Which of Newton's laws best explai+wt* 9 yg )hpl-m6 b6 imds:pbb1:jarsns why motorists should buckle-up?

  When you sit on a chair, the resultant foep8q.ekqh1l ) rce on you is

  In the absence of an nzbezt o210m 702tdmpexternal force, a moving object will

  When the rocket engizvl)j 3gyxl .*fpin :x-(zt,hnes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while tra-i)tl(x x:yzh l3*pjvz ,ng .fveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. souh- opo4q ::It is far from the gravitational effect of any star or planet. Under tou::soq-p oh 4hese 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, and yo 2std9ui(f g.uu suddenly fall forward. Y2 (duu 9istfg.ou can imply from this that the bus's

  You are standing in a moving bnsy*kv/z4 k h*w9 :jdeus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force k*d:y4w* nkh9 vjsze/caused you to fall forward?

  A constant net force acts on an object. Describe the motion of th,u-oqn .fwv 3he object.

  The acceleration of an object is inversely proportionl(4 9a 5cjyegln8h-8j t1+,vjze.hkr.is b tial to

  A net force F accelerates a mass m witlywv o9 u6xouc: h3m03d7fzf;h an acceleration a. If the same net force is applied to mass 2m, then the accel3;7w ouzf6y d9o:fmhx u03lvceration will be

  A net force F acts on a mass m and produces an acceleration a. What acc t8aiai jhuen0 8 /z3d8/v*zrzeleration result/dajua8hr 8t zvn* e0zi8z i3/s if a net force 2F acts on mass 4m?

  If you blow up a balloon, and the(ynr 0vfxc 74q 6;eu-;ywlc cen release it, the balloon will fly away. This is an illus6r(nq;u lc- evxec47 ; 0fyywctration of

  Two cars collide head-on. At eveh 2gskg-b ,qrqj*d ;e+ry moment during the collision, the magnitude of the force 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,j-gd +h*seqr; qg bk2 of

  If you exert a force F on an object, thpm tzqc14 4 nmp./ylf,e force which the object exerts on you wip q,pylt.f14n zmm4c /ll

  Action-reaction forces2wuatnaj8+ w64k m- qj

  Action-reaction forcdf) e 0r:v5nkqcc2jby wkp85 /es are

  A 20-ton truck collides with a 1500-lb cx 1ar0 aylq6:q:pos,mar and causes a lot of damage to the car. Since a lot of dam mq1 axal:pq ro,:6s0yage is done on the car

  An object of mass m sits on a flat table. The Earth pull7wm0r;l 67jwnhbs zn-s on this object with force mg, which we 7rb 7s6nh; m-lww0nj zwill call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Tepjnnuu4+rc3 6; y e3ahe Earth pulls downward on the toy with its weight force oaupr+en3; yj3un6c4e f 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to yon k6v:; bvd5inu with a 1500-N instantaneous force. The ball hi v5k6: ;dninbvts the bat with an instantaneous force, whose magnitude is

State Newton's three lawsn hllc6+y9ym).

  Mass and weight

  The acceleration due to gravityi7ri 48ufiikpb 3k0y9lo3w1n is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on 97iiunp1f3 wkr4i 3lyk 0b8o ithe Moon's surface, compared to Earth?

  An example of a force which acts at a distance isf jxpo)l(m v-i/ijv;3

  Who has a greater weight to mass r)(wnc;iisr9 z atio, a person weighing 400 N or a person weighi; c zsinr9wi()ng 600 N?

  A stone is thrown straight up. At th jemruu:q47u g+q q:4he top of its path, the net force acting on quu: mej4: +u4 qhg7rqit is

  A 20-N weight and a 5.0-N weight are dropu3qzf; yr,eadh5-r ;kped simultaneously from the same height.a; rq ,udy hz-e3rkf;5 Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective termb (pziaw6 hv:wn,5v0v:z 6rc yinal velocities. Which object experiences the greater force of air fnw0:6,w65:vvairhzzybc vp ( riction?

