Which of Newton's laws best explains w4mam,t qtl m2lfy3 35jhy motorists should buckle-up?

  When you sit on a chair, the resussfr* pinyn r/)n9,5yltant force on you is

  In the absence of an external force, a movinl .ekm:t wms:ni(f t f5dn)p/+g object will

  When the rocket engines on the starship NO-PAq(56:xsaak xw4-ylh bnz g (4xIN-NO-GAIN are suddenly turned off, while traveling in empty space, 5akg6 -nq ayzbswx4x h:4((x lthe starship will

  A rocket moves through empty space in a straight line with constant speed. It +q .uoda/ir9lis far from the gravitational effect of u.qlod/ r i9+aany 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 forwardienxlr , :;fh/d/k4 jq *)wg4d kllv:r. You can imply from this that the b:d/id 4xvhgk e/) ,j ;lrk*nl4lqr:wfus's

  You are standing in a moving bus, facipyr6b 7uix9x (h qkb-4oel:5y ng forward, and you suddenly fall forward as the bus comes to an immediate stop.4 oy:pyul5ehqr67b -b9 ixk (x What force caused you to fall forward?

  A constant net force acts on an object. Descriom9juahegv ;e /ble 1gpbs6 i,803/ecbe the motion of the object.

  The acceleration of an object1 ncaaz:yfz)3 is inversely proportional to

  A net force F accelerates a mass m with an axa /mmb/))zz2 gof8 sscceleration a. If the same net force is applied to mass/z8/gs)x2mf)s amzb o 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleradj7 v:ds/ohep y t14(e1 nlke(tion a. What acceleration results if a vylk 1h oet:((/jd e1 4sd7nepnet force 2F acts on mass 4m?

  If you blow up a balloon, and then g2/4d m*qy. bhegx h,isdw 3n3release it, the balloon will fly away. This is an illustration3ged2d,/xm 3 y* sqwbi hgn4h. of

  Two cars collide head-on. At every momes51+sk:en 7w6fqp vdfnt during the collision, the magnitude of the force the first car exerts on the secon5pqnv71:s w s ff+6ekdd 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 on an object, the force which the objecbvv7c+ qa1;ba8 x5q ast exerts on you will8va s ab5q1+xc;vaq7 b

  Action-reaction force2gjat, .jmul5 s

  Action-reaction forceshl ,-; e9klf89 i awfv3g+myng are

  A 20-ton truck collides with a 1500-lb +g:w.p9)unr0s f3hf n to8auc9 abxw+ car and causes a lot of damage to the car. Since a lot of damage is done o f. raw8x9g+ut sc:pow)nbh0f +93aunn the car

  An object of mass m sits on a flat table. The Earth pulls on this objecg 4pcz)w.tmt3 vn;xw3 t with force mg, which we will call the action force. Whatmwz. 3ptgw34n) cvxt; is the reaction force?

  A child's toy is suspq fb6ne*9 8 g2e,oxalhended from 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 "rea28b69,*lox e gfh aneqction force"?

  Your bat hits the ball pitched to you with a 1500-N instano ny1sf,q8a+2 6 y(nm /ifczimu+d r3htaneous force. The ball hits the bat with an instantaneous force, whose magnitui q3/(8mu2 +y1rmifd,a cson6fhn yz+ de is

State Newton's three rv 0h4g9t8unilaws.

  Mass and weight

  The acceleration due to (du*e /vor gy(gravity is lower on the Moon than on Earth. Which of the following is true a(v*yd / ge(ourbout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force wh:d uukzp49s 4us5ip5jy e;h 3hich acts at a distance is

  Who has a greater weight to mass ratio, a person weighi*b*i ).lgbk /pwye/ eing 400 N or a person weighin/ ./)bwepgiyibke *l* g 600 N?

  A stone is thrown straight up. At the top of its path, the negg -ac1gwcw q6 r.p++ts5tp/gt force acting on p t6rg5 wswtag+cp-g/+g. cq1it is

  A 20-N weight and a 5.0-N 0nz e2ent gyh 2zr.*4fvdl*(dweight are dropped simultaneously from the same height. Ignore *2 *enrfld4tgh dy(n0 e.z2vzair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal ve+;;wrz ur+p+sjtqk -l, xe *iolocities. Which object experiences the greater forclwz;puoe i+sjk, xrq+; -+*r te of air friction?

  An object of mass m is hanging by a string frodki5 v bn*9.n/ p3ltdzcx- 5gom the ceiling of an elevator. The elevator is moving up at constant speed. What-n z .l5 dko*x icbnvg5dp/39t is the tension in the string?

