Which of Newton's laws best w5yj5ee74zs:1x* q km dy7xpdexplains why motorists should buckle-up?

  When you sit on a chair, the resh 7bhic2aq+,i ultant force on you is

  In the absence of an external force, a movinguc(z.q/, f8vduwfv41p)1 p w+rhyd ma object will

  When the rocket engines on the star,rupn vjox/ g0a5 )ip8a 9-gpfship NO-PAIN-NO-GAIN are suddenly turned off, while o,a5 9-uj)gpnp/ gvpx8i r0aftraveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. ): c4+rc3uwz r:djypn It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocur): jyccpr3w:z4nd +ket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forward s5twy8x:m.;.ekr.2 vnk qatq. You can imply from this that ttes.x.tq5 .qwy:rv ;k2an8 m khe bus's

  You are standing in a moving bus, facing forward,jmhw3k0gae nb/)y.6 h*5x qtb and you suddenly fall forward as the bus comes to an immediate stop. What force cay. q36/eg5hhnab*m kjxt)w0b used you to fall forward?

  A constant net force acts on an object. b22x m,b4 fmvg Describe the motion of the object.

  The acceleration of an object is+lmq5 oj2e8)zyhc te2 inversely proportional to

  A net force F accelerates a mass m with an acceleration0 lutb ;kww(b *ivp+e( a. If the same net force is applied to mass 2eb;u0pl +( (bivwkwt* m, then the acceleration will be

  A net force F acts on a mass gm0g l5v+7a6gva:c catzrd 8*m and produces an acceleration a. What acceleration results if a net force 2F actsg6vlgc 5+0vr*tz 87 cmdaga:a on mass 4m?

  If you blow up a balloon, and then release it, the balloon wiepsswm1:j df *kv1-lwqx(1 b1ll fly away. This i(ksew* p s1qf1 1v:1-mx ljbwds an illustration of

  Two cars collide head-on. At every moment during the collision, the magnim-p k7spxf( a oj:j55gtude of the force the first car exerts on the second is exactly equal to the magnitude k: 5xp g- oj5j7asp(fmof 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 oyjqwx4 p61xe)f2 lv4cn you wixew6p1 fqlv24x j4 yc)ll

  Action-reaction forcesv t dri1xb*y.0

  Action-reaction forc1l w *y.ak-pvies are

  A 20-ton truck collides withz3v.o:-mcb jt6dd, lz a 1500-lb car and causes a lot of damage to the car. Since a lot of .v, :m6d b3dztl zc-jodamage is done on the car

  An object of mass m sits on a flamv9y0*pz5x 9( -saz 4ycm dpyzt table. The Earth pulls on this object with force mg, which we will cpzza4(59py0dyxmvzc-*y9 s m all the action force. What is the reaction force?

  A child's toy is suspended from the ce;f1i:z zt tal e*tu29ziling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is th:tz; az*12ztfulti9 e e "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you witmxv4dk yl4zg)nlb+d m op4fr6exb0 0l807u-th a 1500-N instantaneous force. The ball hits the ba8bop x 7l4g 404y0 lub06n+)vrdm x-edmkfltzt with an instantaneous force, whose magnitude is

State Newton's three law.r*zu4a t1raj a2 9vypoy, aexxxd;*7 s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Ewumi6h,b (-ejarth. Which of the following is true about the mass and weight of an astro-m ib (6wh,uejnaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distx4 *o1ch2x pcgv( mc0bance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a persp+wm+ch (95dqa0i) fim 5mjaeon weighing 600 5( cd5wap iqi a)mmem++0h9fjN?

  A stone is thrown straight up. At the top of its path, the net force acting wog5ht/xga .0on it isa x5ho ggw./0t

  A 20-N weight and a 5.0-N weightwyl5i:wtu :qitf(ypi,14c+ t are dropped simultaneously from the same height. uyw(,:c4fiw1il :+5 qpt iyt tIgnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earthw-;5wcag; w w7+rxq8pg k1lo f at their respective terminal velocities. Which object experiences the greatergkq p fl;c+r;w8wxwa75w o1g- force of air friction?

  An object of mass m is hanging by3it;y65bbt qvtxvv)w.h wx8 + a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the t )iq;x b3 v5+bywvwt.v6h8t xtension in the string?