  An object of mass m is hanging by a string from the ceiling of an elevator. u*;qt0 :,lp;l yzel1q:qta rf The elevator is moving up atr tauy1qz:;lpqlt* 0f e q;:,l constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the-3x1k/ucojq q)p .j mq ceiling of an elevator. The el.1 m)qk/3-q oxq jpjcuevator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewal,fs6hvko)87 rp + bkvf:tdd7 vk is

  It's more difficult to start moving a heavy carton from rest than it is t u*up+kc3hbr6 o keep pushing it with constant velocity, becausepk6 uh*b+c3ur

  A horizontal force accelerates a box from rest aio uf.sf9k3xxef iz +;u4f i-zk8*q; icross a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions;u + if*.ifsi-ui 94q8;oezkkx3f xzf remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down a7d9r h/f6s+cj 1a7( isn xgwwhn inclined ramp at constant velocity. Thus we can dedujh7gw7xr+1s/ 9 iw fasdc(6nhce that

  A block of mass M slides down a frictionless plane inclined at an anvsj :4h cxp,cpj5g9c(gle q with the horizontal. The normal rg ,cxhj:(5 pc4ps9cvj eaction force exerted by the plane on the block is

  A block of mass M slides down a frictionlessw*6y5 o5cu bxw plane inclined at an angle q with th6 5ubwco x5yw*e horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q xs9ghba lr3,pnc 06/ cwith the horizontal,b9/6h r 0plgcx ncs3a. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released sim ;t1xwmlweatcxe 4d ,2gh 9.g(ultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes ehg4;dmc t.21w9( exgwtl ,xatheir acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to thjm n.r8o nfnf144ms7h e object, and it accelerates a7 4nrhm.f1 m4nfonj8 st $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7 6s mb;f q)uajbj6:bu/xtt:*t.0 s. What is the averageq) : m/jxt6bs bbj fa6t*t:u;u forward force on the car?

  Starting from rest, a 4.0-kg body reaches a spe6p/ i26ep j1cslmcr4 kmh;m4sq f9 mp)ed of 8.0 m/s in 2.0 s. What is the net force actinc14m/ml;rp h69 4 sspq6 )fpkcejimm2g on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0ck.j g jxfo9e/,y6 r5za,dq. j m/s after tzj6dagx,c qfr 5o9,j. eyjk/ .raveling
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 theo9,hk9(irlxzgtw7gfomv 866 same force that you push a 10-kg mass from reszo69to 7l k6mf,vggi(w98hx r t,

  What is the mass of a person who weighs 110 lb?*dyj;ij8um2ftvei 9k ;6 v au6

  What is the mass of an object that weighs 25 m8jdccfa ()u(0 N on the surface of the Earth where th(dcumfa jc ()8e acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Wh :nr*5 (thb4ny1 ql( ll;wa3rnz4sw ufat is the mass of the object on the surface of the Moon yq (f3rsn w:*5ntlab;1hun4wll4(r zwhere the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, zyc5juhw8yt6 q8c)lt lc*t 1v2n75cg and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Eant68cc*2zyl7vc1 5tlhg8c 5 )wqy j utrth's. Compare the masses of the objects.

  Sue and Sean are having a- 652wi7;oenc ybqbhr*wue ctb ny. 0- tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a2en- ;cbebro*bt6y. qwuy 0ci n-5wh7 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books restsfz 2c(kasym+b2-ovn/n ;h z*w on a level frictionless surface. A force F acts on the stack, and it accelerates *h-wyn(;bnfckmo 2/a+ s z2zv 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 k1(r ,axpo k-a.rt4tg stands on a scale in an elevator. What will the scale be ra a4rkoxrg tktp.,1(-eading when 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 pers;/ ei/xlaya10 y(yf zqon is 60.0 kg and t/(/la ;0xyzfaieqy 1y he 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. 9w g7r -qis)wzq4eb47rl-oao If the mass of the person is 60.0 kg and the elevator accelerates upwarwq7el bs)4row9- zar7 io-q4gd 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 au*(tb oc9amrv6ylx4 7 magnitude of 8.0 N and is directed due north.o7vtcmb r( 94 *xlyau6 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. h-7 pme fug-;nIt 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 m -f-ph un7g;einto the cab?

  An object of mass 6000 kg rests on the p9f(i7kef /bp 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 15 m/s, what is the minimum stopping time /kp 9feb(fi7pif the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, ifrdd* ba ,bod+. M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mdd+d, . rbbao*ass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40- a98n7gfqfq3g)1 /xnmmslg d kg, what is the tension in the string? (Ignore friction and gg 3 nf 1mqq7xg)nf8 9/-dmlsathe mass of the pulley.)

