Which of Newton's laws best explains why motowoxdfaiv 6* i,,8 azg1rists should buckle-up?

  When you sit on a chair, the resultant force on you isl+mbby6dssuh:8l n3 (

  In the absence of an e, lrbm*rr d(4pxternal force, a moving object will

  When the rocket engines on the starship NO-PAIf hjqnoy1 rx2dkqm0 o)d h2c.u p*2)w.sn;r-lN-NO-GAIN are suddenly turned off, while traveling in empty space, the stars*ks-x dw2.h nr );qlo2p )rdyuo 1jq.nfh 2m0chip will

  A rocket moves through empty space in a straight line witotl5x+e, d., ef gt+xzh 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 rocket in5+t egf .,oxdex+l ,zt order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall fori33kns *4e7l :o w8qtgeg9nc no r:tk+ward. You can implynsk3ircon+3l7q e: k:g oeg t9w48tn* from this that the bus's

  You are standing in a moving bus, facing forward, and y*-i sfn4-p vwrou suddenly fall forward as the bus comes to an immediate stop. -pni svwr4-f* What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the ob va,h nhf 8n1og*vdm s,(xt10uject.

  The acceleration of an object0 v;sdxm5z u99mr .hzz is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net el)v4k6df pb869-:ufomzzd u force is applied to mass 2m, then tue)vpdk- 46l6f8ufm9o:z bzd he acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Whmq )7jz+/k+mpo yom - p0u larn*a(-ssat acceleration results if a net force 2Fk-n+z /mu7qp*s0m)+ (opa aol-jm rsy acts on mass 4m?

  If you blow up a balloon, and then release4phisy9qfq )x82 tx4cp9: vfrrqzu*- it, the balloon will fly away. This is an illustrationz x )x fp8vq:rry2*pi9qfh- uts4c4q9 of

  Two cars collide head-on. At every moment dureo6)g sv (/uzwing the collision, the magnitude of the force the first car exerts on the second is exactgzw6v(u/ s)e oly 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 obdtup7j m-u8za qm*f ; v6w9a(zject, the force which the object exerts on you wiv-*6qa pjd (8wz7 ua9;tufmm zll

  Action-reaction forces4+nvv4 ywd0t n

  Action-reaction forces a,n-(erjgtlm2 i 35t4h. kwjaxre

  A 20-ton truck collides with a 1500-lb car and cau4hiwb+ z1t f/nses a lot of damage to the car. Since a lotn1h/zb+ t4wfi of damage is done on the car

  An object of mass m sits on gpkn;/kv( 0:lish ,r*+ nt ewfa flat table. The Earth pulls on this object with force mg, whlwi:te*kr 0k g;nsvn/ p,+h(fich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a sw jght)ms5mfie .sij0 9g/9e;tring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is gje;heij9mgft/s.m05 i) s 9wthe "reaction force"?

  Your bat hits the ball )5m)ur8xeuum upph,-s3r y; opitched to you with a 1500-N instantaneous force. The ball hits tp)su x3mmrr,85e)-yuuh p o;uhe bat with an instantaneous force, whose magnitude is

State Newton's threemss 0o +f9fn20vzv p7++/cio tec6ibz laws.

  Mass and weight

  The acceleration due to gravity is lower op at3c(bp ;h-en the Moon than on Earth. Which of the following is true about the mass and weight of an astron3t;e-hp apb (caut on the Moon's surface, compared to Earth?

  An example of a force which acts e +.7jly3 q cdjo8bvqsdeh262at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or cy,8 kmpru e:/wic6t 3a person weighing 600/ pyi6 :wmuc,r8 c3etk N?

  A stone is thrown straight up. At the top of itsa8/7u ind0fkc path, the net force acting on it icafu/0 7ind8ks

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sam wbvqngo3u k ;:i11m7ze height. Ignore air resistance. Compare their a1igq1 7now mukv:3 ;zbccelerations.

  A brick and a feather fall to the n2g xw /0pt.ftearth at their respective terminal velocities. Which object experiences the greater force of air w.t0p/g fxtn2friction?

  An object of mass m is hanging by a string from f8(gowzl 8bzx1x 0do4the ceiling of an elevator. The elevator is moving up at constant speed. What is the tez 0(f db8zlgxo4xo81 wnsion in the string?

