Which of Newton's laws best explains why motoristsmrw) hyptz 3y1fo;4viuw(u9/,5bjs b should buckle-up?

  When you sit on a chair, the resultant force r0lhbiktvc:d qj goq6m9n-hz b680 7 *on you is

  In the absence of an exter 7+r/ w2pngrhdnal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned o yumc7 gr*8r,ux0vz kv1 iqgp:+1i ro5ff, wh1v ku:umrxrr7g,0 ic85+gzv* ip1 o qyile traveling in empty space, the starship will

  A rocket moves through empty space in a strv/:p rie*z r2pboz1y*t0 4t tqaight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustapqzv trz0y4 t*r1bpo e *t:i2/in its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forw2 i/ai vtu:mbd8( li7kard. You can imply from this that i ili:a(km2v7u8/ tb dthe bus's

  You are standing in a moving bus, facing forward, and yh go;+4be 6)yebgpw q-ou suddenly fall forward as the bus comes o6p-ge) qyb; gbh4e+wto an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objec 4wum*j(y7k4zlj *yvht.

  The acceleration of an object is inver1n+q *eugk6k e rjo;(rsely proportional to

  A net force F accelerates a mass m with an acce0+e zyg62bt- 0sbb1ujrr yu1h leration a. If the same net forc-10 ts0r yhe2u6bbb1z gu +jrye is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration r*zu5mtueb m+c, 8bi6*i :ujka. What acceleration res iz+8bcr,6j *u5miumku te* b:ults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then releah) gbbp/ f:o;ese it, the balloon will fly away. This is an illustratio/fb beg;o )p:hn of

  Two cars collide head-on. At every moment during the collision, the magnitu2id x9wfkyjl7 pq6a4 ,de of the force the first car exerts on the second is exactly equal to the magnitude of the force 7yi9p qx,awj 2k4ldf6the second car exerts on the first. This is an example of

  If you exert a force F on an object, the ) pwzz hg2kc (jc 950qg5gxk1mforce which the object exerts on you willkkx95 2h1g 5gqwcczjgpz )0(m

  Action-reaction forcesbx:htgs;4ogdpn1 b- -

  Action-reaction forces)ej m+pk*wp wc8vu -)p are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to e+q:ii,tv/ yeu 60b1cx zvu2qthe car. Since a lot of damagcvxibu vi:zq /y1+e0,6qu2te e is done on the car

  An object of mass m sits on a flat table. The Earth pulls on*ocb*8j xh)d v o:tg cj1 8*lr;dhjc/i this object with force mg,co;cohbj/c j l gdr)vd*j xi**h 1t88: which we will call the action force. What is the reaction force?

  A child's toy is suspended from thj 8wyl,ju 6)l0e )qzoie ceiling by means of a string. The Earth pulls downward on the toy withl e wj))8uiqj,oy6 zl0 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 a 1500-N-l9ybw ah y fvn/:*( bw7mj2qs instantaneous force. The ball hits the bat with an instantaneous force, whose m bnwbhlvm 7awyj/y fs*q 2-(:9agnitude is

State Newton's three laws.s :lp2nfpzg*jc gb112

  Mass and weight

  The acceleration due to gravity is lower on the Moon thmes3r4zp03 hl zmf/l -4t zxu:an on Earth. Which of the following is true about the mass and weispzut4xf /3zh0e-mlm 4z r3: lght of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acy8g5yt) mla)(iira:o a jy/lq84hx .fts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400lhp00v49dko ,h pg2tu/mnc 0j N or a person weighing lcv/np2guojk0 4tpm 0,9d h0h600 N?

  A stone is thrown straight up. At thwsbu9)q7f pv /e top of its path, the net force acting on itwsbpf9q uv /)7 is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from2i6-5 h oor k2wes0;(yjenmjw the same height. Ignore air resistance. Compaj22eh - j;ns6w(kyor 0e5miwore their accelerations.

  A brick and a feather fall to the earth at their respe3k:90,wd iwlp0 wqps fctive terminal velocities. Which object experiences the s0dkif 90ww, 3pq w:plgreater force of air friction?

  An object of mass m is hanging by a string from,c a5 n.slqgq- the ceiling of an elevator. The elevator is moving up at constqs.a gqln,-5 cant speed. What is the tension in the string?

