Which of Newton's laws best expxu+ o 9zja;2x4z n9wtalains why motorists should buckle-up?

  When you sit on a chair, the resultant force on :c,/hy uroyq n.z:6ij5 jw )mryou is

  In the absence of an external force, a moving+c . hqfwvew/3-wq j 6vd :dzknmu06s1 object will

  When the rocket engines0t8b0pubkl f ;pw2lm 4 on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty spap4;t802lbluwb kmf0 pce, the starship will

  A rocket moves through e.2nvq: ql 5dteex86j rmpty space in a straight line with constant speed. It is far from the gravitational effect on :5 6lr.tdx2ejeqv q8f 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, and you sudden9p5 +t+awj gcyly fall forward. You can imply from this thaj catp5 +y9+wgt the bus's

  You are standing in a moving bus, fxqgg2 :-c3 0juhlcl f0acing forward, and you suddenly fall forward as the bus comes to an immediate gchl xfq-cu 23j0:g0lstop. What force caused you to fall forward?

  A constant net force acts on an object. Describe(- ,g98 di6ce uhtiigo1l4 cww the motion of the object.

  The acceleration of o(l83 j.j8 zalla/ uegan object is inversely proportional to

  A net force F accelerates a mass m with veau b:l)*n i4*o .q6xc yie3tan acceleration a. If the same net force is*q icev:)6 *3ixbt. aeulno4y applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and p pqqe;)a fq21whn,d.j 2yuy 1ak ow)0produces an acceleration a. What acceleration results if y0 21h,qayw)ae )u. q1w qk2f;pnjd opa net force 2F acts on mass 4m?

  If you blow up a balloon, and t0r avcsd(bi,v/l/m0wc8e (v then release it, the balloon will fly away. This is an i l/rtm(cd0 vs/w(ic8v 0veba,llustration of

  Two cars collide head-on. At every moment during the collision, ubrj gjr yknu93ivx :h;-p3a* .k:u3pthe magnitude of the force the first car exerts on the second is exactly equj3pjn 3r:.hgu k ar y:pk-;u3xb9*iu val to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the object exerts-lcpno/g:x 6 oqtj j/ 4 yzuztnf f8)z7m/eu8; on you wil8tuuzp46 z xj/emy7f;:gjfc /)on- n /oz8ltql

  Action-reaction forc7z 5nkiq xv55 m on9oupbmr2(0es

  Action-reaction forces 0yc//1 3tn npfvjfr8bare

  A 20-ton truck collides wauz0:z zto w17ith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage70zo w: zutaz1 is done on the car

  An object of mass m sits onhjvan h* q8otqu6 y,l0/mc:: f a flat table. The Earth pulls on this object with force mg, which we will call the *tchom 0 la,8vuf :6 /qyq:hjnaction force. What is the reaction force?

  A child's toy is suspended fhy)pth6) t ,ysrom 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," what is the "reaction for)y 6y ,t)sthphce"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous for.x ( xe2cx/wexce. The ball hits the bat with wc.2/e( xxxex an instantaneous force, whose magnitude is

State Newton's three e4 mgylmu7b q3(0wek/ laws.

  Mass and weight

  The acceleration due to gravity is lowemfdrm9 jx.o5uo -khndr*508tr on the Moon than on Earth. Which of the following is true abou95m5hdo.d*oj rxrm0ku n-ft 8t the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actics0 dzi,q,vfi jf2p46hmm*st-+/p r5 +q dges at a distance is

  Who has a greater weight to mass ratio,i .--ql dtun2q.9 uzhp a person weighing 400 N or a person weighing 60p9uldn- i.z.q2t-hu q0 N?

  A stone is thrown straight up. At the top of its path, the net force ac jf6f/co iz1sp o59vd* q*nu1fting on it is* /v1zpo19fs f 6ou*jqcfndi 5

  A 20-N weight and a 5.0-N weight a9s8hq9l)a u2 zlqg(c :kisdz2re dropped simultaneously from the same height. Ignore air resistance. Compare their accele)licg 92zzlk2 (qh:uqas 8sd9rations.

  A brick and a feather fall to the earth at their respectivsh5ilj/j 0c1dzg-. 5sdu * zere terminal velocities. Whis l chzji.dzjs1 d0/*e5gu r-5ch object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an e0 9; lwppec,vjx8f4eh levator. The elevator is moving up at constant speed. What is the tension in thejxl0cw; 9 v ee8fp4ph, string?

