Which of Newton's laws best explains why motorists should b j(evi-fsa5u,rlywh n6ob3s g13zg ;;uckle-up?

  When you sit on a chair, the vgsdjw1 7y7 *)7ex c*dtmbne5resultant force on you is

  In the absence of an external force, a moving mlceioee+dr)b , q.4)object will

  When the rocket engines on the starship NO-PAI 5,dile5uqj;sN-NO-GAIN are suddenly turned off, while traveling in empty space,,el5;qdu i j5s the starship will

  A rocket moves through empty space in a straight line with i9)d6ryn30slky+j ipa. f 6zuconstant speed. It is far from the gravitationaln)aspljird9 k3 yf6.+yu 6z i0 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, and you x01 jtoflr ui19u+vhv8+ pd)t suddenly fall forward. You can imply from this that 0uf1utpo td)xj+ vl98vh1i r+ the bus's

  You are standing in a moving bus, facing forward, and you suddovpbhzvbe38; *+4ry u 2ykyi 2enly fall forward as the bus comes to an immediate stop. What force caused you to fall f8ev*+ ybb2 3k u2zivoyr;h4pyorward?

  A constant net force acts on an object. e(p 6)sa sacx(Describe the motion of the object.

  The acceleration of an object is inversely proportional tu;rvv 0*tv.hm8sb .jxo

  A net force F accelerates a mass m with an acceleration a. *z5dx*xtx v007 mf rljIf the same net force is applied to x5x*7f0r*m lvt0 z xdjmass 2m, then the acceleration will be

  A net force F acts on a /u6 q:d r u9t6zai1b-b rf7t7fja am;wmass m and produces an acceleration a. What acceleration results iti7azr9wmft;1b 6fu b -aj67ua:rd /q f a net force 2F acts on mass 4m?

  If you blow up a balloon, and then rel446+i0qqgzakvv * nxehp .ef2 mj6*imease it, the balloon will fly away. This is z pviee+264q6gnvm*axq04ikm*h. f jan illustration of

  Two cars collide head-on. At every moment during the collision, the magnitudr kyq0qo6d-r 5b d48moe of the force the first car exerts on the second is exactly equal to the magnitude of the force the bo5r -04m dy6k8dorqq second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which thehd iyh5 ozylorq 166+*fqs7evv 2 :7tr object exerts on you wile siyh7r756rh6 do1v2 l+q yqt*f zv:ol

  Action-reaction forcespku5p8vi9etnw zie;k j/y:k-a ty vo3sx8. (2

  Action-reaction forces a ;ry,-e w*ozvcre

  A 20-ton truck collides with a 1500-lb car and caqeo.hipo;2-h 98 yaomuses a lot of damage to the car. Since a lot of -8 o y m2ahi9.;qhoeopdamage is done on the car

  An object of mass m sits on a flat table. The Earth pulls k;88huv9l0jw g:obapis sq 11nrye :2on this object with force mg, which we will call tg h:r8vk:e9ys1j o1n sw0 a2;lubp qi8he action force. What is the reaction force?

  A child's toy is suspended from the ceiling by mean ft1m;srs6j;k; vruh8s of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action fhfr j1rsvm; 6u;ts k8;orce," what is the "reaction force"?

  Your bat hits the balln h6lc g a*;hkk7lc;ua-l81wp pitched to you with a 1500-N instantaneous force. The ball hits the bat with an in;6pcwg nul 1k- *a8lah;7khc lstantaneous force, whose magnitude is

State Newton's three l ( vibt2hrqu(/exg(d3s*:fq yaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon tw:oa 2xxf fjlm2k+jt(h5l4 +u han on Earth. Which of the folloxa 5kt4x: u+omwf jf+jl h2l(2wing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which a yncv67bc57q2/9tct npcm-h vcts at a distance is

  Who has a greater weight to mass ratio, a person weighing 4 d zo4v80nld4n00 N or a person weighing d4d nv80znl o4600 N?

  A stone is thrown straight up. At the top of its path, the net force acting on -dx) 5 9j efg(hecz*lwije ce(-h*d5lfw)z 9xg t is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from t+xkkln (8k7xwvms .v3he same height. Ignorv3 .8+ kmxl(kw7 ksvnxe air resistance. Compare their accelerations.

  A brick and a feather fall to the en0p7 p+5xk3nrr mc.n marth at their respective terminal velocities. Which object experiences the greater force of air x. p 03mrn prnc5m7nk+friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Tn db/d q6c(k:bhe elevator is movcdbqn :(6 b/dking up at constant speed. What is the tension in the string?

