Which of Newton's laws best explains why motorists should 2.;hmirveiq*kc-8c , ki n ea0buckle-up?

  When you sit on a chvs kcplz7.3 a4air, the resultant force on you is

  In the absence of an extero7 4 ipmgdpz9/wq oo(s i(:-zvnal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly mf6+n df )m3dw6ohv1y turned off, while traveling in empty spacem+owmd vy63n1ff)6dh , the starship will

  A rocket moves through empty space in a st*l kx7rolep2 (raight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sxk7o l(* 2plreustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall3mdo0b pxj j*f3,1oj x forward. You can imply from th mo3xj0p1djob ,* 3xjfis that the bus's

  You are standing in a moving bus, facing forwqqph4 tjjym *3w f+hx:ev-:c2ard, and you suddenly fall forward as the bus comes to an immediate stop. Wh-f3j: *h+qw p4jhymxec vqt2 :at force caused you to fall forward?

  A constant net force acts on an object. Describe the motion 9 )jomvzw3g* lh 5y)uqhno0y ,of the object.

  The acceleration of an object is i o) )nc*ost1gdnversely proportional to

  A net force F accelerates a mass m with an accel,28*b7(rwzi+ cmks;aqic ddceration a. If the same net force is applied to mass 2m, then the acceleration w+dcmc wii2(bra7qs c *dzk ;,8ill be

  A net force F acts on a mass mz3e ajx4w 0-ka and produces an acceleration a. What acceleration resukw0jae 3a-x z4lts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release i p9azkb1y xo50t, the balloon will fly away. This is an illustratia51zoxkp y09 bon of

  Two cars collide head-oywf, o,jbzq,l85,z a fn. At every moment during the collision, the magnitude of the force the first car zqjob,ay5zw f l,,f, 8exerts 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 whi7e0obszyi;w2 yj le/:ch the object exerts on you willbw zi2l ye/y;0e 7:ojs

  Action-reaction forc2 2s 9z5ejmui(v c1i1ict jla9hl3;cmes

  Action-reaction forces 7*huhbezf 63v igx: /nare

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the:03k )bpd 5awt2hp;sz z5 pjxb car. Since a :52xwbb5jk ht zpp3azpd0s); lot of damage is done on the car

  An object of mass m sits on a fla4; befnuv+ f70vvax,b/ee i:kt table. The Earth pulls on this object with force mg, which we will call the action/e:ikfb7 ,v uee+0 nxb;f4vav force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a stringuo:cl mdioh 72,y)md8k/1pfk. The Earth pulls downward on the toy with its weight force of 8.0 N1m2po:7 d 8,cki/kl)fuhy mdo. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The b7 qf*rpre -g,6rrhi-kall hits the bat with an instantaneous force, whorrpq g e*f, r6i7k-rh-se magnitude is

State Newton's three lawsnc. jlr(0x3jr 3rjw: t.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of thwec3ylak h.x qco-6,o)zr*gl(5hkf(e 6 gp; i e following is true about the mass and weight x r)po(( cgh,l ezgq i5 3oc6eafw6;- kh.lky*of an astronaut on the Moon's surface, compared to Earth?

  An example of a force 4qv oj6b0 s8s)ohgjig :osjb58c fu(3 which acts at a distance is

  Who has a greater weight to mass ratio, a person weig(diu jzp2 snme/ 2.(s4hrsgt7 hing 400 N or a person weighing 60tu .( e gnj7sprzmd2 hs2/s4(i0 N?

  A stone is thrown straight up. At the top of its path, the net force acting ossttra; 142 neeq/b ,tn it is/etn tr4 eb2s q,as;1t

  A 20-N weight and a 5.0-N weight are-d ,7v gdxot0e dropped simultaneously from the same height. Ignore air resistance.xv0o gde7 t-,d Compare their accelerations.

  A brick and a feather fall to the earth at their respective t sb:a+ s4.0za*/dzk:ax r5w 3 lkwfpxierminal velocities. Which object 0i:4 fzalr*ab5p dsksk.3/+ax: wwzx experiences the greater force of air friction?