  An object of mass m is ha35tw0a qkcfsye cl* 1ig.l 8.ynging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. y18.secyfllwq3i.c 05 akg*tWhat is the tension in the string?

  The force that keeps you from sliding on an icy rp,ph s+yh+bfx3m7e: sidewalk is

  It's more difficult to start moving a heavzv. b 9jn 6m6yilsjqhv3c )0*o7 px(vjy carton from rest than it is to keep pushing it with constant veln)m 0i9jh*q ojx vl .b37(v6sjc6vpyz ocity, because

  A horizontal force accelerates a box froa lrq.a .axz-og3*:vs* g1b /qlmjly *m rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception a3* *xraol y/ .jbagv: *z.qs- gl1lmqthat the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocityve4to)dtqz : 3. Thus we can dedqt) 43ztvdoe:uce that

  A block of mass M slides down a frictionless plane inclh16jbnjgzail q32ny9 : , fo .s1.zcvoined at an angle q with the,os13z znoivf.2h:jl j16 by.acg9n q horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an anglrlubf s )q 9ki;-w 1yvw53av8ze q with the horizo;q 5l19wv3)yuis-v a 8frwkz bntal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down u 1ndpua-)iw):op e0sa frictionless plane inclined at an angle q with the horizontal. The gravitatie) p d1)naui:o-w us0ponal force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined,n:k-ek uc cs8b2ae+p plane that makes an ancp,c+8e: ka-2 kebunsgle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N*oo q k)qaq3l; force is applied to the object, and it accel;aoloq*) kq 3qerates 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/sz8 na(1jp+tl43x+ k di:u mjzev3aez:4a 2boj in 7.0 s. What is the average forward force etm3d ij 4+ 21zj e zauk 4zaloxnb:a(3:+v8jpon the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 sacpbn y:d9zs2j) ( vu8. What is the(8 9 pzja y)n:2cbsduv net force acting on the body?

  An antitank weapon fires a 3.00-kg rocketlkh 9vh9 ga80l cxsu;) which acquires a speed of 50.0 m/s after trave8;a s)gklhlu c hx990vling
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 y o7t bjq4 lnwebhbkm/.)1h9i 9ou push a 10-kg mass from rest,l/7nhe9 )i t4.b1 wbhj9 kqmob

  What is the mass of a person wwlngak433q -cho weighs 110 lb?

  What is the mass of an object thatbe8 ti:u9cr9 w weighs 250 N on the surface of the Earth where the accelebu9 tci9rw8e: ration 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 objs:1y(u +t4n h*mjb:,k )s()kdq yxq5 jgncithect on the surface of the Moon where the acceleration dueh(intq(kyd+)hsqjs4t:* cmj k1ug)b yn x, :5 to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object3is1sk u3v9l m4q7 dw9 0xpgl1 ldqmy; B weighs 40 N on the Moon. The Moon's gravity mklpgsqq9w 7i3;1lmdd9x4 y0l u 3sv 1is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of asna6j8f :rl.wsm0,0au 0.feyva l)bn 7e8 sju 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope a8. n7lf0jyl .:mfa uwna ,ees6)va8bujrs00s ccelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A f y-5w)levmol- fdxuyg)/a83g orce F acts on the stac fx5l8ey)lg-o3/d g)y -vu amwk, 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 stan,yfudb 1 gd-h7ds on a scale in an elevator. What will the scale be reading when the elevator is accelerating do g7dhbf ,1du-ywnward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. s o/a,1mfb(muIf the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleratiof,smu (1mo /abn of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If theg bqv9 .,ugl/o mass of the person is 60.0 kg and the elevator acc,lvo gqu./gb 9elerates 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. One force has a magnitude of 8.0 N ae fdi .t.rk/g0nd is directed due north. The second force toward te.d/tir f .k0ghe 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 of a truck. It is)yn j(:xus)a kk8(cq f7)d eoo held in place by metal brackets that ce(y7ckq x s (fanu o8j)okd):)an 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 rests on the flatbed of a truck. I f*dj0* iv;2h ue jfo3,ble4zyt 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 min2e3fhy jj4 bu*0oe ,*zlifdv; imum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-asp 16-vpggr-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleratiopgrgpv s 1--a6n of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machin4k)m v8h3thynh5/ .myl rq ,mse shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the m)mt.hl 3v ys/q hkmh5r4y m8n,ass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 10j+u ,c5s zkld s93vk*b )7vser0 N in) kvurc5e3*s7l+k9 bd,s sj vz 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 boutas w gyruj+ns 4 qzknr*i(.;pr/,)3oks 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 4q*apnruzu+nywt)r4 ;ki.s s , 3g jr/(0.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as showg xc+g i.: 1ey)p+s w3pz-:ic) pkemjun in Fig. 4-2. What are the tensions in th+c.x+ge3zpci:)k:si py-j 1)up e wm ge ropes?

