Which of Newton's laws best exyhq h ,vlk9osdyu j.c.gp 2j8ou8m 7*0plains why motorists should buckle-up?

  When you sit on a chair, the resultant force ox7 5acib6gy*/g*( bbnp )dlr nn you is

  In the absence of an external force, a moving oc kj4*4)c n( ndxklz3ma p3k8fbject will

  When the rocket engines on the starship NO-PAIN-NO-n/.qqy6b5 aos2:yj miGAIN are suddenly turned off, whils/ :mjyb6q5y2aoq i.ne traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. I 0x.e-5ft 3+e 8wynb1tjwm n: k--tggzs)nxjr t is far from the gravitational effect of any star or planet. Under the0g 5gx3y-ftsn:tjrw)1tmw kn- e 8 -z.enbj+xse conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movingr4 elbf ,nz 9s-zr3ju 5v/0phy bus, facing forward, and you suddenly fall forward. You can imply from this 9un 5brf zpj-v0syehr,l 34z/ that the bus's

  You are standing in a mov 4ugch;wcl76q 1v, ishubn1i)tv 8b:u ing bus, facing forward, and you suddenly fall forward as the bus co6vt1v u wi)4bs,7uu8gc bi1h;nchq l:mes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the obj5hi*p*w3a5 phxs/7fzsq 3f k ject.

  The acceleration of an object is inversely proportional9c:v 4s1bzch s+)vkvq to

  A net force F accelerates a mass m with an acc9yquud8 1 0k7jyxow,qeleration a. If the same net force is applied to mass 2m, then the acceleration w1kqy,yoj9 q0 d8w7 uuxill be

  A net force F acts on a mass m a pd89o(x: whhqt (2jprnd produces an acceleration a. What acceleration resultp( hdorj:x9(tw2 hqp 8s if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly awazxt,(lmpj2ls l *v3i2 y. This is an illustraix23 ,ptjl2(lsm zl*v tion of

  Two cars collide head-on. At every moment during the collision, the5g 6h c(7ipvsf magnitude of the force the first car exerts on the second is exactly equal to tv6fp (5chg7ishe magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an obje5q64o1 byj4xhhya 5xvn4nzm /ct, the force which the object exerts on you willq4/x zy5a16vm4yjon h 5bx4nh

  Action-reaction forc61h0znpm a 0l9 gnohxtg-/g dx) z30vdg2h2iaes

  Action-reaction forces +(zgvc:kvl t1 are

  A 20-ton truck collides with a 1500-lb car and causes a cigob3 (lte r.)/9hjk lot of damage to the car. Since a lot of damj 3ok9 girh cel.b(t)/age is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this q- f g v-ygb5y6 r;zyxnq3;kq8object with force mg, which we will call the action force. What isqz8;vx35g;fqr-bgyqy 6-ny k the reaction force?

  A child's toy is suspended from the ceiling by meani t8 ;qgam8z (7ddb8plugj;r; s of a string. The Earth pulls dodg;;mqld;g(at8 7 8z puij br8wnward on the toy with its 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 wg 7uwem pqya)a;:,, eqith a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnip: )7;qu,ymaeaq eg, wtude is

State Newton's three laws.5h f3m mi8r/ms

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. f+zmje(65ar6or f ud3Which of the following is true about the mass and wei5 3 rzu fr(m6+j6deafoght of an astronaut on the Moon's surface, compared to Earth?

  An example of a force w bz2ibsqj -g;(hich acts at a distance is

  Who has a greater weight to mass rs9o075yx pby 6.sbuuoatio, a person weighing 400 N or a person weigho7yu s56o.byxu 9bsp0ing 600 N?

  A stone is thrown straight up. At the 6zkw )yazx l(6+b(*6a7ydcqn b anll6 top of its path, the net force acting on itbd*az(nq 6lac + aw66y6z n)y7 xll(bk is

  A 20-N weight and a 5.0evw1qx/uxab7p a 2atw 6f hbsztn :. t9;h(:z5-N weight are dropped simultaneously from the same height. Ignore air resistance. Compare thzt a57h :92 pw ua:aw(thn6 ev t1b;/qxxb.fszeir accelerations.

  A brick and a feather fall to the earth at their respec 5zugn(f0 -g0uc b*lactive terminal velocities. Which object experiences thealb g5nf* ( 0u0uccg-z greater force of air friction?

