Which of Newton's laws best ex: pziq t)2vewm5l29h cplains why motorists should buckle-up?

  When you sit on a chair, the respalt8qm7hpuft,6d ,+ ultant force on you is

  In the absence of an:y39z vtxy xu( external force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turneb e. 9mmhiipi, 5xe3v;d off, while traveling in empty space, the starship wilee hiiv.mbx5 9, p;3iml

  A rocket moves through empty space in a straight line wi -j4zornbi65a-f;og+vgr8 p q0s+magth constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in op+sga8f6nmqgva 0 4+ozj o5-;-bgrri rder to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenlb;c e q,art *1y(7hoeay fall forward. You can imply from this that otyr*cabq1 eh7;ea(, the bus's

  You are standing in a moving bus, facing forward, and you suddenly zr ugn;x8f+ 0afall forward as the bus comes to an immediate stop. Wh;z+n0gaf ru8 xat force caused you to fall forward?

  A constant net force acts js j1ehh uuiai. r3bq;te,*38, l+yn ron an object. Describe the motion of the object.

  The acceleration of an object is inv52st f yu)0krjersely proportional to

  A net force F accelerates a mass m +l; ogec, kr: ma-ly/swith an acceleration a. If the same net force is applied to mass 2m, then the accelel l;mo -+/e,kry:sacgration will be

  A net force F acts on a mass m and produces an acceleration a. cet,rc50if,xgyvb* * What acceleration results if a net force 2F acts on mass 45g,e , i crvxy*f*0bctm?

  If you blow up a balloon, and then release it, the c rq.r1j9mkmj2ib 4w 8balloon will fly away. This is an illustra9. 8rijwr4jqk12mbm c tion of

  Two cars collide head-on. At every mome0q.3+ hs1eu hwh fsbt6nt during the 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 examplew13 u6h.hetfqss+0b h of

  If you exert a force F on an object, the force which mnsamz ( zf(2)sk v9p;g)pw 4dthe object exerts on you wilmsw2azs(md);pk (49vgn p ) zfl

  Action-reaction forcey:ce z8h:qh/nwco do -p).zq) s

  Action-reaction forces ac3(26f- ikhle x)bw k,hk-f cj72zvajre

  A 20-ton truck collides with a 1500-lb car and causes a lot of damag4/qyjx5auu-vccu6q0 .h s -c je to the car. Since a lot o06c a 5uq -xcs.ujy/-h quvjc4f damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objecf1*ey do: y/epdp/)kiomx- 6ct with force mg, which we will call the action force.)e eyo xpfdmyo6k* /pid/1c- : What is the reaction force?

  A child's toy is suspended (wi;yw -+ia mgqp: qbvadkfr2j nv+9/;gk 4; efrom 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 "aqajk/bvi k +:;(i4- qryvg+p aenm2d;9g;w wfction force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ba;(z en98h72puzp3l ye 7o bxmem1ddd( ll hits the bat with an instantaneous force, whose magn7y dxedhelzdo(2mu8( znmepb9;13p 7itude is

State Newton's three laws.59 7m ahth,k0mhkmt 3c

  Mass and weight

  The acceleration due to gravity is lower on th c3xbq* i;n(;ix.pxbfe Moon than on Earth. Which of the following isxiqx*b.c ;(pbn f;ix3 true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts atli0.chl1wa q:5i 6 0yrxcn1ld a distance is

  Who has a greater weight to mass ratio, a person:q y2g g /r.potbxrmwz2 38kp9 weighing 400 N or a person weighing 600 N.y: rxb8 wzpm3r29/gqo2tkgp?

  A stone is thrown straig: tl v)c v/5 qlruco1qlr36wm2ht up. At the top of its path, the net force acting on i2m5ltov:c/6q llqr1r 3v)uwct is

  A 20-N weight and a 5.0-N weight are dropped sip , d e;j(a-hturvr7k7multaneously from the same height. Ignore air resistance. Compr7,(a- hurvk7pdj; teare their accelerations.

  A brick and a feather fall to the earth at their respz (,zjun7ma6vt)nr hz2 ejvs11iub(;ective terminal velocities. Which object experiennb 1)atnj(hrzu zz;1 mvu i726(jvs,eces the greater force of air friction?

