Which of Newton's laws best explains why motoris0 dclx3* 6hj)pmut.s5ljbc i:ts should buckle-up?

  When you sit on a chair, : iqmc6-h22x3kv igd svr:g7ta 85slr the resultant force on you is

  In the absence of an external force, a movin;hefrlm11 pj ubt,1v .3jj 4tm1 fmug8g object will

  When the rocket engines on the starship NO-a7i,h/udo8e.sy. w yuPAIN-NO-GAIN are suddenly turned off, while traveling in em.y d7huou. i,s/ea 8wypty space, the starship will

  A rocket moves through empty space in a straight lt+ts,,htagb 6ef 5bo,z3a/bbine 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 hb+ ,og ,/5b3abztb6t ,aeftsorder to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fa ( jpt; knpmfhll)-jd stj e(k.m+1o17ll forward. You l)1je( (71j hld +.fk- jsomnm;pkpttcan imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenlyr4 e )s0ofs f-9iir 1x(etwnl0 fall forward as the bus comes to an immediate stop. What force caused you to falrr fi91e-ws l4iex0tf(so 0n )l forward?

  A constant net force acts on an objgc tq ( *2qpm4wx+slq)ect. Describe the motion of the object.

  The acceleration of an object is inversely prqa) lz)dm 8wdc-6o na+oportional to

  A net force F accelerates dj mm 1;y)lnb0a mass m with an acceleration a. If the same net force is applied to mass 2m, then the a)d jy;mnmb 0l1cceleration will be

  A net force F acts on a mass m and produceao zlz4dkd9o;3, ko* bs an acceleration a. What acceleration results zkad9 ,*;lzbodo3k 4oif a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will xla+o4j)wt ww8*3 e edfly away. This i)e+*oa dwx l3twj 84ews an illustration of

  Two cars collide head-on. At every moment during the collisl 6n19j;c ;hrhw+ xjfoion, the magnitude of the force the first car exerts on the second is exactly equal to the magnitud rjh c9hx1 +w;6nljo;fe 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 which the object exerts obnp*;wnlbq (igp :(4z n you will(ig:;pnb *(zq nb4wlp

  Action-reaction force2cgtu pyw /mz. 7ie,g1s

  Action-reaction forcxwg41h- j*ij5 caeh .zes are

  A 20-ton truck collides with a 1500-lb car and causes a xo5g8yx-os f/+tn 0hulot of damage to the car. Since a l h+sxoyfg08/n xot5- uot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wit.zoski; h7w j;1zzl,5vw ) xwkh force mg, which we will call the action force. What is the reactio 7vzzs;w;)ijw,o5kh.z1klx w n force?

  A child's toy is suspended from the ceiling by means of a string. The Ek + r//g7m5q zhvec4cfe9r2h qarth pulls downwakmr+eqq hz5/cfrv/24 h97ec grd on the 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 2yp/3u ow x5n:wpws2apitched to you with a 1500-N instantaneous force. The ball hits the:w2yw asn5p /3uxwo p2 bat with an instantaneous force, whose magnitude is

State Newton's three la ntl d.bsnna(1 //z uj 0l7(tb+ffkth4r-f /dqws.

  Mass and weight

  The acceleration due to gravity is,t lf5,)qcvig lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on thef)tvl g,c, 5iq Moon's surface, compared to Earth?

  An example of a force which actsz+g;z wrfl.q + at a distance is

  Who has a greater weight 58-uc ts0.1lpa/o/orulb i3z2l wtvw to mass ratio, a person weighing 400 N or a person weighing 1 vt0tz l 5uo aiw-lo.blc uw2rp3/8s/600 N?

  A stone is thrown straight up. At the top of its pvy(si1g6m,zc ath, the net force acting on it ism y is1c,vz(6g

  A 20-N weight and a 5.0-N weight are dropped sioc4dh: hrinodu n t+b/9y1 ;02vcc/yomultaneously from the same height. Ignore air resistan+/0h9oo/rv c coy:2ibn yuh1 d4ct ;dnce. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velo r0ls( ca /ya8bo7gb ;+vzw.vb cf4so)cities. Which object experiences the greater force of air frictionbyv);.a+wbbfos(v/o78 0 gsz cc4l a r?

  An object of mass m is hanging by a string from the ceili -lyowokvv cn**yawg .jc4x6 f 7o)2(fng of an elevator. The elevator is moving up at constant speed. What is the tension in the c.6 * gnfxcovy *)7f vl2wyao4(kjow-string?

