Which of Newton's laws best explains why motorists should buv+5.nj l( f f.)caw p;jrqiy,xckle-up?

  When you sit on a chair, the resultant force oz)dor b* j (v6dq4a.etn you is

  In the absence of an external f)2xazvq(:4p 5r6 3nbu xodej jorce, a moving object will

  When the rocket engines on +mmu/r1*(omzcw)j j :s7rt aurvbtg:5zwh,0 the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, thz uvz:u/+js0w(5:tg7m jbr mrmtcr*o) w1ha,e starship will

  A rocket moves through empty sphil;xt er +.,pace in a straight line with constant speed. It is far from t;hx+ilrpe.t, he gravitational 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, faci vl/6ypx1t x)gng forward, and you suddenly fall forward. You can imply from this that th)lpt 6y/1gxvx e bus's

  You are standing in a mom.9om;uxe g;wb2v4;v2il ,ukym ld8 fving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused 89m. yuv 42l;w d;i2xugomfebkm,;vlyou to fall forward?

  A constant net force acts on an objec(+n l(z( y8ttcvrpe(w t. Describe the motion of the object.

  The acceleration of an object is inversely proportional u iys b9 4w4rmz+d**wsto

  A net force F accelerateso.l+ hg r0lz8v a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accelerl+go l8.0vr zhation will be

  A net force F acts on a mass m aehue2twb4 o u/8sr3f * f0l5c2iim nt1nd produces an acceleration a. What acceleration results if a net fo1*28 ocub emfs5rhu30n/wti l2e4f itrce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ba(5nk0 m0gdnlrlloon will fly away. This is am0k( 0l ndgr5nn illustration of

  Two cars collide head-on. At elp vy4:81akc lh)3w mbvery moment during the collision, the magnitude of the force the ) cp: a31mk8lvwl by4hfirst 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 Fj66rui0:kng i on an object, the force which the object exerts on you will0k:irniu66 j g

  Action-reaction forcrwgef9d 0ro4 y 9eux1/es

  Action-reaction forcp ;c(cdk sw(k-es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of dax ,kqq- y.x+q +jclu71sqzo,ur ;l1h y5sp nb0mage to the car. Since a lot of damagqqu ;yxqk5,no p0qls +xu-. 1hbj ylscrz,1+7e is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objecen2s-3 ocv36 bjih*f( q/mgq95py gkut with force mg, which we will call 3sfkp gu(3h-q y96g2vmi / qnb5ej o*cthe action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ea dra i+.zl+hpp(f-mes8,(okf-whdr ; rth pulls downward on the toy with its weight force +;rh ko(si.pd+8fp (a,zwl ef-dmhr -of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with pw ir5)v pi sblqo );:n8hy6o/ (qjx(da 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whpoh bvd lnw:i()8qy so)q5x( 6ripj;/ose magnitude is

State Newton's three lawstmzfso8 id97m, br47 q.

  Mass and weight

  The acceleration due to gravy4w8q 6nrf- yq x4ji3iity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronauti4y8 xr-f46jq wny3q i on the Moon's surface, compared to Earth?

  An example of a force which acts at a d+x,hjd gal t.1ib4 -qvistance is

  Who has a greater weij6j , iv3lwovj(l(bb8 ght to mass ratio, a person weighing 400 N or a person weigh v(j3wblov8ji (j,l6b ing 600 N?

  A stone is thrown straight up. At the top of its par5zx7m-t7 txo3ej wd5 th, the net force acting on ij3 o-drt5wm 77zxe5 txt is

  A 20-N weight and a 5.0-N weight are dropby(qonkt:t611s i1 xoped simultaneously from the same height. Ignore air resistance. Comp:o6 sbx1t( 1t1n qkiyoare their accelerations.

  A brick and a feather fall to the eart.c4 u /xil/o .d8ynlnih at their respective terminal velocities. Which object experiences the greater force odlyn uo .8x/n/4cl.iif air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. :7m/wwr jzb5 d The elevator is moving up at constar mz:57wdb/w jnt speed. What is the tension in the string?

  An object of mass m is hanging by a string from0irsag 6+ yq4 vphg5g+ the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the st5q4rghgsiy6 +g 0+vapring?

