Which of Newton's laws best explains why motoristsg,q.4+4 (ipagn6 bwedoy nhg) should buckle-up?

  When you sit on a chair, th :v7:/zuarrs e 8kbhkk98ey w.e resultant force on you is

  In the absence of an external force,6yb4/a j ps9f ;emlb8p a moving object will

  When the rocket engit yeow9( bn6 z(7 4rtbd:ofcj(nes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the cw (bob t ztj(ye (9odf64r7:nstarship will

  A rocket moves through empty space in a straight line with constant speed. It igpav82q6e xf,s far from the gravitational effect of any star orxa68 p ,vfeqg2 planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing fobu.3dzry2mn 3 7 u:nkdrward, and you suddenly fall forward. You can imp2 ndb7mduy kz3:3r nu.ly from this that the bus's

  You are standing in a moving bus, facing forward, and yo p .r2s5mp8 )cexlomm-u suddenly fall forward as the bus comes to a52m s- r)mm8xcop.le pn immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objelgv4f+ 2 rckg4ct.

  The acceleration of an object is inversely proportional topqolpb . tbx+,( j a31,d4iahz

  A net force F accelerates a mov8tk:u . c9i j)sc/ qr5u9bp1 pbz.upass m with an acceleration a. If the same net force is applied to mass 2c oi zu j)1 vbqpu/k8.c:pur psb9t5.9m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratioe3jg6hg+o9 i en results if a net fhgo 6e39e+j giorce 2F acts on mass 4m?

  If you blow up a balloon, and then rel+orca7t qsa jr+p8.cxkw6k 1 5ease it, the balloon will fly away. This is an illustratcw kso6+rca.18rpq+t akj x75ion of

  Two cars collide head-on. At every moment during the coll/ vbu p.,9ji ks2ntjcb) +k0mpision, 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 ob9ppk j.2isc/n0m +jtkb),u vn the first. This is an example of

  If you exert a force F on;8)fgp zkt9 9+wq 8aemf1zl qi an object, the force which the object exerts on you wil9i pz 19fw8qz m)+ l8tkagefq;l

  Action-reaction force cwm 2(:k85qs1(flsi sg5sms ps

  Action-reaction forces arb:pzye e2o923h4bxpie

  A 20-ton truck collides with a 1500-lb car and cau+unbz 9wxi/) *0dx(a bbj0vl naw 9s5ises a lot of damage to the car. Since av bsdin *n/)ai9+9blj 50b xwu0zax(w lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object with f2 *te mc e:jv:eef:ou4orce mg, w v*c4et:e:u of:ee j2mhich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth pe q9(1)dlsa qj9gi1xkulls downward on the toy with g 1s(9xileqka) dj 91qits weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N ins fok6)hq gl h5p2;yhd8tantaneous force. The ball hits the bat with an instantaneous force, whose magnit q );g f2h8hkyld5oph6ude is

State Newton's three r (o7a te.cr9l7nr 7qblaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on 7wdm eo(+y2o2t7;g n6wncyl0 es, hqd Earth. Which of the following is true about the mass and weight of7 (hwdnytgenos o7mq,cwde;+ 02 y6l2 an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actscato9+r-u /qsz ;hu7n at a distance is

  Who has a greater weight to mass ratio, a person weigh/.x 67.( wuarwq:c-mq2)vvo y 67bu wozubkpxing 400 N or a person weighing 600(6uqbub xvwzo w) kpx..-ma6u77o/2 v: r qcwy N?

  A stone is thrown straight up. At the top of its path, the net fos/xek m ddc3ie,43ne 5rce acting on it eksmcidx3 en3, 5 e/4dis

  A 20-N weight and a 5.0-N weight are dropped simultaneou) 8x n y8tux)p5p6u2ryjdvl*ysly from the same height. Ignore air resistance. Compare their accelerations xdyv8l)r5y)*jp68t x yp n2uu.

  A brick and a feather fall to the earth at their respective terminal velocitiesmog 1i6 i-p(hr :yq:.mph .boz/p9kgu. Which ob 6.yi:mo - (p rk19hpgm: q./gbpozhuiject experiences the greater force of air friction?

