Which of Newton's laws best explains why motorists should b 3og0bk6d7 diduckle-up?

  When you sit on a chair, the resultant force 4 zv fd4mbeeljns-q,9; .dl 5don you is

  In the absence of an external forh0ca, wldh9g3ce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are syt91jk f-5cdeuhh 6 ,guddenly turned off, while traveling in empty space, the starshc g hdjf1ky95,h6tue- ip will

  A rocket moves through empty space in a straight line with constant spram(3y0/. hcs pnm bp(eed. 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 its motion i narmpsyp3(/hc 0m b.(s

  You are standing in a movingy/(xceti wc 2/ bus, facing forward, and you suddenly fall forward. You can imply from thistycx/( /2eciw that the bus's

  You are standing in a moving bus, facing forward, and you suddenlykgj(2y(. h1dfoq yoy ( fall forward as the bus com hqyf ((od.(j1yygk2oes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on abp2 d5vivb1s9 n object. Describe the motion of the object.

  The acceleration of an objet-xbv(irbhn 3:vw1i : jog,5sct is inversely proportional to

  A net force F accelerates a mass m wit y5 ,v:rxq,nqeh an acceleration a. If the same net force is applied to mass 2m, then the accerq,q x5ye:n,vleration will be

  A net force F acts on a mass m and produces an acn/2s xj sd,+uhceleration a. What acceleration results if a net force 2F acts on m/nd,us2 jx+ hsass 4m?

  If you blow up a balloonwv u9:d1( ef ges+m26f)y srsv, and then release it, the balloon will fly away. This is an illus v :fgfe s1rdsewm2y +(9s6v)utration of

  Two cars collide head-on. At every mom)(g5ej gt v6fient during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitv(ifg5et6 )gj ude 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 l8sxcjbgw nz47w9 yly7 p6r3+on you wil67 y+4l8nbr wlg7 9yjc szpx3wl

  Action-reaction forcesr -wo .fz;d6 )q;zrm3iyo5sfi, nc d.r

  Action-reaction forcespov.tnv/;y-2c lj* pa are

  A 20-ton truck collides with a 1500-lb car and causes a uai4j;gia)jn /m k(h4lot of damage to the car. Since a lot of damage is done on the a)kj/4mj4u i;a g(ihn car

  An object of mass m sits on a flat table. The Earth pulls on todp.0rhx+6d e his object with force mg, which we will call the action force. What is the 0 6oprdex +h.dreaction force?

  A child's toy is suspendedmi pp5wao ./m, from the ceiling by means of a string. The Earth pulls downward on the toy with its weight forcm5/o,ip pm.awe of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantanenqm5rje/ w5 hwz-1v ;mous force. The ball hits njme-;w wrm z/hv5q15the bat with an instantaneous force, whose magnitude is

State Newton's three laws.) ud( xwgl bk v lsoqdah8x 3d3yv:f57a02..ng

  Mass and weight

  The acceleration due to gravity isz edl9q5wqp 8( lower on the Moon than on Earth. Which of the folloqp(q9 l8wz5de wing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which us)pui5c0vt 859 cnhracts at a distance is

  Who has a greater weight to mass ratio, a pzgx3kno* -)aherson weighing 400 N or a person weighing 60x)3kgn- ohza*0 N?

  A stone is thrown straight up. At the top of its p *nwsut6 l)la)ath, the net force acting on it istaswl)6 *lu )n

  A 20-N weight and a 5.0-N weight are dropped s4oxo/rk4h1p d imultaneously from the same height. Ignore air resistance. Compare thx /p ro44dkho1eir accelerations.

  A brick and a feather fall to the earth at their respective terminal velocio2k/q9csly, j l/ k05drk29ainl heg*ties. Which obgkar/dln9ey92 l ki2/kq, 5lc h so0j*ject experiences the greater force of air friction?

  An object of mass m is hanging bymy7mdpu 2gbi *uk9o pwx8,z0- a string from the ceiling of an elevator. The elevatorup7m,z0 o bw9mkxiugyd p2* 8- is 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. +z*ju7l0 - higj rx;oi The elevator is movilxih;oziru7 j -+*0 gjng upward, but slowing down. What is the tension in the string?

