Which of Newton's laws best explains why motorists should buckle-up?0z iui 8v8xp;jwgf52e

  When you sit on a chair, the resu6o4. sbml imk(wwh:-hltant force on you is

  In the absence of an externalb* /fyg yvpr2b)t)3(igt (w yb force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned5ejc(: -fo ybg1ky7++*nw ruhms ,dr y off, while traveling in empt*ybshmcuk 7yeon5 rd (j-gr1+, y:f+w y space, the starship will

  A rocket moves through empty space in a straight line with coz *zue:7tr- 1tq: npfg+ s2apanstant speed. It is far from the gravitational effect of any star or planet. Up:1s: -*fze t2tgpz nuaa q+r7nder these 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 you sth oev5w,.a;buddenly fall forward. You can implywvh5at,bo .e; from this that the bus's

  You are standing in a ttzbg,*iquogc. (, y(moving bus, facing forward, and you suddenly fall forward as thet,i*.t(b ocug(gyq ,z bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe th p*n.lnw6x/-r tpelfp4b/u g2 e motion of the object.

  The acceleration of an:a utq51oubj5 object is inversely proportional to

  A net force F accelerates a mass m with an accesjz7y6ud (jev+* jz; ileration a. If the same net force is applied to mass 2m, then the acceleratidji*u+s;eyj vz6( 7j zon will be

  A net force F acts on a mass m anyy4) gu e6zq 5py-isu+d produces an acceleration a. What acceleration results if a net force +uu)piey yzqs4-5y6 g2F acts on mass 4m?

  If you blow up a balloon, and then release it, the b2 fy++up6n taralloon will fly away. This is an ifay+urn t2p+6llustration of

  Two cars collide head-on. d*+ovviufob/q c4t*c/ x nw*0 At every 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*qt+dxv uci*vo/wcf 0/4bno * first. This is an example of

  If you exert a force F7kgg/cb8ihnw; u .0mo on an object, the force which the object exerts on you willg8mb noh.7/ ic;0uk wg

  Action-reaction forcesq e8.m vjnwc r-w*(br+

  Action-reaction forces ar9( (/ditrm +oqw /ngap5rtf p9e

  A 20-ton truck collides with a 1500-lb ca339(trbs evk4iz7fz u ug :sx2r and causes a lot of damage to the car. Sinceuvr2t :es3k7szx(fiu 49 3zb g a lot of damage is done on the car

  An object of mass m sits on a gz,.09goe v cgitnp0e+ *b zd 1om./twflat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reactit m. zgo00w+vi /c.9b,nogtg*1z peedon force?

  A child's toy is suspended from the ceiling by means of a stri8e ej8emiqs-u04np y6ng. The Earth pulls downiee yuj- npme sq68480ward 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 instdec;v yb.y j99ti1gh-antaneous force. The ball hits the bat with i t1 - yyh9v9dcej.;bgan instantaneous force, whose magnitude is

State Newton's three laws.-h 2e joiseu.mb(sh ja1k +p+*

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eartm1gmo1/ vcumpb2o7c w1dzly . zm(4a/ h. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eart4zm/uwy2c/71gom(bo.pmvmc 1l a z1 dh?

  An example of a force which acts at hvit;,(lral7mru0w r qi79 8sa distance is

  Who has a greater weight to mass ratio, a person weix3sljd/xkbfh q944:kltxo yib. 7v*/ghing 400 N or a person weighyxio*f 3 ldbj th9/qvk:4lb/4xkxs.7ing 600 N?

  A stone is thrown straight mh pemy9-5579:,f iqli5ryky mcfi )eup. At the top of its path, the net force acting on it ym5 l5: 7yrkpmhme959i-eq ic f)i,fyis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samekt82gs*10bo i e) ubatgh* dh*4s5tvf height. Ign)kad tb8tb 0h vge1ushg 4*s*2tf o5*iore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitieqb tq7( ey )fia35ojw;*p2kgg s. Whichfgy73 bo(qpki5; w2t* qg)j ae object experiences the greater force of air friction?

