Which of Newton's laws best explains why motorists should bu jo3 ouh 0-5fhnyy4*xuckle-up?

  When you sit on a chair, the resultanj*r )wnv*-d gnt force on you is

  In the absence of an external force, a moving(p34ac c8l9 5td tjwin object will

  When the rocket engines on the starship NO-PAIN-NO-GA0qf -4kz)iksnu a cg 6ysmw+.*IN are suddenly turned off, while tsc qi)uk 4wa.k*ng+-ms yf0z6raveling in empty space, the starship will

  A rocket moves through empty space in a3c2*mzooh r g6 straight line with constant speed. It is far from the gravitational effect of any star or planet. h3mg ro6c2*oz 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 fallid 6b:c7lp/oj+to55f*wx u by forward. You can imply from this that the :6/wd yo i7xu55 bj*lc +ptbofbus's

  You are standing in a moving bus, facing forwar33t5 g8fyhe.nox n 2 ja+j.vdrd, and you suddenly fall forward as the bus comes to an immediate stop. What force caused ydohr3 y3fnev.g +.5xan t82j jou to fall forward?

  A constant net force acts on an object. Describe the motion of the objkd/7vyz96:5c n :zgm v+wknbhect.

  The acceleration of an object is inversely propo*bu u9.v jw*pf 58nfwnrtional to

  A net force F acceleratese t-..ohmv zel cvid2ok- 02z; a mass m with an acceleration a. If the same net force isi2 ozhcl-eo vv.z.2-mdk0 te; applied to mass 2m, then the acceleration will be

  A net force F acts onqi cnrv;*tl /0;qca1f a mass m and produces an acceleration a. What acceleration results10q;fcrnc /ai; * vlqt if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Thisqdn)bcuv2 3pn*h9f m7y z ud)td9b:(o is an illudu2fc7 9 zyn3v)*h dt)bpu: d(qm9n obstration of

  Two cars collide head-on. At eve7 t*6qz:i9m1 duft1 be g: .cp2xzdtsyry moment during the collision, the magnitude of the force the first car exerts on the syfmb6 7* zdtt.g: 2qce:x1 19tudp sziecond 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 objecg ntm- -xr/5p5bamyk g,6 6oyqt exerts on you wix5na kgyb m ,6pq6r5--my/gtoll

  Action-reaction forcesc /w+xk,rbl v 85x8wbr

  Action-reaction forces ar*a 6e5swcm r;z (q(cyfe

  A 20-ton truck collides with a 1500-lb car ag7 xr+f18lno ynd causes a lot of damage to the car. Since a lot of dama+flx18ngryo 7 ge is done on the car

  An object of mass m sits on a flat tm(w2b qhl t;;oable. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction fol( wo q;mt2b;hrce?

  A child's toy is suspended from txy2q(n*cm, vht dg 1w5he 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 qyc*n, 5mw1h2v(gt xd is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The1 varg 7b mybv /6as;2ym(nnx2 ball hits the bat with an instantaneous for n2r mvs/y 1gnmyb(7v ba6a;x2ce, whose magnitude is

State Newton's threed c *ot:x5ew k1tx-m:7anu;h wzgl7v 7 laws.

  Mass and weight

  The acceleration due to)a)3 ovg3acoxa25pp4qhif 1 o gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on th)haa31ovx5o 2q4aogfp)ci3 pe Moon's surface, compared to Earth?

  An example of a force whichu,kdv9 4g5t o2eclpo, acts at a distance is

  Who has a greater weight to mass ratio, a persup-r ,o4imrxd*btop os ,.1s(mp3l 3bon weighing 400 N or a person weighingrpb *3mlpbi -.dx(o ro,4ut so 1p,s3m 600 N?

  A stone is thrown straight up. At the top of its path, then2 tdz w2nd8e8fu5l/oh 0fsf ( net force acting on it il 8nw2dfd5ze s/tf(o8hf 2un0s

  A 20-N weight and a 5.0-N weight are dropped simultaneousl5 gr2pal 4vyt/y from the same height. Ignore air resistanc4v typl/r5ag2 e. Compare their accelerations.

