Which of Newton's laws best explains why motorists should buc ftc5yu5njt+ky .no4* kle-up?

  When you sit on a chair,uz9 z(x/g.o jhn-ajb, the resultant force on you is

  In the absence of an externabge/.qx.;djskjj7het//--v)zpo j rl force, a moving object will

  When the rocket engines on the starshipod3gpqdib*( zcut) re-p14 v( NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty spapbdp4 eic tdz (u-q3g)(or1v *ce, the starship will

  A rocket moves through empty space in a stran8*hmw/hn1+ gwep :g e1x z3ir1 irc9bight line with constant speed. It is far fhr z*g1ciwh819mn e3r+ b1niepwxg/:rom the 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, facing forward, s 3;g1/n6(qmc; h -reogsjcr vand you suddenly fall forward. You can imply from this /or 3;r1c6ecm q (sj-gv gnhs;that the bus's

  You are standing in a moving bus, facing forward, and you suy:.b;6wktu (vpls4 ) rngntpt:9i-fwddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forw- tnup:t lpbs6 :vnt kg)iy4f .w(9;rward?

  A constant net force acts on an object. *ul t4r,cxej3: vi.i hDescribe the motion of the object.

  The acceleration of an object- txwiwi8 ny3jyv9)w; is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the slv4to a) :jky gslmue4,.7td dp3e(f.ame net force is applie 4laopd,.. leg( v)kdt3me s7fj uy4:td to mass 2m, then the acceleration will be

  A net force F acts on a mas cl- k/a*;kpnas m and produces an acceleration a. What acceleration res/a-c*kknpa; lults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ball:;g5tl h/trr.hswk1n oon will fly away. This is an illust w.lr5hk:;th ts gn1/rration of

  Two cars collide head-on. At every moment during the collision, the .j;a85tm8tnb p+ulybmagnitude of the force the first car exerts on tp 5aubtb +.8mjlyt8n ;he 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 object exe56e4ydb 0qqvx rts on you wilbdyevq0x 65 q4l

  Action-reaction forcemoew4ti/+hp*n eq3 v4)uc+jy s

  Action-reaction forces are +c: ok7v8yrioozh5hz36gq ,o

  A 20-ton truck collides gi* yt+9g i w n1ji)e(5*naldywith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is doney1a+ 5ng(t l*e)gd*9 nji iiwy on the car

  An object of mass m sits on a flat table. The Earth pull+up k r8(d;v;a vadro h1s7hr8s on this object with force mg, which we will call the actihv8u ;as87 hr1p+rvdd; (kraoon force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The otndo*iemmd r 6-u7qvs,2-a ;Earth pulls downward on the toy with its weight force of 8.0 N. If this is thdu,qo-e o2n ;7atmm*d- svr 6ie "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantan-hv9k zl hy/ rlfkr+6,,;br xjeous force. The ball hits the bat with an instantfr/j, lrzhv+kky;xh rbl,69- aneous force, whose magnitude is

State Newton's three laws*(ez6t 6e6 gaz3 khpbh.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.nm9u2 s6q frp/ Which of the following is true about the mass apqm s2n 9rfu/6nd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist )dpd*l 1onqzdj442 tzance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a persuu.cem/3 c6 gna.4 yaion weig43a6 i m.gue/cc.y unahing 600 N?

  A stone is thrown straight up. At the top of its path, the net force acting on7yrwwso*ec* ko*x7 i- it i o-*w oic*r7k7y*x swes

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sam.b7h .5h idf/ cs9bhpge height. Ignore air resistance. Compare their accelerations.b5. bgh fp.idh79s/ch

  A brick and a feather fall to the t p3d(c5lt-ph31)dohwjd- u a/mr0 dh earth at their respective terminal velocities. Which object experiences the greater force of air frictio33 - )r1upodmahd- htc(5wtdjpl0d/h n?

  An object of mass m is hanging by a string from the ceiling of an e.*g uaqm+ovw 90l pq44omroy 3levator. The elevator is moving up at cons*w o4 oq4pr0gy.a 9+qlmvou3 mtant speed. What is the tension in the string?

  An object of mass m is hanging by a string f1hlk;zvey 6:0n4 j.)exu em curom the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the su huex 1n 0ec. :4zm6jvke)ly;tring?

