Which of Newton's laws bes)d cz5wybsc,b1new 8)5a: mvk 0ynm+60dbyr kt explains why motorists should buckle-up?

  When you sit on a chair, the resultant fln( ,1d 90 yf0.wgndlj rhrxvu,p /v.qorce on you is

  In the absence of an external force, a moving object wif9-3u ejhps2tll

  When the rocket engines on the w; 9q y ovwi3z4rou+)jstarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty sp4)9 wowj orqv3 z+y;iuace, the starship will

  A rocket moves through empty space in a straight line with const+:)jts kpc049ww cz d)ta39t3 ggeyriant speed. It is far from the gravitational effect of any3rt: 9g9+wz cj0wad)ik 43ey)p sttgc 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, and you sud lcq:xq )eu16lp:rxz5 x+hc*tdenly fall forward. You can imply from this that the*5)x+upzc1 t::lxe clx rqqh6 bus's

  You are standing in a moving bus, facing forward, and you,, iq55pb qpppg*vmy1 suddenly fall forward avbip p,*gm1q q 55,pyps the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of 7q*7et-7n(o rieyv x q; quw5go*clv/the object.

  The acceleration of an object is inversely proportional hdx1( qibm*u5;t/ c+ xgvgw7kto

  A net force F accelerates a mass m with an accelerati hbue741- (lr,ymrya)fmb w ,ron a. If the same net force is applied to mass 2m, then the acce-ay1bmyr 7m e)bu4r ,(fh,wlr leration will be

  A net force F acts on a mass m and produces an acceleration a. Wht 897he/kmf yf *0x3-x tegew/mdd. mxat acceleration results if a net force 2F acts on mass 4m/emx/xwm93m hk x td0 .eff7tgd-e 8*y?

  If you blow up a balloon, andwp+)3 g-z8q+t xbyap v then release it, the balloon will fly away. This is an illustay+t)v-pgxb3 +q8wz p ration of

  Two cars collide head-on. At every* gizsb37mlet lp: )p4(8 4.y bvcpaii moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the sec b3syia gmvi 8iz.p tp4(el4cl ):p*7bond car exerts on the first. This is an example of

  If you exert a force F on an object, the force which tojhf fbh90vvl y1;x-h ,tt)h+he object exerts on you willt1jv); htlyofhfhb, +9x0 -h v

  Action-reaction forcehq 4ns11* feznd *zg*fs

  Action-reaction forces w+/j-5isl:di7 o iv -b+asdszare

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage (79s p08lxi1 n0ya2mibmufeax+ m egv,y .r8 wto the car. Since a lot of damage is do0+n ie(bgx 9x fa uamlpm1 .28myev7wr,8y i0sne on the car

  An object of mass m sits on a flat table. u8ogqtzu-jzkww;+id 8d 4) v4The Earth pulls on this object with forj;wo8+g44-u vdz ztukdw 8)i qce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. clp h6(t(qx ;dn-drw t(6: bu dg-d5arThe Earth pulls downward on the toy with its weight force of 8.0 N. 6cpr:d(5d u(qng( 6w hxt-al-bddrt ; If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a ahv1k sbyd.gv- m*s;61500-N instantaneous force. The ball hits the bat with an ;vky6 bmssa1.gh* v- dinstantaneous force, whose magnitude is

State Newton's three laws.hj8r+t3,oy i g

  Mass and weight

  The acceleration due to gravity is lowed(ysb/xur 9ba)*u( ,c *bwrbe r on the Moon than on Earth. Which of the following is true/*ur xae(dbbsr,c() 9 *bwuby about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which actsg7yh3n 5i8hppatu6 - a at a distance is

  Who has a greater weight to mass ratio, a person ga9 1dyp upl8y7*y t1jweighing 400 N or a person weighing 600 Ng p t8pua1lyjd*1yy9 7?

  A stone is thrown st,5ijwzh;e)g21q3w kp1csu0 b b:g llglv(v 4 iraight up. At the top of its path, the net force acting on itv5l 2zg ()0w: 1kbslbgh;ile3qp41 ugj,ivwc is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same d m s*6marx/htd+fjn468g-+ ut*wdpv height. Ignore air resistance. Compare their acceleratf+udr*-*td6n t p mx6svhmdjw+8 /4agions.

