Which of Newton's laws best explains why motor 9us7 s-0m +jl4 smyy. :bh2vvbaxnoy1ists should buckle-up?

  When you sit on a chair, the resultant force onsgv)4mb v1p et,*wi b, you is

  In the absence of an external force, a moving obj*eob 8c)z /qnwect will

  When the rocket engines on taln:) 71af l)s8*zahr(bcfjuhe starship NO-PAIN-NO-GAIN are suddenly turned off, r)u azjclfs8h7(al: 1 n fab*)while traveling in empty space, the starship will

  A rocket moves through empty space in a straight line withfog6ez9/ (gvot xx7t6sjn 8*d constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied tooovj78s ngg66 f/ttex*d9 z (x the rocket in order to sustain its motion is

  You are standing in a movingf4 qj jeumb/1bg85hs1 bus, facing forward, and you suddenly fall forward. You can 5ujh 48b1/ej1sbq mfg imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall f4n z-iq +bhvwa ox-hl.:y -:tdorward as the bus comes to an immediate stop. What force4h+: xah -tvw-.q-:inldzob y caused you to fall forward?

  A constant net force acts on an object. Describe the ow 5*uz ukc514ws/ecwmotion of the object.

  The acceleration of an object is inversely proportioci4:7drn.dq-b5 fro s nal to

  A net force F accelerates a ma:/-)m8 t 2c1cfllh zyb wjds7yss m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration wilsz )2/wjl7mblcyyc h1f-:t8dl be

  A net force F acts on a mass m and produces an acceleration a. W.r3p5g7ag ifb7 s m r0yrw6i2mhat acceleration resusw 7ib m7rg6fmg.25p3yi a0rr lts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will ocs )wi0zmu6f6 9p5o qfly away. This is an illususiw0)9p5o cmzoq66 ftration of

  Two cars collide head-on. At every moment duri3u;kgacqi8a a:0pu4rdw,1u m ng the collision, the magnitude of the force the first car exerts on the seconudpai r 8 u3;am,kcg: auq4w10d 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 whmcji * 6xl2: 5l*wzv5bnihom2ich the object exerts on you wilwimicxnj6* lvm:bh*o225z l5 l

  Action-reaction forces yr6gct00)wq -e7qysm

  Action-reaction forces af +nq38it4bn pre

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to th k1(jvwo 0 xj(vec1:q20sdd ohe car. Since a d1wdj0j0s oqv:2 kec(ohvx(1lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on w prc.05xr yl )t,b/r ,i7vtnen 6pdzqt+;*xzthis object with force mg, which we will call the action d*w x.q trtlnpt/iz,xrprv5c6+z)b7,ne0 ;y force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth puvy6wzox eubae;+l (5rz f/u 8-lls downward on/e;8u lr-xova z5 yeu+b6z(fw 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 instantaneousiu+7 +z.cyj6q scq2y a force. The ball 6qc jzq2uya.yc+7+si hits the bat with an instantaneous force, whose magnitude is

State Newton's three (rh7t ,bwml.elaws.

  Mass and weight

  The acceleration due to gravity is lower on the Mooyv.5 ywhd m .jsu 15qn;hq:i;on than on Earth. Which of the following is true about t:yiq uyh mwo1 ;. ;5q5nh.svdjhe mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distancbwlb:ke hjp*u l6pt/c:, /p3qe is

  Who has a greater weight to mass ratio, a personvaey1pieb*2n5u n/r 6j97sya iytf11 weighing 400 N or a person weighing 600eea1sr2u / f1ynan1b5jiy p7y6i*t 9v N?

  A stone is thrown straight up. )s9wl-ai1jsnphlooo :; .1cv At the top of its path, the net force acting on ocjn. h )v9o1p: i1wal-sslo; it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from thm2icb9zgrn vsl7u47ef2;a :ae same height. Ignore air resistance. Comparasz2 e l7r7 nvi ;9bfgu:2a4mce their accelerations.

  A brick and a feather fall to the earth at their respective t.jmk prrwx9t/ 5 d m.0zcgm34lerminal velocities. Which object experiences the greater force of air fr.3 /0t4mcg lp.5j9 xwzdrmkmriction?