  The force that keeps you zd 5q4g7mgcg;from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy px4tc :nx911omilj 2d +vglu6 carton from rest than it is to keep pushing it with constant 1l ox:d 2i cuxpltnj+gv14m96 velocity, because

  A horizontal force accelerates a box from rest across a horizonta h14w7iem 9h5ht w;aq w(2hdzcl 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 tcdhz5hhhw1i;2qa4ww(e 9m t 7he box's acceleration?

  A packing crate slides os0 ikh 23)0cf.j3t-ah hpy q+hga/ phdown an inclined ramp at constant velocity. Thus we can deduc/so2.a f+c 3py-tqa pjhh03) hkghih0 e that

  A block of mass M slides down a frictionless plane inclined at an angle q with o6w oyz+/qxf* the horizontal. The normal reaction force exerted by the plane on the block o /+oq *f6xywzis

  A block of mass M slides down a frictionless plane rdjcsir)px r2wvgfu*ph+21 +-f q42ginclined at an angle q with the horizontal. *p 2ihsgcr+wu rgp1f +r-2q 4d)fv2jx The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plagp9k 26cf, vyrne inclined at an angle q with the horiz g,kc2yrpv f69ontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simulta;gj 479bvnlvl2xtc-u neously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which besttv; ng72l9v 4l-ujbxc describes their acceleration after being released.

  An object sits on a frictionless surfacesqu48 ft* i.dxus:8 sc. A 16-N force is applied to the object, and it acceleratesqu8*8st. :fxic du s4s at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate fs:ik mg,/ms1lzjeo:m v p u0oo): de59x:(vrv rom rest to 27 m/s in 7.0 s. What is the average forward force on th :sg/e1ou: :lvoiz m5ox,p (m0:dkvm v)9erjse car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 ,w)bif g25zce9+r wapn f i6k.s. What is the nenp.cak +2gi )werb,9 5wzf 6fit force acting on the body?

  An antitank weapon fires a 3.00-kg ro.d59wpik htd8 cket which acquires a speed of 50.0 m/s after tra85i9.tphd dwk veling
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 thaopwmu 17wpn c37orjtasd(01.bud j10 t you push a 10-kg mass from re1uwjj.(d rpopmns d 7ba1w3 c7u1 00otst,

  What is the mass of a person who wdt .bmhj hl5)/eighs 110 lb?

  What is the mass of an object that weighs 250 N g;jotw:rob)7 q82vp bj(qco *on the surface of the Earth where the acceleration due8rg72 )*j; (poo:vq bcjw tboq 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 r:nzqzb5yb 1u v .c6y*on the surface of the Moon where the acceleration due to gravity is only 1/6 of bn 1ybq6zv5cu:z r.y*that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. b0asg9 -hzr 4zbx+r1nll(iv/ The Moon's gravity is one sixth oabl+h9nzxi b-1 r g 4lr0zv(/sf Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of aytq2(rq180 b2ouicz-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 rop8qcu(iy12 0aqz t2 rboe accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts 5n9l ycxwgc+c0 r nv5)on the s9l5)n+c cwv0 5cxyn rgtack, 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 tq6*ysb0vzr d/6k,h5mlavs 6y he scale be reading when the elevazl ba6mrd0kqvs*s vy5h, 66/ ytor is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass o l*9+iwb6 (w6u fuhfnaf the person is 60.0 kg and the elevator accelerates downward with an acceln6afwuui+9b lh(f 6w*eration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the m qcohf 6a)8;okb2n 3iu2ttgga7 1xv6 eass of the person is 60.0 kg and the elevator accelerates upward with a 6)18qhc 2g37kvfex un 6aobi2go ;ttan acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5bfbm 5yv6 29 z1m0nwrs*rm)rk.0-kg mass. 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 t)r 16 n9krym vs20bzm*bmw5r fhe acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in pb8qsct e(/iuny f9t93lace by metal et f9qn/by83 (si9uctbrackets 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 the cab?

