Which of Newton's la. so1ek-19j1gzw yk ddws best explains why motorists should buckle-up?

  When you sit on a chair,y2dkzegt6 lk r27g) i6 the resultant force on you is

  In the absence of an external fz)y ;xw4a f4puorce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN ar cg*xk,q ku1d2e suddenly turned off, while traveling in empty space, the starship w2ukdc1xg ,*qkill

  A rocket moves through emptyb wfo*v3 k68wa space in a straight line with constant speed. It is far from the gravitational effect of an 8w*6bvfkw a3oy 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, facinggx0 :c 4.ttuza forward, and you suddenly fall forward. You can imply from this that the ag4xz c0:tu .tbus's

  You are standing in a moving bus, facing for,mi :-2 wgjancward, and you suddenly fall forward as the bus comes to,m njwi gc-2a: an immediate stop. What force caused you to fall forward?

  A constant net force acts su ph*lef:u3 r8ufy4 +on an object. Describe the motion of the object.

  The acceleration of an object is inversely propo vo5s z/j0c/bjrtional to

  A net force F accelerates a mass m with an acceleration a. If tuq p*8jcsv46at+t -ey he same net force is applied to mass 2m, thep ts*q ctje8a-6v+y4 un the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceler ;0-n7osm+tpcvz+ ,s lpcta s+m5ydt(ation results if a net force 2F acts on mass 4ptzo+ y;5tsm dvl asp,7n 0c+m- +(tcsm?

  If you blow up a balloon, and then release it, the balloo/- gab(xfqt2i n will fly away. This is an i b/gx2f-tq i(allustration of

  Two cars collide head-on. At every mo+jj.6pr) pkd 3 g+itjxment during the collision, the magnitude of3.j 6pgr+ pj+xtdkj )i the force the first car exerts on the 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 objef 0vlyq+ l g-whlh3c3 zn6-o9xj(rc1fct exerts on you wiflg(v - cx 6 93-lfn3hrhlowz10jq+ycll

  Action-reaction forcesnj, )u)g1 tsm9pf 5:.q0fmhlfv a.sa0h6 cgsp

  Action-reaction forces ar3 u:pzx9jmt5v jht(t;*l:u wye

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage txafdc1/v* sk ))cnt .e8n mv8bo the car. stnvc m)81v .b)dkecx*a8 n/fSince a lot of damage is done on the car

  An object of mass m sits on a flat tabl/ 4nil :lrdj j-2d0zg)to1cine. The Earth pulls on this object with force0to 2i: n)jr14-/jld indlzg c mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string*6 w73mnbjyz 0fprb3 k. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "acfb*p 7n3zkr6b0 j3w mytion force," what is the "reaction force"?

  Your bat hits the ball pitched to you wi8ypf :97ou 9b) dox culek+6qcth a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnit7u)kf xq+o9e ccd96yo b8:plu ude is

State Newton's three laws.8y jpac8(/ia e

  Mass and weight

  The acceleration due to gravity is lower on the Moon thscrvo f+8l05o(g0b b van on Earth. Which of the following is true about the mass and weiglso 05obvc8 +0gbvr f(ht of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which ,.k y48khlixs 8c5sttacts at a distance is

  Who has a greater weight to myn ay),k fqx+2ass ratio, a person weighing 400 N or a person weighingaf) y+2q,k ynx 600 N?

  A stone is thrown straight up. At the top of its path, the np cn7. n m63dct(:nmfkwj:7 mmc/xj(ret force acting on itcdn:w j7 :tmmf /nx.((cmpncm3k r76j is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sam)nxt rp0d,ao2e height. Ignore air resistance. Compare their)2xn p,dao0 tr accelerations.

  A brick and a feather fall to the earth at their respectu/f5yo 9ixp8 xive terminal velocities. Which object experiences the greater force of air fr9yuox5/ 8pi fxiction?

  An object of mass m is hanging by a string from the ceizgfwp6bb2: 5-0ak bjsfaba0od)(q z,ling of an elevator. The elevator is moving up at constant speed. What is the tension in the string?,w6 aoqb0:b-2spzbj(kabdg ) zf fa5 0

  An object of mass m is hanging by a string fromu sseu8j+/udk 3a/um + the ceiling of an elevator. The elevator is moving upw eudu u 8mka3/sus+/+jard, but slowing down. What is the tension in the string?