  An object of mass m +t7k5nn +k+t l s-xqfqis hanging by a string from the ceiling of an elevator. The elevator is movin+n n-7x++5 qlqkt fsktg up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling 5fqwv0v3/6g omn b7x-h )sgmd of an elevator. The elevator is mo- h m/owx3 0vnbgq)6mvfdg75s ving upward, but slowing down. What is the tension in the string?

  The force that keeps you froms5:1fydmo 1o4qys3a e sliding on an icy sidewalk is

  It's more difficult to start w*8qmij ac6yk1k gk,yc+r9o 3 moving a heavy carton from rest than it is to keep pushing ik6c9q1 ko8 jkm+ycag3iy ,r*wt with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fr;ptiml /y24mp iction is present) at a constant p2i4; /pltymmrate. 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 inclined ramp at c4u4klt8r eet-onstant velocity. Thus we can deduce 4uelk-8r4tet that

  A block of mass M slides downt6lbrypux,ez g:et9 33gos i/ds 70b3 a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted:3e gio/ eds9,t7 3ug0 rbzxybs lt63p by the plane on the block is

  A block of mass M slides d g5+bf semx(kl*m)7 teown a frictionless plane inclined at an angle q with thmt*xlfe m +s)5g7 k(ebe horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides cphe2ojoy; .gq/*7un down a frictionless plane inclined at an angle q with the horizonjo;oe y2gun 7./chqp*tal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releasgee qc, )2c2pfed simultaneously on an inclined plane that makes an angle of 30e with t cfee2c)2g qp,he horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N fopb4k khd*(n27a; ufh krce is applied to the object, and it acceleratesd*47bnhk;ak2 f(p uhk at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acc:gft4)6*a:4 gzes lcj1go9z mt,coh /awxic5 elerate from rest to 27 m/s in 7.0 s. What is the averageslcz: ef/5* w:4chocig4 9g6a a gt)zjox,m1 t forward force on the car?

  Starting from rest, a 4.0-kg body reaches a qf*ywjg6 o-jw-q 9/stspeed of 8.0 m/s in 2.0 s. What is the net force acting on the -q j9j6oy/gw*w-sfqtbody?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s aftk x.0 ez:):zm+oggvjaer tra:)ek.jxz:ga+ zg vmo0veling
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 fxop.yv2 f+4nun 5n8 vnrom rest8vx25n n+4fn nuvpo.y,

  What is the mass of a perso+iwwn:(jp .5kvy ,h wzn who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the E5o*x b9c6wkdukk +u tokf,/k*arth where the acceleration due to gravity isuokkkb+fkc w , *x*5u6/ot9kd $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mn(q gw5l ofv)fkq;o)s z9jh3g2/0pgxass of the object on the surface of the Moon wh)w o3 l g0 sj (g2g/nhvx5z9kpffqo)q;ere the acceleration 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 thetdhk5duf2 rtd1kstee)f+4/6 Moon. The Moon's g)sddut+ hdtre5t4k26f e /fk1ravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a t bel6q4iu4asu5y2*uy. zxg0 oug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's foro*eub.u4y sy2al5u46i0qg xzce if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless sur: 8obits1lm 8jface. A force F acts on the stack, and itm 8b:1t8jil so 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 in an elevator. What will the v34s42ihbies scale be reading whenvs43isheib 42 the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevat v0f+isj(opr2lv n.7 sxip a4d-jz*4ror. If the mass of the person is 60.0 kg and the elevator accel2jjv 0 -ipn4rzs.*i+s pv (rafo4l7xderates 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 elevabagyw52w1 xj k79u*j a053m 3t qtriwvtor. If the mass of the person is 60.0 kg and the elevator accelerate19wt3j a5t w x2jyw 5ai*30gub r7qmvks upward 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. j)+)pzhnk, dx One force has a magnitude 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 accelerati)xp, dhn+z)kjon of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in i;s2z i6sv*b5cvb7j z 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 slid iiz2;v6b7b*sjc zv 5se forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It i jeq:++epp;jls held in place by metal brackets thjqp +jlep+:e;at 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 not to slide forward into the cab?

  In the Atwood machine shownest0b (t zj (8t9jjxa- in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the at j8b9tj zx-a( st0ej(cceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fl; k7f1m/bvlw ig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulwl; v /1lk7fbmley.)

