Which of Newton's laws best explains why motorists should buc*mhs-**t xhag40hhifi41 tr ) ,wdpzikle-up?

  When you sit on a chair, the resultant fob e2dy3 7 cc-xwb-4qsirce on you is

  In the absence of an external force, azvl, u.)myd u4 moving object will

  When the rocket engines on the 1/dolu8k x dx.starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty o/8 d1ul.xkxdspace, the starship will

  A rocket moves through empty space in a straight line with ct .vmt*vgp/wdee- b) y;exix.26 f :oconstant speed. It is far from the gravitational effect of anxfc. i ; wbeyetm)go-t:p.6*ve / vd2xy 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, facing forward, and you suddenly fall;s5u)tgqqyldg, 4;kepm 5c2r forward. You can imply from this that the r2;5km)pqeq5us,gg4 lctd;y bus's

  You are standing in a moving bus, facing forward, and you suddenl8;rov/p -dsqt y fall forward as the bus comes to an immediate stop. What force caused you to fall f /ovr8tq;s dp-orward?

  A constant net force acts on an object. Desuk.aw. hm3fspn(w- 7s cribe the motion of the object.

  The acceleration of c7 yyast(c 6*q,-o6k xeerar)an object is inversely proportional to

  A net force F acceleratzs15bx(s zu)d es a mass m with an acceleration a. If the same net force xdub szz5)s( 1is applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acca8lvtl40 nx)njt- :wvd, 0fqceleration a. What acceleration results if lvq0wnn 8avtd,ftcx0 j-4)l :a net force 2F acts on mass 4m?

  If you blow up a ballo,b ,mtj6 fq3oton, and then release it, the balloon will fly away. This is an illustra om6jtb, tq,f3tion of

  Two cars collide head-on. At every moment during thepr 8f))hq+t tjlxb2 j2 collision, the magnitude of the force the first car exerts on the second is exactly equal to the m x l82pt2fht)j+q)jbragnitude of the force the second car exerts on the first. This is an example of

  If you exert a force rgrlre7( sl5:qvq4; +a8 ,gpzimo p0zF on an object, the force which the object exerts on you willrp s+(az4;qz l igg5:elqv7 ,pro8mr0

  Action-reaction forces ojertfs l7,.o, 5ofh(

  Action-reaction forchi82jzl i 8 -wtpawzv7((l*nfes are

  A 20-ton truck collides with a 1500-lb car and causes a lot wkjr:x)g.*3-s)k p w s9lnubz of damage to the car. Since a lx9lpkrsb ).z wg3:u-s *) jknwot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls ong8/6qys4v qcf this object with force mg, which we will call the action force. What is th4cyq v8gs/q f6e reaction force?

  A child's toy is suspended fro: 8cxu ty5+lax0*u 2zlpuqkv (5nok(cm the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction f2t qnxu+c:0ukoz5 k( l(ax*ucy5v8 plorce"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. Teev 5c/t a(zo,(gq2xvfi1 h:lhe ball at (fv: h,x1q/eol2i5e( zcg vhits the bat with an instantaneous force, whose magnitude is

State Newton's three laws/qsq.n *z 4ft5ucaame p7q(:c.

  Mass and weight

  The acceleration due to gravity is lowemg7nsfgr6zo4( bbnf.k frd*d(w 9+ d0r on the Moon than on Earth. Which of the followi o7m (nd(sb6+rf b9dw*4zgd0nfgr. kf ng 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 at b0o h* d,x ,*wgqj1wbya distance is

  Who has a greater weight to mass ratio, a person weighq dq-l/*1mf+itrp/if ing 400 N or a person weighingq-t/ d i+i1/r*mf qlpf 600 N?

  A stone is thrown straight up. At the top of its pa2rbomst3k:rzbzd 2v a5vn+3 /th, the net force acting on itat 2bo+ 3:mdszbr nv3k v52zr/ is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heigvwr4vey 9:.k4 x3t /4vaa zphqht. Ignohw4era9qay /p4 4xv:v 3.kt zvre air resistance. Compare their accelerations.

  A brick and a feather fall to the earth ao9+ /fay-/oxloha s9 ht their respective terminal velocities. Which object experience//yof h 9has9oa-l+ oxs the greater force of air friction?