  An object of mass 6000 kg r.s2ef4 ngc f2tests on 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 15 m/s, what is the minimum stopping time if the load is not to slide 2fe g .snf4t2cforward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whatf1cbc54 +2 wv pnjqj;l.jzl*o)sr9u a is the magnitude of the accelerationv c2 q;5r 94j l+ 1w)f*.ocbanjlupzjs 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 and m = 0.40 kg, w8 e eqvy(uel,j,c cx(;hat is the tension in the string? (Ignore friction and the mass o,x lejve e (u8y;,q(ccf the pulley.)

  A student pulls a box of books on a smooth oxuvql51,( tphorizontal floor with a force of 100 N in a 5vlu1(ptoq,x 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 (qbg9ymx li-5a force of 100 N in a dir(x- lm 9q5gbiyection 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?

  A traffic light of weight 100 N is supported d0czh alg 6u-3heme/ru/9e +pby two ropes as shown in Fig. 4-2. What are th a3e0cru9+6 - u/e/pezdgm lhhe tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N(mv;izh b+ ti wig()+h, what is the mass of the traffic li) tmigh(bwhz+ ( +;viight?

  Two boxes of masses m and 2m are in contact with each other ogb5v ,bntl a4.n a frictionless surface. (See Fig. 4-3.5,tgb.va 4b ln) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless suwwh uwq;p7v0u,)p: zarface. (See Fig. 4-3.) What is;:w),a 7v0upzw puq wh the net force on the more massive box?

  Two boxes of masses m and 2m are connected b7f 8hf01h dorccp ,vh;;suw/q y a rope. (See Fig. 4-4.) If the forward force on the17qo8f h s h;/v;rh,fpdw0ucc 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.) If the fnt r: d9 dtv4g+t*)myre0eoo7orward force on the9 :+ deod*70tg)ttny rovr em4 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 Figy4q*0(j/ g. + r-tyclmnrzf g ,tpzrg4. 4-5. Box I ofnlr ttrm.4 f0c+zqz-/ gg,g( pyj*4yr 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 frictions betwe, *lrgowr)* exen a 3.0-kg box and a desk are 0.40 a ,r)oelrg *xw*nd 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 kinetic frictions for plastic on wot zc/mybw9bao(j( r;2od are 0.50 and 0.40,(tayjw bo r(/z 2cb;m9
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 dljf+(7bxfk x op bb1b:k /3r8zirection. It slows and comes to a stop with a constx3(rfl b/x:obbkzf 8 1j7b+kp ant 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 q/l9x wwc /ddbre4io5x1rx3qz 23 k8m a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the kr/wq9 / qleox8br14iw3zmd5d3x2 cxobject?

  A horizontal force of 5.0 N as6hh,m, g qh-b vcco3h3 c4*qw92sujxccelerates 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 ofxj7cz5 k5 v)uo 10 m/s. It slides 50 m on th ko5czj57x)uve ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.r8mnine7 y vvhmas;)zpm d*;*g8 h:p,0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing cond;yepmvd ;a* hrn8 p8s*mh)z ivn, :gm7itions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stack5v9n 2o*g. wf,n iehgyed. (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 weg ,v9ifg5* oy.nnh2 is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The suwg 1j+/66irh7sy/ a. omktii rrface 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 statict/yhsa 1mo6/7iw r+. g rji6ik friction between the boxes?

  An object is on a frictionless inclined plane. The 5g wrib;xlw ),plane is inclined at an angl)i,l g bxw5w;re of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hi(ml3r jl: six-p7o gpq(4dthx*w/8 za ll 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 plane with an8* lezw/f *eyn 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 planeda-qm tlt) nz8/m8nlb yqm uz 4-j0..x 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 directly down a,b17( aw korg;wpd 2kcn inclined plane, at a constant velocity of 6.0 mpw,( r2k 1wb; dog7ack/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 down a ro/ /b ha*qcj(( l)t9jjhwamw n/ugh $37^{\circ}$ 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 o/,i feb fgd3-u yi:u2 ;ct-oca 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 3f f.7a;s8w wv qm.ansa rough surface. The cable attached to the log makes 8a.f 7sfqam3v;wwn.s 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 aba -9 g2ck2iiq rough inclined plane tilted at an angle 2 bkgqiac-29iof $33.5^{\circ}$ 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 incli 8qix amx(9 xjj2.kbxq3op04m ned plane. The angle of incline is gradually increasedpx3i (m9xkq.o b02 q axmj4j8x until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?