  An object of mass m is hanging by a string from uwm x1qs)c2 7,rle+i wthe ceiling of an elevator. The elevator is moving upward, but slowing down. What iswc+) 2 , weu7mxrq1sli the tension in the string?

  The force that keeps you from sliding on an icy sidewaf 3njd6yrny w+b 7q pi1li):3xlk is

  It's more difficult to s z qa-n(,0l4zax fxkc(tart moving a heavy carton from rest than it is to keep pushing it with constant veloca,(zlz(n ax x4 f-k0cqity, because

  A horizontal force accelerates a bglvm(bid -..b,b b hn;ox from rest across a horizontal surface (frictio(b bvg nmb;.hbl.- ,din 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?

  A packing crate slides down an inclinedm)or3h30x / s ,a4btf6nmevx v ramp at constant velocity. Thus we can deduce t hs4n3 oemfv3)b x/ ,xramv06that

  A block of mass M slides d t9qg5w) pjxs:own a frictionless plane inclined at an angle q with the horizontal. The normal reaction fort) 9gs5w jxqp:ce exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at aniksi anju. z, +/us8h8 angle q with the horizontal. The normal reaction force exerted by the plane on ,kssa .h8/u8z n+uiji the block is directed

  A block of mass M slides down a frictionless plane inclm8odi 44 n0xxpbcuns.2w6k)m z.o /dhined at an angle q with the horizontal. The gravitationand. b 4h8pxw6/mu.x2okdo)i04 zcmsn l force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incjex7 gjtt gy74+.tt3r w.(ydolined plane that makes an angle of 30e with the horizontal. Make a statement whx(eggyjtr+td3y o j.w7t4. t7ich best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appgk2k:n; ie sugtu9, *qlied to the object, and it accelu2kg9i,*g ;tesq:kunerates 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 27 m/s il u:iz+u 1 3*rr jf9lmf89cuctljgc;,n 7.0 s. What is the average f; fuftu j mlzglj3,u rcil1c9+:* cr98orward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.+gli+r3w ;j/c e 7md acg0un;o0 s. What is the net for;wg+oadc i0r3l 7cu/+ngm ej ;ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquired 3e: (y 1s .el 0e*xm0lwojumok18muds a speed of 50.0 m/s after traveew(y:o *s d1x.je00o 3 1umlu me8lmkdling
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 wit;ehrl ld95 vlq)0;ubeh the same force that you push a 10-kg mass from rest, ql;;v50) eleb9dh rlu

  What is the mass of a person who weighs 110 ln*fapwlk *4uu;wd t5; b?

  What is the mass of 1jaec8rh 0(fh ytwirs g-o) 4,an object that weighs 250 N on the surface of the Earth where the accele()-4, of10 8 heti yajrgwchrsration 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 the obj1tkeq0b u91lf2l) bb dirc); cect on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earthtql09u1f2; ) dbc1 ckb brle)i?

  Object A weighs 40 N on Earth, and object B )th z.yixi7f-+nrk /vweighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Com7 ktvf z/ir.xi n-+)hypare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opb j24f6qx v g,skkpu+.posite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's for, vk.gp26usj +f4 xkqbce if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surn+ 1vy xvw, *9wvy7hswface. A force F acts on the stack, and it ,vww*wy 7vx9ynhv1s+ 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 Nu,o jjr85k) p5f;ttcf1 ze6re stands on a scale in an elevator. What will the scale be reading when the elevator is aczefj,p;5 ruto8rf5t)j 16keccelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person (vh,5cn vc7 feis 60.0 kg and the elevator accel,7n5 f c(hcveverates 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 mass of the person is 66t,;ctf /xkpi 5(/8tac ifl w n*xur4e0.0 kg and the elevator acc n/ ti8xtc(fl6k x*ue,;ft5ca rp4i w/elerates 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 magnit:,iajc8ltto (ude of 8.0 N and is directed due north. The second force toward the east has a milt,(ca8 t:j oagnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. ;juebky;- k)e It is held in place ey;kk-)j ub;e 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 the cab?