  The force that keeps you f ee;4l0p sdj;rrom sliding on an icy sidewalk is

  It's more difficult to start moving a heavy cawubfztmp 70ig4./by )6ud6 glrton from rest than it is to keep push.ygtumpu l/d w46f) b7zgb6i0ing it with constant velocity, because

  A horizontal force accelerates a box unm7 9cgjki 0i-4z5ygfrom rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain 5j0g 7uz-kn9m4yi icg 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 g+-)axnq) r i6-gvzjmconstant velocity. Thus we can dedu+q-6vgxrz nj)) i- gamce that

  A block of mass M slides down a frictionleqwc u(f/,xi/ bss plane inclined at an angle q with the horizontal. The norma (bqcw u/x/fi,l reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with ,(5 r jexrq5kmthe horizontal. The normal reaction force exerted by the plane on the block is directedq r5mxrk5j e,(

  A block of mass M slides down a frictil8jw0a8txbwo1 c,8 ilmmcd 4/ onless plane inclined at an angle q with the horizontal. The gravitatio1lwx,m/bcl tc8i48d0w8om janal force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneaai ot:7vqie47n(s -xl1 mn5uously on an inclined plane that makes an angle of 30e with the horizontl ax7etn(a5 vom iuq1-s7 n:i4al. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the i4iikm1cur 3+ i(:lkn object, and it accelerateslnk34i1: ri(imkicu+ at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerau;.dwpnols:a-0(m j5x r8gfjte from rest to 27 m/s in 7.0 s. What is the average forward force on the car?furgj.n ; 0da(wx-8jpo ml5s:

  Starting from rest, a 4.0-kg body reaches a fby nh ac 05903vkdy;en)t.k lspeed of 8.0 m/s in 2.0 s. What is the net force acting on the v.;9 ade0 )f03yb5cnlhkt knybody?

  An antitank weapon fires a 3.00-kg rocket whi,((q yw *kun;rg kp.rich acquires a speed of 50.0 m/s afteg (k*;,kyur. irqn w(pr 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 samu l2wjl: q a xgjk.(xyz9 9-x*yd-qt.fe force that you push a 10-kg mass from rest,y9u-l.xa: ( .xfqt w gyd*ljx2kqzj-9

  What is the mass of a person w (q putk403px*niim dors(7i,ho weighs 110 lb?

  What is the mass of an object tha9w 2 w c-dssko+i-aqer:ej3y5 hw ct1/t weighs 250 N on the surface of the Earth where the acceleration due to gravity isewis:9 a w rcdk+w-ht 5213eqyo/cjs - $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What isx 3fo4h:q4hcp the mass of the object on the s3 h fcqpo:4xh4urface 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 umea 2)j k(xve9 iq0x/object B weighs 40 N on the Moon. The Moon's gra9j( /uqea20xk)xi v mevity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are havetm6w9iu wk72 ing a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Su2w9uet k iw6m7e pulls 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 level frictionless surface. A force F atwakqe-dy6eiq.2)ehg7r 06 kcts on the stack, and it accelerates e-w.qh0r7y e2d6k6 ik)t aegqat $3.0 \; m/s^2$. 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 stands onfy 4zt/qkts(yn )8t e1 0v c7jwkx)db9 a scale in an elevator. What will the scale bt8x0kbdy wtsnqyk1z jte )cf 97v()/4 e reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. Iqg a 6jcppzbs1v4x,: 2f the mass of the person is 60.0 kg and the elevator accelerates downward w 1a2 p vjb4sp6q:cz,gxith 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 mnq/ 5x)e s:/fimysnd3 l kqm1n.1lv+pass of the person is 60.0 kg and the el.m/11/dp)nk:sne m s 3f+5 qvxylin qlevator 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-kg mass. One force has skf v:53bm-bg ip, i,aa magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. Wmikgs,pvba3f-i5 b: , hat is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbefqh-misl v:1z z4a,vj gc4+ p:d 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 l j::-pvh,m cz4gqfz4 las1+vioad is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatg 5gyvd2q;:-lc39ok7ybwxiin82;zzc kjp. y bed 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 is not to slide forward into thc:o2 pywk-g k y5gqb9y8;2nzdi3cx.iv7z j;le cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.4e 5ya89z *hqv7s:h:qopgl6a m 0 kg, what is the magnitude of the acceleration of the system? (Ignore frictio8zq oh5ey9* :qhs:6 7gavpamln 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,ad fgt:lg.k( , what is the te, ggt f.a:(kdlnsion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth n+:9)je*fklbs lu6mj5ydw0pu gp 99k horizontal floor with a force of 100 N in a direction ofe)lp9fwgu5dm * k6+9n u j09lyjpk: sb $37^{\circ}$ 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 wiqxw8uf4o im nqb ;4/i*i2a un2th a force of 100 N in a direction of 37.0e above the horizon; niunmi4 oi*4xu2/8 baq2fqwtal. 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 byiy-(90,w7/f rwnjq*qzppcrk two ropes as shown in Fig. 4-2. What are the tensions in the ropes?c/ k, 7 fr*zww(jpnpq-9q0iry