  An object of mass m is hanging by a string from the cei2b/nx uq80 hcjling of an elevator. The elevator is moving up at constant sxn ubqhj2c8 0/peed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. T q7pfd8j0)hyihe elevator yf0 djihq8)p7 is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy60gns w83zrfv sidewalk is

  It's more difficult to stp0dc v smnc- m)*8 ,ttdr7cp1hart moving a heavy carton from rest than it is to keep pushing it with constant 8t tm7dh),*n1- cpmpvrd0 ccsvelocity, because

  A horizontal force accelerates at30ohkzq: n01c.8 zc nsuvbo 7 box from rest across a horizontal surface (friction is present) at a constant rate. The experiment 3 sn7oozc:0z 1thv c8bnu.0kqis repeated, and all conditions remain 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 ramp at constant velocity. Thusbao;fd2 67z.erb p* tn we can deduce thaftbep;2 oanbr .z 6d7*t

  A block of mass M slides down a frictionless w)v; o xn(hn)z,74wcnlht* tc y)c,qz plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on nlwc)hy xnt*);7c 4qz tcw zh)n,,(ov the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wij6/;ey6 k6um0d :v aud1nqn lith the h6ak6d6:qljy0 vn/ 1;nemdu uiorizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incnwbj+ ,7bmo+iaord/ wyd io* ;t 9/9kxlined at an angle q with the horizontal. The gravitational force is dimbw* +ydioo jb/k9ri 7tn +x,/wod9a;rected

  Two toy cars (16 kg and 2.0 kg) are released siv*7cthvr9l2 z z ojq:5multaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accelehozl7z52t rv9c:*qvj ration after being released.

  An object sits on a frictionless surft4 tp9ql r7p+hace. A 16-N force is applied to the object, and it qp+tt 4pr 97lhaccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate fromrpzquwqy*vf 73 ;cdsh :*ge,8 rest to 27 m/s in 7.0 s. What is the av 8 sp:f u,;qzedqwhc3rv*gy7* erage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed ;ik7d id )r8dpof 8.0 m/s in 2.0 s. What is the net force ac;pd di di)8rk7ting on the body?

  An antitank weapon fires a 3c6/mm lvskv9 ..00-kg rocket which acquires a speed of 50.0 m/s after v/vk 9c mslm.6traveling
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 1v *c)rfjp olft;ftj )o63qm)(,-czpk 0-kg mass from rej); j) m *),pt(c-qtlfr3f6ckzov pfo st,

  What is the mass of a pers2b : 8.c2j8sicu msjazon who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surfayczvey 04 e7d-ce of the Earth where the acceleration due to gravity is ezc7y0de-y 4v$9.80 \; m/s^2$?

  An object has a mass of 60 kg on the-:e nx.kv e.ti 6*y*nryuti5v 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 thax5tviun:kvn -y rt*i6e* .e.y t on the Earth?

  Object A weighs 40 N on6mp58tzfd f) z Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the o5f6zp m zftd)8bjects.

  Sue and Sean are having a tug-of-war by pulling on oppo5vud db:rfc(m/ 7wo)dsite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sea(r cw5ddmvo:b/ 7fdu )n's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictim07 wkza u5od- q21dsum jy+ug2a24xb6w om-ionless surface. A force F acts on the stack, and it acceza 6yju72+i-mm wg5u2a kwxsd2mo1qo b d4u- 0lerates 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 stanpidzeh-kx2 z2w4v 2,i ds on a scale in an elevator. What will the scale be readph- ki2ixz4 2d w,vez2ing when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person g/+9kadl)kv ais 60.0 kg and the elevator accelerate9a/kdgka+l) v s downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides a6/-bdytr ehz(qga1(s 8nv /uin an elevator. If the mass of the person is 60.0 kg and a dbv//suyg 1qz(-n6et(rah8the 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-k71g,4 p lcg1mtlmzkn;(0ft mu g 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 6.0 N. Wg4ml,;nzt(0c pt7mfu m kl1g1 hat is the acceleration of the mass?

  An object of mass 6000 :k +pu-a ufrq3kg rests 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 forward into the +- fpru3a:qkucab?