  An object of mass m is hanging by a string from t++gq 87cjo y,kp6d pykhe ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensiony7,kj+dc6py+8og p q k in the string?

  The force that keeps y 0w1-bcq1tidwkq .8hch4b lnwwez;9 .ou from sliding on an icy sidewalk is

  It's more difficult to start moving a hearwvt x; 7fo-pyei)-6c vy carton from rest than it is to keep pushing it with constant velocity, becausev i)pfr c-y6tx w7o;-e

  A horizontal force accelerates a boxuc;: j4;rx3d).wmh g jyqpyn/ 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 excyd ;q;43wgn ch)j jrux.:yp /meption that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclip 2tfz12ww+8hu (ubv *6j:btdxe 5at gned ramp at constant velocity. Thus we can deduce that bdg:f (u t*xt861zpa j+2euwbt2h w5v

  A block of mass M slides down a frictionless plane in g1d58 ys)ll. orq.klhclined at an angle q with the horizontal. The normal reaction force e 1gl.l).ykqs h rlo8d5xerted by the plane on the block is

  A block of mass M slides down a frictionless plane inqdf g)h p-w7ksf-:a1fclined at an angle q with the horizontal. The normal reaction force exerted by thed)a7w1 shf:pkffq-g - plane on the block is directed

  A block of mass M slides down a frictionless plane incl0xay;gm ncp -v-*k9kiined at an angle q with the horizontal. The gravitational force is dirikcm-; - nk v0gxy*9apected

  Two toy cars (16 kg and 2.0 kg) are released simultan4e7lb8f 2luwan+bf) w +ghu0teously on an inclined plane that make2 wb4afl+nu7u teb+ f)hwlg 08s an angle of 30e with the horizontal. 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 ob9.hayy1 slz;e o92fwvject, and it accelerates atoev9 z;.91 ah ywsylf2 $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can aq rwsvw/7n 9y9+ vq;c4btnaw 2ccelerate from rest to 27 m/s in 7.0 s. What is the average f7b t nr;w 4snq99a2w/vv+cyqworward force on the car?

  Starting from rest, a 4.0-kg bodyb0;j(dn )pgm1 qsr s;(lqe(ur reaches a speed of 8.0 m/s in 2.0 s. What is the net for1;)qsmd(u(g(b p jnrsle; 0r qce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires aj; t 7 mhi5im-2gs.p -9ioretj speed of 50.0 m/s after 9p-mij7-ost5;emii .2g hj rt 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 mai fz 3cszbn 1+zt /ac+ts(k7f.ss from resa7+ttcc/.( zkf1szi+ snbf 3zt,

  What is the mass of a person who 52 tg fk4b81) q+hsd wxpvv:b5phd+byweighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of.x * tlf7a5blt6p(zkjl3l* cn the Earth where the acceleration due (lnlal*zp6 x 3kt*fj bl5 .c7tto gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on t/3 cb2cf5rmzche Earth. What is the mass of the object on the surface of the Moon where thmfz2c rc 3bc/5e 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 Moop+ z/(dyvdqldf(7s 5m n. The Moon's gr(l 5sy/fd+zqmdd7 v p(avity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling o.cxl n;-jt*vg 8jite yg: xg*/n opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean'tnv. jgg*-c8ix /gx ly:*je;t s force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionlsq::9j* gtut3e ayf y*ess surface. A force F acts on the stack, and it acct3*qu jey:f*s ya9: gtelerates 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 stands on a scale in an elevator. 7oerg .j0xsb15 1kjzxWhat will the scale be reading when thjezj10.5ox r 7 1kgsbxe elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of thz)k+l qayb :3+gy p,bmn)v+ hie person is 60.0 kg and the elevator acceleratny:a qk)+hibml+,v 3pb)yzg + es downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale riden j;: 26natm0cdtd8chs in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward wi6dan8hn 2jm:d c ;0tctth 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 fo2o (;x6x2yxa3 )n uiuemxkhi+rce has a magnitude of 8.0 N and is direc (x32 +e;hx miian)2xu 6yokxuted due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests x ko+t:qxxf 8/lx6(lo on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Wxxo/+6 x ql:8x o(klfthen the truck 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 on the f2j fnzcym. 3)tlatbed 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 slintc 2.j3zm)y fde forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.4- y5d-nkby i +mnvzs210 kg, what is the magnitude of the acceleration of the system? (Ignore frictiozniky 2-d5bv-snmy 1+n and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and48xtf t5tbrmfa fp,27 m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass ofa2f 4m ft8t75, xfbprt the pulley.)

