Which of Newton's laws best explains why mosviiel,76yn)+ g ka8;re -xhutorists should buckle-up?

  When you sit on a chair, the resultant force on yow gmol p6c*sar e /0f:k+ke:.uu is

  In the absence of an external force, a moving objjqw.6z) ,hzddvzkt5l3 k4- a.opxso .ect will

  When the rocket engines on the starship NO-PAIN-NOx0frf ysz4*5 9ih fnr+-GAIN are suddenly turned off, while travelingfryns*f90 hxz 4r+5fi in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. It iegjw)9.x* b8tf4ze)j o u otr0s far from the gravitational effect of any star or planet. Under these conditions, t*t 9ejotrw)egbo)zjx.8 0fu4 he force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing owd+s;ti8oydt*i .6kv1 vfz9forward, and you suddenly fall forward. You can imply from this that the t.fwdvk9oyzt *1v68oi;+i dsbus's

  You are standing in a moving-*kqv dya +s:o bus, facing forward, and you suddenly fall forward as t:o+ qvd yk*sa-he bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the yukktyvxi-uul70 , es oun2(5 m3-2 dgmotion of the object.

  The acceleration of an object is i;p2 +uyk0- rpw)qqu)7kxaxldnversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net forc--.bp)lqe7k (oc a-:lrg sx1ygm- +ce8 wnzlbe islol-1gg p-8-awn cz ) q. b+ :bes(xrk7mcye-l applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces4q.kcy jcak)9m* t 0ul an acceleration a. What acceleration results 4ytlj 0 k)uc*a9cmk.q if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon willnqo+yc..k uja y2 3r.5;fzpmx fly away. This is an il zaqc kxym pj ;ro.yf2+n5.3u.lustration of

  Two cars collide head-on. At every moment during the collif b kokuyz+b/l+*o,j( p2 h9lbsion, the magnitude of the force the first car exerts on the second is exactly equal to the magni*lou,h+of9 2kzb(b jpb+ k/lytude 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 whicq n)eb:m :/,fjbhafpgrh: t20h the object exerts on you win,2 jq0bh /re:fht a :fbg:pm)ll

  Action-reaction force0fkqef r9x:* is

  Action-reaction forces arelr ) stq9 oj-7er;zmzj55ij4d

  A 20-ton truck collides with a 1500-hhi zai)a0 +5ylb car and causes a lot of damage to the car. Since a lot of damage is done on hy a+hzii 05)athe car

  An object of mass m sits on a flat table. The Earth puou0-40i6wcsbdwl ll ku.r; o1(xy(m olls on this object with force mg, which we will call the action b lxdlocoyr0o l0;s 6u1.(ki-4uwmw(force. What is the reaction force?

  A child's toy is suspended from thm 9wv2dq4f1b9slenoc(emgm 6 ee.5l) e ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction forceevw64l m(soedlcfe.)159m2nbq9me g"?

  Your bat hits the ball pidp 1jd/;mx exl o.ihux.w1s b7c. t+q;tched to you with a 1500-N instantaneous force. The ball hits tjpxe. / .1bd;wuxc1i ls;xho7tmd.q+he bat with an instantaneous force, whose magnitude is

State Newton's three laws5a,w hic*sln+qtea p3vdi +;0.

  Mass and weight

  The acceleration due to gravity is l0;bff-srja r+( -ph dmower on the Moon than on Earth. Which of the following is true about the mass and weight ofr mb- rhd-a; (sj0+pff an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a d4zfi9s 59ms eq0kbz2oistance is

  Who has a greater weight to mass ratio, a person weighing 400 N or m0(*wiercp;v a person weighi mw0 ;c(e*irpvng 600 N?

  A stone is thrown straight up. At the top of its path, the net*gh 5)lepf5zf force acting on it ig*lphzf5 e 5f)s

  A 20-N weight and a 5.0-N weight are lazj6)p.u g t6dropped simultaneously from the same height. Ignore air resistance. Compare their accelera)l a t.j6p6zugtions.

  A brick and a feather fal;ygq s: d(3i ntx1th:j;6m emml to the earth at their respective terminal velocities. Which object experiences the great1:imn;tjtyg;dm :eh 3xm 6q (ser force of air friction?

  An object of mass m is hanging by a string from the ceiling 1/f qo(p ginif13m-z(vx zk5q of an elevator. The elevator is moving up at constant speed. What is the tensionki1o( f5nzif g1qx /v(q-3p mz in the string?