  An object of mass m is hanging by a string from the ceiil:/- 7-h(ljvf2 8 teer ejqceling of an elevator. The elevator is moving upwae:8h-ejftll e- jreq2c /7i(vrd, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on anvet) /ol,;hjfrwc .7 h icy sidewalk is

  It's more difficult (mf:.p nyf;9;u xrpbm mdf32y to start moving a heavy carton from rest than it is to keep pushing it with coxymn;rmd fb(9u;fmpy f.2 3p:nstant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (f rc6m5 s7*8naou2vkntriction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is d 8m a6* o25nrscuktv7noubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constan83 kx;qwqc-hq8+ nns st velocity. Thus we can ded qh-+snqq8 wk; sx38cnuce that

  A block of mass M slides down 1bxm 5ju .8wtna frictionless plane inclined at an angle q with the horizontal. The normal reaction force exew5mx 8.jb1t unrted by the plane on the block is

  A block of mass M slides down a frictionless plane i0rfcyq (-iq n 1zbtrnwg88*7k hk3m1jnclined at an angle q with the horizontal. The normal reaction force exerted 8nqt0 g y8rjnh37kzwc* 1-1f(rbiqm kby the plane on the block is directed

  A block of mass M sliddm0-0ei* hlcfes down a frictionless plane inclined at an angle q with the horizo-l me00icf*h dntal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined ps afng17 wds:ry(- f) ddpxrbqx* 3ba891,oyq lane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being release)sxg, bwron : fa7b q18(d1q 9addyyf*xp-rs 3d.

  An object sits on a frictionless surface. A 16-N forc,,y ( vap jz;u4w5cjxye is applied to the object, and it accecy j,;5 p ,(v4wzjxyualerates 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 kj 2..,nscxc fm/s in 7.0 s. What is the average forward force on the ca. .nf kx2j,sccr?

  Starting from rest, a 4.0-kg body reacon:a f 7)5v5s.tbk2c o k(j.qoyv ca1ohes a speed of 8.0 m/s in 2.0 s. What is the net foaf(nv15s7q.c)2otkcbk:ooa.o jy v5rce acting on the body?

  An antitank weapon fires a 0:.*0e uo6kdr+f 6mgn:gp0djjpm ndm 3.00-kg rocket which acquires a speed of 50.0 m/s after travelijof0k: d.u p:rnpmm66 m+ d00ejnd*ggng
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 yojrkkpr 5s/k co9onc03 k 4:/xgc oy3.xu push a 10-kg mass from reskrc59 kjk3n/c o.r/gxpo3 syk4c0:o xt,

  What is the mass of a person who weighs 110 lb ql 8oyzo7aah:x f *p*q9,:tql?

  What is the mass of an object that weighs 250 N on the surface of the Earth z* tqlb9do)0q7kec-wav fc *tx:d3t+where the acceleration dueb7t*kdt* fv3cq - o:c+qe09axdwlt )z to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth.b/tnklwgm+a7a,57 ph 1vqi 8+e4 .gwt qtw d4a What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 wgdq5mt/a7a8w1kv+n tigl b,4 awtpeqh +.74of that on the Earth?

  Object A weighs 40 N on Earth, and objeawnr(p9i; b5 1m4 ukvnct B weighs 40 N on the Moon. The Moon's gravity is 4mw 9bruik15(va ;npn one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling9myg2 ja9 2edt0jmw4 6u(i2d hqaydj- on opposite ends of a 5.0-kg rope. Sue pulls with a 9e ymum6d-j2 yd(j0 j2aqtwh492g adi 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionl nrddch 6.9jw- +2bdqhess surface. A force F acts on the stack, w9 . hnj2 bd6hqc+d-rdand 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 stands on a scale in an elevatorjq c4a3dy6- ed. What will the scale be reading when the elev-dc 3ey4adqj 6ator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of taxu mrx.;mi*y:. 8fi lhe person is 60.0 kg aix*l. f8umxr ;aiy .:mnd the elevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the ma+t0 yct ga .-.1q:skuiqh )zsqss of the person is 60.0 kg and the elevator accelerates + ..10q :gqauk)c-ztytsishq upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces5j u mt2mqx 58bzzrf0b(5ob.l act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force towarfb5ro85lzm x. (zjbt0b5qum 2d 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 of a truck. It is ) g7rb,d;abql,zxei - held in place by metal bracb7;ixzbq -ga dle),r,kets 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 into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. up /cfw97igjgk/ 1j)/f jy)b ;(kfmulIt is held in place by metal brackets that can exert a maximum horizontal force of 9000 w/ij fb1 );gkuj)9l(fck u/ypm/f7j gN. 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 = 0.60 o;fwsp sii 4g532ja/tkg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass 4 g3;isao /wf 25jistpof the pulley.)

