Which of Newton's laws best explains why motorists sh9 y 0u)dn xxxm2km;lv:ould buckle-up?

  When you sit on a chair, the res)i pnny6c r9nyua8gd6h-g (1h ultant force on you is

  In the absence of an external force, a moving object wd(iayvp4 liu;3 t),3vutkd(yp2 mh-pnb d.d+ ill

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tuotj+wt0t6q0 ty 554a;ak2v md mezj x(rned off, while traveling in emp 2(ok t4ew0a qm d+taxz;0 5vy6mjj5ttty space, the starship will

  A rocket moves through empty space in a straight line with c.de osz s;x5wv - v5yy xv169wkm0b7qoonstant speed. It is far from the gravitational effect of vdxo95v-sxzwv 1k;ms. wy 6qbyo75e 0any star or planet. Under 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, fa7b7pxf f7r8p pcing forward, and you suddenly fall forward. You can i87xp fp rfb77pmply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fallvp2 e :g:gr2tba*6 prp forward as the bus come:pv e62 grg*b:trpap2 s to an immediate stop. What force caused you to fall forward?

  A constant net force acts o, ,+skn vr m;u/fbi0b,sd7eq6mqxtq )n an object. Describe the motion of the object.

  The acceleration of an object is invers:cjhybbz9 t9 69 wvcz*ely proportional to

  A net force F accelerates a mass m with an apcf,d4n9 5 pjuyy5j1hcceleration a. If the same net force h dyu5,59jjf pyp 41cnis applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an a9d gzr*lx* 1 -3qocqwwcceleration a. What acceleration results if a net force 2F ar odwq zg9-3c1 wlq*x*cts on mass 4m?

  If you blow up a balloon, and then rd 9 (xhgh3b0in6-v papz:2di belease it, the balloon will fly away. This is an illustrhbdg20pz(bda39-: nvi6 hx piation of

  Two cars collide head-on. At ev b(yluz fm81ky)j y8*f y0x8ebery moment during the collision, the magnitude of the force the first car exerts on the u01m8yf e*k8y(b8 bfxljzy y )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 which the object exerts on yo xqmnz+iiju/h5e3gy(wn 6vw(- j)hz ;-;t q bmu wil vqby;+zwjm( ujxz -tm5h(qw );3i 6/-nhegi nl

  Action-reaction forcesqszuoajp2y n0rw6. + j+t0uj:

  Action-reaction forcesb;;sineymiz q7 qsw3dy ydf29-.t 5+mf9nl d ) are

  A 20-ton truck collides with ay0-r-k kot8 ox 1500-lb car and causes a lot of damage to the car. Since a lot of-r-tyk8o x 0ko damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object m)f w/(j1.fjaadi2 mewith force mg, which we will call the action force. What is ).1jwmeda ffamj/2( ithe reaction force?

  A child's toy is suspended from the ceiling by:*8 r m4q4xomyr wc6n/. bvmwb means of a string. The Earth pulls downward on the tbmomvbxwy n4q:68 .*mrw4 cr/oy with its weight force 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 instantaneous force.rd4 6n5u p2zz3jqfgu,w-9jre 9w e.ox The ball hits the bat with an instantaneous fo4z5 wjpre9uze23.uo -nwfj6 rg 9 dq,xrce, whose magnitude is

State Newton's three laws.s)bbbp .hsmsuh.2xyl4 a:. 0 j

  Mass and weight

  The acceleration due to gravity is lowp6m*n,dnl- f cer on the Moon than on Earth. Which of the following is l6-c,*mf p nndtrue about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whitsmyi7 sve ht5.1:o z-ch acts at a distance is

  Who has a greater weight to mass ratio, a per3.bpf x 4vck+kd7a5nrson weighing 400 N or a person weighing 600 N?+7k pba5n.c fv4krx d3

  A stone is thrown straight up. At the top of ;nsb0dg pc6*wits path, the net force acting on itc *gspw0bn6;d is

  A 20-N weight and a 5.0-N weight are dropped simultaneously1o a/sfe0y b3(6 5m;cysiwgx b from the same height. Ig;wsbsbcy mx10fei6 ( /gyao 53nore air resistance. Compare their accelerations.

  A brick and a feather fall to the e087p knpl7t6i9ddh l qm) kg2yhbu17earth at their respective terminal velocities. Which object experiid1lk 8q977m)ylu6bd h hng7epk t02p ences the greater force of air friction?

