Which of Newton's laws best explains why motorists should 7 nfuc,zf- i:obuckle-up?

  When you sit on a chair, the resultant force xbipj)3/wwmk/h .;j;qeah 4pon you is

  In the absence of an external force, a movingculs8/ucfr m 3lxl(4 ; object will

  When the rocket engines on the s8f/junv u 1h)jtarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starshinvu8j)juh 1f /p will

  A rocket moves through empty space in a straight line with constant speed. It , 3(ywhaz2z xpis far from the gravitational effect of any star or planet. Under these conditions, the forcep azhz 3(y2w,x that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, anb57 u ((n7mw.q*vg..ifri(bhuru sou d you suddenly fall forward. You . *bufuuhw. i(q5ug.vi7mn(bo rsr7(can imply from this that the bus's

  You are standing in a moving bus, facing z,p7-gh6nl hh 69ywnd b(.nxmforward, and you suddenly fall forward as the bus comes to an immediate stop.pd-n6z w 9h,lnghx 6n7b(.myh What force caused you to fall forward?

  A constant net force acts on an object. Describe the mons. cm141 skuution of the object.

  The acceleration of an / 0v 3li8piyepobject is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If theij 5v ;lw6qvec ebv jp q3la//*ny*g.1 same net force is applied to mass 2m,* nvw.jqv*5ej /cgav beyll6 q/1pi3; then the acceleration will be

  A net force F acts on a mass m and produces an accj( 8ifams ph1-.)7tb xsjhx+neleration a. What acceleration results if a net force 2F acts ontxs-h+7. xn ai (pmfb8j)hs1j mass 4m?

  If you blow up a balloon, and then release it, the balloon will a zqe30;/aj5u z)ke opfly away. This is an o u)e0;5j qkp3aze/z aillustration of

  Two cars collide head-on. At every moment duri k)3k,lt3;w r fwrj6kdng 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 first. This is an example oft)k;k j3kr wr36f,dwl

  If you exert a force F on an object, the force which the object exerts o21rxdk x+5ct 9o5egxf n you wilxcorxx52g 9+5 1 ftdkel

  Action-reaction forcb i6+smf.d*ytes

  Action-reaction forces arel7),8 wif fknm jw;ry.

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the cda 6)d jv,s4dtar. Since a lodd t,a 46jsd)vt of damage is done on the car

  An object of mass m sits on a flat table. The Earth pull3 5*g ge)gon. qwvpxn,s on this object with force mg, which we will call the action forcqwv5.g )no gn pe*gx,3e. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth pu65nd,ythyb d 3lls downward on the toy with its weight force of 8.0 N. If this is the "action force," wy d,ydbt 653hnhat is the "reaction force"?

  Your bat hits the ball pitched to you with a 15l 2n3laksp- abi y14,d00-N instantaneous force. The ball hits the bat with an instantaneous forc b,kylsn d234i -aalp1e, whose magnitude is

State Newton's three la0zq s8 7u1riq 5c4kvdv -qxec1w+py3aws.

  Mass and weight

  The acceleration due to gravity is z 7 -22 eqws,hgp3gqdnlower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfaced -qgn,23g 2wpszh7 qe, compared to Earth?

  An example of a force which acts at a distan/ak oj;b.z, hrce is

  Who has a greater weight to mass ratio, a persocp*o:n(b9 nxpn weighing 400 N or a person weighing 6b *ox(n: ppc9n00 N?

  A stone is thrown straight tbwqntgs3:b : .xp 9hk /d9pn0up. At the top of its path, the net force acting on it i knpq 0b: 9pt:3nxs/9gh wb.tds

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the s76az(zc4kxtoi7ij tp z)wfi3 d/9w+ game height. Ignore air resistance. Compare their acceleraa43izip7)k idgzjc z(/ t+tx7w9owf 6tions.

  A brick and a feather fall to the earth at thyw)0 sy9o wyina* p9* )zezq2peir respective terminal velocities. Which oyz o z* 0qwyw *)2py9a9spnie)bject experiences the greater force of air friction?

  An object of mass m is hanging by a strir dx96jqx-z khwg,/ g+dhu69 hng from the ceiling of an elevator. The elevator ighz+khgdq 6u h6x,9jw9d/ x -rs moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. w cepd6l9k6f-The elevator is moving upward, but slowing d lpf96-e 6dkcwown. What is the tension in the string?

