Which of Newton's laws best explains w 38h+f-tcfx*a*b:*7 ids kv,flk pxb dhy motorists should buckle-up?

  When you sit on a chair, the resultant force py5s8)ex4 fwpsle(8fho3o yu u.6i 0y nvk3w6 on you is

  In the absence of an external force, a moving1 9i)2axtwlx gi8qj x(ko.c a. object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tur +6-u rdz: pglbl-esq xj0;ti1,od(c oned off, b j p ros, 0d;-(luqloxt+z:1deg6ci- while traveling in empty space, the starship will

  A rocket moves through empty space in a straight liemc k5r iv1)d2 tn/q9) huif:zne with constant speed. It is far from the gravitatiom:vt q) 1k e 5h9z)iun/2fdrcinal 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 focuwz urc--d /2rward, and you suddenly fall forward. You can imply from this that the busurcu2 /czw-d-'s

  You are standing in a moving bus, facing l.tid2 ,u x,swk 0q;4h 4xyzzsforward, and you suddenly fall forward as the bus comes to an immediate stop. What fo,sxzqkdz iw0uh4;2xsy,. l t4rce caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objecuaivz/b ia z97.ti- 4gt.

  The acceleration of an object is inverselpns yn2j)2q6q8dcf 84sd9gyt y proportional to

  A net force F accelerates a -d+2yuf xnlyvvd-+5i p16 jramass m with an acceleration a. If the same net force is applied to mass 2av+v6uijd1lxyrpd -- fn+25 y m, then the acceleration will be

  A net force F acts on a mass m and p yuhnt f+o;-re)jtx. q.:ns3croduces an acceleration a. What acceleration re+n ucs.nt.o )jr -tfe;y3xq:hsults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and the*v( u qemt-nb8n release it, the balloon will fly away. This is an ilq-vt eum8*b(nlustration of

  Two cars collide head-on. At every moment during the collision, the magn -ehwbf1t p8op9)tb wuxrv(40itude of the force the first car exerts on the second is exactly equalw(vfhb xt - 4 bo8wp0)eup91tr 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 objecua.jn043jj9;jx f1v6 y f gqzlt, the force which the object exerts on you wilqgfu 1j6a. jvj4fn j;9x 0ly3zl

  Action-reaction forcdgo(ga (.a55wy 2+ yrv k*htjnes

  Action-reaction forces arr)pr e67n ud jaa)a0rw)we84 ve

  A 20-ton truck collides wp k(on1efp4cmgb 85uc4wft3 +ith a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the ca13ocpt+kfep um4 b8gc 4n5wf (r

  An object of mass m sits on a flat table. The Earth pulls7x 2f;bx.n 0n v+ vv;ommdmjs. on this object with force mg, which we will callsvmj7+n0.dfm2.x onvm v;;x b the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth p 8u,r)ie. lsvgulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the)ul,.s8r g ive "reaction force"?

  Your bat hits the ball pitched to you with a 15t 5lhzqndz ;8s,:19 p gpsyt1r00-N instantaneous force. The ball hits the bat with an instantaneoushr,l8st 115zpz; gqsn:9 p dyt force, whose magnitude is

State Newton's three lawavdp,gpc r;+:lwg)+ e0;uwwz s.

  Mass and weight

  The acceleration due to gravity is lowerq )jgep,/zyv q*00fku on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on q)puj*vf,gz y0e/qk0 the Moon's surface, compared to Earth?

  An example of a force which acts at a di f aiev;he6 c,x s9r/72ixjih.stance is

  Who has a greater weight to m/t6ye,/ j bd:ipcl-ps ass ratio, a person weighing 400 N or a person weighingt-e 6j/spypdi clb:,/ 600 N?

  A stone is thrown straight up. At *wq 3+d l8x.dc pi9xeethe top of its path, the net force acting on .we9d+eq38i dx*cl xpit is

  A 20-N weight and a 5.0-N weight are dropped simult*1 966vf ig:yis:up vb; taextaneously from the same height. Ignore air resistanc6 :pxi1e9bt6:igv* vafs;uyt e. Compare their accelerations.

  A brick and a feather fall to the earth at rjd-al69a x9ys o1zzn80 gn;utheir respective terminal velocities. Which object experiejnlzy z;1xrun8 gd-09o69s aa nces the greater force of air friction?

  An object of mass m is hanging by a strinsi1k(1 d2xiy6x ilk0x :rpy3 ug from the ceiling of an elevator. The elevator is moving up at constant speed. Whay:2x3 ikr x 0lx siy161du(kipt is the tension in the string?

