Which of Newton's laws best explains why motorists s su4yk+)r)-/bikii zuhould buckle-up?

  When you sit on a chair, the resultmfm2*7qpjlvy-/ynaqa-cr:miyk 2 r - f jv *5,ant force on you is

  In the absence of an external force, a moving obj rv,jdm q *gwqe7 8pjhs(e17,ject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned o d; 6l 1okds ax*clnndnomkg4,-v;9k+ff, while tvd96dg+ax;nls,odm k n 1 -; 4*clknokraveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant d*al n(f zec2,t.wfo7speed. It is far from the gravitational effect of any star or planet. Underwf ao72td(nz f,lc .*e 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, an ug8u6(s:dch 0ri+lcx d you suddenly fall forward. You cangh6c u80 rid:cxlu +s( imply from this that the bus's

  You are standing in a moving bus, facing forward, axdcjql, 8)sn* y csc+*b9(fep nd you suddenly fall forward as the bus comes to an immediate stop. 89y*f)q,nsdxclpb+ c*sj( ceWhat force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objec)ol3i(--vz wxqq mr +st.

  The acceleration of an object is inversely proporyd/wt3l0 a as/tional to

  A net force F accelerates a mass m with an acceleration a. If wjjpc)pd;2e7e zr2,p the same net force is applied to mass 2m, then the acceleration willjd2 ,2wpp7)rceep jz ; be

  A net force F acts on a mass m and produces an((1f3j w*ondts+5auk dza*hm acceleration a. What acceleration results if a net force 2F acts on mass whad f*3tajos + mkn*5u((1zd4m?

  If you blow up a balloon, and then relh4ynw1k krs gosa v 42 olgg5;,h6,n+dease it, the balloon will fly away. This is an illustra s;dhnako+ gvks1gg54rn,2y6lw 4h ,otion of

  Two cars collide head-on. At every moment duringo wiiii wu(:1. the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of w .( wioiiiu:1the 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/f/w+ lxj7de v on you wiex/+ lvjd7/f wll

  Action-reaction forcev8p(qx .80vsz*1 uqex )l jpsbs

  Action-reaction forces aca1neb8 *e9wto2v+i +:gmn yzre

  A 20-ton truck collides with a 1500-lb car and causes a l5ezn a68 p/ypiot of damage to the car. Since a lot of damai6pnez/5 y8p age is done on the car

  An object of mass m sits on a flat table. The Earth pullp05ta9fkeja* ei 0ov1s on this object with force mg, which we will ei*9jvt ak10f0eoa p5call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means ko il0rr7gl nm:, */ ozxyzfy-(:udq5 of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction f yqlo,l5z7rn(udyiom:/- zkrfxg0: * orce"?

  Your bat hits the ball nhmm sg5qlz ;9l)7,xro,uq/ j pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneourh5q)z;lojs9lmmx 7u g/, ,q ns force, whose magnitude is

State Newton's three laws.bk0wg4lehb + (zdt.w-j ncdrq/l6yi 2.s1 s-t

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of thzmb4kh/)uw-uj +kc.he following is true about the mass a-/.c4mbkkz )jhhuwu+ nd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whichv vgxzxcnwyg9* tx( 9(6r0s5v acts at a distance is

  Who has a greater weight (eflqwde1l5sqp q9w/t8 . gt+ to mass ratio, a person weighing 400 N or a person weighing 600 qq / l wtee.twlp9(fqs+gd851N?

  A stone is thrown straight up. At the top of its path, the net force acting on )txwz wl2 im2am ,1,za1u 2s5r6tdqnm madr)twm2 qw , l1sni22t xza, zm651uit is

  A 20-N weight and a 5.0-N weight are dropped simuzxnzq:jlsa;g;,( . z:ho nq m5ltaneously from the same height. Ignore air resisno:;zm( ng js ;z5:x.hqza,q ltance. Compare their accelerations.

  A brick and a feather fall to the j i.r dsmms;u/ke(-8 gearth at their respective terminal velocities. Which object experiences the greater(sjem g.-kd/ rsu; 8im force of air friction?

  An object of mass m is hanging by a string from the ceiling of an e7sksju/ p:gsf.hap +6lkj;)sq 4xcn. levator. The elevator is moving up at constant speed. Whatu.):j+hg6/ kpsxp nf s47 ssa;. klqcj is the tension in the string?

