Which of Newton's laws b( /d;p1l63l spqbyve-kdd9c dest explains why motorists should buckle-up?

  When you sit on a chair, the resultant force (t/w(kznui1 d on you is

  In the absence of an external force,3jvzt +c)96ver( ykyv a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddeslah3hnj*6 hc51 - goxnly turned off, while traveling in empty space, the starship will h65nhh3osa- xc g1*lj

  A rocket moves through empty space in a straight liv)vatjz+0*9mb45 n.fes u sh(b7g:xag y6lzb ne 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 sustain i gbjts.*v5u 9l:sae gh 6m(nbvaxz0b)z74f+yts motion is

  You are standing in a moving bus,)pkvt q/ xe51a facing forward, and you suddenly fall forward. You can imply from this theq5kxp )v/1a tat the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwar8g6c/j:(prg+rnf3pow ,l wlv d as the bus comes to an immediate stop. What force caused you to fall gw8g+p:p ,vlj3c(r/ wrl nof6 forward?

  A constant net force actee8sk+7 (:t6 t)hzueyi9. pxpi0akex s on an object. Describe the motion of the object.

  The acceleration of an object is inversel y j+(tv z+g(bfryqw s*.g.9xfy proportional to

  A net force F accelerates a mass m with a5eki0j4(p d; my6u 2bveto:an n79ffrn acceleration a. If the same net force is applied to mass dn:pm;fy6i f9r5b0tu4 a kje 7o(en2v2m, then the acceleration will be

  A net force F acts on a ma.x(sr ,x 5ern1d1f awdss m and produces an acceleration a. What acceleration results if a net force 2F acts on mass 4m?x.r,(nd51efrd w1sa x

  If you blow up a balloon, and zdxtksr /- a7+gw sj5f:-0gjcthen release it, the balloon will fly away. This is7:x-gk0j+srj gs twf-c/za5 d an illustration of

  Two cars collide head-on. At every moment ducco sut. e0 f2hd:7c-jring the collision, the magnitude of the force the first car exerts on the second is exactly es.fco -dce 07 uj2ht:cqual 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 you:b+tov fu f;z) wit;z o:fbu) +vfll

  Action-reaction forcrirt vugq nh-7j94;o0es

  Action-reaction forces ar vxygw7 b*wiby)/4u/ a 0q+dlhe

  A 20-ton truck collides with a 1500-lb car and causes aetoi kh8 m0xr p(h)y;6 lot of damage to the car. Since a h yoh (tr;m)kp6ie8x0 lot of damage is done on the car

  An object of mass m sits on a flat table.-le2i54k */ksd+dbvnl2buu b2fs z) w The Earth pulls on this object with force mg, which we w+ldns22vb k/ k5u*zedbbu-2)i ls4fwill call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by mfsi+n-ujgsr )q;0(u nfh jt14eans of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the ur)nih 4fjs;ntq1s(j0u +fg -"action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous fo *sgw*smke9 6zrce. The ball hits the bat with an instantaneous force, whose k6swz9 msg*e*magnitude is

State Newton's three lawtl* ;pr- c+zqibwvv7rf: mo*7 s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earc2(-8aaa07(alh*xu zdcrom mth. Which of the f 0 a*8z c(l7xhu-rmcmoda2a(aollowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a forcfsuhu:(+9 (6 fzocx9nss -i fke which acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a +wyp1j*k) 3wpi*g,tcr ddir6 person weighing 6p icg*wid6*3 w),pjrdr1ty k+ 00 N?

  A stone is thrown straight s3r xwt 3g4sbf,. ezz0gnyb0* up. At the top of its path, the net force acting on itw 4xbs0bgn.stfezzy33 g0,*r is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same hp7pmw4 e*uk sbav2) (oeight. Ignore air resistance. Cou ( )aob*7wppv 4kse2mmpare their accelerations.

  A brick and a feather fall to the earth at their respejvx)xr*2s/4f tyyr6active terminal velocities. Which object experiences the yv/f x)4jrxa 6r2s*tygreater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. The;z;o)mb 2wpe o:c* pdf8tq2n v elevator is moving up at constant speed. Wh:;wz c8d;v pb *noo2mfe)q2p tat is the tension in the string?