  An object of mass m is5p:,ny6av 6enqi :b c(,fckpjlm h5q) hanging by a string from the ceiling of an elevator. The elevator is moving up at constant spfb)6nne q5: i5 h:,ay6(cq,cjp lvkmp eed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an k.7kc-l udlm4elevator. The elevator is mo .ldu4kml7ck -ving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an r5i :grse.5beyo ,p yd1z35wticy sidewalk is

  It's more difficult to start moving a hero;5kdy34p o javy carton from rest than it is to keep pushing idpo5j43y; k rot with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfacetfz (+ pi u8)ml3mujx; (friction is present) at a constant rate. The experiment is repeated, and all conditionutxf) ;z3 p(lu8i+m mjs 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 constu0w)7uqcidiw p7f sm s 9) .sw9q-do2bant velocity. Thus we can deduce thatq.sup9souc 9-qdf2 i)m7wdb wi) w7 0s

  A block of mass M slides down a frj 7cor u cuob4miuq6(+e+4)r5dbv0mnictionless plane inclined at an angle q with the horizontal. The normal reaction fo m(dqcoub50uu 7bvejr44+m )oni6 c r+rce exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with thxqrcyx 8q if e:7ve)5n :p8,rhe horizontal. The normal re:pxvh7qrfei,x8)q : 5 8rycneaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at anfcmfcc9e+ew e+p1mo nk.750 my0 ik)n angle q with the horiz+ cowm9en0kf1 .ncfkyic m5p7mee) +0ontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclinedox0e* tkj3mx+9 lp: im plane that makes an angle of 30e with the horizontal. Make a statement which best describes their ap3otm0k9jxi m:+ exl *cceleration after being released.

  An object sits on a frictionless suvp/ gyle:i97o6 sccq7rface. A 16-N force is applied to the object, and it accele7i :7/pgoescv9lc 6qyrates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10a.oec e ggo4 3vqhk7:200 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward forck:7e24oqe o ha cgvg3.e on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whpr;(jg;udt+oe;i: bo at is ; :gbop+ ;utd;jri(eothe net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50bj:n4h j81 r8jtzk, k p26rt-,nlhnjl.0 m/s after trav82plljbk,j- 4rrz : nnt6tj, jhk n18heling
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 1q dh2r /64jqor0-kg mass from re d2rh4/ o6qjrqst,

  What is the mass of a perso l2;ltv0/eeukn who weighs 110 lb?

  What is the mass of an f+qgfuz lk:62h32 qv1edy pb,f5sr+dobject that weighs 250 N on the surface of the Earth where the accel dz:kdbs,++q l2gp 1 hr5fe2f6u3f vyqeration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of vuc oh 3q,.hfi)n9szs5 7d tsm1 /mz1dthe object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the ti9 m fc.)hn5s/ dvou1 mz31s7zdh q,sEarth?

  Object A weighs 40 N on Earth, and objje(z/ :n5ldjl puf+li)e.c s5ect B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earthu jsz:l5flne5 dp/+)lei (jc.'s. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opp3pxan8b*r+:axemsgg j(c0khoi 98 d3 d2nub7 osite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is b g:xep03 a s+cmd(oun98nk3rbajx 28 gdh7*iSean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a zhw fzj* fx9 f*prta 9st5en4tz8c*m(z+6 w4plevel frictionless surface. A force F acts on the stack, and it acc z*jwmz ts*(fz94cw5t48rze *xpa+6fn fth9pelerates 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 wi xby ryd, j )o7u o:6ayya.c4upjz; j+;b4rc)ill the scale be reading when the elevator is a x6a bj.74cc raujo+odby4jyy;,));pyu:rizccelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass5y nif() jyk;d of the person is 60.0 kg and the elevator accelerates downward with an acce; )yky(jifn5 dleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevatorkty *okmykr )5v hs 14ir/fe73. If the mass of the person is 60.0 kg and the elevator accelerates upwa/kt 1kmy 7 f5i 4)hs3*veoykrrrd with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0d7a5dju5-n7faud4i y q); 2totvn2ym-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnit747t2 j )a5;ud iftvydydu-n5mn2q oa ude 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 iwv f)8ulyxcky/z 9, w0n 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 n yyk,v)x 9z8wluwc/f0ot to slide forward into the cab?

