Which of Newton's lawsl:9ovgg6z;anxuuu/ 6pn8 -udm l7e.twb )x 3 v best explains why motorists should buckle-up?

  When you sit on a chair, the res+qt uwj s l o/+6m3n(/z skvosnq 752aczw7f;lultant force on you is

  In the absence of an external forc)846o g zk kiyo fi,8oau(nxl(e, a moving object will

  When the rocket engines on the smxc +nz sj( w25joc*;wtarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, thjx;w+ 25ocjc s(wzm n*e starship will

  A rocket moves through empty space in a straight line with constant speed. It 9ne5ksw4m; hd-w2sbl i9,al sis far from the gravitational effect of any star or planet. Under; b9m-e a 9s,52hkdwlwlssn4i 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 suddenly fall forward.:svavmxk+ /(l1b dn 9p Yab sx+9mnkp(1v d:/lvou can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forward ,;4mmnp l r;kxr.nu c+as the bus comes to an immediate stop. What force caused u4mrn mp.;+ knxr;,c lyou to fall forward?

  A constant net force acts on an object. Describe the motion;rm 8ras (:eat of the object.

  The acceleration of an object is inversely proportional t qz-p *h;msa4to

  A net force F accelerates a mass m with an acceleration a. Ift i26ev ww4/nc the same net force iv4ne26/wt ciw s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratidr*g( uz wsi5 22e97yjrxog.l,onc1p on results if a net force 2F a7o(iylwo,ge25cpj 1xn.r r uz*29d g scts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wiio8a8;/qojux-i) ,jqlkjo w. o p;b 8pll fly away. This is an illus 8)pb8ikqao.j; x qi l ,8o;uojwop-j/tration of

  Two cars collide head-on. At every moment during the collision, mm,:z 3l,ot+*spmq hnthe magnitude ofo,mptq ,sl + z*3mhmn: 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 of

  If you exert a force F on an object, the force which the object exerts on youk a6,ytv5 zr brz)fjl7 qg17+l witr15 r a76jyqfb zvg,)zk7l l+ll

  Action-reaction forces5 bxprbczo 8yz.+6aw1

  Action-reaction force4-xxuvt vfa 5ql73e6ezm 4:pr: hjzp4 s are

  A 20-ton truck collides with a 1500-lb car and 04 koy+c j)6fyvbd5cdvm z 2w3causes a lot of damage to the car. Since a lot of da c5o by4fv )2m 6dwycdjzk+v30mage is done on the car

  An object of mass m sits on a flat table. The Ea :6 tbbwmdd892yvk)5t(rdztc rth pulls on this object with force mg, which we will call tt5dv r 2y:tb(kzt cdmwbd86)9he action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Th6 cmeb-3w+lv ee Earth pulls downward on the toy with its weight force of 8.0 N. If thivl6w3 ecb-+e ms is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous x1 v+fm8iw4sc+yoq ; tforce. The ball hits the bat with an instantaneous force,mcqvy84witxso f+; +1 whose magnitude is

State Newton's three /cl k4 ; m6;m*/(wkxfi2thbox)z)u pv*erifk laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. h x4(io7lcta )z; 9azr Which of the following is true about thx4olt aha9)c7i ;zzr(e mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance 9v mp1i,vh2i*eh8emb is

  Who has a greater weight to mac-xwpk9z+ j:;u e2ov4)pdfc i ss ratio, a person weighing 400 N or a person weighing 600 N?j: k4;+p-)icw 2 u9cpd ovzexf

  A stone is thrown straight up. At the top of its gvu,6e*p:aak path, the net force acting on it ,*p:aa ekuv6g is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from tir +w,uf e9ak1he same height. Ignore air resista fu,wka9i+ r1ence. Compare their accelerations.

  A brick and a feather fal55cbeq6-sn1nuit xzq. h9ig7 l to the earth at their respective terminal velocities. Which object experiences the greater force of air f-nhnb6uezq qic9xts55 .gi71riction?

  An object of mass m is hanging by a string from the ceiling of an elevator.z 9*4exftb gmqseg4 ;f/jx,iai o 0,;e The elevator is moving up at constant speed.s/aj4 xf,;b,g0z9t4om *qigfe ee xi; What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of anjgnbub0io2lx + e9 ei7e*5dh8 elevator. The elevator is moving upward, but slowing down. What is thiij*7o0dee8 eu 5 bnb9x+g2lhe tension in the string?