  An object of mass m ily o51b ul xl1zt.9 2;q1hne t77famum4ep,gds hanging by a string from the ceiling of an elevator. The elevator is moving upward, but eot px1mdn12geh7t7l 41;lym z.5, lb9qufau slowing down. What is the tension in the string?

  The force that keeps you from suh h3k9 w6rl:bliding on an icy sidewalk is

  It's more difficult to stark)y)9ied/f k9tmo9dc*9e m l et moving a heavy carton from rest than it is to keep pushing it with constant velocity, becafkem d*)i9lt9) y9domck9e e/use

  A horizontal force accelerates a box from rest acros,n4ophvs,q + wavvfhyh3; , ;6pbn9krs 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 doubled. What happens to the bo6v;sy,ah ppr f;kov39,n ,h4qbv +hwnx's acceleration?

  A packing crate slides doh9rpu+g n/j+k/./ mm6oghfk j wn an inclined ramp at constant velocity. Thus we can deduce th9rfgh+h n.//6+ k j /gjmokmpuat

  A block of mass M slide/;hor tjj l* + 70uy8ejnvx:wds down a frictionless plane inclined at an angle q with the horizontal. The normal reaction f n lr*0:d;h+8uwetj7vxojjy / orce exerted by the plane on the block is

  A block of mass M slides down a 78e w4o2uth s(9v.dmrn.iqhd .py n9lfrictionless plane inclined at an angle q with the horizontal. The normal reaction forr v2.yq9hm.e4t. ln8d ihwnso 9d(up 7ce exerted by the plane on the block is directed

  A block of mass M slides down a friy1*xgzv6h // eso7o mdctionless plane inclined at an angle q with the horizontal. The graem /ghx1o s z/v7*yod6vitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on anil1kdz je2sq2u 9mg9e7h7 iet5r3/ wa inclined plane that makes an angle of 30e with the horizontal. Make a statement which best desu9771mrigk52 3tdj2l z eq/he9 swaiecribes their acceleration after being released.

  An object sits on a frictionless sur)d4( -**xjd upotpp zvdcgo66face. A 16-N force is applied to the object, and it aco p4*jp* dvzddtc6 ox)p(6u-gcelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can x3zw222dqpx u 0e 2 cas5fq*duaccelerate from rest to 27 m/s in 7.0 s. What is the av22 523xxf ua 0p2sd* zdwcqeuqerage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.f yq g0 oij7tedz lj2s*6/ );3x*jntfv0 m/s in 2.0 s. What is the net force acting on the body?0exiy js6)g;z dl7 o32/nvf t *jjqf*t

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50. ii56e9f7 i9kr3 mnvay0 m/s after trrf me95kiy7i9n36a viaveling
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 same force j0gy a-q,xd6nthat you push a 10-kg mass from rest -x6qg0ynjda, ,

  What is the mass of a person who weighs 110jk 6+4bnowl0u lb?

  What is the mass of an object that weighs 250 N on the surface of the Ear7vux/y)jm 2zlpey:(g ov 6 f8cth where the acceleration due to gravi)yup7cv8xygmo :j6(/ v2 zlfety 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 t 3+v9 * 20df+xijdkgyymhq/nshe surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Eartknqdj i * vsg2y3/yh90 d+mx+fh?

  Object A weighs 40 N on Earth, and object tv9ug jj1.9t1s2acrd B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the mj.12agtrjtv 99ds u c1asses of the objects.

  Sue and Sean are having a tu;)*zi 5ae pumt 7bana:*-oxg2p pc+dhg-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a c-zgm*una a:*2ep+dh;oa)p tb57ixp15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A kj(c0ux;p4nlc2ips .force F acts on the stack, and it accel;jl.k nppi4x20u c(scerates 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 stanm4 te:.:yzbifq,x od:ds on a scale in an elevator. What will the scale be reading when the elevator is accelerating dowmqzy:t e : i.:dfo,b4xnward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If hu dz2+ym0lpf )*r,v7amqf - b5m-idythe mass of the person is 60.0 kg and the elevator acpbyr7 *-m v duyf)ldz m +f52qm-0h,iacelerates 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 ofi(trk)er0 ywi8x 6np b-te4:c the person is 60.0 kg and the elevator accelerates upward rreeni4tcy- t pk0x i8)(:6wbwith 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 *m 5 km(g5/zg;l -reswa nrw,v8.0 N and is directed due north. The second force tow*w km-n ;l5mgvwr(5 ,resz/gaard 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 in yipm:6ahz1somw22lbr/;y 7:ggrh0 v place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is t rh2 /b20 gwmroy 6iagp:ysh17:l; mzvraveling 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 o6.t8lzp i2cmi- 5xf -bj xec7gn the 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 - cxbtex-if7c5ml.6 2ip z gj815 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. mkj(towzf *aifb /-x(bw 5-g,60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictimj5z*-t/ow-bfka(w ifb (, gx on and the mass of the pulley.)