  The force that keeps you from sliding on an .)wb5b+. khe)esiwssdj(r4 e icy sidewalk is

  It's more difficult to staklfc .pgrq 3 .7.3/ fm3vgh*wppmrll4rt moving a heavy carton from rest than it is to keep pushing it with constant velqgc.h.rpl/m wf4p 3g l.p 37m3 lrvf*kocity, because

  A horizontal force accelerates a box from rest across aqatpslg00wk 7k0m;4 f8k2k id horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontalkk4 akgti20 w;70sd 8fqk pm0l force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thprpx ( l8d6wo1us we can deducwp(18 dl pxr6oe that

  A block of mass M slides down a frictionless pll8s(4 .ja4yums,*r1 atcd, ativu7sk ane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the rttav,48uik4sascay 1* ,l.sju 7( dm block is

  A block of mass M slides down a96qevffg 9xs fc2g)p; frictionless plane inclined at an angle q with the horizontal. The normal reaction force execgfsq vfgp;f69)9ex 2rted by the plane on the block is directed

  A block of mass M slides down a fric wsek/lyu 943k2eid :ftionless plane inclined at an angle q with the horizontal. Thei/ 2lw9e3fe: duy4kks gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultan(fplka;dqn03;jmw6 z*blt 5u eously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes theirpa;*03nz5t(jq lm; ud fw 6klb acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied tu+h,i nc 5o+pao the object, and it accuh, +pnco 5ia+elerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acce2 g+amkrd o)0wlerate from rest to 27 m/s in 7.0 s. What is the average forward force on thgow2a+drk0)m e car?

  Starting from rest, a 4.0-kg body reacheseg24*av bbigtc )k -0j a speed of 8.0 m/s in 2.0 s. What is the net force acting on the*g4)v ie0a k -c2tbgjb body?

  An antitank weapon fires a 3.00-7o,xs cuen 1(c(m ji2zkg rocket which acquires a speed of 50.0 m/s after travelingzj1 o c(x7, uecm(n2si
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 3hn9l7pi 8kaqs8 tc2xpush a 10-kg mass from rest9phi8a2sq7n8 3xt cl k,

  What is the mass of a *tx )3bsa hf,7 u64 orypya(qsperson who weighs 110 lb?

  What is the mass of an object that weighs 250 N on awr exv0yq;xz5 *2ms fbj);e(the surface of the Earth where the acceleration e 5*(vjry2a )bzqs ;0wefxx;m due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 6y. i8l9hae)3 rje1tim0 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the mj.ha19lre3 i8yei ) tEarth?

  Object A weighs 40 N on Earth, and object B weighs 4+0e hb-(ka3 rszmio/d0 N on the Moon. The Moon's gravity is one sixie+ r0zh-b(kd/ ao 3msth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite e:ib wz-xtximr( :t,v2o -hw ;8jp3t hcnds of a 5.0-kg rope. Sue pulls with a 15-N forcehh wm 2;t,pi-3 oicjtwr vbxzx8t(-: :. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests onq5 g-bo5h1gjf .9 zq6/hafir i a level frictionless surface. A force F acts on the stack, a5fo 5iiqghagb hj-6 1/.r9z qfnd 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)vs09f* h5)bqa:czw(ky irzl. What will the scale be reading when the elevator is fzc5*kb 9( azh)si): vwqr0ylaccelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevatdc,hoo8y ai rb:+di osh(c).w*pm 5n* or. If the mass of the person is 60.0 kg and the elevator a**.icwmi5(nh+yorhs)cbo,: p8 od adccelerates 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 elevato(sr l: o5(wuz,p)jx gzr. If the mass of the person is 60.0 kg and the elevator accelerates upww((,lp g) r5zu oj:xszard with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act 5*; kb :xg-w99 :bnwrxxkkkk don 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 of 6.w ;nd-kkb*5gwx:xx k 9krk:9b0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbelwb/3d5zwe+xm*g ;b5p akn d 0y+p m7md 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 xb5mw+0z35m 7/mpe;y d+l anbpk d*gw 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 on the flatbed of a truck. z oga w 5i3dn)an5:d2j 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 time if the load is not to sli3n25wn jd o)aazi:g5d de forward into the cab?

