Which of Newton's law6wuf/m tmt+a 6;..xfwff o i/is best explains why motorists should buckle-up?

  When you sit on a chair, the reex2*8i itkd+o sultant force on you is

  In the absence of an external force, a moving object g p-8 dq gbv*y.t,dz/jwill

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudden62c+ttt lnc*u ;2kmbu ly turned off, while traveling in empty space, the starshiptm;+tccuut *l nk 22b6 will

  A rocket moves through empty space in a straight line with constant6f)ia7 8p u /9hnodc/kjhqr*k speed. It is far from the 6up/n7 dohj a9*k8)rqhck/f i 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 is

  You are standing in a moving bus, facing forward, andn fce75p b8ti6 you suddenly fall forward. You can imply from this tp enc8f56ti7b hat the bus's

  You are standing in a moving busu/1 :hgnrj.r g, facing forward, and you suddenly fall forward as the bus comes to an immediate st1 g:.jr nug/hrop. What force caused you to fall forward?

  A constant net force acts on l 06*e 3cadimrx).ks6 i bo4qwan object. Describe the motion of the object.

  The acceleration of m5zrtcp(/cc+an object is inversely proportional to

  A net force F accelerates a mjej1 v/y1 zca 9enl+;gass m with an acceleration a. If the same net force is applied to mass 2m, then tanv; je1/1 eyz+9lgcjhe acceleration will be

  A net force F acts o q/i 0c8(*ekqtebhq2zn a mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass 4*zb8(k/q 2q eteih0cqm?

  If you blow up a balloon, and then release it, the bd;3min a kdops:0 mk,8alloon will fly away. This is an illustrat mk0 m,: p3kiso;d8nadion of

  Two cars collide head-on. At every moment during the 0;jlgg59j)u vh wq q8t3w ugqe.e)m.x 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 exerts on the first. This is an ex)j8qwwhut3 .ge mq )50vjl xg9gq .ue;ample of

  If you exert a force F on an object, the force which th/ er mpv+vmgm1;k93z kh ;xo.ae object exerts on you wik9+zvre m1kmg.;;o xpm/v ha 3ll

  Action-reaction forcevjfdi4 , 3lyr/s

  Action-reaction forces arecy j cc7z5p*9(fjtyy*

  A 20-ton truck collides with a 1500-l8fvmxst25 *u 5qglzo c44h w9yb car and causes a lot of damage to the car. Since a lot ofmsgy*4 u5w2zct8o94x q 5 flhv damage is done on the car

  An object of mass m sits on a flat table. The Earth pu tsj7bvhladr :u9db.i ) o*5+plls on this object with force mg, which we will ca s9. hu7opjt:lbb)* d+iv 5adrll the action force. What is the reaction force?

  A child's toy is suspended from the ceieaf6 j,ud9oysh2*q6qling 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," what is the ya fe 2*dso6quqh6,j9 "reaction force"?

  Your bat hits the ball pitched to you with 5ehc mlqf7-3 zb1 ujo7),kyzza 1500-N instantaneous force. The ball hits the bat with an instantaneous f1uq zk,735zbl7m ecfz ) yhj-oorce, whose magnitude is

State Newton's three lawshdvew-kr0 0jau 6rw *( 9ft6ei.

  Mass and weight

  The acceleration due to gravity iskzl 1 ykedh;t wmq4)-0/e h.pz lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astwzdh.0 eltkh;-z y1q)4mk/pe ronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a di f5j(e6hlui )nne83z7sge * tystance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person w)( ypb;je+t) g ,qrnxgeighing 60 )+)pq ,;b gjrxyne(tg0 N?

  A stone is thrown straight up. At the top of its path, the net force acti*m lpv9z fl6v7ng on it is97lvfl6zp v* m

  A 20-N weight and a 5.0-N weight ach8ze zwo+-n0re dropped simultaneously from the same height. Ignore air resistance. Compare their acceler o0wzencz+- h8ations.

  A brick and a feather fall to the earth at their respective terminal velociuu 943 ptrfmc.ties. Which object etfuu9r 3m4.pcxperiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Txpxe9s: ft(d )he elevator is moving up at constant speed. What is the tension in t(9x f)eds:px the string?

