Which of Newton's laws best explains w ollm*jrw49*wg7ugz 7vht g83hy motorists should buckle-up?

  When you sit on a chair, the resultant force on you isnkpa .z82hb d(

  In the absence of an external force, a moving objecz* wc026pp,5jre*e4 tfvatzj t will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddeosy,e68xvh9g :wkhw9yt /a/bioc+ x-,qua(p nly turned off, while traveling in empty space, the starship will b v9eo,,wuoq kychs8 /pag 6xt y+wi/xa:h(9-

  A rocket moves through empty space in a straight line wik8k5 7lnbe9dwxf) 0 w2domw f6th 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 rolo)7f690 f 8wxmk2wwdendk5b cket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fal::s iy tcwz vcv;k5)o3l forward. You can imply from tos:w z; k:vc53 ycitv)his that the bus's

  You are standing in a moving bus, fac -b4q nmm/nt srhffu9r a2/(4ging forward, and you suddenly fall forward as the bu - nnfg q4sut4/m2fhm/br 9ar(s comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the0 6pbmo6ls r4x*y6ea m object.

  The acceleration of an object is inversely pro) bu/hdlpjn 2cf fi-43portional to

  A net force F accelerates a mass m with an acceleration a.gc:ue0 (,ea si If the same net force is applied to mass 2m, then the acceleration wsaei0 :, geu(cill be

  A net force F acts on a mass m and produces an accelerati((yw* d7j3cuj.q nmb5-w-cj ow4m r rbon a. What acceleration results if a wc( 3j(bjm m *7qwj4ncrb oy .u-d5-wrnet force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the bknm: tvvz u:-)alloon will fly away. This is an illustratio:-kvmz)ntv u :n of

  Two cars collide head-on. At every moment during the :cczvf0 -:cq *,fxyeell(-qp collision, the magnitude of the force the first car exerts on the second is exactly eq fqv c-e(e x:q ,c-flypl0c:*zual 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 you5g ;dp,zf:i cy wi5 gpi;fz,:d ycll

  Action-reaction forcrnm2 yb;mt -2y8t ql1rql0hy7es

  Action-reaction forc1(aa 1ppvh2 mxes are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damngr4n f9tv3fn) ppr*c- x)66kmbtlg:age to the car. Since a lot of damage6m p-pfvf4)3nc*tr9 x)n:gl krb6gn t is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objeoc(o 83t 0:pf0hmjocsct with force mg, which we will call0otm 0(c3 j8 :pohcsof the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Thef*bkn;dl 9y1oli s a;gd)d3:z Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "acydl;bl)z:9*fnsgid a o3;k d1 tion force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. y+ tue: 2jrf0s The ball hits the bat with an instan rus:0+2f eytjtaneous force, whose magnitude is

State Newton's three law e:kl 1 xxrbu,fgo(-h,s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which n2mnc:q l7p4uof the following is true about the mass and weight of an astronaut on the Moon42:7qpn mu nlc's surface, compared to Earth?

  An example of a force u,6173bn9 iwvgt xtn o9/b jhywhich acts at a distance is

  Who has a greater weigg7z6 fa3wq6v0d*e vwditt(s/ g z)sx2h/ kmw:ht to mass ratio, a person weighing 400 N or a person weighing 600 N?v/z sg:670tdw( 6zghx/w3v*fmdka e 2 wqits)

  A stone is thrown straight up. At the top of i +ve7h6f xj8iwts path, the net force acting on it768 vwx+ jfhei is

  A 20-N weight and a 5.0-N weight arei;98rr b df* k2emmdg0 dropped simultaneously from the same height. Ignore air resistance. Compare their acc rrdm dmkg089 ;e*bfi2elerations.

  A brick and a feather fall to the earth at their respec8s7n)mb p/l jt(vt il3tive terminal velocities. Whic)npi3b7svt8(tjll / mh object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceili cb w4yed8/7e9a+.q+ay fompgng of an elevator. The elevator is moving up at constant speed. What is the tension in the string? y/ 4g.cebp++aqw9 ymea7 fdo8

  An object of mass m is hanging i5od)f a:ul*7s+ mzsdby a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string dd*o5f)7luaim: z+ss?