  An object of mass m is hanging by a string from the ceiling of aydd2t u2 *uw;vn elevator. The elevator is moving upward, but slowing u; *td2uwy2vddown. What is the tension in the string?

  The force that keeps you from sliding okz wubr (;vq lg:85wq/n an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to ke tqh v,/(g, u/ca8+w wqqnd vrpqo0n g1-/lu2mep pushing it with constant velocity,wva+2uqro m0l (,u-g,pvtdgw8 /nqq/n qh/ c1 because

  A horizontal force accelerates a box from rest across a horizontal surface (f+io sjkeb98k i(5e 4znyk3 yu3riction 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. kkb 5jky3ezy4u(9 s8oei +in3 What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus werm;lftr h q- ,s,v9ubx9suc/) can deduxsv9f,luh/ c ;s rq mbr,u-)t9ce that

  A block of mass M slides dy2 o 01,blkxzb 7hvd)gown a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by1gzk7hxo2 b0v) yldb, the plane on the block is

  A block of mass M slides down a fricti*g (;huzi0x iof uub65onless plane inclined at an angle q with the horizontal. The normal reaction force exert;5h uizbiux(o6g*f u0ed by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclin uy2ro:+7gt 2k kfml1ted at an angle q with the horizontal. The gravitational fo+72k1 l2mttogkufr : yrce is directed

  Two toy cars (16 kg and 2.0 kg) are released simo)x3sdb edpe )uom+/ 0d(c3pv ultaneously on an inclined plane that makes an angle of 30e b( )om3cpv u30do ex)ds+ ed/pwith the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N forc8 e.1luszorl *e/ek 8me is applied to the object, az.1sle8l r*eem8o / uknd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerahg47x,; vsxbgte from rest to 27 m/s in 7.0 s. What is the average forward force on the ch,gs4g7x bv; xar?

  Starting from rest, a 43tk04 xmw qy/pfy;/ )kcqfgg1.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on thetg/fkfp/cmwq 1)yqgy43k; x0 body?

  An antitank weapon fires 7eahka/e( to,a 3.00-kg rocket which acquires a speed of 50.0 m/s after travelit (eh/,aoe 7kang
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 ma wjd3l.32 xrfass with the same force that you push a 10-kg mass from re23jaw.fd 3lxrst,

  What is the mass of a person who weighs 110 lb?pgo ry v1vbw7q5/xd9: x9 0gnb

  What is the mass of an object that n;;w)tn5fq kpnl61/cch ldsfb -l/ 7mweighs 250 N on the surface of the Earth where the acceleration due to gravity /wf;lmsf /ph 1 6 tknnqccd7l5n);bl-is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth..4hj(jjxy.k hnab4v ; What is the mass of the object on the su;b. 44 j.xhnvjj (khayrface 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. Thesnez l6y)q*a:df, yxeu57;lkd;je ybp * ;n3e Moon's gravity is one sixth of Earth's. Compare the masses5 j z7,)y*3ba;xn;e eufel:dpk*y6 dnsyq ; el of the objects.

  Sue and Sean are havinwq1qd8.sv/m3u;g nx lnx-by *g a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sedq/*3 .yu;xqngsxvwlb 1n8 -man's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests ja ;o4 6nlope4(k:nfuon a level frictionless surface. A force F acts on the staon; ek 4plu4aon( j:f6ck, 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 stan v/ybly(gk4g *bac 58uds on a scale in an elevator. What will the scale be reading when the elevatocbb a*ygyk84gul 5/(v r is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rid6 l;4wgoqg ywemh;ne p,+h8* des in an elevator. If the mass of the person is 60.0 kg and the elevator accelerate4wy qe,+m n g8hpdwloe; gh6*;s 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 ele,5a yjkt,f8wl vator. If the mass of the person is 60.0 kg and the elevator accelerates,ja8ly5,f wk t 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 maaw(5jp09 i uh ny/vo/t:u e,owss. 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. :(u5w ynwpiv/ou ajh9,t0 /eo0 N. What is the acceleration of the mass?

  An object of mass 6000 kg uuq ),:xva2oynl.c + fskg/- jrests on the flatbed of a truck. It is held in place by metal brackets that co) q/ .fs c+:anvul,j -2kxyugan 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 jqzrtq 1.o)f r:gy1(q 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 is not to slijr( q 1y):zqo.q1gtfrde forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 02c vo:s,8fwe3* vuao x.60 kg and m = 0.40 kg, what is the magnitude of the acceleration ofx *:o a fwes,vo83cu2v 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 =1 zwb9w:i9 quk 0.40 kg, what is the tension in the string? (Ignore friction and the mass of9:1qi u bkwz9w the pulley.)