  An object of mass m is hanging by a string from the /.0vzo )gjh( s +okfjjceiling of an elevator. The elevato.z0 fjgsv k)(+ooj j/hr is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on ann:j a4tda8)f t icy sidewalk is

  It's more difficult to start moving a heavy carton from re*n)g1 xm hous*q)aanr 9:qnl:tz hnr:j -;of-st than it is to keep pushing it with constant veloc- n a)mqtrzn: jf-n1:*los)g*qh uhnxor ;9a:ity, because

  A horizontal force accelerates a b8 ez1 eabe7f)1jzd9 tvox 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 the horizontal force is doubled. What ha1 btz7aedj8 ev 1fez9)ppens to the box's acceleration?

  A packing crate slides down an incli()v8:8*krpd a:.mgufc4fdce q opnv:ned ramp at constant velocity. Thus we can deducu:ekcf( :cdv.8 mqp p4rf*8ao )dvgn:e that

  A block of mass M slides down a frictionless pla fxzvm,u(lh9 5ne inclined at an angle q with the horizmux5hz lf9, (vontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at ,m+3y)kg 2dli7 a)tuxqrwt .m an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directedm td7ky .2xgrmti+)u)lq ,a w3

  A block of mass M slides down a frictionless plane x3d,z lm pa2w)inclined at an angle q with the horizon a2pmlxdz 3,)wtal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released ss * 59xucapy0k2d;iu iimultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration a*dix ;ayi9u c20sk5up fter being released.

  An object sits on a frictionless surface. A 16-N forcev d ;kf.hc5crr,-m6ci is applied to the object, and it aci c-r k5mcfcr,d.v;h6celerates 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 3/g.y, emshhf 4/ ttimm/s in 7.0 s. What is the average forward force on th fs ., e43hgt//mtmiyhe car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s7s(5z) )kwxuy:xfssv in 2.0 s. What is the net force acting on the b()fwxus7vkx5 )zs:y sody?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0*ly(ai*q 3 bql m/s afte bli*q* yl3aq(r 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 bu ix,(i3c4 kbthe same force that you push a 10-kg mass from rebcki3uxb i, (4st,

  What is the mass of a personl rbqn u)5qtpsk9c5dxog ;;t1m5s9 6s who weighs 110 lb?

  What is the mass of an object that weighs 25qq/a g1)zx bgz()kn1vg 5c 1yo0 N on the surface of the Earth where the accelera/g1z(5q nq)v yggbaxkzo c11) tion 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 o-bpc fqhc01 .un the surface of the Moon where the accep u chfc0qb-.1leration 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 thoru5f3d12t)q,v m ik,cqbm:de Moon. The Moon's gravity is one sixthod35qcmqu2km)b :tr fv,,1 i d of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-9n,o+zm)a*:)v z5tnxmc la fm kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceleratmncom95fzav t+)a:) x,l*n zm es toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. k a .*xx.h(ww +eahr.m A force F acts on the saw..xk( e+wr h.m *haxtack, and it 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 t qo3xx h6x9 n(qd- d(cs+vhe*elevator. What will the scale be reading when t +3s(*d(e o9qv6ch-xxhdt nqxhe elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevatorp; yo9z9b/b0)u,zyh o*zaobz. If the mass of the person is 60.0 kg and thehzb; zp* ybu9b/ y)o,azoz09o 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 elevatorfjz6u 0 ub.p*( gigag+jk(of 6. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration 6o0 jpfbkg (fgja i6*.+u(ug zof $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces 6qxe oj0 (wls.act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is06loe qjx(.ws directed due north. 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 kgd;h.7 t fmh/4mi6 )8a s+kfaopwxxdc8 rests 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 minimum stoppin mfhca.dh8p;d/ ki x846mtofw+s x7) ag 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. svb.:*p9.y7pz b u da3 n (jgvgdr0)lu It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Wv(vl7.0rn) *y3b usu.b dagjp zgpd:9hen 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 sh ba0 gdf8obdg151etn o1z,azw *1fup4own in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of theb1 1 1o84pt nu0afo* dgd5a,ezw1zfgb acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg a+8br9lcl j4 *mg-2ge:l5k 0s qmbesh ond m = 0.40 kg, what is the tension in the string? (Ignore friclb5rgl4-hs o smk98:m+eq gc*l b 2e0jtion and the mass of the pulley.)