  An object of mass m is hanging by a string 0hz* 0h 99sblp7ez75 o ohjrm c5a;focfrom the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the str0mfsp hh9 ch9jzzb7*75e o a;co ol50ring?

  An object of mass m is hanging by a string from the ceiling of an eyi/,, 4r/:nmk8,y wq0quzul - lji vcslevator. The elevator is moving upward, but slowing down. What is the tension in the s :nquzlc0, ym k/ j/rwv8, 4u-i,yiqlstring?

  The force that keeps you from sliding on an icy sidewhq* ul(v0 j:x+ep2 oaqalk is

  It's more difficult to start moving a heavy carton from rest than it is to keel*-d:m.kgx3 )nj va chp pl.v k:*g na-d3ch)j xmushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horix:( lmwog jo91zontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions rx( owj9o1 :mglemain 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 ram :h:+p5n hno1d klksa7p at constant velocity. Thus we can deduce t 7k:oksnnpa+5ld :hh1 hat

  A block of mass M slides down a frictionless pk6d70)isi n (i*dteyplane inclined at an angle q with the horizontal. The normal reaction force exiie0*yntk di76 )p(sderted by the plane on the block is

  A block of mass M slides down a frictionles pve/i4 9 ; c(d2 tsrtjn v;lv1chub3okjej((1s plane inclined at an angle q with the horizontal. The normal reaction force exoeks4;jit(ed9(3rcb j/ ; huvlnj2 tv p1(1vc erted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q wihp yrfn4a6/i4th the h4 r/hynpfi64aorizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on a du)4v-j mltf+*)x3ak t lny:bn inclined plane that makes an angle of 30e with the horizontal. Make a statement wftylvxb)d+a 3 n-tmk ul4j*) :hich best describes their acceleration after being released.

  An object sits on a frictionless surface. c( vlty/rh3+k A 16-N force is applied to the object, anv+ry3l ( /kthcd it accelerates 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/ 5zcud+ g8ao;as in 7.0 s. What is the average forward force zugo58ca d+;a on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s8nnj :oxw 6 c3j,y6fau in 2.0 s. What is the net force acting onwy:on86fnaj, j 36 ucx the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 mtr+4 ,dh xxvb(t n(3cl/s after travelinb3h t4n +txvd lc,r(x(g
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 from./:qo+eoy hg7 vjbue r) iye+d 1(hqm* rest+ * )dmey.e:1g7 juyh+rhvqioobe(/q,

  What is the mass of a person who weighs 110wo2ck y4r)2t4rx6h s r lb?

  What is the mass of an object that weighs ex-q* hqkj9cr( xi56k 250 N on the surface of the Earth where the acceleration due to gravity i(r9k q5xx*k 6e-ijhc qs $9.80 \; m/s^2$?

  An object has a mass of 60 kg kd2gq3,tu.tw9ty hr ) on the Earth. What is the mass of the object on the rqwhd) ,9ty.g 2t k3utsurface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N oe44docn 4it/:ofm j,j n Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth'cj44/ 4tfo djnmo: i,es. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends ofh kozc433y9re a 5.0-kg rope. Sue pulls with a 15-N force. What is So4r9y3cz h 3keean'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 force F acts on wtc;l pu .(gk6the stack, and it acc6(lpg c;uk .twelerates 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 bpn*p fiwpg,*-mclhkw/e :4- 3 9ngiwstands on a scale in an elevator. What will the scale be readin,i 3*-nl-*i gp 9b:g whpnwmcp/fwk e4g when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass v4gneadhj up x**0oi /84 nzq x1)d*utof the person is 60.0 kg and the ele iax 1q4op)unug*ed* /jxn8tzdh0*4v vator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides g7t0h7 woc rdl:n( y w3twhk/:in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upwa :t7w0l g:/t 3chhronw(kd7 wyrd 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 fo.j7h:dy.i fr6a / eb7b0hhrwbrce has a magnitude of 8.0 N and is directed due norjhwbb6yei0brr 7..7hh:/fa dth. 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 kg rv/l84/ninh kfests 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 stopping distance if the load is not to slide fo niklv/fnh/4 8rward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is80ft m 6uqwk6lm. i mekxz)g;; 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 8tfm;q; kzmx6 0ik )gem.uw6lis the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 197)zi* vn ecpxbyz/u0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of i1 cnp7bzuez/9* )xy vthe pulley.)