  A student pulls a box of books on(wnr/.57c/lxiwd o nj ejj.( y a smooth horizontal floor with a force of 100 N in a directiowril.( wo (n/ d/xj jjc7ne.y5n 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 booat m )dig-,jrtl03y- x of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizo,j t -03dymlrio g-ta)ntal. 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 by two ropes as e /2lmjd+hmo b f,2r(3iyb sa7shown in Fig. 4-2. What are the tensions in thehrse/b,m y 3+2d2imb 7fo(ajl ropes?

  In Fig. 4-2, if the tensions in t9 n -;ijqdv)n htqcmrn:u* .7dhe ropes are 50 N, what is the mass of the traffic -cqj9 tr ud)n; i 7hmqn*d:vn.light?

  Two boxes of masses m and 2m are in contact with eac x7u*s5ya-)l6)j jweycno; rzh other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bojr )7n )xse5-aj ozw;yc*y6ulx?

  Two boxes of masses m and 2m are in contact with each other on a frictionless3;aqf70tsnz s7k xa*fa6nrf - surface. (See Fig. 4-3.) Wha 3sf7a- *;ftnqknx07a 6f aszrt is the net force on the more massive box?

  Two boxes of masses m and 2m are connected e;jao +uj2,k9c+e zgdby a rope. (See Fig. 4-4.) If the forward force on aue ejj9dzc;g2,++ok the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a a-9uirxop++h rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massah +pu +o9-rxiive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. Bqcya,mfdgmi 7 ,3q+ +uox ai+my,+ mfdcqgqu7 3 ,I 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 kineticy hq/2fafp q, hn-o*- 8l2izwb frictions between a 3.0-kg box and a desk are 0.40 and 0.30, o-2i,y8 zhfaq/bfwlhn qp2 *- respectively. 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 plastic on wood ary5hp vss+ i1e+e 0.50 andeh5s 1p+vsi y+ 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 direction n1 2)7xiz9t ehik/0fb hc0bpv. It slows and comes to a stop with a constant ac7net9bcfx/z hh0ivi pb0k)12 celeration 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 horizont4-kea x.khjvn et0q))od7xw6 al surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is tq4avk) k.n0h w-x d7jx6o) teehe acceleration of the object?

  A horizontal force of 5.0 Nw)i vs aghlk *j;9b1f/ accelerates 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 10kn;y1 vhvz:ian l gx *,ipy*1/ m/s. It slides 50 m on thi nayh1n 1x zvp/k; i*:yl,gv*e ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic ac2 + u rwibocexvtq44: em06eg4cident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 forx6+4wc qv24 bgo4 me:e eirut0 the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacke w;.4ckg3 s (xgjh:bxi+4 5hzbo3zqand. (See Fig. 4-6.) The surface between the more massive box and the horizontal surf4; 4aw+cnizk hxh33:q(bx gz s g.jb5oace 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 mdojws)7ih3(h :34y-r hqmfex and 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 masmi - ew3xh3 r(hs7h :d4f)yjqosive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. T 3npk:biy ri:(he plane is inclined at an angle of 3 b i:nrip:k(y$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dowz yvty8t)8j 3xn a flat hill 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 witfkg/ e+g af v,vqxb/;5h 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 inclined plane tilted at an angle 8tr3u 8k+ups,sz/ hc vof $35^{\circ}$ 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 an inclined plane, at a constant velocit,f be*gmn(wg2zhek( 1y of 6. fe1k(b g*mnhz weg,2(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 slumdi8e4+geg:7/w (v-5q z 6lzrmsdxkides 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 slideso.p onj 6g) d)erp9-io 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. qf0wu*vhc*i 7e0 kk(eThe cable attached to the log makes an angl uekhf0q(v*w*ec 7k0i e 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 plar rc hxq9u4f.+y1z )bane tilted at an angle of fhc ra1bx.uz y49+q)r$33.5^{\circ}$ 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 incline is gradually itq4xom :tg/3a: 7e:7wphrcyt ncreased until the object begins to slide. a/ht43p:ecmyx7gt t wroq:7: The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?