Which of Newton's laws best explains why motorists should vlyhh33snx9p+ *n / d :ut7cnkbuckle-up?

  When you sit on a chair, the res0l(ye0fyg6 ok+p5zm2u x4 7sgh1c brvultant force on you is

  In the absence of an external force, a movin n:nu+xw (m9.fbmy bsej. +/izg object will

  When the rocket engines on the starshi/r ik64mu dva5p NO-PAIN-NO-GAIN are suddenly turned off, while traveling ina/m 56kud ir4v empty space, the starship will

  A rocket moves through empty space in a straight line wd) zs l ,r k),ctcm5sm+wvqh: +b)pn22dxyct1ith constant speed. It is far from the gravitact qddy)wn52cckt2vm,: zrb+l)ss+ p ,m)h1xtional 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 suddenly fall pcczwsu w *n. (5vj3rws1ds:4 forward. You can imply from this that d rw v(csw5cs. j13p*uwzns:4the bus's

  You are standing in a movingd; s n7f8)py w l5mgk.zpnemn,wc 9z4( bus, facing forward, and you suddenly fall forward any7ww mz8nd49nks lp.zgc5,(f ); pm es the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motiolk4f5i,p)y jot q*ppbj/m0k 0n of the object.

  The acceleration of n zrv40amitwbn7z181an object is inversely proportional to

  A net force F accelerates a mass m with an accelermc d /36nprj*bation a. If the same net force is ap*/n 63jbdrpcm plied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Whapje t*pcuhos-3ob:* d- gixf,5:nfl )t acceleration results if a net force 2F acts oipxhf)3j*ctp ::-lgn5o oe , subd*f-n mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly a g+px;i3cz7rmm y+8bmway. This is an ilzmx+c37+i gpym;rb m8 lustration of

  Two cars collide head-on.s-)+an uirt.kvrs(a, At every moment during the collision, the magnitude of the force the vtnsr ak.( ra-,i u+s)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 example of

  If you exert a force F ds 9kai7+ 1yjjna.m*ay)c wv40yj ss:on an object, the force which the object exerts on you willjiw4 0)as1dv9yya*n: .m sy7ajs+c kj

  Action-reaction forcegggw2*m 4+ y8pkix ay3s

  Action-reaction forcqtvtbd( n.j+,kk( az-es are

  A 20-ton truck collides w 2ob 1ann.hop5ith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage. o1obpann 5h2 is done on the car

  An object of mass m sits on a f ft eet i+.bminb;;*2m s x*.o+0kvgzelat table. The Earth pulls on this object with force mg, which we will call the ;i f*kgx z*eomi2bt+n+.m; seb .te0vaction force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of xqy86f4+,zejm:k1s dp.f:) cjs kkfla string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "acf:)e:f8cfk.sjx d zs+m6ky q4k,pj l1tion force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The badkwyh*w,- jp xi ozhy);pn3 wy 5:(ps,ll hits the bat with an instantaneous force, whose magnitude dw;on,wh*-p , ixy yphp) y5kj(s3z:wis

State Newton's three lawsq7.9dc4j* ugdqwks/m*e )o6 e gh tak/.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.+6 qfpc:q.onn Which of the following is true about the mass and weight of an astronaut on the Moon's surface, comno+qn fc6:. qppared to Earth?

  An example of a force wre9c7h9:jo:.ha*yw b t rb9gjhich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N orjc8 (f5( -npirqyjer7 a person weighing 600 N?j e8q5j(i-fny(7r pcr

  A stone is thrown strartgi-*kx2lv6 om2a(2jgd3k w ight up. At the top of its path, the net force acting on iktoj2(wadglkx* g2imr-3 2 6vt is

  A 20-N weight and a 5.0-N weight are dropped simultaneo sh ly(xea q/ i+f59sg(s9sny9usly from the same height. Ignore air resistanc(xgsis y aes/9ysf hnl9+(9 5qe. Compare their accelerations.

  A brick and a feather fall to the earth atkkdy1jl4h0j n t io9,ozx3() k their respective terminal velocities. Which object experiences the greater force k tl9 inz3x4do(k,yjhoj0 1k )of air friction?