  An object of mass m is hchcm2)l/h xf7 anging by a string from the ceiling of an elevator. The elevator is moving up at consta2hxcfh/m)lc7 nt speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevat3,ns 9nhu6ah prh1vc4or. The elevator is movin6h3npvhn 1su94c, rhag upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an ij f 9qxgam q:s51gc,rn8pr/b drt+1q7cy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keepzx2vde+m7f 3dy. yl 5m pushing it with constant velocity2 zd3dlf+m .7yvem5xy, because

  A horizontal force accelerates a box from rest hge+ ju ;p6d1xk3tfs ,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 force is doubh;kf1dg x6 3uspt,j+eled. What happens to the box's acceleration?

  A packing crate slides down an inuy8hy*l 3i r kja6maed.v *n:vzes;0/clined ramp at constant velocity. Thus we can deducevi3vlya *:a k e/duejn6yh.m;0 srz*8 that

  A block of mass M sli 0ljq :yw )-bjt+end5cdes down a frictionless plane inclined at an angle q with the horizontal. The normal rlwbd)te 0y jqjc:n 5+-eaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with pg kw vy wroi;o:u06gie5zx pss)0):- the horizontal. The normal reaction force exerted by the plane onok0 i0g6ryv-e s sziw p:5wp;))xg: uo the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q v*qlwiw4+u0;c)m qm-h lisz ;with the horizontal. The gravitational for )0vwqs-iuiqz ;; *cm+wlh lm4ce is directed

  Two toy cars (16 kg and 2.0 kg) are reley*rss7bx 1cjb*g;j9m ased simultaneously on an inclined plane that makes an y1*s79 xrjjgc;bmb*s angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. cdrbc1hg+0 h2 A 16-N force is applied to the object, and it accelerates c1gr 2 ch0bh+dat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accedn*qr9o vg2d0 lerate from rest to 27 m/s in 7.0 s. What is the average forward g 09dv* qo2rndforce on the car?

  Starting from rest, a 4.0-kg body reat4ol(y6j u 15)zcxcbzpytaw h*qf:3-ches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bxu(b tj)-fc1yo*q3cy z4p :t6za h5 lwody?

  An antitank weapon fires a 3.00-kg rocket which acquires a f-rtv9- 2c.xw.kgufjspeed of 50.0 m/s after tk9gf-. t- ruwvj2.c fxraveling
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 massvqbfot 7z+ld. h*85pn with the same force that you push a 10-kg mass from rest8f n p+t5vbohldqz.7*,

  What is the mass of a person who weighs 110q3 99g: rqtu (ws53hqwo j(lxq lb?

  What is the mass of an object that weighs 250 N on the surface of the Earvqk/; fu l. scp2-bn8lth wherebvlsu n .p2l;8f-ck /q the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of0af dn0l*n mf; 60 kg on the Earth. What is the mass of the object on the surface of the;mn0af 0* lfdn 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 weighs 40 N on yk0usbr*lr2z2*r dewu11b ) d the Moon. The Moon's gravity is one sixth ofbld*zrrr0 b*2w)k1su1 yud2e Earth's. Compare the masses of the objects.

  Sue and Sean are havuz. 4 y19rd1dnofwt4bing a tug-of-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 ac ontz ur41fd1 9bwd4.ycelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a bs1x.f9sv ge/s g 0i4elevel frictionless surface. A force F acts on the stack,sf0v.e14e g is/ gsx9b 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 dx xkq;7 w/jklq;k+xi wci8qs1sg393scale be reading whe9diqkqs 37;w+x1j/ksxi gq8wc;xkl 3n the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an v)n(ykyn5ts 9 m6 bxi:elevator. If the mass of the person is 60.0 kg and the elevator accelerates downwardmxy ):(n9b 5knytvsi6 with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridesf0yp0npi m 6j2w ip74s in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward4nmi76yppwj 2s00p if 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 a6 eqi )6s(/h)frv jira magnitude of 8.0 N and is directed due north. The rfe qsj()6 6 )/iiravhsecond 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 iab3nvj md dg od:r+y.93jrs,3vo +v3 dn place by metal brackets that can exert a maximum horizontal force of 9000v3rb9ngo:m raoyd.djvd,v3s +d +3 3j 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 of ;eyvkjep.8v8e 0/f+yntekir - 13xji a truck. It is held in place by metal brackets that can exert a maximum horizontar8/efeyyp8 ek 1j;v0i+ xj3.etk-vinl 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 = 0.60 kg anxcoxh,* -l(xbkpoejy /t7 j 60d m = 0.40 kg, what is the magnitude of the accelerationx- j6yk0jxlx7e b (o/pcho ,*t of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shbp*2i7 ujzq.i p*. o,vcqcnt 9own in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in thq* ,9ticb2v*qou cipj.7pn.z e string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of boo-vo9ystu x6 2xq,* m+ssgw: roks on a smooth horizontal floor with a force of 100 N svs,mow2sg x-q9 ty rxo6u+:*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 bookq;h pt)asz-i; s 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?p;zhi a;s )-tq