  An object of mass m is hanging by a string 6rv-a19 pwb/lyad1k2ou2nz mcsb r /3from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string?rl u-bdm /w2kcna1 3rpv2a/zy9 1s6ob

  The force that keeps you from sliding :cw tn-r0 anjjwlk 0;7on an icy sidewalk is

  It's more difficult to start moving a heavy carton8gsq c(ofy rz6u+p1fg8ev :: z from rest than it is to keep puszy vu:p ze8(ocgs8rg: +fq6f1hing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (frich)z .ufuleej8 -: epjsq.n28ztion is present) at a constant rate. The experiment is repeated, and all conditions remain the sq z: u fj8j n8.lseh.u2z-ep)eame 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 constant velocity. Thus we *w7 7s0 2s:mizs 9 jh0faoyaht+je;mlcan deduce that m7;soem0swia0 j lf97+hyh*z2ta:sj

  A block of mass M slides down a frictionless planefv ke+zcxui +d+tzixc+*a 9d+v,v(f)y l4 yh 6 inclined at an angle q with the horizontal. + i*+tz l,z)yvke cvc9a+huyd+ivffx x+ d(46The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a fri-/)c9ya ju )kxc,pvxe ctionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plk)v cx/ -jxyc9,) apueane on the block is directed

  A block of mass M slides down a fr ek f9h6qx(yopav2x.:ictionless plane inclined at an angle q with the horizontal. The gravitational force is dir.o 6(pqe hvxxa2y9f:kected

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclineqm28:qc3wad xd plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being rela:q 82q x3mwdceased.

  An object sits on a frictionless surface. A 16-N force is applied to tin :g 3nhg5*xcj5waujhjr(8 - he object, and it acc8 (naugxgjj*cwh55 j hn:ri-3 elerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10gwznmf nx2 )-1;s1 lg/v 0 g;fggbm-yl00 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the sbvngmm fy1ll w0;n g) 2g-g-fg1xz;/car?

  Starting from rest, a 4.0-kg body reaches ao + n4ps18dfgeuq2h0zc o6ox4 speed of 8.0 m/s in 2.0 s. What is the net uq6h+84 1z enfp2o4d soo0xcgforce acting on the body?

  An antitank weapon fires a 3.00-kg rocket wha*xrtzkbo-6ucw u 8/ 8ich acquires a speed of 50.0 m/s after tok8t b acz8*wxuu/r-6raveling
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 forceu pg+2hun+:229lc:; pmm gcv pjtezi* that you push a 10-kg mass from restpe2 gu pp2:h+2m;muv ngt*zlc9j +ic:,

  What is the mass of a pers)7 ji1 vryz:0/t vdlfuon who weighs 110 lb?

  What is the mass of an object that weighs 250 N o3vqnu vaykk8d do.,,4 n the surface of the Earth where the acceleration due to grqd novk,,8u.va4y k3davity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What s ,ywddbhd6b(ewv/pj x/. 4 g4is the mass of the object on the surface of the Moon where the acceleration due to gravity is ojx swb/pwgd64.edhyvd(b / ,4 nly 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. T1jy24zzg 1r6uuj,( sp kui;ixhe Moon's gravity is one sixth of Earth's. Compare the ma6jixjgzz k1i u( s,y42puu;1rsses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppositj. asxl ye+ ,wistbl 4nnl4)31e ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates tlsya4 sebxn.t j) w4+1il3 ln,oward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frig tgq; u497iodctionless surface. A force F acts on the stack, and it acctq g9 duig7o4;elerates 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 tj.mfl if6z(f a7g4ln 6he scale be reading when the elevator is acce (inj.f6z 7f6fga 4llmlerating downward at $4.00 \; m/s^2$?

