Which of Newton's laws best explains why motorist7mbhayucr.v 38:g;* padf4in1b m m-ts should buckle-up?

  When you sit on a chair, op5eskb21f cc+, 0+os z:dgo-g6w pjr the resultant force on you is

  In the absence of an external force, a movingy;. s8 iv(8* uxo pdbbhiwvl60 object will

  When the rocket engines on the 8b hwl( k80bhkm9qp pcv j,u73starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the s kcbp 830 8(jp7bhw,km q9lhuvtarship will

  A rocket moves through empty space in a straight line with constant speed. It 6f wxd0ikjho)5; ekn5is far from the gravitational effect of any star or planet. Under these conditions, the foro5kw)jx;ife05dk 6h n ce that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall for vw8 1kwxd f 8ctw9g7jth:6+bfward. tb 8fd9fw1xktw+hg6j w8c7 :v You can imply from this that the bus's

  You are standing in a moving bus, facing forward, and yo:5) twpsj9wn zu suddenly fall forward as the bus comes to an immediate stop. What force caused you to fa 5wwnp) z9:sjtll forward?

  A constant net force acts on an object. yqmt2g- -f. qeDescribe the motion of the object.

  The acceleration of an object is inversely propo2 qp/02;o3 )iwyhcek:(bre cxe6 jxrsrtional to

  A net force F accelerates a mass m with an acceleration nq::08ivjh zsz:ggqi-*fm(84y xamja. If the same net force is applied tq-f 8vg0mzm48 a::j:hyn(xqs * iijzgo mass 2m, then the acceleration will be

  A net force F acts on a mass m and produczly-iinq :ad jb -3n69es an acceleration a. What acceleration r96qin:y-di a-lj bn3 zesults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ba7 a m)v/ysdo*bga ft (+-sdqr2lloon will fly away. This is an illustration of2sdg/ )rb 7to+-yam dfsaq(v*

  Two cars collide head-on. At every moment during the collision, the magnitudov wl3ap;y: z66xj :t3mgdcf )e of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on jct6oly6pdx ;:f:a) v3gwzm3the first. This is an example of

  If you exert a force F on 1wdu (3 v8oxqxzmty8kn3m 3-v an object, the force which the object exerts on you wixqny(3 dk8m3- t3 ovz wx8v1umll

  Action-reaction forc2,/51soe9e0 vdjmv t zjucxb* es

  Action-reaction forc8 wvd*aitao19w-4 a vses are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to7.sm uuz2nu* v the car. Since a lot of damag.u7 msvuun2 *ze is done on the car

  An object of mass m sits on a ) lv6p:* ; lzlh xo;hihb,iapnnm; u1(flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaon; ;1ivxilp ,(z;h l :bnphuam)h*6lction force?

  A child's toy is suspended from the ceiling by t7g ;u5b2c(vttu,knu means of a string. The Earth pulls downward on the toy with its weight force of 8.cu;u vtb5n,t 2ug 7(kt0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous fge)l h:92v ekfd.g ;tforce. The ball hits the bat with vft.:gh2ekef 9l)d;g an instantaneous force, whose magnitude is

State Newton's three sdq w 2sl-ra t8n47et9laws.

  Mass and weight

  The acceleration due to gravity isr1i-p +jrn9hrg(ytc9 lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astrona t ji-hr(g1r 9cp9y+nrut on the Moon's surface, compared to Earth?

  An example of a force whichs+(bdrnyg 4;zmd 7 sd4 acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 40d .li*cu5 ,f2 pizjpe70 N or a person weighi5 cd eiplui2j 7fz.*p,ng 600 N?

  A stone is thrown straight up. At the top of0, )ph k*fqg.kbfr iui6yr0 y2 its path, the net force acting on it i.*b)u ,r0 yr g iy6hpqkf0f2kis

  A 20-N weight and a 5.0-N weixw. r8em1z2*tw0n3ruxjj r) af ax c(3ght are dropped simultaneously from the same height. Ignore aifj 1*xt uxm z )jw(2re03w8arxa3nc.rr resistance. Compare their accelerations.

  A brick and a feathe-bp ua4r 2)1lnean4mh r fall to the earth at their respective terminal velocities. Which object experiences tnm)na4-41 uph2 l abrehe greater force of air friction?

  An object of mass m is hanging by a string from the ceiling g*5tii szh-2pof an elevator. The elevator is moving up at constant-i5shiz p gt2* speed. What is the tension in the string?

