Which of Newton's laws best explains why motorists should4q: okraj9 wm e+agla(5:vr)u buckle-up?

  When you sit on a chair, the re 5ok./nu v*l n+r8cb-yb xlb8isultant force on you is

  In the absence of an external force, a mt kt22dyktcq1 r xi/+qg8bid: 1 ,r1whoving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN as f. m+br8wrn1re suddenly turned off, while traveling in empty space, th rmrb81 w.+fsne starship will

  A rocket moves through empty space in a straight line with constant speet hrhvn w w)b;8qg+)i(d. It is far from the gravitational effect of any star or planet. Under these conditions, the force ttnbg(r))wq;v+8 ihh w hat must be applied to the rocket in order to sustain its motion is

  You are standing in a 1n-v(:a djfyrmoving bus, facing forward, and you suddenly fall forward. You c ny-aj:(d1vrf an imply from this that the bus's

  You are standing in a moving bus, facing fo (0zgls am0f95gk7uusrward, and you suddenly fall forward as the bus comes to an immediate stop. What lu9z ag 50m0( f7usskgforce caused you to fall forward?

  A constant net force acts on an object. Desc/-txmma ; v3vuribe the motion of the object.

  The acceleration of an object is inversely proportional 6oa 6+5mse0mqkzv cr 1to

  A net force F accele0rw; lp0.+k 3a,v q 1weaaj4b)lv9bve eu+igkrates a mass m with an acceleration a. If the same net force is applied to mas qagevk ;bp1 v+l e ai943)auewkbwj00r .l+,vs 2m, then the acceleration will be

  A net force F acts onyhjw/ t-8 /3 c.8dl7g+nyxkaimf +nqx a mass m and produces an acceleration a. What acceleration results if a net force 2 n/c7+.tnq y h8gidl38a xym fk+-jw/xF acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly aw .fu1edw5p9j0tvz k5kay. This is an illustratk5t1zwjpvuf k50 e9.d ion of

  Two cars collide head-on. At +b nsfvlqtg3f60 bu,teq(d+*, rx 9yd every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the forcu3b6+s 0vxfng+qtr,*9 ddefly(t bq, e 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 objeu; jpkwkjo rj6xjq70)(3-ta zct exerts on you willr jt;(u w)0k-z pjo63jx7jqka

  Action-reaction forces-dexr.wi,;akmu -r ,3ek yam u35 1ghw

  Action-reaction forcesn 9 s3r6uy8xmbe(3r9vvaorx / are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car17ij xr, 4ieh4q bz/uq. Since a 4i7hx,qrbzqi/ej41u lot of damage is done on the car

  An object of mass m sits on a flat table. The 3 p45igu b6cqjz)nl(0c(gzao:w qf .fmia8 )kEarth pulls on this object with force mg, which we will call the action force. What is the reaction for4o:.0 m zfuqqlcic6a)8 pa3wgg zj5(f)kbi n( ce?

  A child's toy is suspended from the ceiling by means of a st kvmm/h)zrc48* rs8fw ring. The Earth pulls downward on rm v wr)ksfm88/h* cz4the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with stmo /lw0md8m: 89p fza 1500-N instantaneous force. The ball hits the bat with an instm/tpow8mf08sm z9:l d antaneous force, whose magnitude is

State Newton's three laws.*vsa0;xazu6kg(ges 1zd( z ;h

  Mass and weight

  The acceleration due to gra*.z(/r9zzh1 9t5u i-bwpsriv0pd vp n vity is lower on the Moon than on Earth. Which of the following9vh50p- sndr9 uv.pz1z ib/wt(*i zrp is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distanq.l+yy inhdl 5ku (+m)ce is

  Who has a greater weight to mass ratio, a person weighing 400 N or a pers:*nejyw7xbe5 rb y/h* on weighing 600 N e/r:*y j7nb*5hxyweb?

  A stone is thrown straight up. At the top ogpeho. erl; 9fu)l2q),al s4g f its path, the net force acting on it ).9a,l lhqfrlepuoe)g;g4s2 is

  A 20-N weight and a 5.0-N weight are drop 76j*m3ts *v+ pyytug8oh: bvhped simultaneously from the same height. Ignore air resistance. Compare *u3gtv jt*h +m7svobyyh 8p6: their accelerations.

  A brick and a feather fall to the earth at their respective terminal velociti(pk aj.qj 4nn1es. Which object experiences thejn.k np ajq(41 greater force of air friction?