  A person on a scale ak o3dc)liq ww 8om+ /il:;1gprides in an elevator. If the mass of the person is 60.0 kg and the elevator accel3 p1:o q8wl i)m;dk/gali oc+werates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides 3,nu4q +u iefjin an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration of 3qujei,+uf n4 $4.90 \; m/s^2$, 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 ( )d.c4wq roi uz)ejh7N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration h).4o)j dz q(7 wcireuof the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is(dl2kkq)f i+lq. aki, 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 i(f i ,2qqkil k.a)dlk+nto the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is he sk+;:kmx*hr7t vnw 2mld in place by metal brackets that can exert a maximum horizontal force of 9000 N. When thmw+x:ks2 vn7hrmk* t; e 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 qrcu8gz0 j:bmo 0:e2j= 0.40 kg, what is the magnitude of the acceleratiojmj zgu2rq: c:8oe00 bn of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, i;kj8)h ;g so qtos;wfvvb*)5j f M = 0.60 kg and m = 0.40 kg, what is the tension 8) *;o;vw ojh jkfq;s)bs5gt vin the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wided5me4e vav 5, .m9ruth a force of 100 N in a dire. um,adde4emv59v r5 ection 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 ora8r id/: hd,:mey t+wf 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, ae+idr d /hywmt8r,::what is the normal force on the box?

  A traffic light of weighlol6z yx54 j1w3gpz1i/mq3i v t 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in tvg 5l1m3ij o63wzxz/1 qlpyi4he ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is thxu /i; w*yv)r*9ojnhjtgrn 6/ e mass of the traffic light? )w6j n /jo/t9;nrx**iuryhvg

  Two boxes of masses m andbsdt4:(q8sto h/wqk*qn + n:u 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the mor+q hsonbs(kwut84:t/q *:dqne massive box?

  Two boxes of masses m and 2m are in contamtzwc,u 1,.kg6; aimsct with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more m.i 6c;tzs , mkam1u,gwassive box?

  Two boxes of masses m and 2m are c rb8u 6decv48monnected by a rope. (See Fig. 4-4.) If the forward force on the more massive 8648b vrdecumbox is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rou j58hp m7 f8d(yhvl1as*zb7tpe. (See Fig. 4-4.) If the forward force on the more massive box is F, w(f7p7jy tlhza5b8d8h* musv1hat is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-f br eee5woso)al04y,o:n h / 1(wrvq-5. Box I45 o,oel :a b/r)q0e vwfsh(w 1o-rney 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 kinetic frictions betwe qnh*ak1j /s5q7y .ukten a 3.0-kg box and a desk are 0.40 and 0.30, respectivelaks7q5 uy1t nk./*qjhy. 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 ogz7piyrlgd q.) w*0.mn wood are 0.50 andi).*wr07 .pzgq gmld y 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 sur 5)tpwd wqn8, y4-f jv4pua8r)nlvf9o face in the +x direction. It slows and comes to a stop w-8joaw p8 n95v)ff 4wpq)ld v4,runyt ith a 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 nde 3s/ itm+h17pl/ewkd j2j5 is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What i 2j/se 5itdjlm 3ek1 hpwn+/d7s the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4 mciqj)08b8yc .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/(h y;4) hmt2ha1bzgs hs. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction mh 1b a4hh2h(zt;ys)g between the puck and the ice?

  During the investigation of a trd):7qga acmj3affic accident, 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 prevail7)cmdg: 3jq aaing 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.) l kflmmwfn5v8/.ww3hb4 h a v-k,+3ze 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 sta/la mvm3z5+b elhk-8vh3ww,nwf.f4k tic friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface 4zc13+8gmt kephbt 4lbetween the more massive box and the horizonbg ztec34 kp+ mh841tltal 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 static friction between the boxes?

  An object is on a frict8,iqc ny /q/8emxgm p;. xnij;ionless inclined plane. The plane is inclined at an angle ixn ;,m/nxepjic8m /qq. g8;yof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes as7zi(2 e; rdvphnu 80wn 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 of slke(v o7h: cbgg 69y7$37^{\circ}$ 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 inclinf/rfuu :2f g xwn)5w;fed plane 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 slidef,vlmny q::3p mto::+do k vl*s directly down an inclined plane, at a constant velocity of 6.lkqn: p*+l:ot,d ::mfmyvvo3 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 slides dowe -+ hyd55j a3fdnhz6tn 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 slides4rg2y irlv/ p, 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 alo)sq2gw q vmo,dr00l l2ng a rough surface. The cable attached to the l)sd2q0r0llm,wg 2 qvoog 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 m r6c lp2 i;udcx.v*zpqw0*b:rest on a rough inclined plane tilted at an angle ldcwpxp2q:0uz.ci 6m*r * b ;vof $33.5^{\circ}$ 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 ovcsqkeba 103l e9fr23r:ljn/f incline is gradually increased until the object begins to slide. The anc9ekf3arsrql32b1lv n e0 /: jgle at which this occurs is q. What is the coefficient of static friction between the object and the plane?