Which of Newton's laws best explain. q8vh7nnz4rj s why motorists should buckle-up?

  When you sit on a chair, the resulfmv*r0+ dx0zx(- l vvhtant force on you is

  In the absence of an external force, qud)itc;5q+ ujx+h-9av v0cz; bkyp7by,s g 3a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are su;bx:8qk z w5etddenly turned off, while trawzx:be5 ;k8tq veling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant sps, ux8 a2g4ve4n7,gg4kqp9 z p7v afboeed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must beqgpa47 4og4e,zf psbv7,2 uxa8k9vng applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly f4 dg;apzdoeq .,)2 fjvyk;qw:x5* guaall forward. You can imply fde poxwz2kqj;u ;y gdg* : f5a).,avq4rom this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall xp +c+2acm2q3 gb(r 1qf90srmr0 fbroforward as the bus comes to an immediate stop. What force caused you to1(gm +00q ora2 +pb3 frbcfrxmqcr9s2 fall forward?

  A constant net force aq cir *fr-;xe ku9ji(f.o7fw1cts on an object. Describe the motion of the object.

  The acceleration of an object is inversely 2+ot-lvu4 shj fcsm 2+proportional to

  A net force F accelerates a mass m with an acceleration a. If the sajonc, b51 **uowz ybo.me net force is applied to mass 2m, then the acceleraywo5uoj*bcz 1n *.,obtion will be

  A net force F acts on a mass m and produces an acceleration a. What accele k aw)ezdeq9;;ration results if a;)dzewa ;9qke net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon w v6r r oq.xh:rxhz6z-+ill fly away. This is a+rq6xz6. r x- rvh:ohzn illustration of

  Two cars collide head-on. At every moment during .hzj,/ez p sh5the collision, the magnitude of the force the first car exerts on the second is zsz j. h5ehp,/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 object exerts on ygm- xz(nqn (p/5j-njiou wijxq --mj gn/pnin5z(( ll

  Action-reaction force5 yrcr, q3hqe n4onc0b-uc .l;s

  Action-reaction forces an,z1: :5b f nxnimbqu8re

  A 20-ton truck collides with a 1500-lb car and causes a lot of dama9cvvjtvpefjk) x ;ouym.+ t*-cs6+o 8 ge to the car. Since a lot of dam* tcovue+;f+x j c9yvp)s.m-8j votk 6age is done on the car

  An object of mass m sits *(y+c sng h+zfon a flat table. The Earth pulls on this object with force mg, which we will cf sgnzy+ h*c+(all the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by mg. +wg1e;hj srj0f r.means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this irsjm 1gg .f;jew0h+r.s the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to/rgnykeu zk p3) )zm87 you with a 1500-N instantaneous force. The ball hits the bat with an instn y7 k uz)/rmgpzke83)antaneous force, whose magnitude is

State Newton's three ze-ix -3i zv6i8*7lchpj8zxl ,us q/y laws.

  Mass and weight

  The acceleration due tocvrdi7 d7io tx;dm 1:5 gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight7od x:iv75 ircdd1m;t of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whics 8 hbr*m.vco2h acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a7li)a*xixe.w4 yqv7 (g jfb/q person weighing 600 Nwajq*7ie4 /i7.(lgf )b qyv xx?

  A stone is thrown straight up. At the top of its path, the net force actinf* hl r p4xykb4v: ark 4t/,+ckuevjkr3, f;.vg on it;ktpy3jvku 4r,.:r krff4+/cv,hb el a*4xv k is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the samv9qk(ooe f okp9b0;;ze height. Ignore air resistanc;z9ko(voq;bf9e pko 0e. Compare their accelerations.

  A brick and a feather fall to the earth at s6 dluqx50a(mf 0np;utheir respective terminal velocities. Wha us lfpux0065dnq;(m ich object experiences the greater force of air friction?

  An object of mass m is hanging by a string frjb92pn 5vhv 0hom the ceiling of an elevator. The elevator is moving up at cj0vbh2v 95 nhponstant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevavaaz -5yr m z(r qbm847or;b7stor. The elevator is moving upward, but slowing down. Wha va(b4 yozr;m q8smrrba-75z7t is the tension in the string?