  In the Atwood machinxxyj* gm9 , iym+alx.w73dl3oe shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Igxdlj+, xy7mm*33 aw.9 gixl yonore friction and the mass of the pulley.)

  A student pulls a box of y 63oy)959cvowqzqgwbooks on a smooth horizontal floor with a force of 100 N in a direction ofqy) 9oq9w zcg53v yo6w $37^{\circ}$ 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 wi 5wn u(-2iufknth a force of 100 N in a direction of 37.0e above the horizontal. If th2n 5ki unf-(uwe mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is smpboy*-f jzqlpp 3l5 1eke 9,+upported by two ropes as shown in Fig. 4-2. What are the tensionb3z1-llokepm*qp j, fye 95+ ps in the ropes?

  In Fig. 4-2, if the tensions in the rope;zjzu fz0twz yz 1gd;vip 5:,)s are 50 N, what is the mass of the traffic ld ,;t:viw 1yzpzgjz 5)u; zfz0ight?

  Two boxes of masses m and 2m are in comns2fai*jy8: smaq17ntact with each other on a frictionless surface. (See Fig. 4-3.) What is thms yn1q8asi:m * jf72ae acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each o6 *v o zqgph na43kbp448g33sh2hz kqpther on a frictionless surface. (See Fig. kz3qs4p64ogp32h ph 3n*bgq4 k8h zva4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) - ks/bagbdvn3v )-uw6 If the forward force on the more massive box is F, what is the tensio3 gd v--wu/ b6vnasbk)n in the connecting rope?

  Two boxes of masses m and 2ml5lpm d8h va/kar0e1; .wak1z are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is;5rdwk/k lm 0aha1ep v1l8za. F, what is the acceleration of the less massive box?

Two boxes are connected by a cord runn)ab(v rhds l2+ing over a pulley as shown in Fig. 4-5. Box Iad+ vbsh(2)lr 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 kine42mvmthi* c+ ntic frictions between a 3.0-kg box and a desk are 0.40 and 0.3+ nvhmt*4 cim20, 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 kinetic fr09ftt .w9vcgz 9dbizg3s3f6rictions for plastic on wood are 0.50 and 0.40,63brc9v. wsti9 zf9g3d0 tgzf
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 ;rfd0 yk8kfsj . tlwl3m d*zw.s5 /1yhdirection. It slows and comes to a stop with a constant acceleration of m5hy1z.yj.wkst*/d 03k ; fdfswl rl8-$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface i2s1 zj qupqw1,s pulled by a 5.0-N force. A 3.0-N frictionzqu11s2, j wpq force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.05hk(vh kv(6h1meyqqy ;7dk8 x-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 sicr0m7n cl8d6o9e *z9xbrwg + peed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficientz9*dn6r+ mcg xle io79w0bc8 r of kinetic friction between the puck and the ice?

  During the investigation of a traffic acc;nm00-q 8-ex kvsp gpiident, 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;e0kpv 8-qmn0-sg x pi of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig.ggh6n- ym +jq2 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 static friction nh-6mgqg2y+j force on the less massive box?

  Two boxes of masses m and cltam 06 9f 0mnl gli.8dh.6qc3m 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 tn0 am..m h0l9cfql l6d6cig8not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inck 22nxgkpt7c)u v; ut.lined plane. The plane is inclined at an angle oft 22u7; ungc)kkpx t.v $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anger6 iena0o18pt98 g1wf d*azc le 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 in4ins*hnl4n v mp he 1+69am;r vmuw-x5clined 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 pds //m:ukt tv3lane 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 di :2 qfkr mb.8evhtm.*xrectly down an inclined plane, at a constant velocity ofb .e2 *rvm:k8hxfm.tq 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 slidmin 6g71yt2rfd8 c bj3es 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 slides down ap2.ceiou)hb 9 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. The cabkvsj6 ind37m2h j(vp84ktn g (le attached to the log jigsk 82k3(7 nhdv (v4jptnm6makes 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 s:udcyi p18)q ,7wqojtilted at an angle ,s78ji 1: doc) qpqywuof $33.5^{\circ}$ 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 inclint4rr jx /ye:8me is gradually increased until the obje: ermx/ 4y8jtrct begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?