Which of Newton's lap9x4rb/1 h4u 2oqqf lvws best explains why motorists should buckle-up?

  When you sit on a chair, the resultant for5;k y wufrnl0*ce on you is

  In the absence of an externaau 7j6/vi o 1cc+q0xuds77lnrl force, a moving object will

  When the rocket engines 0d-7q vs+sf (zagh t0hon the starship NO-PAIN-NO-GAIN are suddenly turned off, w0d0+hfs(av7ghs q tz-hile traveling in empty space, the starship will

  A rocket moves through2mb6qwjfc .t*5 y2dtf empty space in a straight line with constant speed. It is far from the gravitational effect of any tmbt2yf 6c5q2d*.fwjstar 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 movdse7i;ah8ptvd a 240 eing bus, facing forward, and you suddenly fall forward. You cansadh ;2i 0eap et7dv48 imply from this that the bus's

  You are standing in a moving bus, facing fou.oy17wc6rw+b gv (n frward, and you suddenly fall forward 7w.wv6yugf+o 1n cr( bas the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe thekc9ve y5f*fih7: qfe. motion of the object.

  The acceleration of an object is ibz my.e02c *w gjp 3budbw/0n*nversely proportional to

  A net force F accelerates a mass ldbzcvu33q 2b0q(e-y 9cd-o0nr(sgq m with an acceleration a. If the same net force is applied to madqre3z0lsbuv-2 n b3o(g(y 90dqccq-ss 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acce*db)sqwetplj t prjz/-.0 i79 leration results if a net force 2F actstl7ed)jrp z9 ijt.*0 qwbsp/- on mass 4m?

  If you blow up a balloon, and then release it, the gvf* f6lskt rd 3sj.2u29q tu*balloon will fly away. This is an illustra*uvfu32q g2s9kfjd.tl* rt s6tion of

  Two cars collide head-on. At every moment duringpkn2,-(ii c*h9rx pf u the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the firsxcnf2iru,-(p*9i h p kt. This is an example of

  If you exert a force F on an object, tha-*yy r u-rxg9e force which the object exerts on you wilyg-r-r*y9 uax l

  Action-reaction force;55 j 4o77hfu(ti enq5nmunrqs

  Action-reaction forces/+mr66nrmvx5n;q ey v are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage b-dx- qv0c0sqto the car. Since a lot of damage is done on thb00-dq x c-vqse car

  An object of mass m sits on a flat table. The Earth pulls on this onfi jck7,;jsv83d3 kd bject with force mg, which we will call the action force. 7 njvc83kd jd ,s3ik;f What is the reaction force?

  A child's toy is suspended li5mp5 qi,k4wfrom 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 forq45 wmip k,5ilce," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forc8yq.r4i hlv2j k 6vqh2lj6le,e. The ball hits the bat with an instantaneous force, whose magnitude iq q,2jv h6jh8lr2i6 el.v kyl4s

State Newton's three lp: obt ty vd6x3l9*h5qaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon thanrral9 v5c5y,k *d:7uzfraq g19 7vb ba on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared d5 51y v:gab,caqr9k *7l9b7zrv ur afto Earth?

  An example of a forcey -8tl-s* c-ih-xlqhv5a 3/z/szto sv which acts at a distance is

  Who has a greater weight to mass ratio, a person wek 3ylfowy +i8+ndeq(t u07 dw(ighing 400 N or a person weighing 0wit(u y d 7nl+fo+e38qy(wdk600 N?

  A stone is thrown straight up. At the top rtq 8;zr8:q rhof its path, the net force acting on it iqrr8h8t ; r:zqs

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the skf1,; sditcn9 ame height. Ignore air resistance. Compare their acceleratio1tfk;d c,9n sins.

  A brick and a feather fall to tu3.igwp;:fv1 ) wk+/t gitjht he earth at their respective terminal velocities. Which object experui+:v)if g tpt h.3kgw;j t/1wiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elev3+0lot1lkn sb ator. The0 3lstl+obk 1n elevator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from 3403-sga nvptz5 wvqpthe ceiling of an elevator. The elevator is moving upward, but slowing down. What is3 0gp3wz5q nt4- apvvs the tension in the string?

