Which of Newton's laws best 11x 63 sfmc0(x85a(wa*e nyaje hucdm explains why motorists should buckle-up?

  When you sit on a chair, the resmj(zb 1 drdx:;ultant force on you is

  In the absence of an external force, a moving objectf6ir 6yxcne:nt c 08;q will

  When the rocket engines on the starship NO-PAIN-NO-GAIn qk1, r-7vywn: k;ljnN are suddenly turned off, while traveling in empty space, 7v:y1 ;n lqj,knknw-rthe starship will

  A rocket moves through empty space iap0 og sls(on n*7zmaz7-0l.in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, l.ssg0 a-0ia l7( zo7zpn*no mthe force 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 fall8*h g0me04q isu)iijd5 5nxuw forward. You can imply i5uhi0 uqg8de4j s xmw*n05) ifrom this that the bus's

  You are standing in a moving bus, facing forward, and you sut igmq0l+cc: 8ddenly fall forward as the bus com+:i 8mg0clt qces to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe tqp 0;es ssov6,k 1 y,x(vvpt*rhe motion of the object.

  The acceleration of an object 7l1we alj+yy pia(3b :is inversely proportional to

  A net force F accelerates a mass m witda.2bdt,bwt z9 s.)gk h an acceleration a. If the same net force is applied to mass 2m, then the acceleratio)z.s d tbgdt2. k,abw9n will be

  A net force F acts on a mashl-c6 z9uf; ups m and produces an acceleration a. What acceleration results if a net force 2F acts on l;uhfuc-9z 6p mass 4m?

  If you blow up a balloon, and then release itrd4dz6l8da1 p(bt .rs, the balloon will fly away. This is an illustra r.zd4s 8dlrdpat 1(b6tion of

  Two cars collide head-on. At every moment during9s.- ;a rr4naa*kfr ;au yc;oq the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exertskr*u;rs-yaafq ;n 4o;ra9c a. on the first. This is an example of

  If you exert a force F on an object, th/ olw2eq3fzv2e force which the object exerts on you wilwfevlq o32z 2/l

  Action-reaction forcesx9plq*o td6m vpy;(4i

  Action-reaction forces a01 bkw7uicbigx1d: 7y1 exnz, re

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the cakd *pw)ta bz13 p67uanr. Since a lotn7pata u k)dp*1bw36z of damage is done on the car

  An object of mass m 8-n+dxifdi2dt;6k +v vf vh+usits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?+fvd;- +vv txk d+uinfhi2d68

  A child's toy is suspended from the ceiling by baq ao98mgq( zx-r+;86sibs i means of a string. The Earth pulls downward on the toy with its weight force os6-aqi9b(io;8 gsm8 +zqbarxf 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 inst 4w3gvfua2zo u:,d k jz60tpl3antaneous force. The ball hits the bat with an instantaneoov,z :j0kt23f6du34wapz u glus force, whose magnitude is

State Newton's three 4jbypr0*illgve,p z-y36l s9laws.

  Mass and weight

  The acceleration due to gravity is lower on,kk;ybr+v0mmnvquvdj3+ty/n a7c0 bu57 z.q the Moon than on Earth. Which of the following is true about the mass and wtu+zc, byrnyq0b7;qm0dv3/ v ma7v5k k j+n .ueight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force5i yuhh* 8l2is which acts at a distance is

  Who has a greater weight to mass ratio, qw08v)h*q6z negb +iza person weighing 400 N or a person weighing 600 N? 8zgn0* hb)eq vqi+wz6

  A stone is thrown strai g 8ivipgl*wd9 2bl.i4ght up. At the top of its path, the net force acting on iiil gibv*p 92.4wl 8gdt is

  A 20-N weight and a 5.0-N weight are dropped simultanev(tbnm qomot; yb 5 d/tkj3hsg29(vml)h8w-5ously from the same height. Ignore air resistance. Compare their accelen28v q )b (53tj9dmghl(oymswhm- otv;t kb/5rations.

  A brick and a feather fall to the earth at their respective terminal velocities de4,8tt/q 3ufusr ;r wpy-bd3. Which object ex8,wst-d /ru3u ; y pr3bdf4eqtperiences the greater force of air friction?

  An object of mass m is hanging by a stri ak6 6fhze)db(3r wp8hng from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension i)6 (e b83 afwrdkhzh6pn the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. 5j1 yyje3wf +zgkv2k 8+o+h qr The elevator is m5r jeg31hf ykz++8ov+ y jkwq2oving upward, but slowing down. What is the tension in the string?