  A student pulls a box of books on a smooth horizontal floor w2mwb;0 zoi-av0vw8ltr1r 9y kith a force of 100 N in a direction ofv 0oywi2 klv 1b-t0rza;w9m8 r $37^{\circ}$ 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 sm0c ,ds(hyj fm2ooth horizontal 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 kg, what is the normal forcech2jf(,m s0yd on the box?

  A traffic light of weiguiq05utctdm y u,s+:x.:lbe8 3s )o ttht 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes?em8ut :.+cxdil:,tyt53uq u0btso s)

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massp2t,m xr 7z*,mr9gu ns of the traffic li 7rg2,,9mrt zn*pmsxught?

  Two boxes of masses m and 2m are in contact with each oth5 iuqq6lwdc-n wn7u7)w*7une3 fz 5pper on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive )c*f 5np6wn7qwupu7 w-ezq3n u75 ild box?

  Two boxes of masses m and 2m are in contact with each other on a fz f2-wk lh/,burictionless surface. (See Fig. 4--zl,fw huk2/ b3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a ro8gjtd-h ul -epl:t0c)wqo:)hpe. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tenwll) t0-ugp) ct-8e jdh:hoq: sion in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4d/o4h4(sthra0(,z sz j v yk*h-4.) If the forward force on the more massive box * ty, h/4hz(rh zd4vsk(0sjoais 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. Bbieaqsi;p6f(a *7r; dt l:n-s4ml: jeox I of maeln p*i;;-7:js(6lb ta rm 4:dfes iqass
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 anv,ym3fdn20etjxy4 u ,5es) zod a desk are 0.40 and 0.30, respectively. What is the net force on the box fy5v) ,ejdx2u, o e 3t04mnyzswhen a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions fa-7tasx.i 7ov or plastic on wood are 0.50 and 0.47s tx a7.ioa-v0,
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 come+ r8c,s;xc ii*qxvdj0s to a stop with a constant acceqdic8ris*,x c;j xv+ 0leration 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-No9ky5ppv 0e4 f- xhb:2 d6zzvs force. A 3.0-N friction force retar9k z4vshoy 2b0:p v 5-epxzfd6ds the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accegla6 wsgjp 70nyg87;olns0i 8lerates 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, ngth mi0.(6hja puck is given an initial speed of 10 m/s. It slides 50 m on the ice bef(0t6ih jm.hng ore it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 9y6dyn95d, eyj0.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing cj,yd9y n5y6 edonditions. 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 betweenwi3a doqzdtwwo )7/g9( 1s 8j,*l:fx9ss kr yi the more massive box and the horizontal surface is smooth and the surface between the boxes is7wq1yr)itj * (osg:skf3dwzl9 w,ad8 9x/ios rough. If the less massive box 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. (0*kwhit d9 j)oSee 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 d9tw0o h*kij)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.a5k ik )gqht/5 The plane is inclined at an angle) h5aqtg/ik5k of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hv5 3 k;ax,dpqg w31yrgill 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 smooth inclined plane with an u.zi/gax)cnxqi2(m *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 n-k0fpt ;9 61l, eaqsgiws)uvdly 5,cplane 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 * d7pi wl7bbobrm.:7odirectly down an inclined plane, at a constant velocity of 6.*.b7b wl 7p7i mb:rood0 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 maslc hfy86v/.v is 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 slides down a ro gm* * u7nuwwoi-x+oid:(bd i/ugh $37^{\circ}$ 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 weigh/9/ kbzv4i3muib crq9 ing 500 N along a rough surface. The cable attached t c/4/i9miv3b9kbzq u ro 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 released r;az.*0q p0nv; gb0vrg:f ak yfrom rest on a rough inclined plane tilted at an angle .b a 0 nag pkq;;:vv*y0rzfr0gof $33.5^{\circ}$ 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 incli- vkg;,f4p- j0oymbipned plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is qfg vk-j im0pbp4y ;,-o. What is the coefficient of static friction between the object and the plane?