  An object of mass m is hanging by a string from the ceiling9ydbvni32 cw( e. bi5h of an elevator. The el (h. d9ny3cwiev i2bb5evator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elaqd u;y ( 3vm8b3lj1ikevator. The elevator is moving upward, but slowing down. What is the tension inui;l3vd3qay kmb8 (1 j the string?

  The force that keeps you from sliding on a,aq- xc56knfiqn( q y hz41v1kn icy sidewalk is

  It's more difficult to start mo 5 wc*eub *noat viu+19/cohkrdh/46r ving a heavy carton from rest than it is to keep pu et*kc*/4urdba5uih61onr/ w 9v+o hcshing it with constant velocity, because

  A horizontal force accelerates h;6gdejhhtf5jcg1 i2 9j,yp-a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that g h,jhd; tj- 1 96c2fhgipe5jythe horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined rampjqs +taq n;d2 (3wnn0j at constant velocity. Thus we can deduce t 3qnt( 2j;snj+w d0anqhat

  A block of mass M slides down a frictionless plane inclined at an angle zh v57 op5z su8f2bxq4q with the horizontal. The normal reaction force exerted by the 57oubvszq5f 8hz 4x2pplane on the block is

  A block of mass M slides down a frictionless plane inclined a;s :yvb edm:v5mj ak,*t an angle q with the horizony*;j:evvd5 :askb, m mtal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slidemtos. v e5u(v8s down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is d5(u ovsm ve8t.irected

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on ana)lsmugal3sol y8w-o,ww( 6 7 inclined plane that makes an angle of 30e with the horizontal3(6o,wows aau7smlg-w) l l8y. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface.c;,r,zv knb5z o3r4ru A 16-N force is applied to the object,nrvk3 rubzr 4,cz5o ,; and it accelerates 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 m/s in 7.0 s. Whan8g20s il r:4awqp t4mt is the averap qt2wg 8iam0l4r4:n sge forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of tmdqb 9tdruqav20 6q+ohs. 4- 8.0 m/s in 2.0 s. What is the net force acting on the bodyr49d-d qahqum+otv b6t. 2q0 s?

  An antitank weapon fires a 3.00-kg rocket ww pdw vx6v696pcmtt,; vyj2+: z8aat phich acquires a speed of 50.0 m/s aft;9xzctaywvt6 v dwv6tpa pmp :j2+86,er 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 sape h-r; c cfie-3zs1.yme force that you push a 10-kg mass from reshz pf .-iy3s1;cree- ct,

  What is the mass of a person who wb 1j 7b(yxo,cpeighs 110 lb?

  What is the mass of an object tha:;enaok8juf :,l.bgr67zm 3ui exzl) y xt-6tt weighs 250 N on the surface of the Earth where the accelerati6yb;kxa6.z,:elz37 e uoxigm ftnlt r8)u j:- on 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 the object on ejky y81 cdh *w(hd86bthe surface of the Moon where the accelerat8yceh1( 6kdhj w*db y8ion 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 Moon. The M,e 6l2hveo.z85zl pdsoon's gravity is one sixl.hlpv652 e dse8, ozzth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on ow,am6hyvdivr,k gm .38w9 i4 wpposite ends of a 5.0-kg rope. Sue pulls with a 15wwh8iawm kv i4 v m.d96y,gr,3-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books restsetd: sfm/g3og;, 9fwp on a level frictionless surface. A force F acts on the stack, and itme ptofw9/d:g3g;sf , 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 in9h 6 ;sw7o10l occwwql an elevator. What will the scale be reading wchool;cw wwls061 q9 7hen the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0o xd7aog1/9jy kg and the elevator accelerates downward withx /ga7j 9doy1o 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 cak4: nx8vsmc6-p +til -q s/xthe person is 60.0 kg and the elevator accelerates upward with an accexc 84/q:m tcs-+l vskain-6xpleration 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 magnitub l8f* p/5tpk qebp7b4de of 8.0 N and is directed due north. The second force t4/blpb8k pt5qp *7f beoward 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 held- :x plma5*3lnfym: mm 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 minimum5: 3 m -lamplmyfnx*m: 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. It is he o-wv.2pte:xi 64rh)euiqb +bld 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 time if the load is notix6 i2bu o 4 vqeet)-hw:bp+r. to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 gom;ahk0h zg z /2:-urkg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (g/kg-hh m0z2uzo a:;rIgnore friction and the mass of the pulley.)

