Which of Newton's laws best explains why motlc47ubezm 40i 4(kufzorists should buckle-up?

  When you sit on a chair, the resultant fozajj (xn 1kxs*qbu)0 ;quv0 )orce on you is

  In the absence of an external force, a moving object willf)jmx; :usd51 a i;lx,gcpc7y

  When the rocket engines on the starship NO-PAIN-NO-Goz7l8m,;f.q cm zseg7AIN are suddenly turned off, while traveling in empty space, the starsh.gmqol,ec s7zf 87 mz;ip will

  A rocket moves through empty spacepxc29) 3 7ilfqp;teew in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under ecl p ;i)7wf q2t3x9pethese 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, andkmwq b snod9bv)a4-y)ts k;0( you suddenly fall forward. You can imply from this that the bus' t(;d)vs s-9kam0q) 4wnbob yks

  You are standing in a movud8 s9o.t 7:hemb4 *r2nk6 x8g xknopving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force cause62 4r ops:o*. xmunek 8gdkxt 8b7hv9nd you to fall forward?

  A constant net force acts on an object. Descri6nee :dq0s ,dy*zyb m r0ssf7-be the motion of the object.

  The acceleration of an object istsa5znaux x / 9j4.r;-vq1blv inversely proportional to

  A net force F accelerates a4s5qph u g*gae)*i g)ovvr.r gl 3f:h9 mass m with an acceleration a. If the same net force is applied to mass 2m, then the acce gvu4 g)v9ghfeaqo g3 hl*:.irspr) 5*leration will be

  A net force F acts on a mass m and produces an acceleration a. What a.i/h2gukxxyf(szc 5 itis t+ula550.cceleration results if a net force 2F acts on mass 4m?c5h.+ygt(fxask/0x 5u ls5z2iti.u i

  If you blow up a balloon, and then release it, the balloon will flyjzz2rj *(fa62ienopg p jb (+3 away. This is an illustratio2n ( zif p*rg(a3bo2jj jp+ez6n of

  Two cars collide head-on. At every moment during the collisi jq cotr,i86o :1a3bjhon, the magnitude of the force the fict6 j ao,8jir :13bqhorst 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 ob1l1:6i y lcq ,ujixfy2ject, the force which the object exerts on you willi, u1fc:lq ylx6j2i1y

  Action-reaction forcm km)rm3i 5*5pz c3vjpk7i mo4es

  Action-reaction forces arrl /u1htwfgkc 3-,)mw e

  A 20-ton truck collides with a 1500-lb ca+* u6.oxp7xpvoe any 5r and causes a lot of damage to the car. Since a lot ofn7oo5p av*ex+u6.xy p damage is done on the car

  An object of mass m shuh* gz-l5sst q23tr.w 3ddw(its on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reactisdt - stzu( w3q*gd2hh5w.r3l on force?

  A child's toy is suspended from the ceiling by means of a strzm;phcoj. m9 4ing. The Earth pulls do4mzc; p9 jhom.wnward 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 pitched to you with a 1500-N instan,q3nmi xb9;kto/j)m1 i-ro t utaneous force. The ball hits the bat with an insjri xtq 3;/mi1,ubokmn- t )o9tantaneous force, whose magnitude is

State Newton's three law 5:ufmej05z rul0nv 5rs.

  Mass and weight

  The acceleration due to gravity +:qy g ma*uxz5fpk .m wuq*2p;is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's ug zmq ;qxk2py+aufm5:.w**p surface, compared to Earth?

  An example of a force which acts at a distance il )kxxq+ /5oxytl qc;(s

  Who has a greater weighto*)u mtgo1mq:ktr,) wz: w razp1+6is to mass ratio, a person weighing 400 N or a person weighing 600 Nm:au *r 1zwtos m6ipok),r):+1 twzgq?

  A stone is thrown straight up. At the top of its path, the nemrhko.rls9u gjl24+( t force acting on it isu r 2klgosjr4ml9.+ (h

  A 20-N weight and a 5.0-N weight are dropppj azf1*4( w np2bqsu4ed simultaneously from the same height. Ignore air resistance.(qz s*uaf2wp 4p4bj n1 Compare their accelerations.

  A brick and a feather faldary. *l h 34smmyz,j8l to the earth at their respective terminal velocities. Which object experiences the greater force of air yj8 rz.ymdlma,43 sh*friction?

