Which of Newton's laws best explains why motorists shoul xti7gh iak2 6p2c0t/5hlr,jq d buckle-up?

  When you sit on a chair, the resultant force on you i:krgcd u syvk0k/943 xs

  In the absence of an external force,kqyxi*y nb0 w*er o6)ssxnj y:x(925x a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off,r*vgo:96 2qp.epwqj u while traveling in empty space, the sr w26upeo :g*9 p.jvqqtarship will

  A rocket moves throug9 w2zy 4bb1jc /c9/dunu2k wmyh empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditionsjbz 92c w4buy/ n/ cwyk9md1u2, 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, ako)-tr,ap 2rind you suddenly fall forward. You can imply from thir at-ik,op 2)rs that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwarfg* u9m)my4:r*zw 5i0s)ht rpk b j4hjd as the bus comes ) mujwi*:z4shgypr h br *mtj49)50 kfto an immediate stop. What force caused you to fall forward?

  A constant net force ; q6mzc-cr s)v49tw hlmpl3 g-l)gzm*acts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proport/ y nee* +i qq2wqpgug11lg0)azjk1g- ional to

  A net force F accelerates a mass m with an acceleration a. If t:s c zpywt.3b2*jz 5jghe same net force is applied wj5zbz3 ygscp j.* :2tto mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an a+i7v rru/wt 9:iw cad/cceleration a. What acceleration results if a net force 2F acts on ma7 idww:rv9/ + ictaru/ss 4m?

  If you blow up a balll/f em0wd)fgof o3v:ac8 oh*9 2u)g2:kw q ibooon, and then release it, the balloon will fly away. This is afwg)o2cfo93m wlka i2e) uv8bg*f dooq0: h:/n illustration of

  Two cars collide head-on. At every moment during the collisqj;;:i6oy1f san 5z0wy .zcy0gvn* klion, the magnitude of the force the first car ev.;;n1 zcy wi*5f 60 j yzqkgnlsoya:0xerts 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 on an object, the force which the obfsnq ew:fs(o,g v2;a8-5d pctject exerts on you willw 2ngf s astf-8d,vp;5q oc(:e

  Action-reaction forces,r2rw0 ojg0u g

  Action-reaction forceso k 798 c .uwzhrlncvn+e a7x+qb:wx1. are

  A 20-ton truck collides with a 1500-lb car and crcwv4p:b*k aj s8wm23*)f lhiauses a lot of damage to the car.jpmc: 2f 34lw)v s kir*w*8hab Since a lot of damage is done on the car

  An object of mass m sits on a flat table. The *:zsgl4 avsd3 Earth pulls on this object with force mg, which we will call the actisd:3 zal 4vg*son force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a stringhl jih41 v-6ro. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "activ1holr-h i46j on force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous for. .x kjak2k6qwqy+oojz8/ ti6ce. The ball hits the bat with an instantaneous force, whose magna. jwxo / 6tk2oi.+zyq jqk68kitude is

State Newton's three1yk867mo3syv8wznq w laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon r wf0 z2a8ywoh eykr*qo; gh0a+bo/ 33than on Earth. Which of the following is true ay3;b/2ehz*0o a8+fwr yg 0whr3a qo kobout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance wh 9f lekhc-5n1 ),:ox)wpn ghis

  Who has a greater weight to mass ratio, a person weighing 400 N or ao-dffm85o+m yu2 z .uz person weighing 600zo2 mou u+.y8 d5zf-fm N?

  A stone is thrown straight up. At the top of its path, the net force acting onr dt2y oj:+: 6fpdzu2s it i:o tu22 p rzysfj:dd+6s

  A 20-N weight and a 5.0-N weight are dropped simultaneously a5dcqrr( ,a8jfrom the same height. Ignore air resistance. Compare thjr (aa8 qr,d5ceir accelerations.

  A brick and a feather fall to the earth aotytyp8l0m; *t their respective terminal velocities. Which object experiences the greater force lopy; 8tt*y0m of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevato;9sca a y(2fnar. The elevator is moving up at constant speed. What is the tension inn f caaa29;ys( the string?

  An object of mass m is hasvcc*mrqexhe0o8*wo6 n ,4e. nging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What ,wr*ecm0.8seo*6 q 4vxo e nhcis the tension in the string?