  An object of mass m is hanging by a st aqvu+k8boovp)v,4n/4 4j gpuring from the ceiling of an elevator. The elevator is moving up at constant sb /o4p ap+vjuk4)uqnv8vo, 4gpeed. What is the tension in the string?

  An object of mass m is hanging by a strinvly76fp whb/ 0nc2,tng from the ceiling of an elevator. The elevator is moving upward, but slowing down. W nyblc0n6 2thw fpv,7/hat is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk is3b y tsjk/44o uu,,gwmp3 nh8a

  It's more difficult to start moving a heavy carton from rest than it ipbej:y *hm 2m;kn d,s,s to keep pushi em*p,:2,hdm ;bknjsy ng it with constant velocity, because

  A horizontal force accelerates a box from rest ac1ks 7aywggc1 g7m8(vcross a horizontal surface (friction is present) at a constant rate. The experiment is repeated, anggw1 7gkv (s amc81y7cd 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 ii/ejcu3p:cgy.;k-9q agyu 3 pd2yek0nclined ramp at constant velocity. Thus we can deduce th 0 ua-g 2e3yikpyc;yc:k /e3.jdqp9guat

  A block of mass M slides down x5h0;tdol wk- a frictionless plane inclined at an angle q with the horizonttlk x-hw; d05oal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclyesrt 0tyxzt 7(:hpza2,0b,i ined at an angle q with the horizontal. The normal reaction force exerted 0s2 7t,:bt0hazzi(,tpyy rxe by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclizh8u;2 tyad36yl)clfk d h- ;tned at an angle q with the h2-) z6dfat38 ;ytklluyh; hdcorizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simko2e. / bhfwe* t0t.maultaneously on an inclined plane that makes an angle of 30e witho . 2e.bwft0hket am/* the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionlesswy9b6 )5q5gexclut(dh / u2kx surface. A 16-N force is applied to the object, and it accelerates athxe(/uu65 cbk9 d2gyt x)5 wlq $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accely, tb0.sqt6.nt o8owcdrgj 5* erate from rest to 27 m/s in 7.0 s. What is sc tt6t0yb*o. r.5wnjg8,d qothe average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed lq)n5fif6d.*lvvg ,k of 8.0 m/s in 2.0 s. What is the net force acting ong*v)v5,kif6 nf.l dl q the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s a5 2j6sojr o,trfter trave5t or62 os,rjjling
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 7;j7 .jhv i/yj.ivlrpopi/qviwr; 4 010-kg mass from restj4hqv;il/ ./jwi 7iyij07rv r p. pv;o,

  What is the mass of a person who weighs 110qa d xbk/52w5p lb?

  What is the mass of an object-z;0q+y hvq il that weighs 250 N on the surface of the Earth where the acceleration due to y q+- ivhzq;l0gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earthwgm+.d f/ zp0d. What is the mass of the object on the surface of the Moon where the acceleratz0. /dg +fmpdwion due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object u/l q qq-bil1+B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare th1ulb q/+ ilq-qe masses of the objects.

  Sue and Sean are having a j ;m3 dwrp-(sj0c-ni apb ,o2ntug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N forcj b;iamjn0w-2cdr-so p 3n, p(e. What is Sean's force 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 actqffqj gu95k ho- 8wl;vo xh8*5s on the stack, and it acceloh g flhq*oq85;wf9x-8uj 5v kerates 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 elez +aoh5ji-qw9vator. What will the scale be reading when thejoh- i+5 aw9zq 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 isqq 9:a93ru lsb 60.0 kg and the eq sr9l9 u:ab3qlevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides op8e7)o)4gp( to- g emp(vzo ain an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upwap)a oo4g(8(pgevz o) emp7to-rd 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 mag,hi :qhe g-ll6nitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of thl, i-hgq:e6lhe mass?