  In the Atwood machine shown in Fig. 4 jik(njbb2b-,nvk*c t)zxw 7 9-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration2kj9ikbn7btzcx *(v n,-jw )b of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-:x93npwg3s1u4fvfga e bh) +r1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley.)g p3sxr4h)+vu1f e:gwa n 9bf3

  A student pulls a box of books on a smooth horizontal floor with a forcexh:+r qmwutac;(s/ p 5+b i7mx of 100 N in a x7m+p+;bq :c r a(ti hwx/smu5direction 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 horizontq9** ,cvyxxx5s 8m annal floor with a force of 100 N in a direction of 37.0e above the horizoy *5a c,sx*9mnvxq8xnntal. 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 :rlv tbmn(jn4c , 28edN is supported by two ropes as shown in Fig. 4-2. Whatj(v8tcb ren:nd l2 4m, are the tensions in the ropes?

  In Fig. 4-2, if the tensions i.q j tuu:-lev )glg9y,.ejy5 in the ropes are 50 N, what is the mass of the traffic l.e5-jyt ,lgylq:egj v iuu.9) ight?

  Two boxes of masses m and 2m are in contact with each other on a frictikt+o - hus7bh(hjyi u7(fbp;)onless surfa ( oth+y( hk- ;)7iuuhbpb7sfjce. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eksvs yzro ea /v.)a*07ach other on a frictionless surface. (See Fig. 4-3.) What is the net force on theo/*z v)7.akey0s ras v more massive box?

  Two boxes of masses m a wyr3 oxw* c2y l,mtukinf05+:lu8o6wnd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the tk 5yin :2fl0 ,6y ruc8+wx o*lww3oumconnecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-uf iuer.(us: g;0d .be4.) If the for: 0.;e(buruudies .gf ward force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as showw 3nl98cfm z 5+k-l m(y.nhllwn in Fig. 4-5. Box I ofnl(+ mz.l klc8fw ml39y-5n hw 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 frictions between a 3.0-kg box and -c; nslee3b st 7)e3rx4xqp.+wzx:ona desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N hor-ls3 zwx7bp+e.4o x: 3c;e)sen qntxrizontal force is applied to the box?

  The coefficients of static and kinetics kq;+h: sy v v4b+anlog-01gn frictions for plastic on wood are 0.50 and 0.4h; +gsn4q ny+g bov0sk1-va:l0,
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 surfactk + ns;gg *1g7prv:/h jwxcy.e in the +x direction. It slows and comes to a s7k rsjn+wxg tp :gh /y*vc1.g;top with 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 on a horizontal surface is pulled byxe;7htup r1* 5kea.:j)grx+*bgal xa a 5.0-N force. A 3.0-N frictbgt.kxhe axae arl+;u5 *r x)jp*17g :ion force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, ao+b eg:3e,9 scfth*g tt 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 sxr y02g3dqme2ugr/ b2peed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and tye gu/m23x0 2rdrb2gqhe ice?

  During the investigation of a traffic accidfaay8ps+ 6q /7fy0tz3 ,izmedhx f 1x-ent, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 fx epza1+z /is7-fydfyt xa,60fh8 mq3or 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. z mvswb5ue1;x:cf ycv m2h+5 84-6.) The surface between the more massive box and the horizontax55sz;v1:femw vcu8c by +2mhl 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 box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-jvro/hok25mcq5lf 4c 0 :oz.22/u wkfuqmxp-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 massiv2pr5mm 4l0k x.5foco22hvqj/-f q zk cuw:/uoe 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 inaoc z3v6d/b3d clined plane. The plane is inclined at an angle cd6avbod3/ 3z of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anglileh so9+-tl/nz8 m2ax l9r h4e 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 plane with an e.- jsawg,qo30v2atudln77 te * k4asangle 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 an angle v( wbq3 zv92xcbd);nrd(to *u 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 dir 0te.j;uym o1)jwi5inyu/j i0ectly down an inclined plane, at a constant velocity of 6.0 m/0 0;y1m./n jii5j wto)yujuies.
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 rough qk8b3 rrn+)l1e /epxu eg( hw4$37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass7snyof t; sls3: nu8w: m slides 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 acy01vwvlj4u3/w3e dc long a rough surface. The cable attached t /0vcv 3w 43uyecw1ljdo the log makes 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 a rough inclined plane tilted a :3dl/.uz(c e dr5 r2hy7bdofd/vv e/ut an angle o(rdh3co vzedl u/d.5bv:yf d 7ru2e//f $33.5^{\circ}$ 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 inc6 :b nf*(k5 zmmm;6cqh*iyj moline is gradually increased until the objec*m6:fbh qmi zjy65mno(*mc;k t begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?