  In Fig. 4-2, if the tensions i:v fyi79iocz/ n the ropes are 50 N, what is the mass of the traffic z/o iy9f7vi: clight?

  Two boxes of masses m and 2m are in contact with each othervw:5 aeh s82z3*vel+pd oc t6vmq2/ir on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the moc/ hvd w8e3 6liaro25svt +:m*2qpevzre massive box?

  Two boxes of masses m and 2m are in contact with each other p (bxh5,frsl7 lt6p(fon a frictionless surface. (See Fig. 4-3.) What is the ns,pt( rhfl(l 6p5fx 7bet force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fiud sf+0eaz8gxjix*(6gh5: lb g. 4-4.) If the forward force on the more massivex8fs5ghg *(a:jb x d z0le6i+u box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a u,u2cmgxxa6 *xelb 5gc *9: angil.c/rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massi anb lm5c:/2gxg ilx*6*x9 ,au.cge cuve box?

Two boxes are connected by a cord running over a pulley as shown in Fig. c/ -*bnaz (h9nt,lbhq4-5. Box I of malczbn*hba ,/q - h(9tnss
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 f*(go ua:f6k ygrictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectivelya6:gku( g*of y. 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 frictions for plao+ s zwbloyp)i-k *;i5n1 -azestic on wood are 0.50 anwy +ioi)n51zez*ao ;lb-p- s kd 0.40,
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 ld46r-pw i j6r(dqk1t qevel surface in the +x direction. It slows and comes to a stop with a 4rk p(6d rwdij1q- q6tconstant 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 forcvjmc4pt1r o w0)3okl/e. A 3.0-N friction force retards the motion. What is the l)4j w/ort1kvp0cm3 oacceleration of the object?

  A horizontal force of 5.0 N acceleratesxiz55sf: sk1a 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 m/s. It slidb.k1z 5e oxa jdo,8mc5es 50 m on the ice before it stops. What is the coefficiebao x5md,z1o5ckj.8e nt of kinetic friction between the puck and the ice?

  During the investigation of amq/-cj9g 5mag4.l/ sjta5ks r 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 4sjs qr l5 tag/9am/.-mkj5cg0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m artrrr ob * 4)f,vh,bdo9e 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 on the less mash rdf)4or, ot bbrv,*9sive box?

  Two boxes of masses m and 3m are stacked wgcuh+p.qr6; . (See Fig. 4-6.) The surface between the more massive box and the horizontal sur .6 cpur+qgw;hface 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 frif *k;uayt 9/u3ag i6cectionless inclined plane. The plane is inclined at an angle of* f ;e93gua /k6tyaicu $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an yc;vqv;tg6t9g7gu0e 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 +;)/plbe;iop / hnl f3q8nuwkj7fpg3 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 inf; d cg/ h-lh7edkk82zc huh4:clined 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 slide(+ )nd7mwy dw,y +zql6 qpm,ecs directly down an inclined plane, at a constant velocity of 6.0 m/ m cz7+)w,dw,qney( +pdmq6lys.
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 rough km,;+ele(jkn jg to:cao ()yep/3mm*$37^{\circ}$ 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)2b2+waw5kc/bdn hty wnnl14a+a)bb,2a so 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 weighingiyyxu8y ;6c3 hf 2qav-s4x m:d 500 N along a rough surface. The cable attached to38u ysxy:-dc fh4y6am2;qvix the 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 relea;k+wrn ,s4os *9 gnlpzsed from rest on a rough inclined plane tilted at an angle g4n*rok ln,p w 9ssz+;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 angle of incli 4o7wy td+8 x49noyfneadl*k .0xz0 rene is gradually increased until the object begins to slide. The angle at which this occurs xkd e8e49 oyf0tz0dxw rn+nao. *47lyis q. What is the coefficient of static friction between the object and the plane?