  A student pulls a box of books on a smooth hor mizjge.5m 2w3 f)wrrv 3h(;vrizontal floor with a force of 100 N in a diwvz;3 mjrgrre ) m2h3( v.5fiwrection 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 for ao/a6hmdh 7cg v)/d:wce 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, what is the normal force on thhh6w:/)7amagvdc / doe box?

  A traffic light of weight 100 N is supported/ab,qn)5 , foxb h;uqk by two ropes as shown in Fig. 4-2. What are the tensioa x ,bhu5nq),f/ b;okqns in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, 3hppff7ira-*g ;mfi2 w w9ah4 what is the mass of the traffic light?2wa79wpfh3 h4;ig m-*rfia pf

  Two boxes of masses m w b9obmiec,+5)em4hf aeh:+s and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerwiee)h+5fo h bbc+am, 4m:es9ation of the more massive box?

  Two boxes of masses m anxslf u+no1x,5enle+ e 9zh33 hd 2m are in contact with each other on a frictionless surfaceh 91+l5e +szlxn3hnfe 3uo,ex. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are /k3q*puz 3,o b2tpok jk9 +uszconnected by a rope. (See Fig. 4-4.) If the forward force on 2 pz3uks*tkbpu+ ,qj 39ozo/kthe more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connectedyoo(ed70 63wxvn lm8 y by a rope. (See Fig. 4-4.) If the forward force on the more massive box i8wyylnx 0d 6 oo(3vm7es F, what is the acceleration of the less massive box?

Two boxes are connected by a cord rjhpn4e,p0km5 9.hqfz 4lihp. unning over a pulley as shown in Fig. 4-5. Box I q 59jml, pzf.h. 44ei0ppknhhof 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 sta4e h r54f0zi8vyobz; btic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box wheb 8i0h;zez5rb44 fvo yn a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictio1grq3cls(v*x+ uku*d rszfu5;fs1e3 ns for plastic on wood are 0.50 and 0.3*l(srsk; fsz euf3gx 5rvdq1c1+u*u40,
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.zwmdf/l 7-f7 t It slows and comes to a stop with a constant/fdml7t7f w -z 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 surface is pffv,1g0w s m3(pggh-dulled by a 5.0-N force. A 3.0-N friction force retards tp h,-dg1mgw3g 0(vffshe 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 rara1 *.qf xowc,te of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a pucgc 7gmso+) cv oh-uum9:.:uszk is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between tosvu hgu. +:cmcm-s :)o79 zguhe puck and the ice?

  During the investigation of a traffic accident, policeb b0g lptbi;*: find skid marks 90.0 m long. They determine th ipl*b:;0 tbgbe 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 brakes were applied.

  Two boxes of masses m and 3 qvl:*nqn4xxdz o375)d;8z qmw, dnmfm 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 sz m nfvm 74ddn5dl,:;3 8zq)qw*xxqo nlide 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. f08xj6fjg7j05cj uf;mxnz;j (See Fig. 4-6.) The surface between the more massive box acf5xm0 0;j;fj xj ujng8 jz67fnd 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 static friction between the boxes?

  An object is on a frictionless inclined z9qg1edn w fvur shrqg6e -..l66o k1/plane. The plane is inclined at an angle of 69-wnhoe 1l6vd 1r kqefg/.g6rsuz q .$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an an wuz-etce6k900o9ine w s5m.ugle 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 pzoay3ykrj3*r s3d -l*lane 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 tilte0jt8+ n qhqat)3qqb1va2:x bda:mi c 6/-gvfyd 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 p/gp3f +6p tv,vi5z i 0nu0 s;oam2peewlane, at a constant velocity of 6.0 nappf tw,gm2o+ipz vsu;0eei 3605v /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 sl (trr* t)q yi62g3lstbides 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 dowj;n 5vu9y )sb4lcydt5n 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 alon7omogvcv4w;m;tcy nm9/gqrc 1*( f4 o g a rough surface. The cable attached t1m (gc4v4omcog ; cv/9o7tn;y*wfqrmo 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 plane tjo/cbw2k;0gm)rg:qn5 yb h h 4el6a1r ilted at an angle bec )g4;:ky1 m hbgora l/w5nhr26j0qof $33.5^{\circ}$ 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. o j1nv:1,oo+a xs1-unku0 ppz 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 frictionp-:1uoausnzp n+xv1k j1 ,o0o between the object and the plane?