  An object of mass m is hanging by a string from th zuq,7w:yuz*tl4rd :k e ceiling of an elevator. The elevator is :uqrk,ul:*dwy t zz 47moving upward, but slowing down. What is the tension in the string?

  The force that keeps ycdr2p xjy;ph,m7is( dg ;p,-zou from sliding on an icy sidewalk is

  It's more difficult to sn acd y-b6b;vef b j/+2v//caotart moving a heavy carton from rest than it is to keep pushing it with constant velocity, because-n6abv2 cyv/a; cb/+fobj/de

  A horizontal force accelerates a box from rest across a horizontal surfa5wd d/(,toss,zm 8 ozpzu(bo3ce (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same w mod5 (o3p os/t8(wsz,d z,zubith the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclinb5neq o:,,fotk4i rv:ed ramp at constant velocity. Thus we can deduce :o:4,it efqn v b5ork,that

  A block of mass M slides down a frictionless plane inclined at an oslc7slwa0(qm)vq g8e1d3 tq bb do50ot+.c5 angle q with the horizontal. The 8t 73l100bdvmqbl5 soo(5a+. cowgq sq)dtc enormal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclinedkp-v/uc-we sqko)v4a/h2 vkvph; ): a at an angle q with the horizontal. The o)pk hc p ek/v:q;shwv k -)v-vua4a2/normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down an)d27 tojvna+( -jmzp frictionless plane inclined at an angle q with the horizontal. The gravitational f(m v7p otj jd)-z2a+nnorce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on anjr u f2gak n)q8z)79vd inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being r28knrd)a )79uj fq gvzeleased.

  An object sits on a frictionles )4vs0ades phkyp.- o:s surface. A 16-N force is applied to the object, and it accel)v skd p4- hs:.oa0pyeerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest tpse(r/gjtm *0ahewrb bb ,/6+o 27 m/s in 7.0 s. What is the 6twmrha*j(brbb0 +/es/e ,pg average forward force on the car?

  Starting from rest, aja5(jj; 7cyls;xy*cszn5kpjgh l -32 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is tj*;7snc2-(55l cpyj 3j ka hjxy;lgzshe net force acting on the body?

  An antitank weapon fires a 3.00-kg rockt 3+ga:r e+whxet which acquires a speed of 50.0 m/s after travelin 3++rga:hwxetg
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 soun 6/6 -akfh) mai-j3lna (scu7jye1ame force that you push a 10-kg mass from reju6 ciu-n ana )k7jf 1e/lyo-m3 6h(sast,

  What is the mass of a personx)9hx a;qo0y h who weighs 110 lb?

  What is the mass of an object that weighs 250ug3,ryz;io toq5e v6: N on the surface of the Earth where the acceleration due to gro qu :5o i,v6gtr;3yezavity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of thef(io i0sv 8c1a object on the surface of the Moon where the acceleration due to gravity is only 1/6 of 0c8viaios f(1that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 /1 c;xtp2 lbpgb7e p8jN on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the pebbxc8jtp1 p 2;7 /globjects.

  Sue and Sean are having a tug-of-war by xur9b r7dubtt/0+x7ipulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Su7 xu0x7trrdb/i+9t ube at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. Ax;ig u.fig0n(m n5la + z(;jut force F acts on the stack,m gi x (l 5fgtujin.;0+azun(; 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 elevator. What will the scalk,riwo +07z,)nlgbaz .6 plv*fgg rm.e be re, )pz,nafz6l * glv.gi mbro70rk.g+wading 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 )f7ob(n 7jz64 lztidw the person is 60.0 kg andtz7j6f)l w7z 4d(ib on the 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. If 8whg oj,w(k;vthe mass of the person is 60.0 kg and the elow8;hgv, j w(kevator accelerates 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. One force has a magnitude of rqppek3 j 7jpvd.1 b628.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the massrjp7.p1e 6bk j3qp v2d?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in plamnj g5anv43vyqm+zh7 sy8-d+ ce by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is t4a+mm 8y +yh5snq gv-d7j3nvzhe minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of xm18edvpx5(- bt n6 tka truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is tram8n (-x5v tbt1xpe6 dkveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1,7gk+xidi.tbp8v(f r xag/-)j if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of tgig.8)-xp+kdf itarxb /(vj7he system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0/y0e vu q)x*x t8x ghlb5*o6qb.40 kg, what is the tension in the string? (Ib6 8q)u vxye0**xl/bg q5toxhgnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with cqm3- szg4 xg v-pyb4ce9) w2hwy*6fp a force of 100 N in 2 wy4mwsgh6e-pz* gvybxc3cp4- q9f ) 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 onn/hs b z-ow;+h a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. w-z/ sh;ho+ nb 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 supported by two ropes as s-km f/sls0v(shown in Fig. 4-2. What are the tensions ins f-0(kmslsv/ the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the 9fic 36/mt2ggb1 s(wg5hqzvl mass of the traffic light?2(s3 c/z qg 6hwlm1vggbift 95