  The force that keeps you from slid ltp vjlh o4hr/b(449cuy4ipk0 *juw/3dc8vying on an icy sidewalk is

  It's more difficult to start moving a heavy mra4/3y5tnlc pb8l9 acarton from rest than it is to keep pushinat4/y5n9brml3 p 8lcag it with constant velocity, because

  A horizontal force accelerates a bo .k /*syz/j t acxctkmx7m,*c-x 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 exception that the horizontal force is doubled. What happens to the box's acceleration?x .yamt7 k**ckm,ccxt/- sjz/

  A packing crate slides down an inclined ramp at constaj-imxk8gn6uea.+f * sr. wq8unt velocity. Thus we can de ewsaj*+kf -.ru8x 8qn.ugm 6iduce that

  A block of mass M slides dojgi4 icmtqk (0 wwh633wn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block4qw3 k6mc wi0tg (ihj3 is

  A block of mass M slides down a frictionless plane inclined at an 2yk9a24 v1r y/sf:nuls hc.zkangle q with the horizontal. The normal reaction ff nk c 4.9uals/s1yr2 2zyv:hkorce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an xv9gq,wz 5 ,cyt12rqiangle q with the horizontal. The gravitational fo9q,w g cvy r,x12z5qitrce is directed

  Two toy cars (16 kg and 2.0 kg) are released simu zl skeo 3)y cgko*m5t)g 17gjov07q:gltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which bkygje5k*3tqgv)gl10 o m gc:7)7 ozo sest describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied t+.te)h* j4c. b ucji9ixc fj.oo the object, and it ace +jhxocfbju). . c.t *i4jic9celerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can ac69 twd xjrof8-celerate from rest to 27 m/s in 7.0 s. What is the averagof8wd96-j t xre forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 mht33 qcmb1 n9 wlwv0d;/s in 2.0 s. What is the0d 93blnc ;vq 1mwtw3h net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires aj+6asvn v: br58og 7fd speed of 50.0 m/s after traveba 8j:5v 6sf7+rgo vndling
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 forccjn gl/t(ifo :j.:cb; hb-/wue that you push a 10-kg mass from rest:(j j:ho. nbc;tb/g /f-iwclu,

  What is the mass of a person who weiip;faek +7hi hyl( 6k5ghs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eartep0 )32f-et-54 iwem 3 j syenu9uaxaph where the acn -jse-ame02) u49ia3uepw5 xp3t yfe celeration due to gravity is $9.80 \; m/s^2$?

  An object has a mass gn37f b oqb c+o0ja)1iof 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is onlyq3 na1b)o7o jci0bf g+ 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. 3o 4k3ocpee(hThe Moon's gravity is one sixth of Earth's. Compare the mc3p(4oh e keo3asses of the objects.

  Sue and Sean are having a tug-of-war by pullin 2m7; ,qdcncyy*av1ml8jb fz ,g on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accely8,va l;1c,b zqyn mmdc7 *jf2erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A forcedjp8u c- ji4(z F acts on the stack, and it acceleratesuj (j 84-pizcd 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 elevat/r x;8id7(u cn:jyb6q* p8jaxe hkk. bor. What will the scale be reading whpy abq .68i b;* j :u/kkre(8c7xxhjdnen the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the personf7 a( kssb a:3f,wn7pt is 60.0 kg and the elevator a ,stf:ws(7b apanf3k7ccelerates 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 ele.c fzl9k k6f*zp;p 0ea(cbt/ ivator. If the mass of the person is 60.0 kg and the 9pa*c 6ktbc ezfkpi ;zl.0/f (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 4zf/ tv:orz2j magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What i rtfo:v4/jz2zs the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is j:ws yg6;a7sxa.oa ,oy t 5woatp4j)4held in place byoywgj44paoajt7 sxy)t6 : w5s;. a a,o 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 the cab?

  An object of mass 6000 kg rests on the flatbed of /kv 4osloefdf 4kb+gk:g5 (4qa truck. It is held in place by metal brackets that can ebk4kfgdov4/5:f e k (4gl+os qxert 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 the cab?