  The force that keeps you from slidin99,hsq :yxn mog on an icy sidewalk is

  It's more difficult to 0 ul(d oo+g yzb1dzcfu31iw5 *start moving a heavy carton from rest than it is to keep pushing it with constant veu1 zcg*f1byld(od3oi+5 0z wulocity, because

  A horizontal force accelera9bd.s 1eu; u.z kfckvvs9,kxmur4 *0k tes a box 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 ekk9u,dk.0 1 *evu zcsk rv9fsbx4;u .mxception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an incli ih vl cd:fj6+ fxwoe*(4ptk8;ned ramp at constant velocity. Thus we can dffi:cvxkp+h *d e(84t ljo;w6educe that

  A block of mass M slides down- bzx- s2wac5)jb/fno a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on t2cn5fzs- )jo a-xb/bwhe block is

  A block of mass M slides down a frictionless ps7tqr gl9. (2fy:* p/ncmy dhhlane inclined at an angle q with the horizontal. The normal reaction fm tprhg*( q:y/chfy92d 7.nslorce exerted by the plane on the block is directed

  A block of mass M slides down a b8x z9bp9mg trb/ -vaez8*r(q frictionless plane inclined at an angle q with the horizontaz9bve8-b8(/qp zr* 9rmtxg bal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined planw5 v nz2jkdcny:1hh r6.jo6t 8e that mazwn8hv t2r:hjkn 516.ydc6 j okes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a fdt0k cf77aw)s l)p:ww )v 8rlrrictionless surface. A 16-N force is applied to the objectfwclw rlwav))k77dt8 ):s p0 r, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelt eh4 lhu)4t4uerate from rest to 27 m/s in 7.0 s. What is the average forward foth4h 4)4eltu urce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whatkk fb:,oon sm 855pgl9 is 5l, bf 8s:kmo9opk5gnthe net force acting on the body?

  An antitank weapon fiai1 kvd8 5ua mvx0sj)o; yu34t/hxs 7dres a 3.00-kg rocket which acquires a speed of 50.0 m/s after tra8s/u0xavak1jt7 iud4mho3);svy5 xdveling
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 r 8w1 pv-c qmw4w,f-iuforce that you push a 10-kg mass from restvi8ww-w1 ,m-fuq4pcr,

  What is the mass of a per et4)0xzew*s ifgqy 0;son who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of tdrgc+/ )l ro9b9 k*e ( /cxr:qzd-btwjhe Earth where the acceleration gld /-wrxjt9/ qrzodc r:b(e9+k)c* b due to gravity 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.lr 4s6j cvzt( the surface of the Moon where the acceleration due to gravity is( vr4cs6t ljz. only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. Thl fkj2o d,a0yd+y2yh+e Moon's gravity is one sixth of Earth'ka2dyydo+ y j 2l+,f0hs. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rp*l 9k ) ad)q)wzems nd4+ocl1qzz.b- ope. Sue pulls with a 15-N force. What is Sean's force if the rope acc.elwpzs ldz k4 qa1m)qbn*d )-z)9 c+oelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless suru 9r pt2i-dv+zface. A force F acts on the stack, an2i 9zpv-d+urtd 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. Wh.reh+/menqzh c ou.v02o ybrq .k/h3xg */c,lat will the scale be reading when2qh o rc,3 0.*u/c qhozvy/lr/emh xeb .gk.+n the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevato0g pmzxt+ i ;;c)trgq)-,ofc/pos:mzr. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration offsxm) 0gp:+z qt-t/;c;)mozpi, go cr $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the pen9j6 7sto+up rrson is 60.0 kg and the elevator accelerater pj97s o+utn6s upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a* s2assqqes 0ab2*fh- 5.0-kg mass. One force has a magnitude of 8.0 N and is a*2*qf2esbs a -0hssqdirected due north. The 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 flatbedd2owv a+k+6 un 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 15 m/s, what is the minimum stopping distance if the load is not to slide forward into k 6++2dw aunvothe cab?

