Which of Newton's la5 rzzto03ja2606 dw l1lgqfkvws best explains why motorists should buckle-up?

  When you sit on a chair, the ro.9ofm dyv+wp * 6k;l5dn*symesultant force on you is

  In the absence of an external force, a mgg 62 86h:m0qafq bepboving object will

  When the rocket engines on the starship NO-PAIN-NO-G+bz:xcsbt) *g81l qgrAIN are suddenly turned off, while tralb t* sq8g+r )g1:zxcbveling in empty space, the starship will

  A rocket moves through empty space in a straigvc66t +0 fnxtsy(y/z wht 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 sus ty6+t/ y06fcwx(sznvtain its motion is

  You are standing in a moving bus, facing forward, and yo*n ng u5wi2m2 9qigw5iu suddenly fall forward. You can implyuimi ng5n9iw25 g*q 2w from this that the bus's

  You are standing in a moving vkmho,0+p --1hzrbgw6.v y q/qa bao6tr17 c kbus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forw+-p-0 hay gv.1 qk6v1r67b,wqo/c boh tamk rzard?

  A constant net force acts on an object. Descri; )d.ts5vjqr87hth*s 9x)s8iugluq1 hp sr4 nbe the motion of the object.

  The acceleration of an objectu2 mbzn2pcfqa(-u /1 r is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If (d edvju)c6uh+salg8-fk c2imz8n -o8z dv(:the same net forckgzvcv8n i6(cj- +ul:osde 8hdz8ufd2 (am)-e is applied to mass 2m, then the acceleration will be

  A net force F acts on ax4p7vnc6j iw )nq w)n/ mass m and produces an acceleration a. What acceleration results if a netn/jni qxn6 )4p 7wvcw) force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wws81mwd:n -ra y3xne vjv(7* iill fly away. This is an illustratii:xasjwv 81w*-rymdvn e n( 37on of

  Two cars collide head-on. At every moment during th8hnl/jubvj ( 3e collision, the magnitude of the force th(lnu /jhjv3b8e first car exerts on the second is exactly equal 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 object, the force which the object exerts .cha-5d ;nvadfit a7 /on you will/.a7cdai; t a-n hdfv5

  Action-reaction forc;vz1j lavh;c7es

  Action-reaction forc h mn/y7bdp1z;jj (o5fh18enh es are

  A 20-ton truck collides with a 1500-lb car and causes a gfea4/b atqp) xc6xy,i 9, dh1(m+;fbj8q qtp lot of damage to the car. Since a lot oft p1mqx b ,(e8q)ata+,dyp69g x f4;jifh/qcb damage is done on the car

  An object of mass m sits on a flat tablwt 3zzt7n6 lwb9tx8, we. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?bw7nw9t3t,8x zwtz6l

  A child's toy is suspended from th) zel.uuzswn72 mvem7x-(4sdi. b2 qne 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 "reactionzne uz7ieb2su 72 slvqm .x(4m.-)wdn force"?

  Your bat hits the ball pitched to you with a/y6abyf8 h vjm+;ncu.z4b 3 vn 1500-N instantaneous force. The ball hits the bat with an instantaneous force,cz;3 ay/ uhnfm8b jvn.y+v 4b6 whose magnitude is

State Newton's three a lku;n (4x6pvlaws.

  Mass and weight

  The acceleration due to gravity is lowerkga j.r ;w9f dm(o4a;n on the Moon than on Earth. Which of the following i(f a.wkojga9d;; 4 mrns true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whidy a9n,ksc xrqrt8j,x6bv,/ 4ch acts at a distance is

  Who has a greater weight to mass ratio, a person q .ewgty a;5x3weighing 400 N or a person weighing gtwyeq ;xa.53600 N?

  A stone is thrown straight up. At the top of its path, the net force acub*tzko,9x/qtj p 3f2ting on it isz2,b jo9f3xu* tk/tqp

  A 20-N weight and a 5.0-xe esq4wv, ;5eor71 dsN weight are dropped simultaneously from the same height. Ignore air resistance. Compwds veeqs74ox ,5 1e;rare their accelerations.

  A brick and a feather fall to ts houtcd3k:n.rsv1- +he earth at their respective terminal velocities. Whic3khcv srs.unto+- 1:dh object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Thy.9 mqg3d:w *oac2dbue elevator is moving up at constant speed. What is the tension ia.3d cq:ydmu2b *9gow n the string?