  The force that keeps3a0wg4 jtvo;hl,;.i h rzx6:ntmss:a you from sliding on an icy sidewalk is

  It's more difficult c9b qk za1xrl,:-ef+t to start moving a heavy carton from rest than it is to keep pushing it with constant z-,ctx9l:e b 1 rafq+kvelocity, because

  A horizontal force accelerates a box from rest across a holpi9ro,onl/ l 7 b+yf4l;s sg:rizontal 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+i4 /ogp 9lsr,s;n7of :l blyl is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp atz6kv nej)2j4t constant velocity. Thus we can deduce6j v znjk2)4te that

  A block of mass M slides down a frictionless plane inclined at an angle -+l1 mwspj )laq with the horizontal. The nor+ 1 sw)laljm-pmal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane intw3)-9 sgw +clqyd:zs8 qt4sp clined at an angle q with the horizontal. The normapl qts w)3wzcq4g: t8sd9y+- sl reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frihmk3o /,kqnj zgz(1w0ctionless plane inclined at an angle q with the horizontal. The gra0owjkg/z hmkzn (1q, 3vitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouc-24v,+g2kdbx 8xh hdxrgz ;msly on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their accele2 xk;x 8b dhcmx,-d+2grhg4 zvration after being released.

  An object sits on a frictionless swgiv -u-p 8,zmurface. A 16-N force is applied to the object, and it accelerates p--zv imwu,g8 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 jnkw*/zjs .b,jrx0v ,7.0 s. What is the avvj, xs wjzn.,*k/ j0rberage forward force on the car?

  Starting from rest, a 4.0-kg body reun4. gqs, zua7yti2a:aches a speed of 8.0 m/s in 2.0 s. What is the net force actin2zas, anu q t:.yi4g7ug on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50. prhj.4n3*co:xv*(p /xzkdj r w)q2wd0 m/s after:r2xo zwdvj *rnj) /p3cxq*d.kp(w4h 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 *:o-9a76z,q8 wu uk+tl / hhohdnowll push a 10-kg mass from rest,:qw+t/ a uloh7,lldh6 *hu o-wk8 9ozn

  What is the mass of a perskmh(ax dt kx+f*5.a1zdh q y;*on who weighs 110 lb?

  What is the mass of an object that weighs 250 N on o:ow pbqsm0-,8dln b5the surface of the Earth where the acc:85b-o b qsl,pd mnwo0eleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. Whatuvf(la2p* y;ek3w (ycw l** 6rps kgo9 is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1o 2e*p*f9;wlclg (yup3*ysakw r6kv(/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on thc.l8fgu m *;wx:+d t78eh8jdvkf, alq e Moon. The Moon's gravity is on al u. gw8f,vk t*e+;l:md7xj 8f8hqcde sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg rm rk8;/vkpnbu0z /d ;rope. Sue pulls with a 15-N force.z k;r0bv/udr/8mknp; 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.j re9 8ea6o o5.*5liyybxf2 qb A force F acts on the staay o *eb 52be .lyi9fqjr86ox5ck, and 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 stands on a5hs3fzl56j)gmu wtx7rg 18ya scale in an elevator. What will the scale be reading when the7 l)56rhj gs1xymu5g 8twza3f elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the perso6uu r: (g)* xde+rygxl09rm1a zqqfurg(em.. n is 60.0 kg and the elevator accelerates downward with zrg1yq6 um0aml(+gx. ru . ( *x)eeu:rfr gqd9an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If tl3,q,cn m fbsust,d nc5a3/; the mass of the person is 60.0 kg and the elevator accelerates upward with an acn;a ,b t ,dluq/,c33 cmsnst5fceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a34 c)2c xqig 1l4ekaxj 5.0-kg 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. What 4x4 gkaj3l c ec1qi)x2is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbeu5sgrmy6g yz-ml/(n 7 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 load is nog rn5yyl(7um-/6 msgz t to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place i gm lho/l8t7vk m2wi+)l2 vv6by 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 the cabiokwmml6iv7v+ )/g hl82tl v2 ?