  The force that keeps youdwey:1 ec 1p(u6; h(bhn/ofs c from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than itwrs1 )y;n1eeh is to keep pushing it with constant velocity, be n)es ;rey1wh1cause

  A horizontal force accelerates a box from rest across a horizontal surface (fricc.fvh) sb: /s rzgdq9:tion is present) at a constant rate. Thb/) f.:cq9zsgd: shrv e 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 inclined ramp at consygkn+w 61dwbn 6/ybah0r.v0rrf)l q3tant velocity. Thus we can dryr f)dh+nv nq01br0a/ w6lkw6.3 b gyeduce that

  A block of mass M slides d3+srdd+,6 4owgqdk, lnu-vlcown a frictionless plane inclined at an angle q with the horizontal. The normal rea,gqsdc+l ,4 lnk v3do u6+rw-dction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an b r48k xht,rrqyh07dg):cyu 2angle q with the horizontal. The normal reaction force exerted by the plane on the block htrbhy8r)x 2rd 40yku7q:, cg is directed

  A block of mass M slides down a frictionlessa pd-n3ti:/,;g mqn0v kmv7v x plane inclined at an angle q with the horiz 7n:d;tmg0v /-pkmx3v a, qivnontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0oxg)tms5 7f*ru.4u yyxyx0r1m .hwt* kg) are released simultaneously on an inclined plane tha f uutw1tm 5)yrg 0h7ysm*xry4 x*o.x.t makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. zstl-fc . vy 3h)ivmx6vy g2z./dv0*u A 16-N force is applied to the object, a.)vh6 2*3f0/zy - lusdxcvv .tymvzgind it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelqg :k )m*fn5nserate from rest to 27 m/s in 7.0 s. What is the avernn*q :kf) sg5mage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0llwy4 k vxa*3:;q x wvwrdpd.qj* g28mh7+bg1 m/s in 2.0 s. What is the net force acting on the body?aw; w:q v8*jkgpx l3y r42q+v*71bhdgw lx.md

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s :a/zdtth,x(q after a(, hdxqt:/ zttraveling
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 that you x.dimqnkk 6 ;)push a 10-kg mass from rest;n)q k m6.kixd,

  What is the mass of a person who weigxl vpb-qi2)+ths 110 lb?

  What is the mass of an object that weighs 250 N on t( lwz3zoz.u/k he surface of the Earth where the acceleration z(3uzlz.o /kw due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is, rv7; j9zidxn the mass of the object on the surface of the Moon where the acceleration due to gravity is ojn 9,d 7izvx;rnly 1/6 of that on the Earth?

  Object A weighs 40 N oa(ts6;q 7/ew nodveq 7n Earth, and object B weighs 40 N on the Moon. The Moon's ga/sw;6v eeq( t7n7dq oravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-ee 11pp4jc2jn9p zt-qof-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What i z tpecq1jp4p2en1-j9 s Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level fri/g n.f4rrcf;fyqv,t yy(vx-+ ctionless surface. A force F acts on the stack,yn4(xvft +grf,; fr/cq yv-.y 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 elevatoh8k;wpfst ecs5q (), dr. What will the scale be readingdce5 )kthp;8, s sqwf( when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an6ghmu ;pgv.m.jz rz:a w)vlsa6 7y o6,hihu56 elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward.uoy. ;7 h6) iszvl5mvhza,wg6 rug6m6a :hpj 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 of thesow* 54xj75pt e)gimk person is 60.0 kg and the elevator accele5t)w e j75g*oxsik4pm rates 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. r b: d,1h2i ttp3cplt-One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of -pi t:213cp ,rth btdlthe mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held iy a3;vr9z0x sf;o gg:pn place by metal brackets that can exert a maximum horizontal force of 9000 N. When the a;gr ;g3ofzy:p9sxv 0truck 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 a truck. It is, 28sw nmaa+e8e( bhbyf+uo;g held in place by metal brackets thaunm(8 8y+2aaf begs, eb+h;ow t 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 cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what issby l0n 1410xp4yki qv the magnitude of the accelerationl1 iks10yxqn4bv4 p0y of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 k* d/13mggjq 9dbwtz q:g and m = 0.40 kg, what is the tensimgqt bd/3 j9w1 zdq:g*on in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horiz2u81:a zyt r*gl8f j.rfezk .tontal floor with a force of 100 N ina.ulf k yez.trj8:r28zgt 1*f 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 books on a smooth horizontal floor with a force of 1: ei039 +bo *ofycsqvo00 N in a direction of 37.0e above the horsf0b9iqc* 3ve+ooyo: izontal. 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. 4-2. i0tn 6qq)t9ie.. obit What are the tensions in the ropeibq0n.6)ieo tq9it t .s?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is -57jbyk2( evyvf fm4qthe mass of the traffic lightky42(qe mf5vvb 7y-jf?