  The force that keeps you from sliding on ub2u s;ic 4xo 9 z.:japr;x.dran icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to9 bh7/oe 1d4iadp -w1x yijzs1 keep pushing it with constant velocity, becau-a 1jeb9p 7dw/h1dozy4x 1 iisse

  A horizontal force accelerates a box from rest acrosxun gon f)7:5rs a horizontal surface (friction is present) at a constant rate. Th5no :rn)g f7uxe experiment is 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 inclint okn9)5lyqj0 o-ug- yed ramp at constant velocity. Thus we can ded5 -- jolgtonuqy)9ky0 uce that

  A block of mass M slides down a frictionless plane inclined at an angle+o j3f)nwt (64 myflwl q with the horizontal. The normal reaction force exerted by the f)yj+owl(t3l 4n6wmf plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle r2 4s+k)rwnyyvl:g-tq with the horizontal. The normal reaction forcr-)tnyk2 +g: vry4ws le exerted by the plane on the block is directed

  A block of mass M slides down . fm y6d9lvv7uoseu94 a frictionless plane inclined at an angle q with the horizontal. The gravi7e4ulf6dvv o99s.yum tational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined planjks3 rh iw(2v8e that makes an angle i3j h v(s2kw8rof 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 appl7t0bl 5o:zws5il(22 s dozdmf ied to the object, and itdo2w55 z2il s(dtb:om 0ls7 fz accelerates 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 sk.mti0 (lk vit+ ;bg/y. What is the averby tv;t mk.g0iil+k/(age forward force on the car?

  Starting from rest, a 4.0-kg body reaches a rol9j p91w0c(om3 perspeed of 8.0 m/s in 2.0 s. What is th p0jel3om91(rw copr9e net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a .gz1ase 9d-g7 6x qgtospeed of 50.0 m/s afterxt16sz -egqag.9do 7 g 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 iv -9sa0q6ree 4n36nshb0w rfyou push a 10-kg mass from reswn0 6r 9he-3 s v0enirb6sfaq4t,

  What is the mass of a person who weighs 1+-u( ffws)os p10 lb?

  What is the mass of an object that weighs 2t8tk*(. yaxa)b xozj3f;h+fm 50 N on the surface of the Earth where theztyfxh *b )3ja(atfo;8 +mx .k acceleration 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 e;*g1duaunp ,n *cm y:on the surface of the Moon where the acceleratio*g1na *p: u;uecy ,nmdn due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth*:(a d. 3vbxchl8txdu , and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of *:hl b datd8cuxx.v(3Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pullisv+uj52ts i .r- 3drpkng on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceler+5sd-s2t kiuvrr 3 .jpates toward Sue at $2.0 \; m/s^2$?

  A stack of books restl/ a1iitjf n0(s on a level frictionless surface. A force F acts on the stack, (l fia/0jni1 tand it accelerates 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 sta7dcv2kn-i n-fqat 5( jnds on a scale in an elevator. What will the scale be reading whedv k5jn7 atinqc-f-(2n the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. Ifq62vp +r .vjgiq e95s. -n)zfxathoq2 the mass of the person is 60.0 kg and the g vp 5.oa6qtx2-sf. nerhzji v9+qq) 2elevator accelerates downward 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 thez ptmqpvd xn;n)4,g3 xuyb6:4 mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration of t3nx64y4nx)pg qpb; dmvzu : ,$4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a magnitude tczn92n 2dcuv5yvo //q3dtv(of 8.0 N and is directed due north. The second force toward the ea 2 23u/cvytc n/(9ovd 5dntqzvst has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatqu3r9vr-c,,ov zp tg,bed of a truck. It is held in place by metal bracke pucq,t9,-3r vz gr,ovts 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 cab?