  A student pulls a box of books on a smoothf cc0o10junz- horizontal floor with a force of 100 N in ujoznc0c f1-0 a 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 smooth horizontalhno(s *u xfd .5dbw+7t floor with a force of 100 N in a direction of 37.0e 7xwf tuo.d+(5n*shbd 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 suppov(znn6 q)5pfk rted by two ropes as shown in Fig. 4-2. What are the te)kfn(pzq 5 6nvnsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50kft52w:wydqj um qw 9.+a*t:t N, what is the mass of the traffic lightd+q.5w9 tkta y*2f w:wj:umtq?

  Two boxes of masses m and 2m are in contact with each othdu vi.dc0,x hm1m9:wfer on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the x,c 1 i.9d:wf0m uhmdvmore massive box?

  Two boxes of masses m and 2m are in contacb.1w;phdb lef*/nb p 7pxt5c0 t with each other on a frictionless surface. (See Fig. 4-3.) What i5;1pcbpx t be*dfwbn.7l/ hp0s the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.:e r* oqkl:ul1) If the forward force on the more massive bo :u ql*:r1keolx is F, what is the tension in the connecting rope?

  Two boxes of masses i25cswrp) 9d:gex,opyx k9j *3p isozf.u :p1m and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lesu ox*.s9fg9 rp:k1 ,): jwsz yppxcde5i2o3pis massive box?

Two boxes are connected by a cord running over a pulley pl7+xmhi 7d 4ts ldu1,as shown in Fig. 4-5. Box I of massd4dx,m7hl s+i71pu lt
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 iyb g/e*dbtk:p4gn )0s5)l cl a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the bog) kgpb50* 4ei)llnd yctb/: sx?

  The coefficients of static and kinetic frictions for plastic on wood are 0.507 wub48ul oz2u and 0.40 l8 zo24buuw7u,
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 thewjdzb.k 9 b+* dhd+9iy +x direction. It slows and comes to a stop with a constant accelddd9k9b .i zy*+jb+ wheration 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 pulled by a 5.0-N foh1 aq1otb :l;4kdh av3rce. A 3.0-N friction f:31hvlh1aq kbo4a ;t dorce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, + b)ix*+m v bil4 cxya.tf70idfrom 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 spe5nnyf qd zu7qy,di)99ed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient o un 5y9q)f7,y dqznid9f kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.m n p6 -skzv1ndo9ez.+u ;0ibq0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the 6z u e;pmd -b1oz.nnv0 kiqs9+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.) The surface betwe1 cjr .tc/eo3g(y:u7.gw1svyfvt, tr en the more massive box and the horizontal surface is :gc3y( ,gu.y.7c jvts/t1e 1r f orwtvsmooth 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 box?

  Two boxes of masses m and 3m are stacked. (f d6bze*e l l)gs6lg )f8ht4/hSee Fig. 4-6.) The surface between bll fh6) slztgd684/f* geh) ethe 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The planic 7 6mko56cfn*s;gtbe is inclined at an angle of ;i m66cc7*obskntg f 5$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat d(r5 0*ce(roswze cj(d :h)x jhill 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 a smooth inclined 7b x8cf,k58pt . z ;)a-kyisv8himzjr 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 smoothvts5pvuao 6dai0w:s;0 6c 8 qv 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 gr+scr19mci6p /u- yz/uh r (toi,:j finclined plane, at a constant velocity of 6.0 m/iz+tmjcu:is,p r/gy- f1hu ( 9 ro6/crs.
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 r2v xuwku0-otnq9x 55x8 tm8xslides 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 j g:bhwn (4v6ra 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 rouggfm s z5dd94 *;untpr0h surface. The cable attached to the log make m4d0sgp;utrf* 9z 5dns 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 q sp2h2ql:391e+ /db dbghovqa rough inclined plane tilted at an angle o2dq9deo1g2bv +hs /3p hl qq:bf $33.5^{\circ}$ 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 a;g9x* oke8 ly9ls6cs en inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which ;ylx8s9k l6gce *o9sethis occurs is q. What is the coefficient of static friction between the object and the plane?