  A brick and a feather fall to the earth at their respect xp*x p qcj.9xg1ff74oive terminal velocities. Which obj9o jpp*x4q f1.xg cfx7ect experiences the greater force of air friction?

  An object of mass m e1pi( mfl 9xr, x0ptr3is hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed epft9irmxp10l (r3,x . What is the tension in the string?

  An object of mass m is hanging by aewfufb fa 29y)9 f(he-u/1twt string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the struuft/ey w2te(1h) 9ff- 9fwb aing?

  The force that keeps you from sliding on an icy sidewalk isbt7uj,ml.g j 6

  It's more difficult to sta2f8j thkb4our 9la ,-brt moving a heavy carton from rest than it is to keep pushing it with constant velocittj8ba r9fuh2l ,4o-k by, because

  A horizontal force accelerates a box from ;1:q du x+fy8sv 1p7np3id 7j1cw rolzrest across a horizontal surface (friction is pres7r 1 fiwu;xcnql1s8dp+y71j: p o 3vdzent) 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 l ixd nw:q6r:1(w jtv,down an inclined ramp at constant velocity. Thus we can dedxni,j w:1qv6(ldt w :ruce that

  A block of mass M slides down a fpe9df::mq9lbs,( g lqrictionless plane inclined at an angle q with the horizontal. The normal reaction force e9: pm ,qsf:lb qlgd9(exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclinedam+. a-l.lfp o at an angle q with the horizontal. The normal reaction force exerted by the plane on the blfmpa-.ll.o+a ock is directed

  A block of mass M slides down a frictionless plane invg 3*phlz(s y4 ca0//+ aaz9ehqqdx6r clined at an angle q with the horizontal. The gravitationya+q as /vhaqhzplc63e9 rdxg*40z(/al force is directed

  Two toy cars (16 kg and 2.0 kg) are released simulta -mk -01 gki(sgwm5lv/msgin8neously on an inclined plane that makes an a( g-80g51g m-iislwvsm n mk/kngle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surfa -gct :3fnzdl(ce. A 16-N force is applied to the object, and it a :cfgtzn(d3-l ccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass ;) 6bq dd.m sgu,rqe vnz.l5*y1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the ,rqeygsqd.v.un*56bdm z)l ; average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What a.d rxip5m0r**whaf. is the net force a5rawphr mf d..**ix a0cting on the body?

  An antitank weapon fires a5uauvycjh-rw x 3gb7w9-521y2gfb yg 3.00-kg rocket which acquires a speed of 50.0 m/s after 2y9u5 g2hvauw1bg x5-cgr-yjyf7b w 3traveling
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 you puscvmi.a(hl4r, h a 10-kg mass from rest,vhca l.r4 m(i,

  What is the mass of a person1o0o wlfnfh l8v0()a d who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of thrfti62z6 9bqf biw+t*e Earth where t2q it bf9ibz+tfw*6 6rhe acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg ow ub62u: c6zd1 fes63rpf hos wk:3,zan the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 6r:1zz3ufk s3c2w:hdfoapu6 6 w ,bse1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The M +-qe(j-z ooon0svs)st8 ;vgroon's gravity is one si n+s v)(oosvogqe08rts z--j;xth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a ;e*3vs ptwb0 w5.0-kg rope. Sue pulls with a 15-N fove *;3w b0tswprce. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on4eo( )plm 6nai a level frictionless surface. A force F acts on the sta)aoen6p (4l mick, 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 stare;,hfe/h0vfv) zjl6 g alt,xr)hp)m ;(.vcn nds on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwar earcp)6ht r v/j)v.)xlg;e, ;z(fnm hl0vh,fd at $4.00 \; m/s^2$?

  A person on a scale rides in an elevas0dozqtttw- -g/05 lztor. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of tsq5w/ 0dtgo lt0z-z-$4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the massijw4xt ) oi)ts8o4c g8 of the person is 60.0 kg and the elevatoscxioo)4 4ti)gtw88j r accelerates 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 Nt w0ql;.p6b4 lcfxu/n and is directed due north. The second force toward the east has a magnitud/n lc ltqp06.4uwx;bfe of 6.0 N. What is the acceleration of the mass?