  An object of mass m is hano.f xd vt )03i+vxqpgq378spjging by a string from the ceiling of an elevator. The elevator is moving u viv. 0q3g)qojtpf8xds7+x3p p at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator 0uxgwx 8b/-d:z8zpn r. The elevator is moving upward, but slowing dow- u 0bzp xgd:88nw/xzrn. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewa+p:;vkde95f ru6gm sglk is

  It's more difficult to start moving a heavy carton from reftfzm1)v:n 4 zst than it is to keep pushing it w)4vz z1ft: mnfith constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal survf ()-afyqviof 7 n5g0u +gcsj4w.gx1 face (friction is present) )cyfw4xvq5v7 -n sa 1(ug.g+ofjfgi 0at 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 inclined ramp at constant velocitrplycnxnp 7gvc,ef2 4+.15a zism6 e) b c6ci;y. Thus we can deduce p l;7,c6ecxrvzga)ns1nb m.ce+f i5i4 pcy62 that

  A block of mass M slides down a frictionless plane inclined x xekm gb 3t swx*1:-8giuv9(fat an angle q with the horizontal. The normal reaction force ex(3xx81 m:g*- egkvwif9utsbx erted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at2 dww)va. d)3x0u ok0nqr pl7s an angle q with the horizontal. The normal reaction force exerted by the plane on th03qa o kp)w)xd.lu270rvnsd we block is directed

  A block of mass M slides down7f1w odqq p9jl;opcj 9/ky0/f a frictionless plane inclined at an angle q with the horij79qfw 10k9l/docpp / fj;qo yzontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslyx:u *mj.unbew1-g s, h on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being re .wu,mh-j*1:n sxueg bleased.

  An object sits on a frictionless surface. A 16-N y.rbk-1 a:/j,bcce xp-.xg g vforce is applied to the object, and it accelerates v.xc r- ,ecg x1k bg.p-/ja:byat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acceleraq 3j +6n7-e klquh9rkhte from rest to 27 m/s in 7.0 s. What is the averag-lkhqr 63u7qn 9ek +hje forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed oy2 9 :wr xcw8kcchza(-ai2;vh f 8.0 m/s in 2.0 s. What is the net force acting on the bodya2axcw z;9 i yhv2cr(:8hwk-c ?

  An antitank weapon fires a 3.00-kg rocket whicyp 87i:cm6wrr h acquires a speed of 50.0 m/s after travel7:rypm 8rcwi6ing
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 wi; ,gpmsne 2wf;th the same force that you push a 10-kg mass from re; pf m;wnsge2,st,

  What is the mass of adx)n8u8jk0sob pv0 m5 person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the su )lhd(*wo 2pucrface of the Earth wherw(u )p*hlo2c de the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on theib/uagwoi7o v72 7qk8dun(v:cbv 5,v+ *xatg Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on th7q2aa7(:kx v 5uvi buw+g/c8*, n o odbvvigt7e Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. Th dsolx0s2fl2rauo**55(b z fie Moon's gravity is one sixt2df *sil xao fu2b5s(zrol50*h of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite e 2bd4 x3.q4p h2evamj zvel/k.f:k- fmnds of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towd2p/k fzx:k-lm eqm4fb..ej4 v3 2vahard Sue at $2.0 \; m/s^2$?

  A stack of books rests on4b:zz vhjkf mu/5/ c2w a level frictionless surface. A force F acts on the stack, and it accelerates at k uh4/bf5wz: zj2/mcv$3.0 \; m/s^2$. 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 sthdf7,z : qhkkt:/ rp)dands on a scale in an elevator. What will the scale be reading when the elevator is accekrdphh:zd7 qt /f,)k:lerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of th0 -cj4c5 t uf3qozdh,kz4mq2 pe person is 60.0 kg and the elevator accelerates downwardokmc3qp djq-4f402 tcuzh,z 5 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 rq+5ynbbcw 6vpp 1;0: :pcwrjis 60.0 kg and the elevator acceleratesb0 1yjqr:rp cp+b 6n;c w:wpv5 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 ha-ixi5 e.. 1updog;mb+bq ui k1s a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the accelerat x1q m- e bio.ud;+ukg51ibp.iion of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held6os2jj kvx4 7xxvz ((n in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is travex2(o74x6(jkz nvjv sxling 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 a truck. Itol :bji6 *52k cae.gkt is held in place by metal brackets that can exert a maximum horizontal6:*k. elcao5igt k2bj 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. 4-1, if M = 0. 5p x5 9uxk7v-m*adzzo60 kg and m = 0.40 kg, what is the magnitude of the a5uo5x x79 *pd -zamvzkcceleration 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, what b2ahgn c ju2o7y7klp4r7 nz:1 is the tension ijza:grb cn2u1o2pn7 hl 7 7k4yn the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force c:-dlod /6c klof 100 N in a directik -/dl6lodc:c on 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 floo i;,xvyme; ze5y*zm5 nr with 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, what iev ;;,y55m*ixzz ynm es the normal force on the box?