  An object of mass m is hanging by a string from thiy7e:yp 2nte 3e ceiling of an elevator. The elevator is moving up at constant speed. Wy e2 ept7n3yi:hat is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. Th upyvev erla76l /h-5-e elevator is movinvpa/ry6he -l5u-l ev 7g upward, but slowing down. What is the tension in the string?

  The force that keeps yd;v:7 pc ;f26a3 hnjpcvlfhi (ou from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy i ljq(a,y,+6ozxvx0 i/*jsxz carton from rest than it is to keep pushingivq6s,zo yx(,jx j i*lx+a/0z it with constant velocity, because

  A horizontal force accelerates a bos( n.e.cnml) ox 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 for ( .)me.nconslce is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at 4mjd;bl :t5 jzg.ev.oconstant velocity. Thus we can dede.tbd zg;ov4m5j l: j.uce that

  A block of mass M slifknn/y 1gl:u g)7n3jj1 0esqmdes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction fo/qngk0jy3: um1fn1 ln 7js ge)rce exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle hjo lk2e;qnoviimo7 3;1)5f v q with the horizontal. The normal reaction force exerted by the plane on the block is djim2 ov ifl 3o5 7;o1hqn)k;evirected

  A block of mass M slides down a frictionless plane inclined at an anc4r6ort5r z) ggle q with the horizontal. The gravitat 4rro)gr65c ztional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incglji*m )j oe;mbp0,gmif4z/(hyu-5 r lined plane that makes an angle of 30e with the horizontal. Make azh;,ijij e5fr)u yg-l* mbgp /0mo(m4 statement which best describes their acceleration after being released.

  An object sits on a frictionless pn2 k1do)t6zqsurface. A 16-N force is applied to the objectqpk6o)d1tn 2z , and 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 27 m/s in 7.0 s. Wly 3mu 5cl3f-,etgm 6jhat is the average forward force on th jc56ymel 3l -ut,fmg3e car?

  Starting from rest, a 4.0-kg body reach v* .ukl3dxak, nhq*:bes a speed of 8.0 m/s in 2.0 s. What is the ne:bnvq,h*ul3.a *kx dk t force acting on the body?

  An antitank weapon fires a 3.00-kg x)hk:oz d/u: erocket which acquires a speed of 50.0 m/s after: z)xkdou:eh/ traveling
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-kgjy-.ph og(9q k mass with the same force that you push a 10-kg mass from rest p.okj (hg-9qy,

  What is the mass of a person m./.narm3 (ei/x f omcwho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the8-wqdk(+ qnl g Earth where the acceleration due to gk +dwq -nl8(qgravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on t6*xm(riv yfid k+4da56 m6 gsfhe surface of the Moon where the acceleration due to gravi6+a*y5f6 6x fvrmd(s g4mik dity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon neu,(( utr,cm. The Moon's gravity is one sixth of Earth'sun(re tum ,(,c. Compare the masses of the objects.

  Sue and Sean are having a tug-os+). vic nfc;-/iq naff-war 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 accelerates tf / -n.cqfiac v;)nis+oward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A forcx+m .*85f vww mzt5nfce F acts on the stack, and it accelera5cf5 v*x8w f wznmt+.mtes 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 48wyq0+bs9 ;f(qph 54kqijspw 10 N stands on a scale in an elevator. What will the scale be reading when the + 9w q(;qq5fjbp s1h p4yi0kswelevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass ofx-mdtot12k1bti; i .u the person is 60.0 kg and the elevator acceleratesi t b.xmt1du k-1i;to2 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 thv b ij;4-(3hcogd ut,vs;(bhoe mass of the person is 60.0 kg and the el bvod(tuc3hbsi; ;hj(4v,- ogevator 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. Osf6uk11p-ft2nyqh ( jne force has a magnitude of 8.0 N and is directed due north. Thq- (kuh1s2npf fyj 16te second 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 a truck. It is held in82/d,aif* bpbn :efb n 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 to slide forward into nbap:8fe *,2if /ndbbthe cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held inp8tzolahz -b p.k.60 w place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is trav6. tkz.la 0b8 -wphzopeling 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 = 0.60 kg and m = 0.40 kg, what itn n3lwe h)2s;s the magnituen n3;l )wsth2de 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 mo7e 4re;)rzgand m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of ezm r;g 7o)e4rthe pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force olv* 0i + h++7eesbbak mdp*:;b5zea azf 100 N in *eebzzd*5k;a+ sl+ap7+b:vmihb0a ea 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 8d; ph-kixu a+on a smooth horizontal floor 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 is the normal force on the box ;kpd-ihuax+ 8?