  An object of mass m is hanging by a string from the aos(.qaju;tb3s3 / q *n;g6lpoqaam0ceiling of an elevator. The elevator is moving upward, but/ s;*qq (3abj0p 3;6soo agaa.lutm nq slowing down. What is the tension in the string?

  The force that keeps o/o+gkbx5l m( gfk+/p you from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest thp p2tcdnc9 n :yvimw2yr63. k5je/b2yan it is to keep pushing it with constant velocity, because b/y d3nmcnw 9vy2ey:2tp kp ji26r.c5

  A horizontal force accelegaetoie 9 0r6ymct6pp6 ;9 *cxrates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the excecoa 06;6ec rmx9et p9tyi6*p gption that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined xj5*rih m0ux 7ramp at constant velocity. Thus we can dedm x*5h u0rxj7iuce that

  A block of mass M slides down a frictionh-y5 mcc2ja q)/vbhq4less plane inclined at an angle q with the h-/ybcq )cm jq2va 5hh4orizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M sli 5-f+faa kd)mme hk5,va;kvt *des down a frictionless plane inclined at an angle q with the ho-tv ea5h,m)a +fkvkmka*;5 dfrizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incling wsx6fn8kf9wzy33 k3ed at an angle q with the horizontal. The gravitational force is directe6z89x ysw3 kff 3wg3knd

  Two toy cars (16 kg and 2.0 kg) are released simultaneously o hovywe;m,rs0 :;(ssw n an inclined plane that makes an answo(m;,0rv : ; yhwsesgle 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 is applied to m;b8*gepj ;pv1r:z ko the object, and it *j ;:e r8vomg1;bp pkzaccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelqhcu8/z./ x 6na( *z+9mvwec80dm nqer/kt z cerate from rest to 27 m/s in 7.0 s. What is the average forward force onxwzdn/a c /hue6+rmme k890q8*/ z(ntcvzcq. the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whak 6 7cfi99nhfft is the net force9 fhf6ncif9k 7 acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed jsck 8cy.5q1+nouuj/ of 50.0 m/s after s+o 5uk/jynqjccu18. 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 force that you )g 7z:v3uy5rhx 4ldqx w8niy -push a 10-kg mass from restyidw5hxr zl-:83y g q7 n)vu4x,

  What is the mass of a person who weighs 110 lb3 *zulmfmb1./t3lim s ?

  What is the mass of an object that weighs 250 N on the surface of the Ea*w wy5htq(n,*q:hf + ty aldz.rth where the acceleration due to gravit*q*(fh.zd: n w yw y5tthaq+,ly is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mr)0x u/ hhlh.dic5 6eyass of the object on theu0 c/6 )yhl.hix5 drhe 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, andom*7rhki4+huq q l6 z+ object B weighs 40 N on the Moon. The Moon's gravity is one sixth of mqqhi4 +ul h7+zo6*rkEarth's. Compare the masses of the objects.

  Sue and Sean are havita6hj)8ce/w fh7- uqm :ydk)hng a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean'm ea7 dcuhy68j)t k)whh:f/-qs force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless suw m k6jvqp:j-5rface. A force F acts on the stack, and q-vw:k5jjmp6it 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 )25+c:o rryjjmq d1 pzN stands on a scale in an elevator. What will the scale be readin1+jyco )dqp2z5:rj rmg when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of*oa4v0jn (dx o the person is 60.0 kg and vo4*0 nj xoda(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 massqvnz)d 7qgw ;x gk+zy 3uw3u4, of the person is 60.0 kg and the elevator accelerates upward with an acc7,z u 4;qqv w3uwgdnk3z)xg+y eleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a qo0d*7z d0v+f1l py qv5.0-kg mass. One force has a magnitude of 8.0 N and is directed due o z*yl1q0+pvf 7qdv 0dnorth. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 60boh6p .v e mz-q)a31cj00 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum h1 .ob6pj mq)zach-e3vorizontal 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 6009n0z5 xxtiqr py2y9l 60 kg 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 0z y2i9n6qrx9tx5lyp time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0a:wmb us(2h b8ye, qw0.60 kg and m = 0.40 kg, what is the magnitude of theum20h 8w(: be ywa,qbs acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine sho1wswtrf1g t u )/smh -zh. yhcf6.y++gwn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tensi)1ss.wf +hr 6. +tyugf- yhtchw1mz/gon in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of booksji :znya29t;m on a smooth horizontal floor with a force of 100 N in a2 tiz;9njm ay: 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 5 wg42 csc pmu 6ftw.tz.i.5ka0lz7zs9 fk4axon a smooth horizontal floor with a force of 100 N in a dire55gi.9tzcf.aumw4l z 2xcs7fask.wz 06ptk4ction of 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 Fig. 4k.,bfsjva)4, e yote3-2. What are the ten4a bf,s.t,yeoe3 )jv ksions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the km9x:ms v zm3yf(bpo 625clh(traffimhsm:6fmk(23 z9xypv l(bo5 c c light?