  An object of mass 6000 kg rests on the flatbed of akfwk h )o895 o:ibbdp)u fi7;u truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Wib58df i)ukwu 9 fbp;7)kh:oo hen the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests nn1ohe-ys ypz 3k.1+ xhk;c7 t;wa +ie3mtck,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 15 m/s, what is the minim3; i;k,hkn w3pt-kyhc m1es e.aotx+n +yz7c1 um 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 = 0bhe dun-u vw3i48h. p9.40 kg, what is the magnitude of the acceleration of the system? (Ignore fric8ip -vh3w.h ubden4 9ution and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =*cc 7;vuqwtx(iv +tc ; 0.40 kg, what is the tension in the string? (Igno( ;v v7x cq;cic+ut*wtre friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 1001( u )jz5rc (jpaeky2e N in a directijpckue)5raej1 z2( y( on 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 boxh p11zlaw8w:btw ;8p t of books on a smooth horizontal floor with a force of 100 N in a direction :8w 1lza1w;8pbth ptw 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 100 N bau,f p7ed0mf0k/z1mt7 q sx 4is supported by two ropes as shown in Fig. 4-2. What apux4f k,bes m 7t0 qa7fd0/m1zre the tensions in the ropes?

  In Fig. 4-2, if the tensiono oh.20gt4l0yb hjpz;:x kit9s in the ropes are 50 N, what is the mass of the traffh0 ikb;0h otz.g x2ojtyp 9:4lic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sq ejjh//9mss gjmq7(lql/c( * urface. (See Fig. 4-3.) What is the acceleration msq j(elj s9 m/*7/cg/ ljq(qhof the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlueoi, ub4 (/ipess surface. (See Fig. 4-3.) What is the net force on the morou bi,(e/p ui4e massive box?

  Two boxes of masses m and 2m dqd ;nnqw*0 ,eo vmt5+are connected by a rope. (See Fig. 4-4.) If the forward force on the more5 oqn ndv*dmeq0+;,wt massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connectao9k at9( dq+mn v7u4ved by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accelera 4q ku9(dvanmv+a9t7otion of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fif5y 51fgh9krw g. 4-5. Box I of massf5 9gf rky5hw1
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 a/ )t pint:z *-ip+jexfrictions between a 3.0-kg box and a desk are 0.40 an/ xp)tnepi *- tzaj+:id 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 *,mz onzw.lqtt z)g)3 wood are 0.50 and 0.40)z ozlqt3 mgwt.n ,*)z,
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 w1mmtcq 8 w,h:in the +x direction. It slows and comes to a stop with a qc:w, 1htmw8mconstant 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 pulfhw098fothd.+w0u5 xaft6 b wled by a 5.0-N force. A 3.0-N friction force retards tu0how +faf9x06tdwb 85 .fwhthe motion. What is the acceleration of the object?

  A horizontal force of 5.0 N acceler 4buvm8u2zbe n29s/msates 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 an initial speed of 10 m/s. It slides 5cry pui)jbr) ,a/ ev) f)z**qk0 m on the ice before it stoi/ )j,r*zbfey rk) ua)v)qp*cps. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigatianim - pm/96fuon of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the ca/-m96mu fani pr'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. 4-6.*,grbxcpi;f-b o hn y7ief771 ) The surface between the more massive box and the horizontal surface is smooth and -c;xfnb b1 7ygrh7i7iofpe *,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 less massive box?

  Two boxes of masses m and 3m are st, w 2t5c gn(1r0qmxlljacked. (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 nw2q 5,lc1nx(lj mg t0rot 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 inclnn0+s/wq5 i 3 hj ukjfm7.4yndined at an angle ofm7i3kysnuj h jwnd. 5 0f/4nq+ $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of6. 5ph*ggvlz r $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smolqqv8c7p-, xj oth 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 as w 14hua:qe)jn 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 r-7) u8k ld.1thrji abgf4ys 1inclined plane, at a constant velocity of 6.08rd4iubt)j1 1. g r-7shlafyk 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 3 wi8se:zuapb+; bdtswvf+9+ slides 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 /. qb:dz3fv,gl8rqj r$37^{\circ}$ 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 sur kgv)*d.vvk(j face. The cable attached to the log makes an angle of)kjvk(vv *.d g $30.0^{\circ}$ 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 8sbri i(9*2sgf)ikv/ 1hl cmxrest on a rough inclined plane tilted at an angle of 9 1hik8i/mx cls(bsg )vf*2ir$33.5^{\circ}$ 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. 7:++fgotunsn The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q.gn+ sof: 7nut+ What is the coefficient of static friction between the object and the plane?