Which of Newton's laws best explains why motorists should buck*6: yrk7, ;dcd+qb avwqk8jr8m7 v+oxuwlxu6 le-up?

  When you sit on a chair, the resultantwb16b n u3o9b paud58 r/tye,y force on you is

  In the absence of an external force, a moving obikb3 +6fzkz5 bkjc,+( mha3n 3lsxj6z+tu.idject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly / +bhcf2 hh*2j wcfqy9turned off, while traveling in empty space, the starship h2f* chyc+wh9/2fbqj will

  A rocket moves through empty . j5 j ooeatud,8)hqxx02x:i jspace in a straight 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 sustain its motion i.o5o 2j8j,)tq xdax :xeuj 0ihs

  You are standing in a moving bus, facing forward, and you suddenly fall forwarkvq+9 ya 8d *0:kqigm9 vkbb(ed. Yoqv98+d (qbkk9mg0vikeba*: y u can imply from this that the bus's

  You are standing in a moving bus/3w8z4c orad (tf:gkh , facing forward, and you suddenly fall forward as the bus c3tckghwa4 (r8d: zo/fomes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. syv5cf(v4-p);-. dydtjkgfke1sk8 f Describe the motion of the object.

  The acceleration of an object isf1-vcg v()j1d juevw ul 6m02w inversely proportional to

  A net force F accelerates a mass m)txjepbh5g fv5un :r3p u1lv)3 e .c(q with an acceleration a. If the same net force is applied to mass 2m, thvlr51gbquvc3 5n:te.fuh xj )(p3 p )een the acceleration will be

  A net force F acts on a mass m and prg,we4hgk 5-ai oduces an acceleration a. What acceleration results if a net ,aike-ggw5h 4force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thhiapmm37w65t z,zrc )k bv: n,is is cprz7i,az,m n t3wbvmk: 56)han illustration of

  Two cars collide head-on. At vs p 59/dgcd6severy moment during the collision, the magnitude of the forp gvd/cd 95ss6ce the 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 forcebo-: 2k tl8voyzph 0:u F on an object, the force which the object exerts on you wik2b0t v- :uzl8py :hooll

  Action-reaction forceut0 d9p8bf *9ft3,b9vz jgi*s.cxtul s

  Action-reaction forces a)aeq0 .iss9qn re

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the caut+*6 bqxj w,b5 qsxm3r. Since ajsq+5, u*m tqx6 bxwb3 lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pullpk:( ci/bvu: ks on this object with force mg, which we will call the action p(vu:bc/ ki:k force. What is the reaction force?

  A child's toy is suspended from the ceiling by meaado8+0s3kuljse e7 g:ns of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action forcj0eaog8d7sks 3 l:u e+e," what is the "reaction force"?

  Your bat hits the ball pitcwwm:)- +r dyk mq8wie4+va2ar hed to you with a 1500-N instantaneous force. The ball hits the bat w- qwy dvra)wea: wr8+k2m4m+iith an instantaneous force, whose magnitude is

State Newton's three lawsq t 2;qz(j9va4kas-d+-j7kpoka 2r/l6xtwvf .

  Mass and weight

  The acceleration due to gravity is lowerfg: o k2jq*qt;l;xl)hub,,i 0p;xpbqw t0, aq on the Moon than on Earth. Which of the following is true about the mass and weigflwq;,ahbqxb 2g xqt q;ktu0oj,i,;p lp):*0ht of an astronaut on the Moon's surface, compared to Earth?

  An example of a force w(vqn+d. jing( hich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a pers -t f o,+gfu 4:q7+utbxfrl)i x+oybsqi+3j;von weighing 6+;x q++ oi)s4o3yv x+tru- bit :bflfjf q,gu700 N?

  A stone is thrown straight up. At the top of its path, the net forc5n-cu ph35n raasomb82m22hhe acting on it in ha5onc b3h5rm 28 2s2u-ahmps

  A 20-N weight and a 5.0-N weigy3+ yfphracu ,8q:6zsht are dropped simultaneously from the same height. Ignore air resistance. Compau+3fh:c 6, p ayzsrq8yre their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocities.w8 ly3yzr47i24o:*ue x jqebp Which object experienceie p:4 ozyu*8j2y43we lbrqx7s the greater force of air friction?