  In the Atwood machine shown iyaxp2x4q cm5)n Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fricy aq)5xm2x4pction and the mass of the pulley.)

  A student pulls a box of books on a smooth h*dd80 by. 98us 9jqfllwxk0 khorizontal floor with a force of 100 N in a 9l8q k0hw u x* b8ld9fd.yjks0direction 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 horizontal floor with a foyfsx9s2pn ) clse07u+2ui( h drce of 100 N 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 oi 02u 2n7px)( ssu+fcy9leshdn the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. ti .iee;eodix j 7 tl-6af.19lcio7m 74-2. What are the tensions in the ropescl;l7eatm-oi6 e 9t e.7di 1.7xj iifo?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is thhfs 7p/hts-d1b(v h;nhrs8nz pz; 7d /e mass of the traffisp; dzhz hpr;dv/1-hsnh t/7n8(f7 bsc light?

  Two boxes of masses m and 2m a/ 1tpvg*c g2eire in contact with each other on a frictionless surface. (See Fig. 4-3.) Wg*2ge/c1ipvt hat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in))unf t1/ f7dtci6x//w av rlj contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net forcc)ulxvjr /f/d1t) /7 iwntaf6 e on the more massive box?

  Two boxes of masses m and 2m are connected byfiv 63 qt.pm nw0mpvcc2a070o a rope. (See Fig. 4-4.) If the forward force on the more massive box is 0a.wm6 ft3pv0c7 mvopiqn 20cF, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are nwq )- c83mhuuconnected by a rope. (See Fig. 4-4.) If the forwar8n u)muw-c q3hd 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 pulley3dhx;2:up 7lj y1 lmqm2 tfqx mx)4daw.p/2wy as shown in Fig. 4-5. Box I of masmw2fl/yj 1.dt 2x;)wa2yquxqlm4dpx :p mh 73 s
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 f3u nj)2* gkqharictions 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 horizonn23ka*)ghqju tal force is applied to the box?

  The coefficients of static and kinetic frictions for plastvask ci5z7bamw f/24 ;ic on wood are 0.50 and 0.40i b kv/;s27wfacam4z 5,
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 levej7(iwze , ,/lk a/kyzul surface in the +x direction. It slows and comes to a stop with a constaki aw,/(e yu/,lz zk7jnt 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 by a 5.0-N force. A 3.0-.t a, s-ga .h-;d)k*qmdam(vo,tidxoN friction force retards the motion. What is the acceleraad-mxv aq) ati,.g, *t.o( ko;-hmdsd tion of the object?

  A horizontal force of 5.l. *lmd/ b(hgh0 N accelerates 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 puck is given an initial speed of 10 v2ay;m,9av6fjh*v y pm/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between thejyy;v 9fmv2 ha,v* ap6 puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 0zg mn qth+vkr-0y ,)nm long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 )kgn, rvq+0 -ytzmn 0hfor the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are sow.v62p2lbhom gc) 5;o (aquotacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more mao .co laq pv(u)o26m2bg woh;5ssive 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 sum t2jei5fo jwq;ip7056+ivwp lgx( y3rface between the more massive box and the horizontal surwpigji0 6e+j 5 vlof7i3(tm y;wqx52 pface 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 plane is inclined at an anb8f2 nd0ej i6h ,qzg(lgli0 n8d6eglfb (hz,2jqe of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dow175axyabl u5wp jcyz2;bd(k5n a flat hill 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 plane with an angle ofwzorzy034d:nvm5,x fn 7tu hhat2;5n $37^{\circ}$ 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 anglj s5k)q8n-zrh/z (01 oop khuve 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 downvse9*1.f4bpalxvqm;,4 x jsa an inclined plane, at a constant velocity of 6.0 m jm*espvqs 4xa,x19 lf4.v ;ab/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 slia *3iet1ssdn +des 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 /qgy5kedxg7p-p)e+y 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 5 35awt-*q e/vj/zezdx00 N along a rough surface. The cable attached to th zz3-atxj /5dqw* ee/ve 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 frordxr 6f; 6.bo6:6c.cq:qcn cmfyr7r z tx s*s7m rest on a rough inclined plane tilted at an angle oc*f;mcx6srz7 oq67rbc q6c:fr.ry.6s:d tnxf $33.5^{\circ}$ 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 f- ; d/mu0t bgnd+gkflepj-64. 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 obje-p k+g4 ndu- tj0d;ffg6/mebl ct and the plane?