  Two boxes of masses m and 2m antp39 /tz3cyv.o t;bigm m3:k re in contact with each other on a frictionless surface. (See Fig. 4-3.) What ipc9 m;/ mgzt:.kyit3tv 33obns the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a fricti2ixahl1 fp(0v: pf mtewzk+s -i12; flonless surface. (See Fig. 4-3.) What is thms hl10pe ix (ftp2l -f fv:wzka+;12ie net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See 6bk,8 4 w/nb3uzysx uiFig. 4-4.) If the forward force on the more massive box is F, what is the tension isb68kzyb uw 34,ix nu/n the connecting rope?

  Two boxes of masses m ghflv+) bpehe738 c bl(4 r9koand 2m are connected by a rope. (See Fig. 4-4.) If the forward 9e3kflg4hrlo h( )7bbe8p+ vcforce 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 ine vke7eej e(.: Fig. 4-5. Box I of vje e.k7e :e(emass
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 7 uzq y6xyfy2:qpd *l r/lkrs0hfvvoy-w,66(a desk are 0.40 and 0.30, respectively. What p7of:rdy0x /zq uy 6l yvhrvf,k2s 6wq-6*(yl is the net force 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 arek m2kub (j w0ra0tk6/g 0.50 and kg6/k0uw (rm0 b 2ajtk0.40,
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 +f higy)e(dxp)9 5zo v7x direction. It slows and comes to a stop with a constant accelerzihv fxd7 g)py e()5o9ation 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 su di-0 mnk3sw. unfru+1ss;b0t rface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is tr 1s3u+n0wd-s.s bintm;0 kfuhe acceleration of the object?

  A horizontal force of 5c+ ad13hlp(e/7jarcztc /o5r .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 inps34k,-s: 7ws1at doqg2 mdhnitial speed of 10 m/s. It slides 50 m on the i2-qd pwdg71an ko3m4 ht,ss:sce before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 4-8 d(to mu.hak;d aud90.0 m long. They determine the coefficient of friction between the okua.dm dud4 8a;t-(hcar'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. (See Fig. 4-pfwmbhzbt y+5+73mm ;/qh 4g c6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the bwpcg4 tzh7qb/m5y m m+b3;h+ foxes 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.) The tez*3b;yvn 08cln :,msebyc5surface between the more massive box a5n sb ;t8emvy3ezc:*,n0cy blnd 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. Ti4 h bo0m2zf5dke: uxabqd/+9 he plane is inclined at an angle ofu9b2 e4haio/ bq+dd 5: z0fkxm $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down akv ool8q0go,m/9 pa+v po8ol8 )b j(ok 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 plane with2v(k t4hb7e dkwwyhv* nwt-8g) g8g(y 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 smorya5uq 1r wh ezid:j(55ax4e) oth inclined 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 5 1 i1 xoe4pj l2nmewim3k)a*tdirectly down an inclined plane, at a constant velocity of ex 2o4 ne3ipl1atw)*15ijmmk 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 n j bexaqhmmkiy*iu3e q/ 8/g10q( /1)ulpdv0 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 p 7ia-, decpjvqr4m (wvw97a +m slides 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 surf yoysf.m d206f yga(a8ace. The cable attached to the log myaa(.y 2mgo8dy 60sff akes 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 tilted at an an2b lz+:m ;rynm8g fp5egle o:yrg+em mf58 2z; blpnf $33.5^{\circ}$ 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 iny.j9x9k fl rt:nnf ,k:7di c;ccline is gradually increased until the object begins to slide. The angle at which this ncd lf,9k: x.irfk:yt 9j7n;c occurs is q. What is the coefficient of static friction between the object and the plane?