  The force that keeps you from sliding on an (zw9yy63s8 hq2+pgw)qg kxnh icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is t++-*q oxmj0e jw o,p/.fs qzv6dyk:cwo keep pushing it with co0 jmpe+x:*-/ofo q+yk ,qv 6sc dwwj.znstant velocity, because

  A horizontal force accelerates a box from rest across a ho yzam1cz6;e.kk0 8gstrizontal surface (friction is present) at a constant km za6.g0t8;yk sc1ezrate. 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 inc;*ik/nm 5a2ogsca9t4f r;jo glined ramp at constant velocity. Thus we can deduc jnt;cr*gfkomai /92og5; a4se that

  A block of mass M slides down a frictionless plane inclined at an angle q wj;aj*1s/ c n gwi39pw8gx, szxith the horizontal. The normal reaction force exerted by the plane on the blojp/;8g a,*wz9iws xxs 13gj ncck is

  A block of mass M slides down a frictionless plane inclined at an angle q wit7phw9 oo0efh6h the horizontal. The normah079f oopwe6h l reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclr4m(7*gfr.tfg n g0ik ined at an angle q with the horizontal. The gravitational force is dire47(kg*gt. fr0fgimr ncted

  Two toy cars (16 kg and 2.0 kg) are released hp:e;im-jx; vk6: p yjsimultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration afte: ke vj p;i-x;h:pj6ymr being released.

  An object sits on a frictionless surface. A 16-cn+f/gp.mecx w;nx14 ,u vbr7 N force is applied to the object, and it accelerate1 numevp/;w47,bc xgx.rfn c+s 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. a9 ea+lqz.l1 4q2x flu What is the average forwara+ ul zl1flx.q4a9q2 ed force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of(d lm5 fw+xzw7 8.0 m/s in 2.0 s. What is the ne(x ld fzm5ww+7t force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed o 0ma fzxt36 comumlo/(y j79:if 50.0 m/s after travelil yju(f7mm 6z0txo:/3 icaom9 ng
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 forcgg qi9fx*1bba byl4a i:rb*)t+cp8 8ae that you push a 10-kg mass from rest,b 8i*4 ac fgrx9+1alpt qb)g yabb*:8i

  What is the mass of a person who wei4 rtx; 14zv 5z1nc e0jgnbly 4i tg55g4z0iaojghs 110 lb?

  What is the mass of an object that wei qs7irkfh3;p a2rty02 ghs 250 N on the surface of the Earth where the acceleration due to g2;aq h yrr0f7si2 tkp3ravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. t* s 9ubr0i 4x)kwq/hof9 t,nfWhat is the mass of the object on the surface of the Moon where the a,qftk )bufnrw*h 4/tsx0oi99cceleration 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 Moonyw4y q a;/cei168ncgi . The Moon's gravity is one sixth of Earth's. Comca 4;q ny6c1/igiwy8epare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of )vh o1 ix4fgt)a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's foiv o )xh1tf)g4rce 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 acts ocw( htfa3ar). n the stack, and it accelet.f) arw(3 ahcrates 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 6hgz2jygkh 6+in an elevator. What will the scale be reading when the elevator is acceleratingg+g hz62hyk6j downward at $4.00 \; m/s^2$?

  A person on a scale rides in an eled2mg/) +zpn glvator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration ofmzl d+/2n)pg g $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 k 9 5h ppqpl3:y4hxknb-kmjaaav7xq 74m;.hn8g and tj:b48 .h ahn;pxpa 4-vqx5 hy al7p397mk nmqkhe elevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act ontd(tk 6hi m 7ou7crr+.3q jzp,,jxt p5 a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude otuj73+, ,.r pimxz7(h6 tqo5 k cdtrjpf 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flactusa )f5t/ s69 liyq8tbed 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 distance if the load is not to slide forward into the sfi tu9c/)ylq tas86 5cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is y8 zkmitrp12 c -) iog(be1xs1held 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 thecot1x8 i yr g1ie(-mb1szkp)2 minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1 q7gpp4d8gd+e , if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass+de84pp 7 gdqg of the pulley.)