  In the Atwood machine shown 6y6a)ei tmhe- in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of6ee6m) -ayhti the pulley.)

  A student pulls a box of booual0:9rxqk5ty8mb n6y9 -c sj ks on a smooth horizontal floor with a force of 100 N in a direct:auyn jl xqcr9k9stmb05 8 -6yion 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 wsz1d(dlo( o4; +m a(w ccpj.qyith a force of 100 N in a direction of 37.0e above the horizontal. If the mass ozo(;(4 sl(wc1d cd y+.qopmajf 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 supported bhauwg6oryg */9kab +: oq95ucy two ropes as shown in Fig. 4-2. What are the kruq5 u9*g9wa+oo c/ b:yahg6tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the maeo+w epw,s)ejwq -t.2s.pv; rss of the traffet 2epoqpe s-w.+rsw.wv)j;,ic light?

  Two boxes of masses m and 2m are in contact with eacah: 2 8io--jso2qdwxnh other on a frictionless surface. (See Fig. 4-3.:2 8s- naji xh-wodoq2) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlftu 0l8l/4i lgess surface. (See Fig. 4-3.) What is 0/ ilultl4f g8the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Finm nxn+g9t*g 8g. 4-4.) If the forward force on the more massive box is F, what is the tensx+8t g*m nngn9ion in the connecting rope?

  Two boxes of masses m and 2m are connectex0 7*cczce1f* mzbvt2 d by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of cvxbc*t e1f7czm*02zthe less massive box?

Two boxes are connected by a cord ruk9yc( frynag4ji 2t7 ;nning over a pulley as shown in Fig. 4-5. Box I ofyr 9yta k7 4i(fc2nj;g 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 between a 3.0-kg box and a deb ,1sav g7l.u mpdm4 z3xt.-tusk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N hoript-a4luz.m m3sgv. ut,7bx1d zontal force is applied to the box?

  The coefficients of static and kinetic vgc8h -x7jm-pfrictions for plastic on wood are 0.50 and 0.40,--g jxp8 v7chm
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 sur p k6 t8zxdoh,e71jh0wm 2ri/rface in the +x direction. It slows and comes to a stop with a constant accelerati8p/7 r0hw k6demhxt o, rizj12on of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting 8304g.;kxp. tdnlru: nf6- yoqe mmkmon a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of 8 n ;x6 motgdm kn4y:.l mkre3p-.uqf0the object?

  A horizontal force of 5.0 N accelercihp*s41x 0nua c5:by ates 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 given )jdeowcd- k /eal(*4 ban initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kib-kaje dcloe */d)4w (netic friction between the puck and the ice?

  During the investigation ofw/kru(f:x/k3v d- qkf a traffic accident, police find skid marks 90.0 m long. They determine the coefficiwk( -drq/:kx/fu3kfv ent 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 brakes were applied.

  Two boxes of masses m and 3m are si51 6 rp ms2gj8fm(mzvtacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfacemjr8m6 m5iz f(vg1ps 2 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 yl:,-fm iiqs 0between the more massive box and the horizontal surface is smooth and the lmii-q0sf y :,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 incmlju74tgnz) r 9b-ei*veu2s4oo9j s*lined at an angle of u- vsg4jmz2*stjbo re)9e7 9oni lu4 *$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle;r50ye0kk:hvi it 2gsn0bj;c of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smd 60f2 pek lrszt sjs8rzg1zkr))l5 .5ooth 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 smokj*1bq0kdi ) roth 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 directly down an inclined plane, at a constant velocity oius o 53pc pj21459xqxzbw xma.a5s)yf 6.0 m/bxu 25wpxj. qc135s5asy9)mai xp oz4s.
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 sspd9/f/ lxuxt: qwny9 n)9oo-lides 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 slidn4v:5dogn9s les 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 lo, (+e7)3ymmmig4rtl/drn s np g weighing 500 N along a rough surface. The cable attached to(+te/ r 7pmg4, l3nirmmdy s)n 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 inclined prp6yb , id9c: al00pcolane tilted at an angle of6odpcr9c y: p0,0l bia $33.5^{\circ}$ 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 j.mq4esvkmt rm1*1vlw*)nwsm8 + q;bis gradually increased until the ow1s*8s; rmwvqk t.n v *mme+ m4)bj1lqbject begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?