Which of Newton's laws best explains why -7f dc (u2 1 y8xrhywgqin-7ku2 mz1zimotorists should buckle-up?

  When you sit on a chair, the resulta o*l6imb7yd7xdq z1 s16so z+ant force on you is

  In the absence of an external force, a moving object wiksasr; w/w p6n,ozl+: ywctt0-pet4 +ll

  When the rocket engines on the star/pdl (v+o6; donlait1ship NO-PAIN-NO-GAIN are suddenly turned off, while travel; a+dl(o16 p/ditlovn ing in empty space, the starship will

  A rocket moves through empty space in azmu1lk69on d7g4 pckq2m/0du straight line with constant speed. It is far from the gravitational effect of any star or planet. Un4pu6 kdm z ng/kl2co10u79qmdder these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a movi (7iz mmdkn3b)xuy5q3 ng bus, facing forward, and you suddenly fall forward. Y5z3yi3kmxd ) (n7ubmq ou can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly i+k9b udn jx,s3o upn+1+iz2efall forward as the bus comes t xnjisu +e,kd1 n9+puob +i2z3o an immediate stop. What force caused you to fall forward?

  A constant net force acts 6x rz6( mfom43qizid(on an object. Describe the motion of the object.

  The acceleration of an object is inversely proportional tor*s18ymcy mpt;0jp wzgk,23m dvo-pz 3av5z6

  A net force F accelerates a mass m with an acceleration a. In fvklv2ys 2a3n ,cg 7v65.qnif the same net force is applied to mass 2m, thenvk5y72vn3qicangns v f,. l 62 the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratbfu/f m:di q64ion results if a net force 2F acts on masdf:bm6qiu/4 f s 4m?

  If you blow up a balloon, and then release it, the balloo k4rr4j0my/ cnr3gal, n will fly away. This is an illmc3kjy0ar 4/ln 4,rgrustration of

  Two cars collide head-on. At every moment duringr 5/z avrx lsai9tej7/5ea39e the collision, the magnitude of the force the first car exerts on the second7 5 vxa3a9alz9trie/ /jerse5 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 exe+t4nph d 1j3ixd cj-q/rts on you wil/t1xhjjn3pc+4d q- idl

  Action-reaction forcei z:jk5f1 g2m,f3dr els

  Action-reaction forceyz- g8 b*(*wp- a3cynv3ps scw9mcul /s are

  A 20-ton truck collides with a 1500-lb car and cau-(o- g*bl unzfx)ijx+ses a lot of damage to the car. Since a lot of dambifxz-*lx-n+ u og ()jage is done on the car

  An object of mass m sits on a flat,hm, mdk do,5rsh/8oc3sqj x7 table. The Earth pulls on this object with force mg, which we 7r5 ,, mo mhsk3d d8ho/s,jqxcwill call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by m :b i.fu4m9ffaeans of a string. The Earth pulls downward on the toy withm.f9 :fa u4ifb 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-g0kgkki -8-q8bl wz1c 0fbfr 7N instantaneous force. The ball hits the bat with an instantaneous force,wfg1 78zclbbikk kgrq 08--f0 whose magnitude is

State Newton's three lavqqg 1e+7dq j(7 i.uncws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than onqp)xg d5em 1 +2yew3oq Earth. Which of the foll+)2p qy qx1gmdew5e3 oowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts atrmi e/tz+7y;f+oad4jjg:b t . a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a pvvb3n hb hg:fmb4)3 t*atb3,c erson weighing 60h h,nfb)ttg *v4m:c 3bbv33ab 0 N?

  A stone is thrown straight up. At the top of it.j t1sa6tz- djsxjc (2s path, the net force acting on it xt1 d jszas-j c62t.(jis

  A 20-N weight and a 5.0-N weight ara(r;prohx ee-k* ggp-icz+0u w 57q1e e dropped simultaneously from the same height.-kau(;5 rq-icx01 ehep o7+zepggw*r Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth atiyvgj04 wgrc/vprl8 ua.t99fry(917k4kv l u their respective terminal velocities. Which object exrw/ 9akl4vf tjprg4 i1rcyul 980.v7kyuv (9gperiences the greater force of air friction?

  An object of mass m is hanging by a string from the cei+yxcahu0+(r 2ral1 a qling of an elevator. The elevator +au(1a0 + rc x2layrhqis moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from l m0j4e/sv kd)the ceiling of an elevator. The elevator is moving upward, but slowing edl4)mjs0k v/down. What is the tension in the string?