  A student pulls a boxc,yz(d s+qi v9u128hcy oi. kd of books on a smooth horizontal floor with a force of 100 N i8s1+ki.d( 2uvy z, cyd 9hociqn 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+jaca0m 20h)x xnyd;spo9as f i)6 d;g smooth horizontal floor with a force of 100 N )y 0s; phd +micdo9sn x0)2aa6ajgfx; 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 the box?

  A traffic light of weight 100 N s:.o v fhoq0u3is supported by two ropes as shown in Fig. 4-2. What are the tens3 q0ofo: v.shuions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of themm5 z ck+pr;2p traffr+z25mpc k;m pic light?

  Two boxes of masses m and 2m are in contact with )e.wjl okmx6+each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more m eow). +mx6kljassive box?

  Two boxes of masses m and 2m are in contqcd 8x hy4p--f bl4ry7act with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mo drcyp8 q-yx44h7lf-b re massive box?

  Two boxes of masses m and a mjqs :u,qz;a1d)bzdi8 5bk :2m are connected by a rope. (See Fig. 4-4.) If the fo j1duba5q8, b:z:ma;s q) ikzdrward force on the more massive 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.) Intw5n7 ubq3j (f the forward force on the more massive box is F, what is the acceleration of the less m73(5 twnuq njbassive box?

Two boxes are connected by a zd5uxhi* + pb7cord running over a pulley as shown in Fig. 4-5. Box I of m5 +xh7u*zdb ipass
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 kun rjj35l4-zv6 vfgk-yy :a,zinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net forcu k--gvzj:ayn6 ,vz354 jyrf le on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic ont0pficegr2z5 ao j14,yfy/ :y wood are 0.50 and 01 iyty2 oyfjacgepr/45f0z: ,.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. It slows and pcqd4/j re1 d0xoe ui2( .09cb*iknhs comes to a stop wi( .cqd/i94ukrox* h1s ej ci2d0ep0bnth a constant 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 os ;/:6n pja5k euj8kv x813qwq,z oxvpn a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What 5/oz8keqk:j p3xvwnq;a ,jvxs 861p u is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at nvp3z 8d2m/rqz*.; 3mfwjcx ka 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*8mimsl;khb.k 7 t2yf e)gce6 an initial speed of 10 m/s. It slides 50 m on the ice before itics.te*b;m) yg62 7lh e fkk8m stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 vls /- 0y1l c*haa:nrvm long. They determine the coefficient of friction between the car's tires - vlrlsah*: nycv/a 10and 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- oe5-ksu:ei x1.o k(qi6.) 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, wheqki x5e:is1o.u(- ko at 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 be6da*g*ca54vrgq u m*rt-x sa-tween 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 slidera- *4*m-dc5xqugt6a v*sr ag 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 iqge/g(r+h3 / brd0ua snclined at an anglerg /bh0+e rqud(sga 3/ of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hiljgqmaq9q; w3;in/ cn kgi4s56 l 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 pla.uai5s ;b;d 3 +w ajujs2tv+ehne 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 smo8xkr- b0y0dxin:3hc olq d/1n oth 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 -sa,oee3o , urplane, at a constant velocity of 6ar-ou3 se,o, e.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 down a rsgu9ajrid dd /s l.m 5x xl1z956z)1ljough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slig-l +(, n*7+g)/arv lfl j5hmari lefgdes 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 log weighing 500 N alon+nj iv+nm5x b9icmkk--ml**h g a rough surface. The cable attached to the log makes an angli+nkm*9*-jbvhn+xmi c k-lm5 e 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 i,by)sa .c(uxfrom rest on a rough inclined plane tilted at an angle of iabxs) u,(.y c$33.5^{\circ}$ 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 ann:7sks1 7u ihy z1eqa2 inclined plane. 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 friction between the object and theiq ya7 1 zs:h2snuek71 plane?