  The force that keeps you fr;,jv b5hxnzpd+o,t9k :o rc+awa +fq6/h1i biom sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is t tt87cdk4(mb xo keep pt7dxmtk84 bc (ushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface ud1k59e4g e05ym 0jp*za hybc(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 happens to the box's accelerationkh4em5jy pb uc1 0 ze9g*0ady5?

  A packing crate slides down an inclined ramp at constant velocity. Thus ,( nf .28lrkkhhor5 (g:d hwanwe can dng2 ,roahr : (wk(fkldhn58h .educe that

  A block of mass M slides down a frictio om3dqc1trpp8 gjly ru*z+,3 2nless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the zg8tl3dp,rmqo+ p c*ur 2y3j 1block is

  A block of mass M slides down a frictionless yxn1zb0fe 7i3 ;wc8ptcrdb8s 41 8 euyplane inclined at an angle q with the horizontal. The normal reaction d uwzbti10r718 ens c3yypf8x48bc;e force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined l)lx0y/p g8xakfz7j9 at an angle q with the horizontal. Th pal9fkxl 0j78/yzx)ge gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneous7iyk,fa* (qu mly on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describe(f 7q k,auyi*ms their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is af lrj3 u,s38gapplied to the object, and its83a,r 3jgflu 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/s in 7.0 s. Whd*w5.ns us d7cam.a. wat is the average forwasu*..a dwsna .wdm5c 7rd force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s i2wly k12s r/cqn 2.0 s. What is the net force acting on the ylsk1 2rwcq/2body?

  An antitank weapon fires a 3.00-k 27numod,vxe;g rocket which acquires a speed of 50.0 m/s afterx m;nuo2 ,vde7 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 the same force that you push a 10-kg mass from reu;9i,h0l: bup zr nil4spun 0l:ilrh9z;u4i,b t,

  What is the mass of a person who weigh7//o lf( 5,xdhkoacf js 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wh:,r;xb.,j3v crjz rnkv 89xbwerez9,jrn:,rw8vk ;xj. x 3 rvbcb the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of *fe .5c9bxrqy bue+yvh e1ix 38m+;xa60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to grav m1 uyexeha ;bxr c.e*+f3i+589xq bvyity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B w 0xaqtcu/ 9ru2q9l3egeighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the au2gxctqe3 /09uqlr9masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0t(.ryj: azz6t ps6/f,yists5b 2ss /0p/vi dd -kg rope. Sue pulls6 s/vjsty p(5f:ir t 2z.,t0as//dpsy siz6db with 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 leo1y; d:7bswqbvel frictionless surface. A force F acts on the stack, andybwq:1 ;7dobs 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 standg9tc8 rocodm ;)+gcw 2s on a scale in an elevator. What will the scale be reading when the elevator is acceleratingw;ogdr cc+o)m 9t 2g8c downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the map2 zqwluvuj, x3a48g- 8(bqh sss of the person is 60.0 kg and the elevatozb s3alqu-v, qgh8 u8jp2w( 4xr 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 the mass of the person mi8t0/h(ifr ho 6t q rtkud59d4l 4kx*is 60.0 kg and the elevator accelerates upward with an d0xu5dr4 *h/mh4tkolf r(9kti i68qtacceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One w; 1 (q.unx;ebeb. pvgoewi9/force has a magnitude of 8.0 N and is directed due north. The second force toward the easni1b wuex;oe/pe ( 9b;.g.qw vt has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a trun6g:q:gie4 xc ck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truckcx::iq6 gneg4 is traveling 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 oztxj f;i9bgs3 y4 5t/on the flatbed of a truck. It is held in place by metal brackets thjt/z;gf y4oib5 93 sxtat 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 slide forward into the cab?