  The force that keeps you from sliding on an icy s jsy 0*adiv egv0(n3)c w8gt8ridewalk is

  It's more difficult to start movivs-yb 9t ggg59ng a heavy carton from rest than it is to keep pushing it with constant velocitgv- 9gg 59stbyy, because

  A horizontal force accelerates a box from rest ar9c stv*( 2cj;f w)nuei:y 1x hta)a5qcross 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 doubled. What happens nhq9v)tie ja u :5rs*2ca1;cfw)x (tyto the box's acceleration?

  A packing crate slides down an g x*-4jj 2ltw /cpy88im(eoziinclined ramp at constant velocity. Thus we can dedz lmcix/- i(8t w8oj y2ge4*pjuce that

  A block of mass M slides down a frictionless p8yyzgbs :7 de)))by vflane inclined at an angle q with the hg)yefb d)z8y)vbys 7: orizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless pla+bpqi le 5 meyjfhc /2b()jm76ne inclined at an angle q with the horizontal. The normal reaction force exerted by the plane onbjmcq7( hf 2 )epyb6l/ +jm5ie the block is directed

  A block of mass M slides down a frictionless plane inclined at an anglm-fynh6 glb4 1+cl*gg e q with th 4h6y+mgl c1f bl-gng*e horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are ret:tgsg ant32l:s:j +oleased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best 2+n g:tltta s:so3 g:jdescribes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appliedeh9w-/) zjco eq i6zd* to the object, and it accelerates aw-h e 6ejz/i )*zocq9dt $2.0m/s^2$. 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. W a/-/88gpfg ampw+ea+wdjgs +hat is the average forward force on p 8 j+ms/gg/ad- ewgaf++wp8athe car?

  Starting from rest, a 4.0-kg body reaches a speed yqar-cl4,1o1 uqx8jt of 8.0 m/s in 2.0 s. What is the net forc8yt4-ul1a o,jqxq c1r e acting on the body?

  An antitank weapon fir6w5hsdn*p - drj d,4taes a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveh,nd4r 6-j pd5 s*twdaling
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 rd9: 0d i4,lx5jpqh)g:2 h mo-fikfr rvestf i lrpgk94-d: qi,fdo : )jm02vx5hrh,

  What is the mass of a person ww+ a.a6mblywstvbw68. c9ai dhjj*) *ho weighs 110 lb?

  What is the mass of an objecwn4 q*t 8dhzcx8jk/ 1et that weighs 250 N on the surface of the Earth where the acceleration due to gravity 8e*8 wd t1jkx c4hzq/nis $9.80m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass ob*-ux)d l7)ratz (ejn(as o(mf the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the ) - m)ea*a7nsbd(rzoj(xutl( Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moon'si36gt-4lqe u7t oi 2qg gravity is one sixth of Earth's. Compare the mast7q6l gqi2g ie3u 4-otses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-k *hh6.4,pfsscnwf1 ejg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue js,h *.p 4hwcfnfe1s6 at $2.0m/s^2$?

  A stack of books rests on a level frictionless surface. d72y opjrb)n0 )yz- 5u/z09 qtti iannA force F acts on the stack, and it accelerates i )-iyj70 p /)bqnt9 ro un2nya5z0dtzat $3.0m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0m/s^2$. What was the mass of the original stack?

  A person of weight 480 N a0 gfsyy) (or-uhv(xy dc8* .bstands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwarbdg*y.-r0 cfx()sauyh8 ovy(d at $4.00m/s^2$?

  A person on a scale rides in an elevator. If ybq 1ow.o u4p b6l),hithe mass of the person is 60.0 kg and the elevator accelerates downwoob lb.uiwqy)6 4,p1hard with an acceleration of $4.90m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person is 60-hibqnos4:9d0ak qqm k 4dm .8.0 kg and th-0.4 q9ids4 8b omhk:qm dnqkae elevator accelerates upward with an acceleration of $4.90m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force hqrs7qym)c 88m;r k 4(1 b pmpl7)mpilh i3egz)as a magnitude of 8.0 N and is directed due north. The second force toward the east has mz i8pym4msr ir;phc1)( )37bqmg)el pk 8l7qa magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed obsujpz) ;dz d12ql 7ei-o2wo2f 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 loo2do2-e bs1pw lzuidzq; 27j)ad is not to slide forward into the cab?