  A traffic light of weight 100 N is supporte5l ;.smp p;dbz1i u8bgd by two ropes as shown in Fig. 4-2. What are the tensions ;.b5 8s1 d;ilmg pzbpuin the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is naye e+c .x28athe mass of the traffic ligh. yx+8aenc2e at?

  Two boxes of masses m and 2m are in contact wiobypen k27pi q2n:n- 0 k,-zuqth each other on a frictionless surface. (See Fig. 4-n0niqpqkz nkyb o7 -2p,ue:-23.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other onk -2fz6 eku 6e;,fyxan a frictionless surface. (See Fykkau;e 6,n2f f ze6x-ig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4a3jy ( fdd7,0bqt9v.m jgl:aq.) If the forward force on thjf7v. ,:dbq 0ad(g9qmyl3j tae more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m zl552lpet9qf u;:qa+ ol davxu5r1) xand 2m are connected by a rope. (See Fig. 4-4.) If the fleplaqa5 +);lu fxdouzv9:qxt15r 52orward force on the 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. 4-5. ku df9s7 ewp,of03y2 j:e4iycx 0lxc5 Bc fu3cye9lyxfwd7 2eop,i50j4s x:k0 ox 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 6 cwki,2hf )g+wsc ke8frictions 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 applied to the bgkcfws) 2h6w,+ick e8 ox?

  The coefficients of stat svtnv.6b bqmo9ye-4s0(r9 l qegr:3i ic and kinetic frictions for plastic on wood are 0.50 and 0.40:rsvsb(mqyve t-0ob6 .l9 qgir4 9n 3e,
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. Itzo; 6kba( kaa)kbn;i5* b e(bs slows and comes to a stop with a constant acceleration(ebbk( oz sanakb) a* 5kib6;; 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 -x*r b 8p:3dfbdoggy) surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the dgybf8-d *x)3gbp o :robject?

  A horizontal force of 5.l8s3d/ x4mr+xiphht fiui) 250 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 puckl mk+xvd): c/k is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck anm+c dxk vlk):/d the ice?

  During the investigation of a traffic accident, police find skid marks 90cc+qgoo:taek zf5 ft6 d gw5a,5t3-og1q n)b-.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing con5a o5-1t5 3a oft)cq+e z6d:goq f,gktgwnc-bditions. 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 dy 63f/ecan 8 lnh1 ge)fu)yaz- r.;rmsurface between the more massive box anne8aym- /r6 fcyah)3f .zge;u) l1drnd 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 surfm4rk4lkby dw8+6 lwo,ace between the more massive box and the horizontal surface is smooth and the lr,64+ ywwd4 k8kblomsurface 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 inc9)u8nndy.;u:2vl d4v )jlzbrpa 8zo blined at an angle 9dnzuzn)8pa b db.8)jv:orv4;y lu2lof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle ofwwum th88 -y kkmp)*w a8.. 5hexqs9zs $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on akuro; g*)*ypq94 rd8npqj u8s smooth inclined plane 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 pk9jjv8zotg) ks w -p5;tccq+0 lane 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 0by y d6c)j tq sx/fl*7 :) wgbqicxvt174fu:xdirectly down an inclined plane, at a constant velocity of 6.0 m/qq )7cs 4:yvb */g):idxf cutbyj6xtlw10 7 fxs.
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 slide+jf9vy 1n))avdhlg s nb ,y3)xs 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 c8*pzsh dowl)-6t(p l slides 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 roug3l k1b 3evk5wu3:qtuzh surface. The cable attached to the logklb q:kwu3 35zt 1vue3 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 incliu* 6tkz5r( jafhof0k 6ned plane tilted at an angle of kkha tzo(0*r 6fj5 u6f$33.5^{\circ}$ 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 angle of it 1gv3 -z,nqqsncline is gradually increased until the object begins to slide. The angle at which this occurs is q. What i- nq31g,sqzvts the coefficient of static friction between the object and the plane?