  In the Atwood machine shown in Fig. 42rj w oe zmg7-,kgv0(s-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and -k rm7ge w ,z(og2vsj0the mass of the pulley.)

  A student pulls a box of books on a smooth yb:y ly+d;9a/dtn ts5horizontal floor with a force of 100 N in a direct:d/n5 bsy tyy;d+tl9a ion 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 for26pbfmhav v os2-/t8x ce of 100 N in a direction of 37.0e abm /6xtvp2hs2o-fabv8 ove 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 suppp)kb+(0c; 1sd;9pj vp rl ubxgorted by two ropes as shown in Fig. 4-2. What are the tensions in the rop r9ck u;g;xlpd j0bv ()1pb+spes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, whatv i.ng mz12/h bu9mgv6 is the mass of the traf.9z1vv/g m u2g6nhbmific light?

  Two boxes of masses m and 2m are in cli l;r,cd78m xl7aa.sontact with each other on a frictionless surface. (See Fig. 4-3.) What i 7,am;.lalr8xl sc7dis the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless s5i hsm7l.7;+ d;azpip )zvs gp4fy2s surface. (See Fig. 4-3.) What is the neti2g)s;.lssp dp 54h7pa+ yz7zm vfsi; force on the more massive box?

  Two boxes of masses m and 2m are connected by a r8zhuk/ukd6pn94 ag :sx/yk 8r ope. (See Fig. 4-4.) If the forward force on the more massu68 ukk:d a98 4pyx/rhszgnk /ive 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.) If the l)n .wi;d nzaud kzm132b;u i pblgw.1v(;9 ttforward force on the mo 2b9l bmttlpvn 3.ud 1zz .ugw;d;;(kina wi)1re massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running,0+ 27qiqt 3 fweagicd over a pulley as shown in Fig. 4-5. Box I of c3, if0idq7w aq+et2 gmass
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 f,jxb4y+2eb t box and a desk are 0.40 and 0.30, respectively. What is the net force ,xj2b4 b+ftye on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and mviwnl:vw3-c kw (g66 kinetic frictions for plastic on wood are 0.50 and 0iwg vkln6 :(3 vwc6wm-.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. xxa9 fik0:9qyIt slows and comes to a stop with a constant acceleraty9 i a:xfxk9q0ion 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 horizontahnq+;(9 ox j.nthc6;,ztkwm ol surface is pulled by a 5.0-N force. A 3.0-N friction force rej 6q +tn;z(t9;wonm kh,.xchotards the 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 rate ofeqjulzki 6 *, v5(l+qn $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is give0kj7ypy-m c *ch .l-jen an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coeffyl* y.jm hc-ke-p cj07icient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skijn p:,,m(7dsoco g pa4d 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 whe(4p d7o coa n,jmpsg,:n the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fia4unp.nqk4(myy)pt fd4( b v7g. 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 static friction force on the less massive b7kby. tn(uy(f 4)4pa4 vndmpq ox?

  Two boxes of masses m and 3m are1xj9mflp e 5dgc f sp4c9i7t4, 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 slide on the more massive box, what is thexc 9je sf4p7 licpg5,19mdf t4 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plani2qj 7jyq (n1ge. The plane is inclined at an angle ofjn1qg 2y(7ijq $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat rksn (pk bp6vc/*g4q+hill 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 al g.k4eg(g/m a cz*.jc,gx8un smooth 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 plan*k( kl0.v x0)e-yrnfmsah/ vie 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 constanyx8ow*6vg5tq6kk pdbp0 l j5,t velocity of 6*o kkd lg8,y66w5 0tjp5xv qbp.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 dowmyp hja, 82+g jh.u/1 0rkwtpwn 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 downjok 6y9t-hway arc:u tb- r211 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 attacqlm+a,3le stql4h62onrp1 r ;hed to the log makesn,2q4 s3 aqlml ;pr6tlo1e h+r 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 rzdalx8tg6v k58;/wnc pl8v2gehz 7-oest on a rough inclined plane tilted at an angle of 8o dvl7/-xgk pwt evaz;8hc5z8l2 6ng$33.5^{\circ}$ 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 inzn6x6z .e9 nihclined plane. The angle of incline is gradually increased until the object begins to slznn6.x zi96e hide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?