  An object of mass 6000 3q azc n/k4ko6;0m2y nh)vtqf kg rests on the flatbed of a truck. It is held in place by metal brackets that ntkvhmya6k/2fq)0 n ;o3cq z4can 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. 4-1, if M = 0.60 kg and m = 0.40 2g6w8oxqh *d 9o;muilkg, what is the magnitude of the acxom96u;g2 l*d8oqwi h celeration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4,(.cd4y7q;bqx r ;6yvx:wp2kpy gkg t-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of thexg6:74 y.,wbpy c(rq2;dqvkx g;ptk y pulley.)

  A student pulls a boh4i(yrmbeee1 94 *qtf x of books on a smooth horizontal floor with a force of 100 N in a direm e(1t4y reih4e 9q*fbction 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 smo0 iy)6y t,agagvy+; ncoth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontalyt 6y0 ,ig+aa)ycvng ;. 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 shown in Fig. 4-,;s tfovb -up,nulx7 7q8a.yf2. What are the tensions in the roxn; q.p -7uf78s,alb uf,vt yopes?

  In Fig. 4-2, if the tensions in the royl7e7gl,h6 l vl+a9g sq2oxi(llg:+spes are 50 N, what is the mass of the traffie9 y7 sloia7(l l vl:glhs+qxlg6+2g, c light?

  Two boxes of masses m a hsk 84eso z5u30qrba7nd 2m are in contact with each other on a frictionless surface. (See uqs5 34 kehr8 soz7ab0Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each orucg-e ks2okc3*)u,m ther on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive b*cuues)3grk,ok- 2mcox?

  Two boxes of masses m and 2m are connected byx5tds9ah g.4 1 ujt:fu a rope. (See Fig. 4-4.) If the forward fo9j5 1ht:fg4. t xsudaurce on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the ftuto:6v82c ct orward force on the more massive box is F, what is tht c 6vu8:c2otte acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in 1y,0j-xhqxbd )a k2hu +m -iwjFig. 4-5. Box I of q-k j) x,i1+uhmyhxw adbj20-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 3.0l+t ussm*kv9l::+aik /)gxy a -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 is applied to theasks x )k :9ita/gumv*y l++l: box?

  The coefficients of static and kinetic frictions for ;9c*kwmextb 0 1g1 .9ibrvyyaplastic on wood are 0.50 and 0.40gv1w kae9.mb bcyri 9*t0yx1;,
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 surfax9dim/9f k7twce in the +x direction. It slows and comes to a stop with a constant accele99 x ktf7wimd/ration of -$2.45m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surfacl+yf8 0qd 6p rl0miy3je is pulled by a 5.0-N force. A 3.0-N fr0jy+fql rmi638yd 0pliction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, . nh e0nspghg( a-7sh/from rest, at a rate of $0.50m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is gim*vsdl;bm x ;(ven an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coeffic vmml(b ;*dsx;ient of kinetic friction between the puck and the ice?

  During the investigation of algti/n2 1r il/ rcc1l/ traffic accident, 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 tit grllcr c2/1/l/1i nhe brakes were applied.

  Two boxes of masses m and 3m ar24psf,m0 ayzee stacked. (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 massive box, what is the static friction force a0m2 py,zesf 4on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 44vq)dc*bg r(b -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 m* ()vbgb dcq4rassive 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 4rnaeimw((zv 6ycv0t1.( 7 6k aqqavg plane. The plane is inclined at an angle 6rka.zgq tcaa(nv7e1604m (vq ( yiwvof ${30}^{\circ }$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a ef pof)t9y 9fdi/djss1g48 x-nque1 3flat 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 (sc9 qwqzhs29t b.(jg smooth 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 planek3n qlacbwi- 4/1o0at 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 ij,l2xd8ey0*n- k cn )w5xwqflnclined plane, at a constant velocity of 6l 05wlx*, 8 e)ny xwd2-qnjkcf.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 mass m slides d+8 h++hdicfn 4fv:pz xown 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 l je.-e98yq1ogjchd zu l8za,e) ,nd/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 aleoc yi79ynp,7:, hva - 5sy)qrmjod y2ong a rough surface. The cable attached to the log makes an angle )7 h2 orn a,:-qydsyyej ,i7cy5mvp9oof ${30.0}^{\circ }$ 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 ql-q6qdfn 2o +ywx2-e rest on a rough inclined plane tilted at an angle of ef +6n-xodlq2 yq- 2qw${33.5}^{\circ }$ 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 pl3ssr l(nuud (-ane. The angle of incline is gradually increased udsunur s(( l3-ntil the 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?