  An object of mass 6000 kg rests on thr; n2 m0uhi g90)xkwaie 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 theigm)a u rknwx ;ih2090 minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, ijnwj9 i2 q;d(jbah* i(f M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignorb9i d2 (nhjwi(;j *qjae friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m sjk4r+b: b6 kt= 0.40 kg, what is the tension in the string? (Ignore friction and thekj k:+6sbb4r t mass of the pulley.)

  A student pulls a box of books ou+g1w;jez. 5ykzw. gl n a smooth horizontal floor with a force of 100 + w.gue wz5l;.zykj g1N in 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 smooth horizontal floor with a for :m*5j*m ,a-opodr8ur +gm fytce of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 4opuj*g*ya m mro,:+-d8t fr 5m0.0 kg, what is the normal force on the box?

  A traffic light of weight 100 q 7 tcsn4ww- a7q iklc;ig)3y+N is supported by two ropes as shown in Fig. 4-2. What are the tensw+ a; qkq)4lt3-igcsi77nw ycions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50hu e4tjowxv)n9 +(h;q N, what is the mass of the traffic eh9t4uw ;j)n(h+ qovxlight?

  Two boxes of masses m at+sx dzigh*(1 nd 2m are in contact with each other on a frictionless surface.d(i1*+zt gsh x (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m a5h lm r7o7op1ore in contact with each other on a frictionless surface. (See Fig. 4 77mlh roo1o5p-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. 9z 10i zoqn:hzdmth kq-gw/-*.q;hid (See Fig. 4-4.) If the forward force ohq0zhw 1-knqidmhtgod:q z;z .-/ *9in 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 Fig. 4-4.)(q*j smmwy pmk 0i-9t) If the forward force on the m sytm)kjwm (9*iqmp0- ore 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 in Ftum d9kobow:hu 60h24ig. 4-5. Box 9b2u o6hu:odw tkh40 mI 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 frictions between a 3.0-kg cm tz :+*.0jvpa *j/j ads6nc,,xducsbox and a desk are 0.40 and 0.30, respectively. What is the net forcmsv cd*/60xj+z* d,acta.scn jp j:u,e on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plasticaook +j* ,,nhyt/(z-jh;hqo u on wood are 0.50 and 0.4(no a-+y;z* to/quj h,j,hhk o0,
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. If)cxtk:b eq*e 9h.f 2nt slows and comes to a stctx)bf:ke .h *2nq9feop 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 horizontal surface is pulled by1 7 5j.fdr+i,pszyp( xgm/; e5kbqpzw a 5.0-N force. A 3.0-N friction force retards the mopxz+qmer(f /,5yg is;7. bpjd wpk5z 1tion. What is the acceleration of the object?

  A horizontal force of 5me dsx j8 ;oi+y o,:4 y5q)jne-/vvhek.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 initial speed of 10 m/s. It sr; b eluh*;mdvp h0h-)lides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?lh e- hr;hd*m; 0)pbuv

  During the investigation of a traffic accident, police rii,n;z:qh x3()+hyypj tei p4.y1 ddfind skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.5ti z y.(1i;:xh4)pr+ddi hne3,yjp qy00 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. 4-6.) The su0iye;;w9 okydgwjx j(v12w i 0rface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box doejy i (d01 ;vj2gwey;wx w0ko9is 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 sur (1vzm51 ysnbvface between the more massive box and the horizontalsv 1bv1(y5znm 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. The plane is inclined at an alo5 8czfr 6 hmbl* ;7)66jfume -alxtvngle of x*fal5e b6f6 )l tzmcmlh6u8r -voj;7$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a frf7ziv8odt (9w :urbl 7s 2k17x 9ofmjlat 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 p +l m iv8kh9a2tg8v3nzlane 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;tc lh/02i8wp1 e myhf 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 inclined plane, at a constant vep,pqvxz+gg: p 52: rdalocity of 6.0 mpqgd,pxr p vaz2+5::g/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 rough7oif g y;j*zbi6 g.y8i $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slidep,. druk0l wg7s 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 sur/8wggztpt8m/;o mtj5 face. The cable attached to the log ; z/omt/85wtgjpgmt8 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 dt+jx/myi ya0g)w,;ya h( yl3rest on a rough inclined plane tilted at an angle 3jdmay;t(0 yyy +xi ,hgw/a l)of $33.5^{\circ}$ 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 planvp0ykp d7j(m/2ml. 7yws t j7te. The 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 friction between the object and theymj p 7y 7d0 (mtl7wpjt/kv2s. plane?