  In Fig. 4-2, if the tensions in the rops +pj eh--egv*es are 50 N, what is the mass of the traffic pjev-*hs-e+glight?

  Two boxes of masses m and 2m are qcd a+ 4q*..8b*3r syyhsuyfssj/j (win contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive boxq .aj8f* + s/ u4y*dss q3(rybyhwscj.?

  Two boxes of masses m and 2m are in contact with each othcox, tsh2shy2x6n x.w sy-7v+er on a frictionless surface. (See Fig. 4-3.) What is the net force on the more ma7-yw,c+shn2s6. sxx xy ovht2ssive box?

  Two boxes of masses m and 2mc:c3*fi 4 txc:0wpcaf are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what ic t4 i 3xafcpcw:c0:*fs the tension in the connecting rope?

  Two boxes of masses m and 2m are; 3 3zwwn+kv5ddg dc x.ut4aw* connected by a rope. (See Fig. 4-4.) If the forward fu4 xn3wg dz.atv c ;+5wdw*3kdorce on the 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 0g ddlgt 5bq98as shown in Fig. 4-5. Bodb 8g 5gdq0lt9x I 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+11cj1a (l hgt-r-kf1tavkgb kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Whajbktgatlk (-ag-v hr+ 1111cft 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 wof+j;wi u;, fa oxdpt.;yo6hq-od are 0.50 and 0.+ ;o.a, t w- ufxjqidfpy;o6;h40,
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 dix l,f)gkla )e7rpl*3p rection. It slows and comes to a stop wixplkll*)a)er,gp 7 3 fth 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 ho uj/rj-jep;jz yeqnt+-d08oc73)ame.; m ex prizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleratna+ yjepm dxrjt-307e. jmej )ep8oz;-/u;q cion of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rq qvbit 8fb-0nfp7 lcbw7j;)s8 9lvp8ate 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 ini*y 5a9w8 jog/ kpdsp +),uvj:mdj5zmutial speed of 10 m/s. It slides 50 m on the ice beforewv jomu*g/zd)jaus d:+ppj58 59ky m, it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accidhq5tu q-, rb/qv6ubs7ent, police find skid marks 90.0 m long. They determine the coefficien5/76hustv-,b qburqqt of friction between 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 *s6 :ej (ug4nvt jrluu/*flk33m are stacked. (See Fig. 4-6.) The surface between the more massive bolj * ju uu*nsv4 r:l6fgke(t3/x 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 friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (Si iwou.c2r5vbjz247vk lu, ;y ee Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth azcryuv ilk 7,.u 2ib 5v4j2;ownd 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 plane is inclined at an a,v n i,mo- yy6cdifq;1ngle of n fi mov,;c,1y dq-i6y$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hp3sohr* ;plc *oohv e1t9m5 8mill 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 an0z0/0lkqxko rgle 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 fg/.-75ml: v )pnvpggd+z xtpplane 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 an inclined plane, at a consta6iae 4h v4iv1 l5np nhs1gvxz,1mj m38nt velocity of 6.1xeh4hvim, vzl1 p3j6nva5gs 8 41nmi0 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 down a r)ea zbl h;20b +1hjzjgough $37^{\circ}$ 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 p. )iiiiy7z3 ya 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 alon 5s2xek iht5zgrm.5d5 g a rough surface. The cable attached to thezmhx.ds55t 25 kigr5 e 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 releas;hfb gufdy+k) le.p:1ed from rest on a rough inclined plane tilted at an angle ofd+plhf . keb )guy:1;f $33.5^{\circ}$ 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 inclinei )1mcif4*i xo 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 the object and xm)ic4*foii1 the plane?