  An object of mass m is aeh ;i 8zr+)chhanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the ta e8z;i+hch)r ension in the string?

  An object of mass m is hanging v2r 4db5 rn1bcby a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string?nd 4vbr 25b1rc

  The force that keeps :q :od+cxfm1v you from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton froeu6t 3v9 gj,x 2qwmmc: 5pw;com rest than it is to keep pushp 5cm6:3c uewx2,wvg ;oqmjt9ing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizo9j/wum23m *rrhkjia/,w x4 r9h vv;8 ham cp,yntal surface (friction is present) 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 accelerrm8rwvhxhj9cv,mw y hm/;4 a/ p32ur*j,iak9 ation?

  A packing crate slides down an inclined ramp at constant velocity. Thus we ct61+m shgi2:j me8fka l.ct-han dedhm c6ljk1e 8t2.: af-+ts mhgiuce that

  A block of mass M slides7zdip1(m7 yumt, u u.s down a frictionless plane inclined at an angle q with the horizontal. The normal imz1 uyd ,t ps(.7muu7reaction force exerted by the plane on the block is

  A block of mass M slides down a fricti 4n,vral,w--ao p( qyjonless plane inclined at an angle q with the horizontal. The normal reaction force exerted by thw,aon qr,- 4alpj(yv-e plane on the block is directed

  A block of mass M slides down ao+.j x5k+nq fw frictionless plane inclined at an angle q with the horizontal. The gravitational force .5+xnjwf +qokis directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an imn3z5d8 ic ;s+imeasdrz17 5hnclined plane that makes an angle of 30e with the horizontal. Make a z3s nd cidas;mrm7 51i8+ezh 5statement which best describes their acceleration after being released.

  An object sits on a f,iye(;3sgz +zw;0euu stbof+l 3qq5uv 4z r 8frictionless surface. A 16-N force is applied to the object, and it accelerates ats5t ;zsl3ri +4bzwqfqvyo 3 uf+;,e8 egu(z0 u $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from res;r8r5g x3 ysqs1k1m hv6x b6pct to 27 m/s in 7.0 s. What is the averagekxv5sh6 bpx8 ;rmy6s 1 1qrcg3 forward force on the car?

  Starting from rest, a 4.0-kg body reaches n3hz4/ww1x /cde 1uewia om-fv7i+ i-a speed of 8.0 m/s in 2.0 s. What is the net for3--ni czue / v +fiwa1xew7/md wio41hce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed 13c.9w2wbginj-hatxe k .i 2xof 50.0 m/s after travelin 2a.x i 1h .2nwcj9g-iw3bktxeg
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 mass f:j(mfp+e9dw rw:t 1yb rom resw(t 9je+r ywp::dfmb1t,

  What is the mass of a person who weighs 11u v2f ji*vqy md;7++vm0 lb?

  What is the mass of an object that weighs 250 N on the si8h yp;m1j1g gurface of the Earth where the acceleration due gm;ih81jp gy 1to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of th)i2eui *zz n+ne object on the surf*n ) iniuzz2e+ace of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, a*pd/ 2kio n*iwnd object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the k*2on pdwi/ *iobjects.

  Sue and Sean are having a tug-of-war by:ur/8n sk)u w5rw w1uw pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceleratew)w w/uw1 ks8nu5:r rus toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A 5pmb4xhsc+ox1l1g6p wh4o*melt (*i force F acts on the stack, and it accelerates aemlci6 *mlob(1 4p+p xxhs t5*o4hw1gt $3.0 \; m/s^2$. 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. What will the scalj** e /+skdabihz9+ hze be reading when the elevator is acceleratib ez/s+*+di9hajk z h*ng downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If;v7; r3evbxhz ykot* 0 the mass of the person is 60.0 kg and the elev z*;0v;r xt3ybve7 khoator 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 mass of u7rk38ju:4: zdy c ecn.w9szk the person is 60.0 kg and the elevator accelerates upward with azd7.w u9:4 z3cr nycksjk8:uen acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg ensabfuk+ /38 hi; +gge v*l* cmlhm,4mass. One force has a magnitude of 8.0 N and is d 4+8n/*l,m;+egvuh3km cel gisf *bhairected due north. The second force toward 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 h7 tjc -1mflqy0nn2r7l kw+q.geld 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 loqt2 7w rlgm jl.c0y7+-nfknq1ad is not to slide forward into the cab?