  An object of mass 60o+tq54p+hrt p00 kg rests 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 trucko5pqt+4t+hr p 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 zlc ,ag o1s.c.+yrxk s/n, p7sthe 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 i+lns.as cy.1zxrs,/k p, 7 cgos 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.i4c-w,/ed* uon 4gsk8ip d1hj60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of thesg,*1 4h84dde ipo/ -jw kcinu pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =v 0gcy j (w w scy5:jh80n1;pspd;jfa( 0.40 kg, what is the tension;:g;cjs10p ys aw jc w fv(hn(08dyj5p in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of bo.nrlq1 fs)k w /x2/uuwoks on a smooth horizontal floor with a force of 100 N inwk nlf /2u/xu r1sq)w. 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 books on a smooth hnu*q unpr (c*z o69t0borizontal 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 n* pn0ouq*6z rt9u (cbis the normal force on the box?

  A traffic light of wxqa,bh.m- j.-qgh (kieight 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in hja (igkq hb ,m.-.qx-the ropes?

  In Fig. 4-2, if the tensions inyc;n9i)yi4rkj ua+8u v0 if u/ the ropes are 50 N, what is the mass of the traffic lightyy+i 8ucjra v)4 0ni/ ;9ufiuk?

  Two boxes of masses m bgvl(9lln *7cm gkn;5and 2m are in contact with each other on a frictionless surface. (See *57nkg( ll l9 g;bncvmFig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionmqd6,p( b6yde0hi+ deless su, ipme0e66hq+dy d(db rface. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) I4a.g6ohxqg5 akg(5 wvf the forward force on the more massive box is F, what is the tension in the ca 6vxkog(wgh45 .ga q5onnecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Figgdul bo48 al3*. 4-4.) If the f8llu ad *bg43oorward force 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 as shown idli4 h -5*3 0nxqxvrvxn Fig. 4-5. Box I ofhqd5 3xx 4vvrx0 nli-* 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 kineti0 o(e3ocnaf; kc 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 30(ok;aconfe applied to the box?

  The coefficients of static::wfau s4*iro m;n m9dc39qai and kinetic frictions for plastic on wood are 0.50 and 0.404cawr;f : m*di9n3iqu9 o:ams ,
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 direction. Il2 c ,edm)opljt*i:9 wt slows and comes to a stop with a constant acceleratij,:*p eolc9l2m d)tiw on 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 horcjpcmbb7h32 ile, +ega9q 9q-izontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of tha-qb 9cm 7 iqle2jb gpc93e,+he object?

  A horizontal force of 5.0 N accelerafmf.3x 1uj2mvyh0it i mc+2 *qiu1ycg. mjz/ 0tes 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 giebsz(+voq(mz 8:b q4gven an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the pmgeq +bz:q zvso 4b(8(uck and the ice?

  During the investiga52g n- xc;xtev:*hrm- e 2wt).bavykt tion of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient ofae*ywetx- 2;h) 5v -mgt:ctnkb2 xv. r 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 ahp tk9;ur oyfk ndmkhw 89+4bew39k;6nd 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and th99;ouhw8f k9+bk dw;pe n t6rm4h3kkye 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. (See Fig. 4-6.) The surface ic)p(j u 3axypcbe92. between the more massive box and the horizontal surface is smooth and t3 e (2u9y .ca)bpxpcijhe 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 1(x jf90j 6estb5 xeg./fdy ubinclined at an angle b/ 15jde xfxg jsy9e(tf.06ubof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hiho2.x;2 h- st/e:gxz tcy) +k6tf bsoall 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 sm 49s5ni 1x j.q0ox**lhnfvmlnooth inclined 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 xh4;wwlr1p e0n,wa+9thbs 8b inclined 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 slides directl*+okukmz- 3+x nofc,dnfc;j b9bwdq je /u:7 :y down an inclined plane, at a constant velocity of 6.nx + ,/fwu3dn9czjd b fc-e;omkjuoqb+*7k: :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 slidfwbt b7:.nij zq0d-;zes 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 sli+1cj.l syi7ra0 :ygwldes 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 lo0; d gojlgexc m3r6vexn8(*7 rg weighing 500 N along a rough surface. The cable attached to the log makes an angle rx8* jmel ogg63(x r 07;vncdeof $30.0^{\circ}$ 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 at an ayt/ 4f 8fut1nanglet/u ytf8af1n4 of $33.5^{\circ}$ 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 incline is graduall,tb z1jvbx-lytc-6d-y increased until the object begins to slide. The angle at which this occxltd-z j6b-yb,ct - v1urs is q. What is the coefficient of static friction between the object and the plane?