  In the Atwood machine shown in Fig. 4-1, ifueoco3u 8j y04 M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the syuy0 u38c4oe jostem? (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 ccsfrb( w(1z+, what is the tension in the string? (Ignore friction and the mass of the ccfrw+(1( bzs pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force ofh *1;-mfina gzwoa35g 100 N in h zmgfna 3io 1-;w*ga5a 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 horizontal floor with a p,hi v 9o8in+4b/eygtforce of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and t+o gph9e/ibvty8 in 4,he books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is suy(w:( t)ut hfzpported by two ropes as shown in Fig. 4-2. What are the tensions zhy:u((t )tf win the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the traf2ed0t/4ix r iwf/2i4iw0rxe dt ic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sumta7e.6 6s csvrface. (See Fig. 4-3.) What is the accelera.v6ctasm6es 7 tion of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionle,egj lq 3 h oxijhe844aw*13afss surface. (See Figxe4 f*w1oi g8a qhj e34h3,jla. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. xyt1r 3sibx*+4-4.) If the forward force on the more massive box is F, what is the tensitis * b1ry+3xxon in the connecting rope?

  Two boxes of masses m and 2m are connected b/ttdokdd9-f/0:j7(k z qh g5zdig ky-wua/ +f y a rope. (See Fig. 4-4.) If the forward force on the more masgz7:kuf -fq- a5 /h0dijt dtd /gdk9kz(+oy/wsive 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. 456qo: uwyehmezd)*q--j3zn+ka t *hr-5. Box I of m5r3we *dqu jmyq ekn)*h6t:a-+-hzo zass
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 bet. 383wuiljqo oy0:gfc ween a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net forc o 0 qjyicof.u38g:3lwe on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastik u9op8qg ;zxq+qodw .vs1)b3c on wood are 0.50 and 0.40,wsqd1x) bz;uq +o vk8qg9p3 .o
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 lev9i6hto6.hca pci(2zp el surface in the +x direction. It slows and comes to a stop with a constant accelerati.hc9 oht6c zipai6p 2(on 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 forc/ sqi3jycj1*l e. A 3.0-N friction force retards the motion. What is the acceleration of tj31ycj/ lsi q*he object?

  A horizontal force of 5.0 N accelerates a 4.0-kgagfedsckp7n l8qg *o-1e44z / 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/sratxozv.5:7 js,5h-s2uvlzb . It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and theo .-u2rjzl 5bxv5h :zavts7 s, ice?

  During the investigation of a traffic accvxa 6*cw9gfq83quv 1y ident, police find skid marks 90.0 m long. yvxq v1 w6g9fcqu 83a* They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing 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 mvc2c sf593pe2 jlj1vsurface between the more massive box and 5sj e1 vvf2 9lpcjm23cthe 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 massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The +z db /lbgg :da1g i.v u2xzmy73vg2e-surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mz2v.:-mig+x dg g ba 7e3vz bugdyl/12assive 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 inclv m)rt1cvg+n*u4edl: ined plane. The plane is inclined at an angleev*1nlr tu+vm):g d4c of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thar62c4 mwmlb/nt 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 inclm5v +l y;l)v+wh6b+ namr0j tzined 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 inclinj,:fby f.ze;m ed 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 directlyu8glvc: y4q)q down an inclined plane, at a constant velocity of:cq uvlqg)8 4y 6.0 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 mass m slides :bmi3 jjv /qi,a5+njkdown 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 mas97/wz*mdd9 ve) 1m ogaogbl6hs m slides 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 s5 dvmmedh47x:urface. The cable attached to the log 5e47hm :v mdxdmakes 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 rzy hl .96s;gfj,*y )askxqs75fex9wsed from rest on a rough inclined plane tilted at an angle of w*hzqf)l5ysag;s9f9 6ke. rj ys,7xx$33.5^{\circ}$ 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 a8 25adz2j,:od oyrgn. The angle of incline is gradually increased until the object begins to slide. The angle at which yr oj8a,n2z ddg25o: athis occurs is q. What is the coefficient of static friction between the object and the plane?