  A traffic light of w ep34 a+iip0vn2 r2.fs wao:ueeight 100 N is supported by two ropes as shown in Fig. 4-2. What vuwa+e2i3oa:rspep 2. fni04 are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mmb f+ fpgpb61a17cyq7ass of the traff +yp1ab77 6p1qfmbcgfic light?

  Two boxes of masses m andl:,izjjmx 5/f 2m are in contact with each other on a frictionless surfacf/j5j lz :xmi,e. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a friq *g3xk8**)wxeppi 1+eer* f 7hzbeoyctionless surface. (See Fig. 4-3.) What is the net forz)*poey ekxfp*+he3x7gbw eq1 8 *i*rce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. u8aez5k 3ogo: 4-4.) If the forward force on the more massive box is F, what is the tension in the connectina goe5 zo3:ku8g rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If thxw:d, qh ieqs)ev1s (8e forward force on the,qh 1e(ew dqxi:s8)v s 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 in Fig. ug4:j bad*-zsp( -m;8y opjo-n0ee g b4-5. Box I ofmy-obas gj(pen o-bp: ;0 u-edg8*z 4j 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 kior o3,wvpq*h7z t0)ofnetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectivtov*zh oq)f0 w7r,p o3ely. 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 plastic on wood are 0.k3se+m nk.u) p50 and 0.e+3k .spm) nku40,
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 3c *vkp*d)l/u le16kjasmwd ( comes to a stse3dp1kcdl *)jm(w*/6 v au lkop 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 pul;pi6h.)slji we tpn26tzp)-o led by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of thepzh; w6 )snlpojie- 6).2it pt object?

  A horizontal force of 5.0 N accelerates a 4.0-kgircz) w3n *li4 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 puclu *jrnfr 2k,,ptc-( nk is given an initial speed of 10 m/s. It slides 50 m on the ice before it st(-,clr*tfk2jru , nnpops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic acci*0.dcuxcpnxt; -wnrlu:jhsfe c/d 6 cdu10:)dent, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be cf-pt xnl 0c d6u;/ cs0e.*jxu:hrdc: uw1 )nd0.500 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. 4-6.) The surface betohzqctp( iqxv;y(dq :r5(0-kc4m 0xxween 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 friction qx5x (xz q0r4; pv ((-tqymkioc0h cd:force on the less massive box?

  Two boxes of masses m and 3m are stacked. 6257m(g(d2fsvbh 3kotlcud o(See Fig. 4-6.) The surface 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 coefficient of static friction between tho23(f( d6tgcv5dslb7oh u2 kme boxes?

  An object is on a frictionless inclined plane. The plane i16rvko- :moo -sew.h ds inclined at an angle of em ook:v1hs o.6rdw--$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anglvp (iliwv0 ()ne 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 o k;160sl,8flwctz kkd f $37^{\circ}$ 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 ,ik4cdjxf gm1 l )oi i7044rb:7evfiotilted 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 direca8n):.7wd ykua syy3* ujpay3 tly down an inclined plane, at a constant velocity of 6ayn. py us3 yk)dyj3u*wa7 :8a.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 srcn:v 0x;cz79n ;je udz41sac lides 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 slknd5ktdu0 5p6ides 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 surface. -gu/p-3-0 pgif kz zpw The cable attached to the log g/ip -k3z0wpgu zf- -pmakes 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 rou2ku7yo )7-oxiz eiif:gh inclined plane tilted at an angle- )z yfux7o k7o2ei:ii 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 inclinedkbzp24pw: l t0ri tv/2 plane. The angle of incline is gradually increased until the pbzt0ri:wk 2vl4p/2 tobject begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?