  A brick and a feather fall to the earth at their ry5* - imz1e9+tsx xcpmespective terminal velocities. Which objep*c-isetzy5 91mxx+ mct experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevatoroee4b4d8 xx q2. The elevator ib o84xde q42xes 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 anr xcx8.1rfvc 2z*d/ jp elevator. The elevator is mov2* dr1j/vcx zcp8xrf.ing upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk4 : )5f3vabklphs d4mv is

  It's more difficult to start moving a heavy carton from rest than it yy++,0cpoikl is to keep pushing it with constant vlk +oicy,p+0y elocity, because

  A horizontal force accelerates a bn4ub)xvblz/ 2a cx,-box from rest across 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 haz/n2b,vl )4ubcb x- axppens to the box's acceleration?

  A packing crate slides down an inclined rampm9 (tyv m:ie.obf4x+k at constant velocity. Thus we can deduce t9(km bvy:. o tmie+4xfhat

  A block of mass M slides down a frictionless plane inclined at an angl -146geiy4,jenpn psve q with the horizontaly n,4 p16njes4i -pveg. The normal reaction force exerted by the plane on the block is

  A block of mass M slideme+ea64;eaj niaje 1nk 70f *hs down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blocknf0ken;a1h*e +7ie 6 4maejja is directed

  A block of mass M slides down a frictionless plane inclined at an anglec+sh1x r8rw:t.86;4*bahbsykk u cw a q with the horizontal. Thesh:uh+ayrrcw 6 bcs*kx1 8b4k; w .ta8 gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are res +i 3x84agqsaleased simultaneously on an inclined plane that makes an angle of 30e with the horizontal3as+gaqxs4i 8. Make a statement which best describes their acceleration after being released.

  An object sits on a fric zu;*z bvnnvtow 5)5e;n-u(nftionless surface. A 16-N force is applied to the object, and it accelerut*wznz5 un;n5(- ;b oevv)f nates 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 y3of/r qv/ 5tfs. What is the average forwarrtof y/vf3/5q d force on the car?

  Starting from rest, : -.h) mceef)sh0cj,s6cne5 nptzf j6a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting ohe) cc6-mcf,pt0js 6 n s)5.efhzejn:n the body?

  An antitank weapon firespb3 g43 h9 nfbw8ruh+ a3(leggjd7gh7 a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveh haphu(8nbgl3j 3bg9+7r ggw7f4 e3d ling
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 c w3 ,y-(nc0oy5+u+rpua zkc xthe same force that you push a 10-kg mass from re0u yo3wyc+rkuc zac+5(xp -n,st,

  What is the mass of a person who we2n0rc9;nrkz(-fyc,m ln o k (pbdl9m1ighs 110 lb?

  What is the mass of an object that weighs 250 N olxyc 74k9tybm (h2t4mn the surface of the Earth where the acceleratmx9tkmy2 h7(y4lc b4tion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object o i nq0g: dqj6ch/- s)sjtf56vcn tht / 6vjqhn5ifdsc csq)g 0:-6je surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Mocdxnn4j 6e3 +qon's gravity is one sixth of Earth's. Compare the masses of the o3+j4c 6xqnden bjects.

  Sue and Sean are havinq 5gqfuefwj--;9f 9+p rvc; lb 4l0gfag a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's forcef-l f4 v bcj 0gfu;gp -99qqwal;f+r5e if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level k -9x1tr:lrs10vra msfrictionless surface. A force F acts on the stack, and it ax: 09 ls 1ksvtr-1armrccelerates 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 stl px*p,6bj1om2wa4up ands on a scale in an elevator. What will the scale be reading when the elevator is acceler2 aop wmbp x4p1j6*,luating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass ofuo aa27ce2 dne0+ c7gz the person is 60.0 kg and the elevator accelerates downward ene2cz2 d7a7ogc0au +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 60.0 riq lw- c,x,8tpbf1q:kg and the elevator accelerates upward wi ipx,-q w,8fqrlc1tb:th 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 has a magnit3iq cu;szx k- ,2*fzym kx3m:jude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the ma; ,z2kmqc xfyszj3 k -3imxu:*ss?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in uew.g;o 5w7hjszi3+ uplace by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck i .3 jh;u57e gwio+zusws 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 kgrfzoh )srvf r/h8*:h/ 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 time if the load rsr/f* /8zfroh)h h:vis not to slide forward into the cab?