  An object of mass m i3l kv 0xi9d1mos hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string? dxli9mv0ok3 1

  The force that keeps you from sliding on an icy xqxmis/c65;) b 5k sawsidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep4z6r lvk6pd(;kt8myx pushing it with constant velkv4yx p68z(mt;rldk6ocity, because

  A horizontal force accelerates a box from rest across a horizontal surfac 7hvq zw3g02bae (friction is presg7zv2q3ah wb0ent) 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 iacr ,yg6h8 6hz+qg o6.kdck v5nclined ramp at constant velocity. Thus we can deduce tha6qdcc+5 hgk8rvg ah.o y6z,6 kt

  A block of mass M slides down a frictionless pla f/vkyj am339:crx0 e0 nc w,xxtf.xu.ne inclined at an angle q with the horizontal. The norm :ecrwf9.c,mf3x nxx0au/3.0x vtjykal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an /y x8v8zotz )me.szk2angle q with the horizontal. The normal reaction force exerted by the plane on the block ist 8zx.ze8s2ym v )/zok directed

  A block of mass M slides down a frictionless plane inclined at an angle q w0o o ye8iwfa 4,4 fb. b9;ec+pjk6iibcith the hor4 j; e8 p,ceoffib+b96k ob0ciayw i4.izontal. The gravitational force is directed

  Two toy cars (16 kg an,oou-8lk qri*d 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes t- *lo8,qk oruiheir acceleration after being released.

  An object sits on a 3)h 4 vik+z azv 5ha(p:r9uyfdfrictionless surface. A 16-N force is applied to the object, and it acceleratu(vz: 9hhv5+zkf 3 aipa4d)y res at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acceler2c6*- lg-a:k mnzwqad/v 5lezate from rest to 27 m/s in 7.0 s. What is the average forward force on the car zc 6m z/all*vk-na5dw2q-ge:?

  Starting from rest, a 4.0e( 3b.iwl w 4 cl2.yo ;hut.icycx7mi*-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force actin.ehbytw( 3 yw.. 4 i;ixolm7ic*cc2lug on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of noz p4w7k di(y2k*hl 41xf 921mpnphn50.0 m/s after travel4d2i hh yx21 lpmopn k n4f9zwp(*n7k1ing
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 sampowf9c5 h:whz o250 dxe force that you push a 10-kg mass from resth 5c:owzpw590 o2 dxhf,

  What is the mass of a b-15,nuh.qeu u 20rul gxsp)v person who weighs 110 lb?

  What is the mass of an object tp+sw ; gj:wpsv s;a-/78ukjddhat weighs 250 N on the surface of the Earth where the acceleration d8w d; ;7sk+-dpujwsgjsp v a/:ue to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What ibd,cfsis).g+1yh 4+z jews8 ws the mass of the object on the surface of the Moon where the accele ce.,f1 swgds4jw+hy sz)b+i8ration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weigh j+3u4uyoi;* dzhoe a,s 40 N on the Moon. The Moon's gravity is one sixt 3 4,uy* uj;ehzdio+oah of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-wa 0rmzm 0kh/ r ygbsr 56)m4ifimp+b5s+r by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelem/)b560f+0imrsks gzyp b+h m rm45i rrates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a8r4y 62nr n.s kadrmil u.y70j level frictionless surface. A force F acts on the s4j. ad8 2yrr6knrnms 7 y.liu0tack, and 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 hed e+ y/:e.,y skmje 0w)*avlscale be reading when the elevator is accelerating downward at s)e*k+hme.e w :v0 lejay,d/y$4.00 \; m/s^2$?

  A person on a scale rides in an y tc z0rs2q483t5awhrelevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accc08rr4t3h 2 st5 zqywaeleration 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 6u9;6j ffya ud/k23np t+4v6*fduvw uo0.0 kg and the elevator acceleratef2upv +64*ujt; 3 auw6 fo9dunkvfy/ds 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 magnitude of 8.0 ud wx4u: c ix90w;da.5hjynp4N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the u9ad4wxw.d54y xphj;i0u: cnmass?