  An object of mass m i,wvxoyvi a 9(7c/) g: hlod4xks hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tensi7h) g9x,avxk4 (lv odc:/wyi oon in the string?

  An object of mass m is hanging by a string from the cvh p:iwz )cf3ae v*5aer, d)p;eiling of an elevator. The elevator is moving upward, but slowing down. What za)v;)3e i,dp ah wfr*5ecp:vis the tension in the string?

  The force that keeps you from sliding on an icy si442rsam 6bzu0am0 2ufqnnc0 8z; iftwdewalk is

  It's more difficult to start moving a heavy carton from rest than it 3q-tw iw5egk/y9y.p7p*o zer is to keep 7eq*w-.pyywgke opiz3r t/95pushing it with constant velocity, because

  A horizontal force acceleratef3d.:4b n e 4n*(eez,uddb eeys a box from rest across a horizontal surface (frict debb3u enn.fe:dz( d4* ye4e,ion 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 box's acceleration?

  A packing crate slides down an in/3)h nnm;jy gwfbh( 3cn8ux0k clined ramp at constant velocity. Thus we can ded(k3 hc8h/ x3;mbg0wfyn)jnn uuce that

  A block of mass M slides down a frictionless plane incl,(e njwzmd 4k )usbbx35okgoq1vg .8 )ined at an angle q with the horizontal. The normal reactionkz83nx)5v1(g,ku )g4dobo je q sw.bm force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an anglaxz ny- dr v49up+4;tse q with the horizontal. The normal reaction force exerted by the plane on the block is direr+y pu n94szt4xd- va;cted

  A block of mass M slides down a friction72a5 0wi8mbvkao0 cq eless plane inclined at an angle q with the hori0 b2w a05vk maoeq78cizontal. The gravitational force is directed

  Two toy cars (16 kg aney+6upgh,hf7 9uw 4sb d 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accel wuyhb hsfg p+67,eu94eration after being released.

  An object sits on a frictionless surfaorvlp.sg57 s:/h:oy tce. A 16-N force is applied to the object, and it acceleryh tol:r5g7:pv .ss/oates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg 33)d(4xussodo pq1eg can accelerate from rest to 27 m/s in 7.0 s. What is the avexs4oud3g )qsde o p1(3rage forward force on the car?

  Starting from rest, a 4.0-kg body res.gxogox 8 td3u2c6 .iaches a speed of 8.0 m/s in 2.0 s. What is the n.xcd xs.tio 8g23ou6 get force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speezbo/r qk/ 07ytd of 50.0 m/s aftebko0y/q/ zrt 7r traveling
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 sammaeh gk4n+g *e:am4 ;0aqdgb1e force that you push a 10-kg mass from resth *e+baggma 4 a;ndk1:e g4qm0,

  What is the mass of a person who weqm 0ug-+ieh cd8(a4xw 13p iyxighs 110 lb?

  What is the mass of an object that weighsnrmsq y4z4epqh7k1tt /*0ii (if87yj 250 N on the surface of the Earth where the acceleratioz 4s7tqj k8yt 10fpriime*inq/(47hy n due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is th)km;ftt ; uxcmm8n8 *he mass of the object on the sur ;ut*f8 txm) mnmh;8kcface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and obbfmw * /t0ji hkfgn5f5bkz:r9e 9 )pw5ject B weighs 40 N on the Moon. The Moon's gravity i:59 ikm0jh ge t5wf) */krfbpzbfw5n9 s one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war k 7ipmm2-vb- jby pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if thb mk jv-2m-7ipe rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force 1 px,lj1ainfiektj25egslmmp m90f+0 y 0s)3 F acts on the stack, and it acce9 )xgm3 j0t10sm5nkj iislpefy p,ela0 f+1 2mlerates 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 elevarnjle z-dek2 p(bl8nfy*g :px .49s/ntor. What will the scale be reading when nl. jferdp9 kgn: 4b (esx2y/*lpzn-8the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides iztdr/x-z q9jm0b7hy (n an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acc0d(b tr jyqhzxm7z-9/ eleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in d0yj;5c, 3+nzppv ys ean elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration ozsc ;d v,5e 0nyyp3+pjf $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a magnitude of 8.0 jf3ps*(ko :tau: da,gN and is ds (*:j:t3fau adg,okpirected 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 flatbed o(kbse vn27b0(ct mgk/f 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 st2ves m kbk(/(bncg7 t0opping 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 held inum uq l4dy09ln17cww* 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 forward into tyd07lu 1cnl9m 4w*w quhe cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, cvnbn-age -.vi33db s 2a4ov;what is th;oa4-3.vdbgv - 2vbc i3ne sane magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if d-w sm5+e8pcz M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of 5-+pd8z swcm ethe pulley.)