  In the Atwood machine shown in io bjy- .nj42sFig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration nojb4ijs y2.-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, whaql9m whx)s.+ jhvr9r)t is the tension in the string? (Ignore friction and the mass of the pulhhxr.w+ 9rm)jlq9s )v ley.)

  A student pulls a box of books on a smootm58p:z1leil:fht9 eb h horizontal floor with a force of 100 N in a direcl95zi1emfptl:b8he :tion 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 for j*c l b5, xgnom-atxueh--i.g ir453yce 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 on the at,rne5oxjb---ig.* 3i5 yuxhl mc 4 gbox?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2.:ytndo f 8bv: zgossq)za( /9:3exat/ What are theb gze/9 xday(zn a/o:8stosq): vft 3: tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massqu3.b3i ktft r.7jh/z of the traffuhf t33zj/kr .7it.bqic light?

  Two boxes of masses m and 2m are in coaxhvh 85 x(()jkxch+mntact with each other on a frictionless surface. (See Fig. 4-3.) k()ch 85+ ja hx(xmhxv What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each4 swt6pyx2 jmvu,7t5q other on a frictionless surface. (Seetv42ju,ywmtx7 5s q6p Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are conneci 9 byy hnp+wnn)(exlo70*) mxted by a rope. (See Fig. 4-4.) If the forward force on the+)nl)o n exyn9m(7wh p*x0y ib 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 l qau zj.c91f2Fig. 4-4.) If the forwardl 1zcjufqa. 29 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 pulley as shown in Fig. 4-5. Bxbg tl;09. eglox I of masl0t9b;x. g gles
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 frig9r,nce9up ) ictions 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 is applied tou 9gr,e9ic )pn the box?

  The coefficients of static and kinetic friqy/k0xiabo rt8 cl)/:ctions for plastic on wood are 0.50 and 0.4qtx/ 8o/ ir:k0alc yb)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 agllf*v 18/ dbzzmt(u3 level surface in the +x direction. It slows and comes to a stop with a constantd(u1b lf*z /l8vtg3 mz 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 +bvco; pi4 7zno2pdv;pulled by a 5.0-N force. A 3.0-N friction force retards the motion. obp4 72 o;idvzn+pvc ; What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, atha;u t2l m2z*l-x jsr;y3l par i;2i7u a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, p ps)g5hqxrbj7h.:ubv ;:8s ta puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of x u phj 8)q.rs5:btg:7hv; spbkinetic friction between the puck and the ice?

  During the investigation of a traffic accident, pol1cwus-*+og: kmq amp.ice find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to gksmpw*ca u+1:. oq-mbe 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 5 ,lifdg(o:rz2qgiz2 3m are 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 f5i:o, qz 2idf l(g2rgzriction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweeiqm:.lm(ont cvt-rrb1p8l g av 2 11q+n the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massivir1orqm-: (l+ab2mcn lpv 1tt8q.gv1 e 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 izpfp:fjx7/-a/ bte0u4 s* db ynclined at an angle of 4b ay/ -tdxsj:bp* ze7pu/f0f$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes ant*3sg 5)pln8aiv7 xma0c0z m n 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 k 3iu0 d7p frzn7yt,dl/vi-r5smooth 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 smoothsnza,4 hl;e 9gso a;.p inclined plane 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 jp e qr.(hv2q26 -twozq3vg3can inclined plane, at a constant velocity of 6.0 m/s.p6v- wh2q. o3t2 q(vcqgjr ez3
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 down a rou ; km+rv .5s4.yzsy0q hm/n+rwno c1degh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slide,x1(mxzy ek/nn7e*r;d9wfq k s 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.b)cwxgxr9;ih .mgnx8m7 x2b7 The cable attached to the log makes an angle of. b9g2hm7mx;xwxcn gri b)78 x $30.0^{\circ}$ 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.iw dz/ smk8.hjto e:0 on a rough inclined plane tilted at an anglewe8itk jo/. zd:m0s.h 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 anrzxn48/u,;4ejh rvcbq k 8wp5)nm2ii gle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the 4q m,pxir5zv 4criwu28e kn ) nh8/j;bcoefficient of static friction between the object and the plane?