  An object of mass m is hanging by a string from the n6)ur(3lt xp)d2v /btw4 cid8 srmpn0 ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the nw uld/4vxmb6p8 t2t n) ()s0ri3dcpr string?

  The force that keeps you from sliding on an ic lp u stu k00uk+4u,a35 uj3wht(uiv2ky sidewalk is

  It's more difficult to start moving ndvsv /8p;vd:t96u eg a heavy carton from rest than it is to keep pushing it with constant velocity, becauv8 es/t 6dnvpd;v9u:g se

  A horizontal force accelerates a box from rest across a horizontal surface (fri( v1cp1)ercgn2+1pn4hayq g nhh 958lfcx qd.ction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the ho cyr9c1n 1 2 +)nh4hnqpcle1(8g ha .5qpfxvgdrizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined s8yjot;l c06gp5p0 1ndrj td3ramp at constant velocity. Thus we can r 05 1tppjnyodjcl6 83g;ds0tdeduce that

  A block of mass M slides down a frictionless plane inclined at an angle q wivmluurwu d ; :k ,t:/etew0l23th the horizontal. The normal reaction force exerted by the plane on t0 wl meukt lv:re;u:,2twu/3dhe block is

  A block of mass M slides down a frictionless plane inclined at an angle o6v/fxydh3crg .4.u jq with the horizontal. The normal reaction force exerted by the plane on the .uy v 4o6/jr.dghf 3cxblock is directed

  A block of mass M slides down a frictionless plane i:i5o i(;dyr7 rbgymun0wby l438h+do o+dh0y nclined at an angle q with the hoi7om3; bo0 8wbul5r:ihd o4+h nydy0+g dr(yyrizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneousl,2newb3:n0(f zk gg hp3k i6yky on an inclined plane that makesykkh3g 0(:n iewgfb2p6k,3 zn an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frict2 1tjadq)xxr+a/7fp gum,hz7kf j06j ionless surface. A 16-N force is applied to the object, and it accelerates ath q7ja21+md7,k6 uf jxrzt) j fx0/gpa $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest t8 q*ur9v- 3sp7kz.qv u sca3qto 27 m/s in 7.0 s. What is the average forward forcuksq*vz-r789qtc q33pu a. vse on the car?

  Starting from rest, a 4.0-kg body reaches a sp,pxfe:8i(8tjm mlobx 7t v+9j /y7mx beed of 8.0 m/s in 2.0 s. What is the net forti/(bmjl e7v78p+ 9xtom f myxbx8j:,ce acting on the body?

  An antitank weapon fires a 3.00-kg rocketo j:4wne fap-01bxfn 0a8s 9zc which acquires a speed of 50.0 m/s after travelioes b9f14a a 0w:8p0nnx-zj fcng
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 jdumo5p40i o3ga 6mf /force that you push a 10-kg mass from rest,3/opd uafomi5j64 m0g

  What is the mass of a person who weighs 110 lbz yoj6b gqz5ttcnt00t;1 j9) n?

  What is the mass of an object that weighs 250 el4) g6a j+wlqN on the surface of the Earth whereq6gl wjl 4)e+a the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg ,sc9 q:cg/a k3atyufy+s9ri( p;h( ipon the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only si;,( aq9hp /(y u kc+3ta:ys9f pircg1/6 of that on the Earth?

  Object A weighs 40 N on Eartkyv jirvp8fk/14)w5yh, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the object 45/8v)1jpkvf iyrwyk s.

  Sue and Sean are having 9yjxarz i8,be(*i5 r54qj juwa tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's fo9* jyqeiw5 5,( bzjuxir8j4rarce if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts kw1sz/s 5srjqqkr6kxx*x908u(0tr uon the stac 8 skuzj rk5k0stwq1(xr/ 0q6xurs9*xk, 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 stand wu+bp19m3biws on a scale in an elevator. What will the scale be r u 3ww91bm+pibeading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the m41pjckr ) d8f)j bis afcx66z)ass of the person is 60.0 kg and the elevator accelerates downward with an accelerations18) f)di4rbfjzxa cc6)6k jp of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the persm s rri ij:e)/ .upny9hf68 p4nes*u7hon is 60.0 kg and the elevator accelerates upward with an acce46fnjm s7/irn8up9e :h iy.sreh*u p)leration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass.dg,h q3eyw(vn3txv389y , shx One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude ny8w q 3vhhs,3y, v3 te(9xdgxof 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of 4 9g(q swob9aawait/6a 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 is the minimum stopping distance if the load is not to slide forward 49gs ta( oqba6wwia9/into the cab?

