st1ni8- mnv hl55j r*vulart moving a heavy carton from rest than it is to keep ju5 1 lvnvln8*-hmi5 rpushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horif -9:86s m*wfh k dsgnb5gi/izzontal surface (friction 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 to the box's accelerati*z s6ii 8snfdhbg9w-:/5gk fmon?

  A packing crate slides dowk)q x4viz;j* in an inclined ramp at constant velocity. Thus we can deduce that;j *v )kiq4zxi

  A block of mass M slides down a frictionless psj q2*gzyb+ .rtspf39 lane inclined at an angle q with the horizontal. The normal reacpsyj3 .q2f 9sr bgz+t*tion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plf8 7not .k*vkeane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bloc7tv*en8o kkf .k is directed

  A block of mass M slides down a frictionless planb7zq*(vtuq b *e inclined at an angle q with the horizontal. Tvbuz* 7bq*(tqhe gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incline/j3vpoda:2, ej:wi*i 9p xga hd plane that makes an angle of 30e with the horizontal. Make a statement whpv/p:xad:2,j igi9ae o *j 3which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the objectpwkkz-m t)+m(, and it accelerates at )k+-mt(pmkwz $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massqp pq)rx*i klahu; l* .9eu0z) 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car*;))ua kqlle9p .hiqpxz*ru0?

  Starting from rest, a 4.0-wh2.u x.2ax, fw lyoj:kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net fouy.2:h .x 2walfxojw ,rce acting on the body?

  An antitank weapon fires a 3.00-kg rocket whin.09 e,x zbg;u cwfr:rch acquires a speed of 50.0 m/s after cf:e;9ug.z xr,bw 0 nrtraveling
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-kofge rmt, *u+z;iuo15 g mass from rest g*+ ,o5oit1uu;mfer z,

  What is the mass of a person who weighs 3n hh j6ef,vq+110 lb?

  What is the mass of an ob5aaifn74cjp: 9ezew7yer 5 g.ject that weighs 250 N on the surface of the Earth where the acce z9yjnecp57.5ea7 :4igrfae wleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the-.tc-8 t9ntn+can-cpoj-zfig,k+e s mass of the object on the surface of ottc+c k9sjg 8 ftc +np--.ez-ann,i -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. tn/d :vbx8.uc The Moon's gravity is one sixth of Eabnu/: x8.cdvt rth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of 2xj yo g.stby3a0,i-qit9d3u a 5.0-kg rope. Sue pulljq2 y .iy3b oastugt-x03i9, ds with 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 frictionfl :mh5 u-xo8f rrf68mless surface. A force F acts on the stack, and it accelof: 658-xrfm hfmr8 ulerates 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. What4eo78yy z0p,m nnd4kw will the scale 8 4o7m 4np,0wk zndyeybe reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rideguqo, 89 9i(*9h *l;o -q6bdmze xyiay;vzmaas in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of mmh,xua9;i* zy;l6 qd(ao- igaqzvye899*bo $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the pe+)5eq b(guelqwh, beo2*j,r ss)2fhnrson is 60.0 kg and thbr* +qosh2u,q,selg e )bjf52wn)e(h e 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 f/ ro)d4 eo/pyqps c(h+orce 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 thppoor 4edq+) hy/cs( /e acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is helbdvn-+vz9cd; d 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 distance if the load is not to slide forward into tzbd9n ; dv+c-vhe cab?

  An object of mass 6000 kg rests on the flatbed of a truck9lsw,4e ;sj 7fs ogp*u. 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 t*p; ug so4w7jsl9se f,o slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 tz27 7dov d jmtw,wo.-7 y)pyhkg, what is the magnitudz , 2dyy7)jo7-t.v7dw pmtwhoe of the acceleration 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 = 0.40 kg, what ygij, j6op(2pis the tension in the string? (Ignore frip g6, 2yojpj(iction and the mass of the pulley.)