  An object of mass 6000 kg resng7tl v: -ydt9 rn713txss*uwts 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 truck is traveling w st:n9vrxgtn*3l7u-d1s7yt15 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 = dkp 0*orb;g( q0.60 kg and m = 0.40 kg, what is the magnitude of the acce*;0 dpkob(gqrleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine7 va cbxc+2la1 shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Igna lxc1+72bavcore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth o t(g:, pgte7ahorizontal floor with a force of 100 N in a t :ptog7,g ae(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 smoothqb +cw vc9d)3(h7zyt2rk l 0ry horizontal floor with a force of 100 N in a direction of 37.ht) rb7qc(y+ k92clr 30vdwyz0e 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 100 N is supportedcth;m4l vxgv) u+pf *b,4.j kjd+ sy5q by two ropes as shown in Fig. 4-2. What are the tension kqlu) sjcd, b*jyfg5++4;xpvmt4. vhs in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the traf.x-;kaq,sf n ffic light?fq.s-k;f a nx,

  Two boxes of masses m and 2m are in contact with each other on a frictionlessqd0 n)v2v dwe:kl37v 5mxy)9uu+ jihs surface. (See 7w3mh+:ijvnus)2qv0vykld x95 u )de Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each aops2w9 cq6r6other on a frictionless surface. (See Fig. 4-3.) What is the net force on the morpac2qo 96rs 6we massive box?

  Two boxes of masses m and 2m are connected by a rope1rzhd3jh *-jb . (See Fig. 4-4.) If the for1-hj bdjzh3*rward force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.)k(trd(*7d ; qt+dku jhx 02pmc If the forward force on the more massive box is F, what is the acceleration of the le kr+qduxk7p(t* ;dj 0m2ctd( hss massive box?

Two boxes are connected by a cord running over a pl p gg009dohy3ulley as shown in Fig. 4-5. Box I og 3lyp09do0h gf 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 kinetic frictions betweenqaczlcgr2xm4ap :9+3 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 applieda3l: 4pc 9qm2x+ac zgr to the box?

  The coefficients of static and kia;fl1ti 6l+ehnetic frictions for plastic on wood are 0.50 anl6i1e +l ta;hfd 0.40,
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 comes t2d)ym u- 3uajpl 0nw q2os,n*bo a stop with a constans u*3qjnmd 2 wabul -2yno,0)pt 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 f pv+8 9btj8xrhorizontal surface is pulled by a 5.0-N force. A 3.0-N friction force v8t98b xfjr+p retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rebs cp68 ndz2u6p6k+ nlst, 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,vn:)9u3swv8xb5s;ptz mp cz c+6o li puck is given an initial speed of 10 m/s. It slides 50 m on thecmo c6 +)vtsix z3s:u;v p b,5w9nzl8p 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 fo3 js42zm kec) vcwq r8tg7:0eind 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 the car when the br ze)ecgr 7k4jo:s v3c0q82w mtakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6s+y 0glia 4+wfo 1e1cb.) 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 static friction force on the les+04gf+cbl i yeo wsa11s massive box?

  Two boxes of masses m and 3j9rms ;wlvyx8owu)/: zg 3kubj7( z4 um are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surfacu yr478ws l uzkb3;jx /9:)oz vwgju(me 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 static friction between the boxes?

  An object is on a frictionless inclined plane. The plane irjgwl 0l.wwb(nf/92 6v5;qfl h5 b fbl4oyd*bs inclined at an angle wwn6qlb4./y*d(gf0 bl 5v b9orlw2;5hfjbl f of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill .f +18l;yivyo-o ghdddt 7(p ythat 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 plas lr-kr8;1vxpy l;ah2 f/hqq/ ne 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 inclc3 td;-x(iytf 7jfu) lined 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 directly down an inclined plane, at a constant v5nq jwrwt )nm1px:r9gk l-e (-elocity of 6.0 n: 5epwx9-t -wjl)(1 rgnmkqr 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 slidcgfl *h*x l4 a,d79z.uxr.bmzes 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 slidebqf:d- l0m/f 86mauzws 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 log weighing 500 N along a rough surface. The cable attnyxo7/y:na ( lached to the lo anl:(n /yy7xog 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 reg8tyj:u:r9wa st on a rough inclined plane tilted at an angle oa u:jtwry89g :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 pla -xp-n 3es u+5j qlv-),lgprsjne. The angle of incline 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 el,r5p j)-lsju3q xs-np+gv - the object and the plane?