  An object of mass 6000 kg rests on the flatbed of a toe6 8/zffk p68fz6 q.pdoniqulc 2::lruck. It is held in place by metal brackets that can exert a maofpi :ck6 o qd:6q8zlffz.nu l2p8/e6ximum 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 o0l)b,c:6o 1g pgd u x0rkk)bpdf 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 the minimum stopping time if the load is not to slide forward into the cudbpp6x)0 d) bg0l,o kc1:r gkab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what qiet 8o puzx aj:q,*;un)/c l3is the magnitude of the acceleratioioeq* qaljcpu/)x3uz; 8,nt:n of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Figbb /hi b3 wq-:geydt)8. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? dg t8ye 3:/ hbiw-q)bb(Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force x ;,*f1i bpog0hubs d3of 100 N in a direction fbg h;ipdo,3s0uxb1* 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 horizon zo :/cm)zf8.u-gr nrs2b ;bcvtal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the nbzvg usbfc/ .zc:o;) 2rr-m8box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight .bhzeqe;dv)6 t6f1cbyt6 -ao100 N is supported by two ropes as shown in Fig. 4-2. What are the tensi f)v h6a oeq1ecz;b.t6y-tb6d ons in the ropes?

  In Fig. 4-2, if the tensions in the rope*b (ten*wu;sclhutk1 u26u(k s are 50 N, what is the mass of the traffic lig tet1lhu6* ck(2nu(uwsb;u k *ht?

  Two boxes of masses m and 2m are in contact with each other on a frictionless ti w2l(z9d87ogjtg:e surface. (See Fig. 4-3.) What is the acceleration of thez2g gd e:j otwt87(i9l more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictfxi x57yd:yz9e5 ynqz-r,ve(ru9z r 4ionless surface. (See Fig. 4-3.) What7zy( y5zrq x,ur5i4f:-vynx 9d9ze er is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig ;64 5axw;fsnax+ icvc. 4-4.) If the forward force on the more massive box is F, what is the tension iswav x5xaf cic6n;+;4n the connecting rope?

  Two boxes of masses m and 2m are connected by a rope.2t9a 9t) pk i+luhz0 pbt50bme (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelerapb2 iem+uz)9l t95hkp 00btat tion of the less massive box?

Two boxes are connected by a cord zc 6m,/7 *hd+98.zxoo7z lw lmfhpokd running over a pulley as shown in Fig. 4-5. Box I of maoom /zpz,.7 d7odc*hkwfh9+6 lzmxl8ss
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 frictio 3lqpan/g np9vpop ot6l5ihfsd6 :939ns between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is appli if:so3pvp95 l/pa t9qh66png3dl9 no ed to the box?

  The coefficients of static and kinetic 60l( +o5aoqekkt/ng;n ye0oq frictions for plastic on wood are 0.50 ano0 qno5e6kng q/ ek+0al;y ot(d 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.f( yz+7duyy6 vqr*bg 5 It slows and comes to a stop with a cz+(b *fyygqr76vd5y uonstant 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 by a 5.0-N force. A 3.0oib)rzvj./l8.a4 ld f-N friction force retards the motion. What is the acla)8roj/i.4 dbz .vflceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a r/e b0-hbptm9csss*dxl)u b5 2ate 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 slides 5031jd m;vwn *ig m on the ice before it stops. What is the coefficieg3m diw1jv;*n nt of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 9ke4 )*pnf -xg jid ru;onhp-/)0.0 m long. They determine the coefficient of friction between the car'spf--) gnpj4xk oenu;ir/d)h * tires and the 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 r q-z.he z7fkdq9 r;e83m are stacked. (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 doesd9req8z;efkr.- h qz7 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.) Tb5zpd , d6*ve,ozgnku9e a f/4he 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 z4,e*a 95b6 nzdgkvdo, fpe/uthe coefficient of static friction between the boxes?

  An object is on a frictionless inclin7 *0c3*gtcz tdor ik(ued plane. The plane is inclined at an anglet ok0rc3*( 7gcd i*utz of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an nbzzoj//rx 6f 7(po(xangle 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 rkk0p uqw6 9wze gwo0 k;;o,d;,jzpq7with 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 smoo.nb24)l gb k vch4q2deth inclined 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 directly down an incl;fwy)9l3b). rxx *mol8yuo 8i/ a ihszawi7k ,ined plane, at a constant velocity of 6.0 m/s.us waf b8i z,.yx lyk*8ilri)39; hx)wo7a/ om
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 : pql+bj +tww+t3 ex,sdown 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-tlqwd9 f(w l)*pi g4r 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 5fq rnvacyy6kq /l7q(gvwe tz2+1*9balong a rough surface. The cable attached to the log mak9/ z(q 2ybq*n+15wkavyc qvlrefg 6 t7es 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 aq,z1,ids(v wt rough inclined plane tilted at an angle z,w1i(vsqt,d 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 pla*.yujf5 -ycgfne. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs .*j5f-c ufyygis q. What is the coefficient of static friction between the object and the plane?