  A student pulls a box of books on a )5 kn1yzuoo(dv0 .fpo smooth horizontal floor with a force of 100 N in a dip 0y( z)uv1 doofok5.nrection 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 force of 1lpk4 y; 8 dro)-kzh.wr,n5g byd:pe2 n00 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is,wk:)b .4r dehp5p-y2g; 8rdyz nkl on 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 Fivob;**y f8b,yl nio. uerm (0t /3olpgg. 4-2. What are the tensions in t0p8 ( ,uo/lg*oo;*tn 3ybibfelvrm.yhe ropes?

  In Fig. 4-2, if the v1hrsby/ wtcly o8s6y7/+,gvtensions in the ropes are 50 N, what is the mass of the traffic light?c, vsy7vhsy lt/ r86yw1+ og/b

  Two boxes of masses m azw.s.w;8jf;6oyb zyh wco;8n nd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerat;wow.nhyb .z8s zjf;yw o6 8c;ion of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on x(.sbgpo;i6b c 3m4vla frictionless surface. (See Fig. 4-3.) Wh b 6.;vlo3gb(psx4cmiat is the net force on the more massive box?

  Two boxes of masses m and hrp3dfz,ao5jsk, t; q (hs*0g 9gz/ dl2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in t9 (d z,3hjzfo5kpt sl/ds*g,ar ;qhg 0he connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.+y(6 v7 iqmaa73kmfv1q lb9x y) If the forward force on the more massive box is F, what is the acceleration of the lesfvykq7q63m7l(mvyaa+ 9b x 1is massive box?

Two boxes are connected4lb0c50 ohgi3y fr:y t by a cord running over a pulley as shown in Fig. 4-5. Box I of crl3y fg4to i5b:h0y0mass
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-kg box and a desk.csiypjl o7-.as,su2 are 0.40 and 0.30, respectively. What is the net for2j.7sis ucayp.o -s l,ce on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictioiuj ri2nh 7h3e3-u+msns for plastic on wood are 0.50 and 0.40,h3shi+n7 r-2mju 3 ieu
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 directionlqbkq .d zy14+ad2*;mbp0cnrd+ nk g2. It slows and comes to a stop with a constant accelerati4 *1pd kz+ .d ; q+gn2k2bql0rycnmdbaon 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 surfa-ogvb-.4o2pa ue uq8 zce is pulled by a 5.0-N force. A 3.0-N friction forc 4gub- qz2oeu.8v-opae retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from dxobatg7ebi7; ( h.l3 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 ao ;odx za qt)pbz)wtrn/ .*+t,)p6y+ho s xak(n initial speed of 10 m/s. It slides 50 m on the ice before it spr/,apxntbwzyatxd q)).;st) + 6(ho+ k o*z otops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic acc(h9h8o nzh0 xhvkkh */*eid:gident, 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. Estimat9*h no0hxkv8d*g(hz ehhki:/ e the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (Se r9olq w)q1w4- ijtxl)e Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and19owxq-j itrwl4)l) q the surface 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. (See36q1iqn/bt q0cdgq- j Fig. 4-6.) The surface between the mc0i1/q -qnqdjt63q b gore 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. Th mx1a99( tvgn59nxxlk e plane is inclined at an angle of l9 ( nx1xatxv9nk95gm$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flatfw8zo:dp r:;xz0 . knw 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 smoot .ubtxxn2t,5o.h pgh*h inclined 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 inclinu e;zxi;mx a )xp:s11g5fxx3q ed 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 incline55 )n0xxyk+aq:xmx w fd plane, at a constant velocity of wm5yf)0nxx5:xak +x q6.0 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 slidesxc 9daorpdwu 7e1d*/2d5 a/o s 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 slides down a rougiedz56b)s- b,sc ws u:h $37^{\circ}$ 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. 5; q.wmy8h qu tba9bz-k x8l u,,yvby+The cable attached to the log makes an angle of la8. hb9;ytzb,8xvyq k ,bqwm5y +uu-$30.0^{\circ}$ 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 rests,:,xfcvez w)3lnrwew/x ). s on a rough inclined plane tilted at an angle ofws3r/exnw x,fze v)l: ),w.cs $33.5^{\circ}$ 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 pla)nt,uf s97 ruqne. The angle of incline is gradually increafntq 7) rsuu,9sed until 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?