  An object of mass 6000 kg rests on the flatbed ofm v/fl,v3ikc + ,fattyr6ju9 zik. *s- a truck. It is held in place by metal brackets that rv m,tzj*a,y3ki6f+lifvskuc /t -. 9can 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 sho,n*ajii ztq/rd. 6 6d/ pe+oozwn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is tdo*i/odz6ipe ,aqr /tz jn6.+he 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 kv.vs/1lm vtp. g, what is the tension in the string? (Ignore friction and the m.sv.p/1lv tmvass of the pulley.)

  A student pulls a box of books aq62qc mbm0xd y u45w;)2 4fevc;qwez on a smooth horizontal floor with a force of 100 q)4euc5c v4b20dy2fwmw qxmaq6z ;e;N in a 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 a4)nxvsy2v 759vxdpq0axx:4a f) ob vhorizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kxpo dbxf))ax 57 v4vqs a0xn v:a429vyg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown itlkf4yq x4k8nt((d.k n Fig. 4-2. What are the tensions in the (k(q8.yld t tk4kxn4fropes?

  In Fig. 4-2, if the r++ipp/ bb2v9jbvx 7t n8x sf0tensions in the ropes are 50 N, what is the mass of the traffic light?x+0bfpbt i7sv v28r/pn9j+x b

  Two boxes of masses m and 2mhqrfo3v( s u w*gus:ks**v)l2 are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bfh *wvkss*g2 lo)*r3sqv:u u( ox?

  Two boxes of masses m and 2m are inuawufb b 1d373 contact with each other on a frictionless surface. (See Fig. 4-3.) W b b17u3uwa3fdhat is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. :v* mwy0 0*tt mfu+jfu(See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in th* ttmv:j*0um0 u+yffw e connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig.+ vvvlip umlp atfku7*m92;v/1zz18f: tf a)s 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massive box +v f kul9us8lt1/zpvm:fv m);va1t i7 2fazp*?

Two boxes are connected by a cord running over a 7poppy38 v6x0 /r cenppulley as shown in Fig. 4-5. Box I of ma oe0 yvcp86r7pn pxp/3ss
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 a d*xl2lh2r 5dn b i jy49qg3xts,,tx7atesk are 0.40 and lt5j4a79tbirt,,xgx2qd*yl h n 3x2s0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic fr 9skh zeuh :s.-9i3hewictions for plastic on wood are 0.50 and 0.4shzke3 hu9. h wie:9s-0,
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 ymwb e* ega p212l1ld-and comes to aw-llgee2y1 *p1md 2ba stop 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 2j n ;mpboju()horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards tm 2j ;jo)p(bunhe motion. What is the acceleration of the object?

  A horizontal force of 5.m;cm4nw,o q; wh5b9epo h5 pbc,nht 5(0 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 9/8wnaeydd6vsh2 ct3 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 and the icha82dv9y d es wt3c6n/e?

  During the investigation of a traffic accideyz64hl6 yb4z(zei /e5 avu.wfnt, 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 4h (v./zuyfa e6z 45ibew6ylz 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 surface betwee ;wxwpneg( srs 3k5iyt;w23g5syzf 6 )n 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 on the less mas635sk5nyw 2sg ; ws3r;zpeyftgw( xi)sive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) T(zzkqqhssh p(r03;o)5dw. y a jl0;y uhe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If th z;5 (lj0y s (hh3sqwr o;dyzk0uq).pae 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 frictionly4k8pv1+t7ffaz bi9t ess inclined plane. The plane is inclined at an angle tp7fzy kia+tf1b849vof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill tha,gxeo(5i qoz / tosd7:t 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 wiul5k-4vrl1edy* g ,oeth 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 td)6 y mo7l +tj5,zkt59uyciyvilted 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 inclined**us y1 z,qldg plane, at a constant velocity of 6.0 msydzql** 1, ug/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 dows2brdv a.v1au/tanwy 7eh( s z wt0.;6n 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 donfp lz2,el56cwn 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 cable attache9 u1beid6d, 6u mlkxt-d to t61xk e9 dd lt6-i,muubhe 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 inct5k8ke) d8ih 0utqww sv/y 4x,lined plane tilted at an angle ou)vkt8dt /4e ks0ix5 ww,h 8qyf $33.5^{\circ}$ 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.rp*xgemts7kvbpd ;,4 6u4m+ d The angle of incline is gradually increased until the object begins to slide. Theus;* d6tvrxp4dp7 b+m mg k,e4 angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?