  An object of mass m is hanging by a string from the ceb4bj64m5ju+j/p79xv/p uc6 m b ljiu jiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the6 pbcu7j/b4x pljuumj j4 6mb+v95j/i string?

  The force that keeps you frq15kd9r-wc0/ qafgo fom sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it 9w2a4hkbo+ qd7qn h7iis to keep pushi+doqbnq9w4h h2k a7i 7ng it with constant velocity, because

  A horizontal force accelerates a box from rest across am5,t9c hzfa k70mi q l0/mslt3 horizontal surface (friction is present) at a constant rate. haf/35zmt 0ql c7 msit0k9,mlThe 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 constant velocity. Thus we caddt7 xd69ier:n deduce tx:e6dt d7r9di hat

  A block of mass M slides down a frictionless plane inclined at an , ox9- xy(t,:epjfgfnangle q with the horizontal. The-:, 9xfyo nfexg(, pjt normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an q79)vb aa o5jm)u) qraangle q with the horizontal. T uroa)qq)vj59)7 maabhe normal reaction force exerted by the plane on the block is directed

  A block of mass M slide++upt 4ta36 bu1ggglgs down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is direca1gp u +tu43t gg+6lgbted

  Two toy cars (16 kg and 2.0 kg) are r,p+* 8gb6-j4s6 axtww b -trxv/slfrpeleased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accelera w 46tt-b6,w8-gv l+r xsrxap j*pbf/stion after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the oex c 7yei4)f t-w.zc2y)hj9mmbject, and i)iy.4e wtcme2c) f7-9mhyj zxt accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. W ed5p6irt l,f,hat is the average forward force on the cart, l,r 6difp5e?

  Starting from rest, a 4.0-kg body reaches a speed of 8b loc(2p7eq;3knp gtnt2z *w (.0 m/s in 2.0 s. What is the ng 2t(zp ne( 2qlow3kc7ptn;*bet force acting on the body?

  An antitank weapon fires a 3.00-kg rocket whic)(s c 0ux 2w.ydrv*hudh acquires a speed of 50.0 m/s after traveliu0ydv(.)*hs2 c xuwdrng
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 y7fd ,rzu8o5md1)do4 jchks j/ ou push a 10-kg mass from resmufo)zd41h c,r/ d sdk7jj58 ot,

  What is the mass of a person who weigh.gf/ l: np v4:g6gq4h7 wo rkmxfhf60es 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eart49 erki0p 38degici.t 5+itslh where the a5lgis. piiere8 cd40ti k9+3tcceleration 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 objtf, t51(yq bu)j.g umject on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Em, bf)g.j5ttyj1 quu (arth?

  Object A weighs 40 N on Earth, and object B weighs 4ui o )mwb43h+do4+mk m0 N on the Moon. The Moon's gravity is one sixth of Earth's. Compareo3wmmu+ 4id)k4bm+ oh the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg yxbslgg s2f5 d0c:8()q1o mztrope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sxgqcym5 s(0osl2 zb:d f g8)1tue at $2.0 \; m/s^2$?

  A stack of books rests on a lev* v;m43op 6vwlpthk x1el frictionless surface. A force F acts on the stack, and it accelerates ;ml h34pko1tvv*w 6x pat $3.0 \; m/s^2$. 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 (drf87r dj-dy,a:w(6j a obqf an elevator. What will the scale be reading when the elevator is accelerating downwrqd fw-do( f:b,ajd7a 68jy(rard at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator.s nt4h d+65meg If the mass of the person is 60.0 kg and the elevator accelerates downward with an d5stng + em46hacceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevatj.)u jk7i9noud 5ng9yor. If the mass of the person is 60.0 kg and the elevator accelerates upward with an accelerationgujon un y9ik75.)dj9 of $4.90 \; m/s^2$, 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 Nhkz.wp 45ii8 wch r;l, and is directed due north. The second force tow.wci 85;l4 i,hw hzkrpard the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests r:hk;0x alry/ ku8y3 m-;yp pfk4wtp9on the flatbed of a truck. It is held in place by metal brackets that can exert a maximu;xlt/9 p-y :w yhfarkkk8ppym43 0;r um 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 rests on the flatbed ofs,ycishm0j5k +o ,7vg a truck. It is held in place by metal brackets that ca +jc7s,0gvmik, ysh 5on 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 = n).u l,czsl30 xs4 yxa0.60 kg and m = 0.40 kg, what is the magnituda3,ll4.us zncs0y x x)e of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M dmr;ts 8j-0 uvhi*7ko= 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass;-do kmhr0tvuijs7*8 of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force z:vis5yx7v( kus)7 fn(3h rkdof 100 N in a direction of k)vkufis 7ds7hv3nx(5: r(y z$37^{\circ}$ 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 hj;. 9wz- b ol29ag8heb ,ufiflorizontal 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 forcegafl9; ifh-bb,9zj.e2 u8wol on the box?