  An object of mass m is hanging by a string from the ceiling of vgd)01 ogg rz5od /mz(an elevator. The elevz )od15dvrg (gzm 0o/gator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps yoj8c9 6/gi gj srua.e7nu from sliding on an icy sidewalk is

  It's more difficult to start moving aht.533by ; ryli mnm,p heavy carton from rest than it is to keep pushp;try mm ib.5,l33ny hing it with constant velocity, because

  A horizontal force accelej lgw/h4 9p1sqrates a box from rest across a horizontal surface (friction is present) at w9h/ gjpl 41qsa 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?

  A packing crate slides down an inclined ramp at constant velocity. Thus we can w1 q;gj (n;db64h0 psuwqyso8deduce tpu4jw 0 qssydw6bhng(;;q 18 ohat

  A block of mass M slides down a frict1j-ve8 cqzm t2w5v vr;vh1kxra65 6ecionless plane inclined at an angle q with the 5h 81 -65vw2ctarkr jveze 1q xv6cvm;horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle qm m;xh5:;mk j6xi5o0csj fk+i with the horizontal. The normal reaction forj;c+mimk;mxk6fh 5xo :50i sjce exerted by the plane on the block is directed

  A block of mass M slides down a frictionle n:5e8(a1u jumar fmy+ss plane inclined at an angle q with the horizontal. The graviy1u8mnra m(f au+:5jetational force is directed

  Two toy cars (16 kg andqcfdi72 k9tss*p xqmnf*g73ry q, k6+ 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whi,fq r9if xkytds m*gkq727 q3sp6 cn*+ch best describes their acceleration after being released.

  An object sits on a frictionless 8,clpsdn )z 8q,l/ dgusurface. A 16-N force is applied to the object, and,gdln/c, 8)p u8s ldqz it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 2wohr-0qya 3y.g8w.n r7 m/s in 7.0 s. What is the average forward fogwna. -w0r3roq hy8y .rce on the car?

  Starting from rest, a 4.0-kg body reaches a speed o zshm+m8*j o118c szvof 8.0 m/s in 2.0 s. What is the net vs18+jsz 8mc*1zho m oforce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquin4w17 ) kc 0mcik-lhdvres a speed of 50.0 m/s after tra 1h0 li-4wknc7dck mv)veling
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-kg mass fro)t.olv sbius ) w rr:b51m2bu5m reub5i r.:sb msrw ob)1vtul)52st,

  What is the mass of a personm* yi3sr4p m: wwu59dw who weighs 110 lb?

  What is the mass of an object that weighs 250 N on e e1k 67 eyze . kvnpoqvq(p4o2svi7(3the surface of the Earth where the acceleration due to grezv(q4 o 26e3iop17peks kn.e7vqvy( avity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of q9x-fwm6lkih evvd+ (q5 * h*uthe object on the surk6e 9iqdql+mh*fw5*(v-h v uxface 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, and object B weinisrhw tbz8z0 bc oyl5y;q r0+xb10/-ghs 40 N on the Moon. The Moon's gravity is one sixth ofw0hln +isc -q0y rz81yb;b0 o/tbr5xz Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by d.(kskqet i8/ pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. Wh8qdek k(/its. at is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionfiohg 3emdm8y)) d 5n)xdh09kv-c4dbless surface. A force F acts on the stack, and)ied4dmm5f)-hk) ox 8n3 09dd cgb yhv 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 the ssamiy 5 lz1,8awvl*5wcale be reading whenlw,mw5z18l5 va *iasy 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 person 5mr -n3w z.rt, io:pe- ;l0fq9qbzaqr is 60.0 kg and the elevator aczm -5q,etqi;rq w-:zl. p b9rfno30racelerates 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 elevatyc bk9zop t,6pniw5/2or. If the mass of the person is 60.0 kg and the elevator accelerac2t6 kp/9 wnz5 io,pbytes 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 h1ge.zj*m/k uhas a magnitude of 8.0 N and is directed due north. The seco/m u.j1g*kzeh nd force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of k52sibu8nh4a -n,v rz 6vkb9in 3c.pja 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 distance if the load is not 2phsz5k in.4 ir3nb9ujv-6 8bkn ,cav to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in plac1e/4d1 epgi 84p*ln x yaep.pge by metal brackets that can exert a maximum horizontal force of 9000 N. When the tru a148 pg1y/ipnedp elgp4x*.eck 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+;;bgbq c q).iek5ube shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mas;5b )qbek ebq cuig.+;s of the pulley.)