  A traffic light of weight 100 N is supported by two ropes as p:ug*kq(q,-lfwwq4cshown in Fig. 4-2. What are the tensions in ucq :,-wql4kwpfgq* (the ropes?

  In Fig. 4-2, if the tenag2 .hdipa :;zsions in the ropes are 50 N, what is the mass of the traffic light;:a pi.ga d2hz?

  Two boxes of masses m and 2m are in:fg5ys.fsokvg:4u,j.g q2dhr :e j/y contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massiveyg5dk:: :vsh4uegj. ,r2/og q fs.yjf box?

  Two boxes of masses m and 2m are in contact witrju wx6vno s3w)a)8-b-b t eu8h each other on a frictionless surface. (See Fig. 4-3.) What is the net forcn-eou)sujwb t-3 a8x wrv86)be on the more massive box?

  Two boxes of masses m and 0 1kc a wnd(qhq.:(dlb2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is Fnchk 1 l0ad((qqwd:b., what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.vk582bbqb z:n ,o+dyo ) If the forward force on the more massive box 2odq+8:nvbbobyz5 k, is F, what is the acceleration of the less massive box?

Two boxes are connected bg m-4ti3it.x 4y58lje+ kfc gry a cord running over a pulley as shown in Fig. 4-5. Box I of 5xc44.yj gfi8g+re3 ttkli-mmass
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 box and a d7nlx59k,bo owh e1zs1,-it dzot-x w -esk aew9,5x,ozh-lx1 kdzsw tb 1o7-in- t ore 0.40 and 0.30, 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 kis813nfto tzm - mzmtpuk 8,q5/netic frictions for plastic on wood are 0.50 an-t t 5zmn,op/ztk1f8qs8 mum3 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.x10 nvlk-6 v;j mpk.ng It slows and comes to a stop with a constant acceleratinnvpxl- mkgv.60;kj1 on 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 5.0l7v qr6ffox)9hue( xhq9pc)5 -N force. A 3.0-N friction force retards the motion. What is the accelerati)eu7 x69c5fx ( hrql9v)hfpqoon of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a ra 0iz, zvsppwh,o62q9lte 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 speeds /+sz ndn8ex2 of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic frictie/ 82s+zs nnxdon between the puck and the ice?

  During the investigation of a traffic acci8 3le 5bys7iqndent, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the cars3i8 7 ln5yqeb when the brakes were applied.

  Two boxes of masses m and 3m are st/vzln gki1h gyo62s+* c;y gt+acked. (See Fig. 4-6.) The surface between the more massive box and the horizoy os+k*zich lt16 ;g+vyngg2/ntal 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 m4;* * lxvkgpam and 3m 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 does not slide on the more massive box, what is the coefficient gm * ;xv*a4lkpof static friction between the boxes?

  An object is on a frictio0a.fkj iauvtga1/q)v66i 7c e mc.b:hnless inclined plane. The plane is inclined at an angle of a71/ :cikfhvj.b e )6 uaivtmaqc6.g0$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dl6 lcdp:(bljirea, .8own a flat 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 smoothm3ntfo q +7x5t 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 plane ti- b+d0 za6q bl1xeg-vblted 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 cons*k6*owjf0e5aij h jp rn((:autant velocity ofnj(6o ra: j0hp i(**fekau w5j 6.0 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 slides dow 0g+vgxe xxet9psd*;r;yxh3:n 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 roe9;4 esahx0nj2i-mmxa 6rl *augh $37^{\circ}$ 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 t km6 xt6lk1q-weighing 500 N along a rough surface. The cable attached to the x6mt1k-6l qt klog 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 inclined plane tiltedkmwh: 4h;sg0p at an anglem;:hgksh4pw 0 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 plane. The angle of incline iad62i7f 4p vpus gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coeffic 72ppd6v4 aifuient of static friction between the object and the plane?