  An object of mass 6000 kg rests on the flatbed of a truck. 7/x jg0*yux fe It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the trucyexgx07*ju f /k 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 kg, what isc(ek 28gjr fjsf4n(8n*.bp v z the magnitudng*e(8s z8 k4cj. v(jrpfb nf2e 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 tsws 9:fm2w5 sw 0t0mg1wj*oi.( aehyand m = 0.40 kg, what is th0 wts.ywt9o gw0ij:(a mwssf*12m he5 e tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on ahk-ob -d3 ,lhg smooth horizontal floor with a force of 100 N in a direction--ok d3gh h,lb 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 smoothbr ofyd-m 9hx+2uq2rydqk: n436d0rm 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 n 2rhx4u mkqfqyd:-b2m3 9 d6r+ryo0d40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported bycofey+ 6vk ;)uxuwp+.:b( bcd two ropes as shown in Fig. 4-2. What are the tensioxwc;v e cpbub+y.(k6:o) duf+ns in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of1q ahyb ;q(0kh the traffic lb qka (;0hqyh1ight?

  Two boxes of masses m and 2m are in contact 9vkqw:p)p -.b+sugsi with each other on a frictionless surface. (Seebg:+vu9 .sp) qw i-psk Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictio1*q,jz an /azdnless surface. (See Fig. 4-3.) What is the net for1zj*, zqdnaa/ ce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope.5x12*sz trfuh (See Fig. 4-4.) If the forward force on the uxz*r1f s25ht more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a ro*c0y coo; rzp9pe. (See Fig. 4-4.) If the forward cp0r*9c;z yoo 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 ajop9c.m 3t vh2v +h3gw+ewlq .s shown in Fig. 4-5. Box I ov +jqwhmgc3 2 thvl93p+.e w.of 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 : 58+devi3msw uhr,aekinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. ,8amhuesv i35:ewd +rWhat 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 plastic on wood ar6x+e8z0 54d doddgoh3; k,rdn zhw*b ve 0.50 and+ nod bov;dz*d5dr8kdxzgw6,0 4h h3e 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 level surface in the +x directionl3fh(975f:nil mk .rfqi+ kuy. It slows and comes to a stop with anm kk 5ul79+3:rhq y ff.ii(fl 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 hori1u ru; 6x a0)bqlwhm3 jm7hmu(zontal surface is pulled by a 5.0-N force. A 3.0-N friction force retard0wr7l bqjm; (3h)x16mm hauuu s the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, t- ceb v1jgf4*0ml,fw 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 1 2d-x,fo6qwr 26qz45b+kdeezk hc eo,0 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction bek2 6 cdz4 ,kb+ q6zr,q5d2e-oofwhexetween the puck and the ice?

  During the investigation of a traffic accident, police find skid marks tn; amy(*y t:cg frj*: tj+0.f ceduw690.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimatfc*wj: *j tu+da: m.t;ne yf(tc6g0yre the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacke)/ ial .dr4 kz,ksmi3 .m8z6n hlxxbf)d. (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 hl4a/s3)z6i fkl,8imx).. rkbxz nmdslide 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. (See Fig. 4-6.)qx :mz6 6rv3s9es iu:.z ges:d The surface between the more massive box and the horizontal surface is smooth and the :rzi:ee mxq3s9s:6su.vz d 6gsurface 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 frictionless inclined plane. The plane is inclined at ;y0,5(b-oi8um ky *wlpt0c6zsd sqru an angle of-r , u0(*tkbssi6wc85qpuoyzl;y d 0m $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hit ) pv4aptz-7bll 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 icb9e8ge3; vi gg alh4ymd(s/1 nclined 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 smoog50p kg94ubhpx 2.st hth 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 direcacgugcj;ys3y; t/ ys.cs7 (d9tly down an inclined plane, at a constant velocity of 6.0 m/yyc. s;3ca7t9dgygu(; /c sj ss.
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 ro, xn o7l:atb5k+j/ ptxugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slidesn2x efe8*b 0jvgu0 5xb)du8 kn 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. The cablep )h)e(i) eldt attached to the log makes an)e)pdl h(it e) 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 inclined pla(g)rz p)cv l2cl: k.kd5e7 .z j rrq(cx5ek+qbne tilted at an anglee 5q5 gv.rzj .( cc(:pz)r72krc+ qllkbdxe)k 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 i4,ku1lm okg cb*( 406o dbfptzncline is gradually increased until the object begins to slide. The angle at which this occurs is q. Wh4lum(4kg0c1of *bkdz,po 6 b tat is the coefficient of static friction between the object and the plane?