  An object of mass 6000 kg rests on theuv,*u yo( sk+i 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 15yus(k*i+,uv o 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 *ypgfnd+*e u) m rw. a9eacunb*q l( 60ov)f4t= 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pu*uqn(te 4d 9.*+ff0olcuva6y *bemg pn)w)arlley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and mv:/an)*4a5x qryz28xi xkyh w = 0.40 kg, what is the tension in the string? (Ignore friction 8 r)iaq/ :hz 5y*y4xw2nkxxavand the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wqugvftg fx5 p8 0/s)h3ith a force of 100 N i 0fgp/g3t)5 8hqfx vusn 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 smo (* ppbahq7g a)lr5ujdn,,b9gt dm-h(oth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and 5 g9npbd(rat,mh ,hg)b-d*( 7apujq lthe books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is suppodia ;jxku.212vdp;9xbuwik 0rted by two ropes as shown in Fig. 4-2. What are xj;k9uxa2v u.ipd2db ;0ik 1wthe tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massk2m6yn) 6afps of the traffic ligs2 fka6yp)nm6 ht?

  Two boxes of masses m and 2m are in cpcy4zwuszb f)w8 ;b(5 4 nwb7kontact with each other on a frictionless suys)wz74wp( wb5zn8k ; bbf4 ucrface. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are xuq:(l.zm,t/dv k1wp in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more mass mz(q ,.lt1vpk/xdu w:ive box?

  Two boxes of masses m and 2m are connected 4q .l nuw0i6lqts.d/oby a rope. (See Fig. 4-4.) If the forward force on.4l 0nswqt q6uli/.do 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 Fis dfh4( bgum7r( cf)-+0 nsgmig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the leu b7mi(gfrn-(f+4c 0shdm)gsss massive box?

Two boxes are connected by a cord running or;0+h ysgi im ed5,j,lver a pulley as shown in Fig. 4-5. Box I of masml,+rgyihe0 ; , idj5ss
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 desjod7t, zrqm0h -*,,, zd otjykk are 0.40 and 0.30, respectively.qoko,, jtz0, -mr7d,jd*hyzt What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic (f):txez);w fs s i)fhfrictions for plastic on wood are 0.50 and tis h:s) xf;fzfw)(e)0.40,
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 +x direction. It slows and coc;b3nj cu* rb8mes to a stop with a constant acceleration bj8cr cu;n3b* 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 surface is pulleg m3twy5pi d07 dtp+y6d by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleratd6t5m0+ppw7 iy d3tgy ion of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at uj yyy+4- i:uiffw8)sz 8c 5cya 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 i91p; c.-d 96ucarfqel .en wjsnitial speed of 10 m/s. It slides 50 m on the ice beforeal ccjsu9 wrp6 ..n1q ee;9f-d it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a tyb62 6,x //)ecrnkb biv cju9 yme*oq9bx; )dfraffic accident, 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 prevaili,fbn6u red bicqb/)yv/b)m9692 j ckoexy * ;xng conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfacen jjx6m gxlwe 9bgtx9v ..czui n(*)/3 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 static frictionxmgz9j/l3j.w* 6 ) ncux vbinet(9.x g force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweenbz- aax9tw5 b;ryf3-z zoi.f* 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 coefficientazr.fyzo*- t 5; i-wb za3x9fb of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at an ang: 82rkxo j/qwlle 8ojw qk l:2x/rof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill/yms ji2x2+wx 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 inclinedj0 4t0b t/fn vjv(2gth:mw4mdb/x4 ab 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 a46dc ri2pdga7 dm0hit 8*4aavn 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 constant v 0-pdk7aq*n:azc q7(bmu hft8elocity of 6.0 mqfap hk* t (: a-n77z0qbu8mdc/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 ro/qug (lb xwvp,x qr+)1ugh $37^{\circ}$ 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 ro9baum 9 k9hxt:ugh $37^{\circ}$ 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 odymi5bvv u1lz-y 476N along a rough surface. The cable attached to the log makes an angle ofz 4bd-mvvyul57 1oi6 y $30.0^{\circ}$ 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 incps+w zg dhmvj. ;+p0cw(d/h5clined plane tilted at an angle w ;z/.hhp+ d j5csc 0vm(+pgdwof $33.5^{\circ}$ 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 incline is gradu(r0odhmnn8 ugjr3i ,.ally increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between thnu(m3djgr,.no8 hir 0e object and the plane?