  The force that keeps your* 9c*jei-r;nx 3 tdp(hvxp)i from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy cafcq+ 2l:lp4 knrton from rest than it is to keep pushing it wik: pnq l2fc+l4th constant velocity, because

  A horizontal force accelerates a box from rest /g wd*m4reaby54v4 fj05 cr aqacross 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 dou0* ye4qv4f5rjg5/cdwba4 rambled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thd*bu xr/ s 9zikx)pd(0us we can deduce th*z0 idbdx9(/)rsk x puat

  A block of mass M slides down a frictionless plane inclined at an a+43v si/o cv4m+fyoxangle q with the horizontal. The normal r4vf/co+ m4+s xioay 3veaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with, b ,uhh0jz-ggja l+a: the horizontal. The normal reactgahzj0: u,b ,+-ahl gjion force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an v,;c h((pl sb)3nsj(i; xzlf qangle q with the horizontal. The gravitational for(xf l;l(s( csqbv;i3 ph,)jz nce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on a/yry cj.: oie+1ezm9/*q nnvn-, hadmn inclined plane that makes an angle of 30e with the horizontal. M 9n -nqj.vmhyed or*,1zmy/n+ci:a /e ake a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the( oaf- p5bpdl9 object, and it accelera( 95ppf oab-ldtes 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. Wh+e;lcihvo ly(wx dsi0.2 (fg 8at is the average forward forfvih c(i2wg o (llyds80x+e;.ce on the car?

  Starting from rest, a 4.0-kg body 7xc,fgxe 34ic 3 (ujqyz(9dbfreaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the bobixdzc4cjxu3 f7 ,(fqe9y3 (gdy?

  An antitank weapon firee7:rpg 0gu.* yvwy5 pvs a 3.00-kg rocket which acquires a speed of 50.0 m/s after trayg.wup vye g 5:p0vr*7veling
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 (-yegk9 xrdpf5 s ea9p m586zzforce that you push a 10-kg mass from rest5ys 6g zz98mdpkfper(5axe9 - ,

  What is the mass of a3). sjo*tiv/qso c +ke person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wh uo.sf djd8b8b,v. wr(ere the acceleration due to gravit(.8drdwbof j, bu.v s8y is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What ispmeer:- ; lva .qx4y(e the mass of the object on the surface of th:ee-q r (epa;y v4mxl.e Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and obn70n q a)*yh fim9uc3e +qy0tsject B weighs 40 N on the Moon. The Moon's gravity is one 3a0c qyn)uyfh9qm7 *s t0e+insixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on u;5j fmk.xm+ fxiu/;i opposite ends of a 5.0-kg rope. Sue pulls wif .5;ximi/ mjuk +uf;xth a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A *sfch:::yl8 e2 wdspwforce F acts on the stack, and itdp hw:2s*e flw:ys8:c 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 scale-0f-+qh 9a. 7selurn kr4ree 5 hrs9tp be reading when the elevfqs-7 e trrs4e.kh5p ueah9l90-r+nr ator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kg/qlgb8)d;cej2c c m8+ yy fkzsu;/ph - and the elevator accelerates down zfup;/my cbsygc8hqd+k)2-l/ 8ej c ;ward 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 the mass of the person is 60:i9pk+rm;:e rsp 9 yhz.0 kg and themr:;re+ y:pp z9ihk9s elevator 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 hae :x8 lhk3,zurfq41hos a magnitude of 8.0 N and is directed due north. The second force toward the east h8f3qoexh1 rh:zlu,4 kas a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbe8ri2w be(9atjbqc7 i) sn: 9tud 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 s:tei7n i)r9t8b 9aw2j bqu(cslide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of *o1t gjc i;f hc*g9runqba7-;a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is travelin o i1fr;- qhgjca;*7g*tb9cun g 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine sho7t(rbon err/99eec4u wn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore f/9eercur9t(4 rb7 eno riction and the mass of the pulley.)

  In the Atwood machine shown in Fig1etj*1p c perm3 3so*l. 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 pu pestjo 3*r em1*cl13plley.)