  A student pulls a box of bor *fdv0 g0fb2et *qr2aoks on a smooth horizontal floor with a force of 100 N in a dire02dr*r0g* 2te qf afvbction 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 bird :pa1id2c 0ooks 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 thecad12id r0p: i box?

  A traffic light of weight 100 N is supported by two ropes aspg:u1h1g4iez7 yv e0 e shown in Fig. 4-2. What are the tensions in the ropes? p 410u:g iye1ge7zehv

  In Fig. 4-2, if the tensions in the ropei9mhm03sux 9 is are 50 N, what is the mass of the trafmm3 s9i0h9uix fic light?

  Two boxes of masses m and 2m are in contac+8.gfn8u,w4 u+wkqrfkntl7 i t with each other on a frictionless surface. (See Fig. 4-3.) What is the accelera n+wlrkkg4 ,q.twn7u8iff8+ ution of the more massive box?

  Two boxes of masses m and 2m are in contact with each other b;bkni4*8eupv 2 okg-*p5 tfton a frictionless surface. (See Fig. 4-3.) What is the net ft pnou*bkbf5*ipk; t2ev4g-8 orce on the more massive box?

  Two boxes of masses m and 2m are connected by lnbhl/1:2civ9z2 d x ra rope. (See Fig. 4-4.) If the forward force on the more massive b/ l:1z hc2bindr2x9l vox is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are cv6b)xg4 cevuwb1g 5n e0,k:z konnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelerationx kbc:zv, 40bu 5g6vkg1wen)e of the less massive box?

Two boxes are connec)-tc/u ii p*9e:gqbl ated by a cord running over a pulley as shown in Fig. 4-5. Box i-i9gt /)c*al upeb:qI 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 kine1:6n0p ls fbrftic frictions 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 the box?bf:l16r n s0pf

  The coefficients of static a-l bn4u: wh/ aby(n rm+owr5t7nd kinetic frictions for plastic on wood are 0.50 and ww b+a4bl r7(r: o-hunnym5/ t0.40,
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 ce35hm, mm;fi+x direction. It slows and comes to a stop with a constant accelera ;fi cm,53mmehtion 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 pokw -hz/ .rl.xbf*3xe ulled by a 5.0-N force. A 3.0-N fri 3flox x/ bw-erk.*zh.ction force retards the motion. What is the acceleration of the object?

  A horizontal force of 57 ( mqv1lyxr02pkz/p x.0 N accelerates 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 10 m/s.- ( hw ytz1og7wvdz38a It slides 50 m on the ice before it 3o1g zyz-w8(ad w7thvstops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accidenv7td/: 1qxoyx t, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires 7qd :vxyto1 /xand 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 s.u /pcg5q 8rywurface 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 fry w.p u5gcqr/8iction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) ycz 8uwp6g5k.rhda )rcis 717 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 coefficien)5przg17k y78rc6uh i. sw cadt of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is ilnau l (rv:(1ap3ah2j nclined at an angll3a 1(hp(laranvu 2j: e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle 0bsg o(8zkfb:d y,)mq9 oqdg ;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 incliky9ep in(a0 r)ned 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 s-w2a,:x - j5 cuhrtno5b aia4plane 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 directlq 2, qmlnff8jv/:( leky down an inclined plane, at a constant velocity of 6.0 /fq,2 elj8vlkf(q nm: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 slim rf55 o.wuv/wqk( ;zxdes 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 s2 h*wgcpx 44nwnx(j4t f-h , so9am,gslides 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 loxjb v( (zm0u0qijs .p 5*uj67spas:by g weighing 500 N along a rough surface. The cable attached tusy:xv mi0j7 .q 06jab (jp(zbp5*ss uo 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 released from rest on a rough inclined plane tilted atbk5diclc.u k 43 aszkwbq. r0r-g2b+ +uj **xo an angle of*c3oa+ 5b s k2x0rb- j.dzbr.u gqk4+i*k lcuw $33.5^{\circ}$ 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. Th/i5c)8bg.v(mchy jg vatw/l ,e angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficien8l)yvwcm/b. (ag 5 tj/,cihv gt of static friction between the object and the plane?