  In the Atwood machine setfejpxk68fsbv c :))c; ge+ymh,5d9tq9 :qnhown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fric5e6f) , m:kdh9fcbt;e: g pse9yjvqn8t) cq+xtion and the mass of the pulley.)

  A student pulls a box of books on a sm 2* bqiwbgh 0va)s+b5ec9 gz(oooth horizontal floor with a force of 100 N in a direction ofsabgb0 h(9 iq2)go*zcv wb5+e $37^{\circ}$ 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 hor 409 (itlfj4eh touot9izontal floor with a force of 100 N in a directio ( l90iu jthtotfe44o9n 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 supu+moaov4k , v6ported by two ropes as shown in Fig. 4-2. Wha4avoo+vk6, u mt are the tensions in the ropes?

  In Fig. 4-2, if the tensions in t 2r 4jysu8mxrkar3pwg :y0,-khe ropes are 50 N, what is the mass of the traffi 0wk4u8prjgsxk rym,a:2yr3- c light?

  Two boxes of masses m and 2m are in contact with each other on a fri rsc:cc/qv a:3/pml c1ctionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bo3 /c1 lmavc:/pc:rqscx?

  Two boxes of masses m and 2m are in contact with each other on a frictionless hz,n+zq )3p- ypbj6s psurface. (See Fig. 4-3.) What is the net force on the more massive), y pjnz6spb-h3zp+q box?

  Two boxes of masses mf(c/y37fdc w6ivgnj))k2jkmj we2 c: and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is 22y:cwc( 7d)vf/ ifg m )63jkencwjjkF, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a nnisdav95rmr6-39b y rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massivs96b-rd9 3aimr nnv 5ye box?

Two boxes are connected by a cord running over a pulley as shown in Figqv;pi* 4 yhr.gjp83dx+gk zc0 . 4-5. Box I of madxc ipz+gj ;4 p3yvqhk 08*rg.ss
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 frictiontbrjc:b u wk,4f. je,8s between a 3.0-kg box and a desk are 0.40 and 0.30,f,r 8u,4 e.bjjktcw b: 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 k jz, f6j i5j7yc5kc4jqinetic frictions for plastic on wood are 0.50 andjfjjc7 zk45q 56,ci yj 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 cojtvb .8zutk6nf zua7sa3;z +/mes to a stop with a constant acceleratio+n zzbu83tva.6/k7u;fs t azj n 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 1 +tztemv6/mlf)aaq g23 r3 ydis pulled by a 5.0-N force. A 3.0-N frictiot 3y1tarl2 a)fvqdme6/ mzg+3n force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg maibo)b3 f+ a1jvss, 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 injwn+k4iy0yda* 3lfk 6 itial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frictii *jwak60 +f3y4ykdln on between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 );ei.5gl )i4f aj jkid6t- m*gax f,ulm long. They determine the coefficient of friction between the car's tires and the mgl56. ;l 4ea*f jjgtk) ux)f-iidai,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. khx.jit6cs) 0 (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth axi.j0k) h6ct snd 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 F 3 u91,ehkmpzw5at;nnig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes i1eu;t 35a9 ,npm zwhkns 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 pla .iomk6e+tta2k5k( zdm0l8vd ne. The plane is inclined at an angle d0at+vel (6m tiko5. k2km8dz of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that xt 5q)ju2yw; gmakes 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 with an angle ew :7qqdd( ;jyw+g-6)s fxo6ezti+ eepzn/ ; fof $37^{\circ}$ 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 inclj3qt; x -c wr0/kb1dwn ii6w;bined 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 dir nddi)* *(5i wbh*ss(rh hcsv4ectly down an inclined plane, at a constant velocity of 6.0 mhn5iis( (*vswhb cd dh*sr)*4/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 sh9a*m jxw yq06lides 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 ro1 hm) ox4 (ije+4kc/eqyqak2vugh $37^{\circ}$ 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 rougay3ie4sg;-jf:9k5qwlyohq ; h surface. The cable attached t9sg3al oqy :feih5;4;qkjy w- o 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 relew-pi;a wdty eogin85n3 o0 fr35y4oh4ased from rest on a rough inclined plane tilted at an angle o0 h4enw y3;pwanoi3or55igytd o48 f-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 plana+0(0g gs(6; dzqqznj dzll;oe. The angle of incline is gradually increased until the object begins to slide. The angle at dnzz06lo + gsza q;jg(0 (l;qdwhich this occurs is q. What is the coefficient of static friction between the object and the plane?