  An object of mass m is hanging by a string from the ceilx c3)q ;g2iofjh(el e6ing of an elevator. The elevator is moving up at constant speed. What is the tension in the string?2jig6)eq;xo( c f3eh l

  An object of mass m is hangino3x83 p;ok+wra r +oanw9wb+cg by a string from the ceiling of an elevator. The elevator o p+rbno;wa aw 83rwkxo93 +c+is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you fr,xtrti ti* t;u 3xer59*o kkr;om sliding on an icy sidewalk is

  It's more difficult to start mogvdx*zp 0gz4/ving a heavy carton from rest than it is to keep pushing it with constan*z g0g4zxp/vdt velocity, because

  A horizontal force ac+3o:a ;bfeq oyxlh, m*celerates a box from rest across a horizontal surface (friction is present) at a constant ratol: hq,+ bx*a ;fo3ymee. 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 down an inclined ramp at coz pdu(0f+s7 a1dv +ejjnstant velocity. Thus we can deduce tha jpa 1sve0fzd7ju d++(t

  A block of mass M slides down a frictionlef 89ofu: mqs9rss plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on9urmf98 q sfo: the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wit:pap9o8 rd3su zo7ew.h the horizontal. The noro p:z97osa dp8 .3eruwmal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at n4hkm v3nn b0su (3xp)an angle q with the horizontal. The gravitational fo) b3pu(43vx mn0nkhnsrce is directed

  Two toy cars (16 kg and 2.0 kg) are released simu/k * q-6+lajcn) xpv k m.myzmk btwv8d074by5ltaneously on an inclined plane that makes an angle of 30e with the ho*y)k5/tw z7blv60 jkvky4+ cm -am.dqnmb xp8rizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surfr25jmkyeg7lpo-b ew5t-7 c 4s ace. A 16-N force is applied to the object, and it acceler 52-y 5em ejk7l4cos7rwg- ptbates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelesjh px)gu y)icqyt:75 b( )ahg7.bax7rate from rest to 27 m/s in 7.0 s. What is 7hya 7acb g(qi) xbhy7t)x5sjg: u.p)the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed 6 l):ezg(amtn of 8.0 m/s in 2.0 s. What is the net forcn za( )glm:e6te acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 k y/ k ul1i qz//vo3zk+g,y6hcm/s afteiq yylk/z+1cok/g vzuh6/3, kr traveling
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 push a 10-kg mas;1ru;b:fa c izs6ok2b s from rest;c u;1:boi sb 2zrkf6a,

  What is the mass of 4.+ 9fybigj;y a)j uaqa person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surfaclpuhokz30czgxo3.22* qbtb . e of the Earth where the accele c2ohtk*.pbozubg3zq3.20x l 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 thq5sgy1*rg 9r.wtk tcip- ty7 ;e object on the surface of the Moon where the accyi t*t;-rkc wr5. 1y9ggst7p qeleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the p1,x-p 3kifc gMoon. The Moon's gravity is one sixth of,gkp -pf 31icx Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pgnc 0 :,t9n6:gz,mvz zx3e-6kyfu xp yulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelera3k:6yy ,0xzx z gp-6temgzfv ,nu:cn 9tes toward Sue at $2.0 \; m/s^2$?

  A stack of books res/xar f (q-lvxzpz.vq)262wj:kluvp 0 ts on a level frictionless surface. A force F acts on the stack, and it aa- p.0)lpfv6uw 2 2rq:/lqz(zxvvkj xccelerates 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 elevator.uz y285kqaja dlxo z *b-a27t8 What will the scale be reading when the elevator is accelerating downwar8z 5l ka* bz7aodqax y2t8u2j-d at $4.00 \; m/s^2$?

  A person on a scale ridd e;yl, 18 vzu:ji8hudes in an elevator. If the mass of the person is 60.0 kg and the elevator accelere j lv uuid;z88h:1dy,ates 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 mass of the person is-vo ( fnc6mtpi4 be.1fvr-: vc 60.0 kg and the elevato b 4t-ofipcnv1v:6mrvce (f.-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 magnd u;-3/9vb66dz.6ph gy/ qrkss glnv yitude of 8.0 N and is directed due north. The second force toward the east /k6 -gvy /. du;by693gvlqsrp 6nhzdshas 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. Itg;.g-ssvlt4b3of ( iyk ed;d2 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 y;esk ggv;2lo -sdfd(.t4b i3s the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg s (km /gzz-bdoy)1hc (rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontalh 1 dc/(z kmz)yb(s-go 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 = 0.60 kg and m = 0.40 kg, what(wgmq /;g v-of is the magnitgmv oqfg; (-/wude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1ykvwwbf9(me jal+s +*q1w1 )/-kosr g, if M = 0.60 kg and m = 0.40 kg, what is the tension in the strin (y o ++jarlwv*1- mbfge1k)sskw/qw9 g? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wititw;q xn7i a87 ttd vx4s-l-yv5(qlm1h a force of 100 N in a direction y4qsvaln8l i-x-7t 7mw ;t1i(tx v5dq 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 horizontal floor with a force of 100 - 8bx - zfbfx,ouytb65rw-8w kdbz:7 iN in a -,xub8- -f5 dz f6iborb xtb:wkw7y8zdirection 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 weight 10 b* w z9z22mdo)dlst02hk, tjv0 N is supported by two ropes as shown in Fig. 4-2. What ar 9h0jmvzoz2dwtds,)k2 2 t*ble the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes q0z *q22np-ztwbr7hk are 50 N, what is the mass of the traffic l7nrw0zhq 2 bk *zq-t2pight?