  In the Atwood machine shown in Fig. 44o 2 sx1oyz/+c ;qeicq-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitud/c+eoqi 2s;4qycx1zo e 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, wh3whofs vts 2ca w26h37at is the tension in the string? (2ft 7s6vw o2chsa33h wIgnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizo8n5eu9a3 ;qyjqs8)jkw zj ut0ntal floor with a force of 100 N in a direction of jz8 j9ntu0uwqkys3)a;ej5 8q $37^{\circ}$ 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 with4jyg pny,lc4v.vze1483t 1p ykzo2 sf 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, gn4cp vz vey jk41tyzo2y.l8pf 34s,1 what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as sf*f;gwf 8 0lsshown in Fig. 4-2. What are the tensfs0w*8 fgl;f sions in the ropes?

  In Fig. 4-2, if the tensions in trp8nof, ke3i.*c s+ow he ropes are 50 N, what is the mass of the traffic lighko,ros .wc*pi+8efn3t?

  Two boxes of masses m and 2m are in contact with each other on a otwy:s:2ej9v .njp8u frictionless surface. (See Fig. 4-2:t8j.y: ue9vwopsj n 3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a j-e0x pb5xykhub t9h,3v1 b8cfrictionless surface. (See Fig. 4-3.) What is the net force on the more massiveye,-53hu0 h8 bkb1b cjx9tvxp box?

  Two boxes of masses m a(lw0dbo2 ) xaqe+9aj snd 2m are connected by a rope. (See Fig. 4-4.) If the forward force dqes(bxa j+2)l0wo a9on 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 dl5q pf8 s66g-z0 vrh d,x ,lujr-zc-irope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the ac8pz,rlvlg5-f u6 d-jh r60zixqds- ,cceleration of the less massive box?

Two boxes are connected by a cord running over a pulley ap/rezv do4)/ us shown in Fig. 4-5. Bo/oep /u4d zrv)x I 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 f6v.l6jd99 di.z 2 lpyroq*pe.ra+ mjcrictions between a 3.0-kg box and a desk are 0.40 and 0o..r9jriz.+a62j*p9 m l 6ydd vqe clp.30, respectively. 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 frictions for pte1yogutfkc (t g3.gm9o:6 z 7lastic on wood are 0.50 and 0.mfc 7o1g3. z6tg eukt 9togy:(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 levujb-3/wmt zd;: ln6 i7sa,n bnel surface in the +x direction. It slows and comes to a ubsidaw,nj: 7n 3 t/nb6 ;ml-zstop with a constant 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 on a horiz)fayaj 4v*g3pv 0xzdlvi;* d5ontal surface is pulled by a 5.0-N force. A 3.0-N f )0*p*v5 yz4f3lax dj;avg dviriction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N :v0igfs2pdahl4)*pz 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, )l9 g*x7/ht qovdp0 dga puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. Wt/ g7vgh dp*9 xlqdo0)hat is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find u 0.hk))ob 4gdfc4hvimr)e p0ii1a l2 skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway20)o ibl 1if4p vm rki 4hd0a)hc)geu. 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 kpkif,s.gl4(l q;+m zFig. 4-6.) The surface between the more l,m(4 kl fpqk.i ;s+zgmassive 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 friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface y 46m sogv1s,+42j el/uebtv xbetween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mav4o ,y1/s 2ve4btmu +gl se6jxssive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a fricqnv6oluia. n2)c1 yvit d768ctionless inclined plane. The plane is inclined at an angle 7n. 6dvqc12l)6vycont8 i iau of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle bs74:+yux7m yuttdb * 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 widox0h3 jvcgsso: -2n5th 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 an angl o:yrme ,awhlo1e; 00je 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 directlgu0 h/8tc 51b n1eahilg6 iqefng(4m)y down an inclined plane, at a constant velocity of ) i60cbt(ghq8e41nm15fhg inla g/ ue6.0 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 dkwt u2 b ,nl;)/wxtia5own 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 rougho7o; fsq g4cr,i;5 frf $37^{\circ}$ 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 weighinggqu a9 zwo5tnf9q )d9tf1wa ,s;u+z/g 500 N along a rough surface. The cable attached tw9;dt)f 5qf+znq9u/t9 a,waoz1ug gso 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 tilt.c8.7i: rqqc)x.ao zmn3jdjh ed at an angle oc.7x j. dzohqi:) ar3 mq8jnc.f $33.5^{\circ}$ 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 wtp sj 4r9e4rwbsiq0 xk.)i3)angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static wsris 0k tr.wq4x)epj39i b4)friction between the object and the plane?