  An object of mass 6000 kg re)e9:i -6 g)pw /hcbcb8eu ll uln/ qtsk4g0af.sts on the flatbed of a truck. It is held in place by m ap 6tk4hbugeg. 9s-u cfc8enqll lw)b0 /:i/)etal brackets that can 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, ifzc eqnrt-a8./ m.e. )w: kvofz M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass oftav wzfz-8:/.cq) k en.m re.o the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what*vl;c:/: jcjapi*hexa, v2 jx is the tension in the string? (Ignore friction a/ avcc2:p;hvi * jxa:jjx,le*nd the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a6t7t 7mm )( nwcjqi)ncmv81em force of 100 Ncm)j8n1m ew6tc77 v)t m (qimn in 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 s( kix86 jk/n vq,6iaq+st5ou omooth horizontal floor with a force of 100 Nv nq o6+u5txai6 j8,k q(so/ik 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 force on the box?

  A traffic light of weigh/l .cpu5vmv 7yt 100 N is supported by two ropes as shown in Fig. 4-2. Whatml/yu.c pv7v5 are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the l*/8vmh i*v(/tt nigomass of the traffic lt8 vtn(h/i/i**mv olg ight?

  Two boxes of masses m and 2m are cy:*v jnwno8:p/gg3/psr m0e//mqas in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more m mn/mo/ n/cs :/*v0gsepp:rjaw8gqy 3assive box?

  Two boxes of masses m and 2m are in contact with each other on a frixzkgq85l 352v)juar zctionless surface. (See Fig. 4-ajv)q58ux lz3kz g2 r53.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a r*od.h,ae k*g27fc0 d8grn es eope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecks27edg * .0ed *eg n,ha8corfting rope?

  Two boxes of masses m and 2m are connected by a k cyoi.(j01h srope. (See Fig. 4-4.) If the forward force on the more hksi yj(.0o c1massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running rsn990duj4f* dfya7hover a pulley as shown in Fig. 4-5. Box I of masyu7sdd9a *r49fj nfh0s
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 between a 3v2r6yt3 2tj6juydw5r /cy* ue .0-kg box and a desk */eudvr5y2tutwyj y6r3c26jare 0.40 and 0.30, respectively. 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 on woo:w v qxo39mce:o)kiu .:m/qhid are 0.50 and 0.40/.q)i qckuemoh: x9m:: i o3vw,
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 inxs. wn.idh u3bhbh/; / the +x direction. It slows and comes to a stop with a const /hbu.hnwx i/h;.sb d3ant 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 surbg: 7 x/dx0d.mlkhlj0face is pulled by a 5.0-N force. A 3.0-N friction force ret0lj0mbd7 d:.x xkglh /ards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a /om;tvsv4 yg pmxd, 0zp :3pt,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/s. Itn3 ..6i bqpubn hkui 6851owui slides 50 m on the ice beforebo1uu36 . in8p6 nq. ukiwh5bi it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks ls kw.h:f kq2 oi(39va0tjfp 490.0 m long. They determine the coefficient of friction between the c0f 3ijhl4fp:.tako2 kvws9q (ar'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 3m are st k kf3o ,u,ddiks7;hu(acked. (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 mk, ,3kkhf; o dud7siu(assive 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.) Th+n0 dk* hqmo e0ect4)he surface between the more massive box and the horizontal surface ise hq*+dt0km)e oc4h0 n 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 plane is ingohbd 1p3q3)b clined at an anglpg133 h)q obbde of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down )k ;pu-ye45 ujgpqiz 0a 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 k,qu ;c1/m,ewd sp cntsc:i21plane 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 tilted at an angle of5,nsh ou t0tpyl1nh4. $35^{\circ}$ 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 g0s37nej v1y.q4 3wt4vi *7t ldojttidown an inclined plane, at a constant velocity of 6.0j074vosw.*tt 3telyv gid t1nqi73j 4 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 slidesv5.jif q5e4z3q0 pof j 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 slides down a rough y kyjmh 6 /6u+wig ,1khwt*k1x$37^{\circ}$ 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 surface. The cable atta78heb)b hjj, tched to tjb j7h,)8ht behe 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 inclined plane tilted at an angley.*a 6x gfd.sl ofx6 d.g.f *ysal $33.5^{\circ}$ 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 zqtrbt/fh)5tt9j:a/j9 pojs :ls / y5is gradually increased until the object begins to slider/5)fjpl5os yhtjt/btj: :99zq ats/. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?