  Two boxes of masses m and 2m are in contact with each other -c(sn c)5xqbz d,)kq xmc 2+ib m3pfo7on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive b b n5cbdc+qx)kmx-73fs, 2 copq(z)mi ox?

  Two boxes of masses m and 2m are in contact with eackw 1e.foed4(f h other on a frictionless surface. (See Fig. 4-3.) What( feowfekd.4 1 is the net force on the more massive box?

  Two boxes of masses m and 2m are connected b q:s;0m: z.mjs-fhrtpy a rope. (See Fig. 4-4.) If the forward force on the more massive box im-hr :0p.z m:;qjtfss s F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m ar ;68:)ino7entxj9p;m0okog kvlxc;y* qra) ze connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massj 8 :ztoa xn;vgkro7ok)x; cnp9m) 6ye*l;iq0ive box?

Two boxes are connected by a cord rz:tbp f+f g)3nxonv s834g-icunning over a pulley as shown in Fig. 4-5. Box I of massngvtizcgo4 p3f n:xf3 +)b-s8
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 fa*;td/p 9wr .bons kh,rictions 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 hso*. r wbkaptd, /9n;N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50 avswc8p02j/gf: s7 o) fr3uk;f/cvftn6o yu2 ind 0.40g kffcoi0 7)r 2of/v2/3j:ncy s 8sv6tpfw;uu,
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. It slows and comf kd h6 dv: yfriagzj+-z80:g.h67kcges to a stop with a constant rdvggk76kd h+j c::a6y.fiz08hzf g-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 surfacea 6 q0(af3 ztquvbz mp3z 9wgl;10a;hq is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of thlb w3gpqf;zz9;hz01t( 6aqqau0 3 vame object?

  A horizontal force of 5.0 N accelerates a 4.0-kg maj,sb3 rmayp(6+ qsuj 4ki-cy. ss, 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 initial speed of 10 m/s. It ss24zyy 6au9i nlides 50 m 2ia ys96nu4 zyon the ice before 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 markc5nvy0 / tun4ts 90.0 m long. They determine the coefficient of friction between the car/5u 4t0v ytncn'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 stacked. (See Fig.cxpe/:gh1g z jl9*n 3m 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If tpml*ez3c1ng9j :gh x /he 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 stacky,rra o/kzx 1r9)te/ jed. (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, what is the coefficient of statir/a rj9rkt/,xz e1yo )c friction between the boxes?

  An object is on a frictionless inclined kbdye-tp2 . l9plane. The plane is inclined at an angle o b t.peky92dl-f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hiu-n a- ;eh (ij.eev(qull 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 sv/djc8 s:lxf 2mooth 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 inclined plane tilted at an angl8 canhj lhj9 rmingy7-8(ya.h2v*sa3e 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 y/ hlrb o9av zy; g92qz89.k:nchiu9 kan inclined plane, at a constant velocity ofayiokc/qu yvlh 9:z9;.28ng9h9b k rz 6.0 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 down a fx22 s.asflj h-xyltr:3 q((yhj,ell8wv8- xrough $37^{\circ}$ 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 dkl:go 2uhk2ik3 w:.1psg okq) own 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 weio :qhqx)/h/j tghing 500 N along a rough surface. The cable attached to thqoxj: hq/h)/te 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 av bi+,4oc;cjrough inclined plane tilted at an angle 4;vb,a cj coi+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. -: aok6pm:bvaat3n bh7 m1gy )The angle of incline is gradually increased6:ba 73t:g) - mmhaonbva1pyk 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 the plane?