  Two boxes of masses m and 2m are in contact with each other onzjelm( izx;7kin )v60se w7 4qpv42z c a frictionless surface. cxlze7z;4)0vwk j(2q64mivpzi 7n se(See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on p wq xrl(bg8:j93+ ahha frictionless surface. (See Fig. 4-3.) What is the net force on the mo9ab 8w jqh(3rlhg:xp +re massive box?

  Two boxes of masses m and 2m are connected by a roe t3jikm g5e)2pe. (See Fig. 4-4.) If the forward force on the more massive box 5eei kmj3t g2)is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by :5t,yy-pu7zuwn9 fb q7ydc ;ra rope. (See Fig. 4-4.) If the forward force on the more massi 9 :bd5yruqpwfy z;7uyc,t7n-ve box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. Bm b .qz6-)vj.t8p /m+x ghndopox I txnzhgb+)p/ v -pm6dj. .qom8 of 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 static and kinetic frictionph+n1k *2o:g d+gm:al aj y/ggs between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizo+1kg l *2pmnj aaoy: g+g/:gdhntal force is applied to the box?

  The coefficients of static and kinetic e:w na 2s(d armylb5 pgwn,*c k891.xbfrictions for plastic on wood are 0.50 and 0.4r1d,nmwb 9xwe*n bs2 aglc 8akp 5:(.y0,
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 +1 zoe1yf+ q5hz-avjf (x direction. It slows and comes to a stop with a constant accele +jqhz(o v -1fz1fe5yaration 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 bo-)epfnx 6z8y)x)qupulled by a 5.0-N force. A 3.0-N friction force retards thxxyq)- zpbo )8u )ne6fe motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg (bfw t/udo )f,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 puce/ht d8jay;- abt.q us*jpvzxb8( ;0lk is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient ofpua;ht(zaq0d.j tey bjs8;-b x */vl8 kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid )ik:bagk:5 dtjj6v3 q marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for thv:gqjj6ba k5dt3i ):k e prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fi*oq7q*qmpmky7gf4 n6 v,u ux/g. 4-6.) The surface between the more massive box and the horizontal suy46 vuf g7mqx**uo,pqn/7k qmrface 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 box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The )mo60on 930whhcg( jx 2(pa x2hwujpksurface 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, 93x wpx mj( 6oh pjohha0(n)uc2 02kwgwhat is the coefficient of static friction between the boxes?

  An object is on a frictionldhdi+f n hrkm4, g)91xess inclined plane. The plane is inclined at an angle of ) +m f4,i rhdh1nx9dkg$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an o6 a 6b* 3f.5: vwgzekjoym8a15utvirangle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a 9h0hk z5 (aox- gnqu3m8ukm1p qqh2 :ismooth 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 pllq-cojut0r ns 5k/,mg1 m9x i(ane 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 consta 2yjxu++b va7fnt velocity of 6.vab 2++xu7j yf0 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 rougl rsp0,nt,x )fjsd :/yh $37^{\circ}$ 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 rfgjy 6/cf8hab 2 .b*tmzxi ucc. vx/01ough $37^{\circ}$ 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 att2yb3vhh+m2 :ixtkcg, ached to the log makes an mghx+:, 23thcv 2ki ybangle 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 t (5m5c ueh.vea rough inclined plane tilted at an angle o c5vhe5ue.t(mf $33.5^{\circ}$ 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. The angle of incline is graceqtph 5t:ac sy9s hc:948lw 1dually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static5eh8c sqp9st1 th cl4ac:9:w y friction between the object and the plane?