  In the Atwood machine showne:tz cj5m ada ;)i,jh*vjq1q 3 in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is theq5;3hcadam)i ,zj 1tq *j ej:v tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a yu9xw -tbxe 0*( 8sa0kf0ys 4a.qzx nmforce of 100 N in(ky4a- xzbya0xq fxmtsw09e* 8un .s0 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 horizo5r0 afjze 07vp 4z,uipntal 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, 0izapu0 efpv54jz7 ,rwhat is the normal force on the box?

  A traffic light of weight 100 N is supported by two ro bb) p)xp :8+ajrfv 0yg3o1sswpes as shown in Fig. 4-2. What are the tensions in the 1bw+y)o ss:0arp 3p v )jbgx8fropes?

  In Fig. 4-2, if the tensions in the ropes a31+( rjd-ojnqzbadb 5re 50 N, what is the mass of the traffojd+d(rn a 315-b bjzqic light?

  Two boxes of masses m and 2m are in contact with each other on a fwnp8 4.razqs -afa +fdy /h5dvw45 4nmrictionless surface. (See Fig. 4-3.) What is the acceleration of5aav445fddrw+ hyf ./ 4w mnsz-a8 qpn the more massive box?

  Two boxes of masses m and 2m n6y.y1 qdqla q* bz-1jare in contact with each other on a frictionless surface. (See Fig. 4-3.)1 *1- bqqqna.dlz6yy j What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope.n;pi 5/7y fbb rc*cu.f (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the con7pci.r/*c nf u;b ybf5necting rope?

  Two boxes of masses m and 2m are connected by a06 9m.msc3,z8tz+w yrjmttai rope. (See Fig. 4-4.) If the forward forcw 83m.rtyitm 9 6zct,+s0jzm ae 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 in Fig. 4-5. k 82+0r5le2wxf6fdf8t1j po tiry6xe Box I o58t rjet pf+i0ff8 xl2eo1w2ry kdx66f 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 anrffm *xl 15,0 u/jmj2lq8gcykjsx8l*d kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectiv, /* jxmlmkl sj cqf81lfujr8 *gx52y0ely. 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 f-xgs6l47mbx +x bcpl +or plastic on wood are 0.50 and 0.406mbl7c- gpb4x+ +xslx,
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 6u(srg ra7 gp1+x direction. It slows and comes to a stop w6 auggr s(r17pith 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 horksj/.,tb 6qgpa jt -a9izontal surface is pulled by a 5.0-N force. A 3.0-N friction force r/a -aj g,k9pjqb6t ts.etards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from y -admn26fl v8rest, 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 pug +js/ 2cw8x ilk11y4sh 4egitck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kineticti4 +giw 8 j ksyl1ex1h2g4/sc friction between the puck and the ice?

  During the investigation of a traffic accident, pox/n((pl 8eytnu5 w izr l(j6p7lice 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 prevailing conditions. Estimate the speed of 8i(7tpn/5n6xw zlr up(y le(jthe car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surf tdqv*p:59kki ace between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less m t9k ipvd*:qk5assive 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 mgo z tnv0pd q(:fp97mah 6q1 .,uu+rd3m are stacked. (See Fig. 4-6.) 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, wd0 q7mquf, o mrpgdzt6:n +va.(9u hp1hat is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane eua .i+um4 4z/prchx *is inclined at an anglei u/z.c 4a x4erp*+muh of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes qw-jd8;frq. qmrdg3 b(hb8f8an 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 pldimdzf0o785ch ok8l9 ane 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 plane tiltemb1yt. pq/7glro /uw6i4p 4 xyd 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 downy vyip q6n;4f2.abem 9 an inclined plane, at a constant velocity of 6n.v4fm yep ya296b; iq.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 dghd1pin5yh 6wq.:z 7gown 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 d5bjz7-d, rx(9lan z baown 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/u j6p4 7*75w0tgh cnt:a k vbqlx7fycng a rough surface. The cable attached to wvatjb/6h:4*ln7xuqtp5kcf y7c g7 0 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 inclined9 xn ,d71b. ux3tvwbpe plane tilted at an angle of17n3dbwxxe.u v,t b9p $33.5^{\circ}$ 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. Thecojh8( .(rruj angle of incline is gradually increased until the object begins to slide. The angle8rjcu(orj .h( at which this occurs is q. What is the coefficient of static friction between the object and the plane?