  A student pulls a box of boz9 8vkakxdx . 1 hwehw+35cuu6oks on a smooth horizontal floor with a force of 100 N in a direction 6hw hu vw3a 9c58zkdu1.kxxe+ 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 horizogc .a*/hso0 znntal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of tho* sn cz.gh0/ae 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 shown i;y-b0 gica:qd6 -jy00ms1 yrli6bqmmx: lk:xn Fig. 4-2. What are the tensionabs-m imx1c:xlbg yyq:dq-y0l:606i ; j kr0ms in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massmt 9ma4lx/9 rdgan- q4 of the traffic light 9 lqmxatn-d449gr m/a?

  Two boxes of masses m and 2m are in contact with each other on a fri/ bbatxi5*k td2 m1;coctionless surface. (See Fig. 4-3.) What is the acceleration b ;x12a kdo/ bt*5timcof the more massive box?

  Two boxes of masses m and 2m g2s8mknn58otj u,l+dob am 87are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net forsnd8u2o+j l tm8g5,7b8 nkaomce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See F y*1:u9avhk/ tq;c0 w(anj rcgig. 4-4.) If the for1(h0/vw tqk g rn; 9acyc*auj:ward force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses v qbp :4odbcs:822fy wm and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the p:w2cq 8d 4v b2:fybsomore massive box is F, what is the acceleration of the less massive box?

Two boxes are connecjxeqc:u j 3dn4ix(+:q ted by a cord running over a pulley as shown in Fig. 4-5. Bo ij3xxcqju:+dn :e4q( x I 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 stak1+h0x*l1mm67fvd / j umptdkhj )r+atic and kinetic frictions 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 horizontal force i+fu*)k/rkj1j 61hmda 7mtl+0vhmpxds applied to the box?

  The coefficients of static and kinetic frictions for plastic pmubdd;,0fb 5k15 vsoa8s x i4+;yox ion wood are 0.50 and 0.40,d 8p0sv51 ,5i xf;;obb xuy a+dsk4mio
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 y;up6vvcum ;8 +x direction. It slows and comes to a stmv8v ;ycu;pu6op 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 sur e4ypo7uz dfsyf;phw78 )p2q-face is pulled by a 5.0-N force. A 3.0-N frictionqu4o)z e ; hyd78fpw-sy 7pp2f force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accele1aod7 -x sdr)yrates a 4.0-kg 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 pucoh*h a)w (ag9z6gwz5 fk is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kineti*ow(zg )fg h569zahwac friction between the puck and the ice?

  During the investigation of a traffic accident a 6kt5. 0b oa+-tvkd9vnpx-u6gwulx/ mbz,m:, 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 for the prevailing conditions. Estimate the speed of the car when 6z 9-vx:6mtm+/k u5 .kdtv 0 gpabauol,-wnbx the brakes were applied.

  Two boxes of masses m and 3m are staa/,ssh*c ( ctacked. (See Fig. 4-6.) The surface between ts,csta* h ac(/he 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 box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6 9trolgxxqxhs3/. gt.n-6o6n .) 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 coefficient -nt s6tgh n 3l/9ro6q.xxg.x oof static friction between the boxes?

  An object is on a frictionless inclk1f+in ws7 y0zp0q0rpined plane. The plane is inclined at an angle ofqk0sp0nz iw0 fry 1p+7 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes n a.b4gh3sjbpvlu 1cs3/q led 8+:mc0an 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 plane wiss-fwq9 sq +.ydx /;fyth 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 plane tilted at an anglez z)w)w k d92du/1aatq 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 incline)m*vbvl zr2vk ym +n01d plane, at a constant velocity of 6.lv mk0zv*bv +y2rn1m) 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 mass3 r zo+hkj u;il bd1sv.d.zq,iqk (d): m slides 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 a rougha.pqxl i 5*ay8 $37^{\circ}$ 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 2 wmmhihn/+e ugl9; r6log weighing 500 N along a rough surface. The cable attached to9/n2+rw6eu;mm lhihg 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 releaser4fru:e: (ohyd from rest on a rough inclined plane tilted at an anglee: u(fyrho :r4 of $33.5^{\circ}$ 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 knh5*q4pd td9incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of stp5d4*th9nkd q atic friction between the object and the plane?