  Two boxes of masses m and 2m are in contact with each other on a frice+k b,zybvhma7vz-8tbl bsl6e2 ) q48 tionless surface. (See Fig. v8 tbbazbe6sm)7vy4-k2le ,+8bzhlq 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesbf/shlcxlux8 0w q 7 ,vtq4n9)s surface. (See Fig. 4-3.) What is the net force on the muql)q9txh ,s7/xcvb l4f 0n 8wore massive box?

  Two boxes of masses m and 2m are co/ qis05go*m,cgkbi4k10 l lxt nnected by a rope. (See Fig. 4-4.) If the forward force on txtil1* kol0 ,iks5/gqc4 0gb mhe more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.)0 w8 as38ccsgo If the forward force on the more massive box is F, what is the accel a3os0 cg8w8sceration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. Blgzgx -i;2h 9h,iil/iox I of masi i2 hihz9-;/,ilg lxgs
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 frictionf h,j9-5 mp q2y3u4fbwbafz1k z3at4e s 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 m5y-p b4a9b ,kwa3 2zufet 3qj1zhf4fthe box?

  The coefficients of static and kinetic frictions for ph . ne4dh q.:y)y-fpaslastic on wood are 0.50 andeh)h: q.ap 4syf-.ny 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. It sl iw bi2y0sgj-(hq u:i6ows and comes to a stop with a 0 g- (yi:b62qhwujisi constant 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 ia9na6a8 kr x1es pulled by a 5.0-N force. A 3.0-N friction force retards te n6r81ka9x aahe motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a ra/gfgy x g6)*xs.:; dlzxaov7nte of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game,-tgx, f u1lr8q7/s tgk a puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinq ,rglxsgt17k tuf/8-etic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m lo4,4(o6t nvuf g2cj gihb (qco6ng. They determine the coefficient of friction bethjqcoi46u(gg2t6( 4 ,f vbnocween 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 stacked. (See Fig. 4-6.) The surface betweq;(gf1fxnez: 3 nuy xjwv*-v3en 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, wha(-*yzxnq1ef ;vxu:3n 3wfj vgt is the static friction force on the less massive box?

  Two boxes of masses -)2ria(okm9d wfm 8 vjm 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. j 9 )dw(2akfim-or8mvIf 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. w j)( rah-ykauw7y pidqt5f 2f:(el9 +The plane is inclined at an angle ofj huk+(() ea qlfw2wt- f97y:a5riydp $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down abt,:a2k75 m0kzeo xpan zt5w2 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 smooth inclined p z gfeq25tp)x.lane 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 tilhxn-f a3el:*i ted 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 constantb3ar77sz jn)k6 zyug7lc5 9qngp:w: m velocity of 6l ys)g73j kzcw ng:m5:a 9buprq67 zn7.0 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 slidhde s9p +i cf;r;v*it t.t,/wues 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 dow8a ljjo(t z4-.b:xo x,lqq,ixn 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 av *szh jn/vo)4iijt/s4 hv :m7mv ct.5u+b3yb long a rough surface. The cable attached tovu jcivjit+* 5t h//ymm.)4bosvn s3 :4 zv7hb the log 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 rel4whp6 8itl/bv eased from rest on a rough inclined plane tilted at an angle i46 plv8t bhw/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 inclh :me jrbq+cbzm(g hed;cs :5t-uf2 45ine is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the2hq rtbb e 45fjch:gz(u -ms ;dce:+m5 object and the plane?