  An object of mass 6000 kg rkgqx;4p e2f1s 8ss an*ests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 900k 4fpxsgnea s8* 12s;q0 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 =p 7u0 rk).u:5j7 jv/lssnquap 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)jk ua/r.)v05n7sq:s7ul p ju p

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = k3 nta(:t jvsu3*-psi0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley.)p :u-ssn k3*ji tva(3t

  A student pulls a box of books on 6cp0e :f8oxjb ic2*lf a smooth horizontal floor with a force of 100 N in a directioeco6f i c28lb:j*pf0 xn 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 floor with a force of 1gs+tzwr:x viyr1xw9 , /td6q( 00 N in a direction of 37.0e above the tq9x+:rstzw i/1yrw(gd,v6x horizontal. If the 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 supported by two ropes as shown in Fig. 4-+qkaf+ nxpo;+9ecb j3/ odl+w2. What are the tensions +ako /p+;+lfc3xn od9wbj+ eqin the ropes?

  In Fig. 4-2, if the tensir 76, dg cc 7;o-sxcm +yqw;vh18rlhchons in the ropes are 50 N, what is the mass of the traffic lig vs +x-crqhhy7,h8d71cwrc ; clo;g6mht?

  Two boxes of masses m and 2m are in contact weq; e,ncn2p90o1 gc bzith each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mq1pc9zgc0o;,2eb nen ore massive box?

  Two boxes of masses m and 2m are in contact with each other on anr1) 1 f;asu)l7vx lkyiil5r6 frictionless surface. (See Fig. 4-3.) What is the ir sk1r6nll;5 v)1luxf 7 y)ainet force on the more massive box?

  Two boxes of masses m and 2m are connected by7jc5t7l,xp sa a rope. (See Fig. 4-4.) If the forward force on the more massts7 ca p5jl,7xive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connect 62p;cxlw*mip z 42fevhjy s9-ed by a rope. (See Fig. 4-4.) If the forward force on the more massiiv pyxjz4em 926-cl;pf2whs*ve 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-.9bn4.ofnn o d5. Box I of mn .b9n.4fn oodass
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 -7wjlo o*7r9xd x rmy5and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, r 5yoxmo97*-j l7rrxw despectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of staticgmzxl3b5b2 1u and kinetic frictions for plastic on wood are 0.50 and 0lx z35b2gm1bu.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. It slows and comes to zkn8 vxy9v9r;wc lbpjg 2l12-n6i b1ga stop with a constant accelei-ln6 l 2 928kgbgxycv9br;p1vn1wjzration 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 y-sv5uuje0kkx/k0m 4 a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. Whaky uuj v/kekxm 50-4s0t is the acceleration of the object?

  A horizontal force of 5.0 N accelrqtm-nh0z i (+erates 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 puck is given an initial speed of 10mu:gc 9 e )t8qe8:kgrr m/s. It slides 50 m on the ice before it stops. mguk) cg r88:: etre9qWhat is the coefficient of kinetic friction between the puck and the ice?

  During the investigatih19f2fsq7c 3x )mqs nxon of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction xs2nx9)f7 13h qsfcmq between the car's 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 3m are stack9ecuw0sao q 3 w(1ddzw5 ;nt1ped. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is z51(9 cps0;dw3t1wde aq o wnusmooth 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.1eofu1,lt(wgdc/ c e)n vnarp 8 -y:p6 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 statcu)dpae:wy(l o, trcvn 1e86-/1n pgfic friction between the boxes?

  An object is on a frictionless inclined plane. The plane iszkasv1p/1-vg (mjbs 7 inclined at an angle of /( jv1gsb71z-ma kv ps$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill th8 r4,(jg24jdirednf cat 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 smooth inclined plane with an angle;ybl iva58 hth:pr1k) 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 tilted at an 3c,d7+usja0*q w:a.cmi/lge4/c2h p x vulcu 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 constt 4l.3 yp1t.,em8 iodkter(hts;yns4 ant velocity of 6.0 m/s.43y e syi ,r4k.8.1n;(ltdteosp ht tm
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a masm38pi1j:lt ub :up af1s m slides 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 depd 4+ 32 po(ffduncq4cc u(a w39oz*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 alon f7-v(b soumt3,fgn 3.gwtr3jg a rough surface. The cable attached to the log makes anrvf( no7j tg3 -uf 3tw,mbs3g. 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 inc:g-5aludz,g 4 (ahzlqlined plane tilted at an anglel,zd h:z(qgl4-agau 5 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 ux+3( ,nfg/uru v8rtkon an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the v(,xr utng83 k+/fru ucoefficient of static friction between the object and the plane?