  In the Atwood machine shown in Fig. 4-17 vnj.o +5lfb8ip4nz m, if M = 0.60 kg and m = 0.40 kg, what is .7v jm8nnib+o54 pz lfthe magnitude of the 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 and m = 0.40 kg, what isy;(os 2h )difl +4n ub/sd 8))aiqsoso the tesi48ofo iq;) ndhb ys( ldsau2s/)o+)nsion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth hccvj6 c66 ltp6+n o/mksjoz --xc x)u:orizontal floor with a force of 100 N in +c ctm6o6x)jv s/6: lk ojc zun-6c-xpa 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 smooth av( uhq9bh i6.ts*5k fh2odz, horizontal floor with a force of 100 N in a direction of 37.0e aboit* k 5(.9sh uvhaz6b,fhdq2ove 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 w)4nx-qnzw:y3b 1c aduocyc 37 eight 100 N is supported by two ropes as shown in Fig. 4-2. What are the texc73n-cy3z nqdbw: 41aoc uy)nsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50y+23i y y2kh d :a(awbjf2icl, N, what is the mass of the traffic lightk lcyi2:wj+hy(2aayb,idf 32 ?

  Two boxes of masses m m0m5cl gtsa*3y oz*fds6f:lc o..4 us and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accelcsduy4m:. c z6ff. ot*mglol*s 0sa35eration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on az7uf;cl3 os*g -hon) w frictionless surface. n3*l so co g)f;z7huw-(See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m 75t h7n nbee:t.v2.xe6qlj mfare connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension 5jn7ee q.x:h 2 7 6nltbm.evftin the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) Id3 u(i e( tie/4ffnvl8f the forward force on t/ 8e(lvn itf3fi(e4du he more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pull 4/nsy0 m3zjsyey as shown in Fig. 4-5. Box I of zyj 4nsmy3/s0mass
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 jr -i4z,-g9vhxp:, foc p nz6gand 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 axfzgp ,j: -cg6n 9o -4virh,pz 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic fric;3t 8yuko eu+ptions for plastic on wood are 0.50 and 0.48epok+ ; uyt3u0,
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 comes to ak/rf 1oz3+hx f; a3hdw stop with a constant acceler;rhf w3d +x o31fa/hzkation 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 fdm0*9yc z30 dvhlzd-sxky )3 yorce. A 3.0-N friction force retards the motion. What is0mddk zhycyz) 0s3dy*vl9- 3x the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from resr, egv t*x v8xjiyo1ub.j5 ib-/*njh4t, 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 puc7 by1is lsg97ik is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck a1si7bsi ly7 g9nd the ice?

  During the investigationzlzu9c- 2r 0gy of a traffic accident, police find skid marks 90.0 m long.lc 2 rzzyg9u0- 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 the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surv( shippf009zxl5qav *7af4n face between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive bo0 q0p(a7xnsv f*h flv9pi4a5zx 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 ud jx5md55c (ysurface between the more massive bd (d 5jmy5xuc5ox 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 of static friction between the boxes?

  An object is on a frictionless inclined plane. The plqy aun14o k)w8ane is inclined at an angl) 1noaq 48uywke of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that jzf9ahp: tn(;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 smoot-+7zg(egx)b0cz2 jg5bjxs k v h 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 pl3ex1 jqf64vywhn/ vyirj(6 7 kane 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 d1 w um(4kfw,enp ma12i1 xxk,mirectly down an inclined plane, at a constant velocity ofakxm 41xi2uk w11f,(pm mwn,e 6.0 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 masq 2tti-c9nd y52t*yuw s 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 s2y(7dr9vampt 5x bg:tlides 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 along a rough surface. The ltvfq 07b )lam:d 5q.zcable attached to the log makes anzf:la tq b5lq)7m0v .d 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 at an anu3mhq 9o il0 *wk80paigle ofw0impio lqk*3au h908 $33.5^{\circ}$ 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 incl6k:zu *g0xlte8 1ese iined plane. The angle of incline is gradually increased until 0xs 6e :t18 iglkzee*uthe object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?