  A traffic light of weight 100 N is supported by two ropes +,c;xve ts:/xwf 3apm tlj t.5:6igsuas shown in Fig. 4-2. W.g/5mc,at:s:f ujps+twxe 3; 6 tlivxhat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass;v/mdpng/-po v km.c+ of the traffic l/m +.pg/vdp; -ko ncmvight?

  Two boxes of masses m and 2m are in contact with each o6kr1yivj /*s uther on a frictionless surface. (See Fig. 4-3.) What is the acce6*syu1 jkv/ irleration of the more massive box?

  Two boxes of masses m and 2m are in c;32o p((fmra 5mejrtxontact with each other on a frictionless surface. (See Fig. 4-3.) What is therj x2;to(m (f35ar pme net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (S9wmgwm6zfd; vb*9 ar jj/1e;y ee Fig. 4-4.) If the forward force on the more massive box is F, what is;fj w /dv91* 9gzbyawe;mmj6r the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the f ,sl8*po 1- jee teuxiy0fu9r9orward force on the more massive box is F, what is the acceleration of the less massi- 0 9,ueixers8l*fpj9yto1ueve box?

Two boxes are connected by a cord running over ky9;rah.u.+ gb d:4xzbge. nua pulley as shown in Fig. 4-5. Box Ik.uxn:bba dhzr .. y4u+ g9g;e 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 ki 7obi;yeaq3z qygg313netic 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 to33gq 7ab ;i z3egyy1oq the box?

  The coefficients of static and kinetic fc9*4/rlm y 7*msvntip rictions for plastic on wood are 0.50 ans*n9 tp*liv mc47myr /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 di7zgaxd+,j(n f d2cx:;w/ grzcrection. It slows and comes to a s w7rzc(jd,z c /nf:gad ;2+xxgtop with 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 is pulled by a 5.0-N forlpxgbx6f:bz b*5+z aw5 cs) m)ce. A 3.0-N fribl5 gzm5z *bx)s+f:c)wpabx 6ction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N acceler :b3kzbrv q,n) vpx9k5s c3;geates 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 w9e0g jdpd61qinitial speed of 10 m/s. It slides 50 m on the ice before itg9 wpd6e0j1dq stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic acciuo5 v6.zzm1c 2r 0hitpdent, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires 5z0upc2 hmzv1 ro it.6and 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.) ctto7uh+x/ w2fzu 9neo.z;cl, )x; ry 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 bo) /+x tet9fwxo7 . cuo,z lhzcr;;2unyx, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-i2 g k/vd9 2bk7rja1ov6.) The surface between the more massive box ad 291ko kbaijvg2v7r/nd 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 static friction between the boxes?

  An object is on a frictionless inclined plane. The plan7z3) mk8az3kasc +q jve is inclined at an angl3m akacqj 3k7z 8sv)z+e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dfd-*45mx3p w cm btmg)2k ue;gown a 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 plane with an angle of c.m5gciyp.4(aeev o) t*w n/r $37^{\circ}$ 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;x-64fbnvq 5 m82 tcd*pfos gwh, el-h 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 e1u0at erb+o/plane, at a constant velocity of 6.0 m/s.0rbo +et1uae/
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 dom db5dn05s. zgwn 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 do jwlm1zm)q:tn0;d8ubg 8xr 3kwn 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 along a rough surfactoy).*g +1f q*l stl5o gs7csxe. The cable attached to the log makes a +f)5slog1 qyotsg s*.*lt7cxn 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 frc maf/1c q ir7v.s0u(mom rest on a rough inclined plane tilted at an angle sqv/(17c a0m .fimrcuof $33.5^{\circ}$ 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. T.uf3+ e8qik 6ysl1 ciy2coc3qhe angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What isk8qy 33 .c1+iiyf6ques ccol2 the coefficient of static friction between the object and the plane?