Which of Newton's laws best explains why motornulz gc1 ne,5pi(8x j/ists should buckle-up?

  When you sit on a chair, the ;fnr8s1:a l7apk ) du /uciq5hresultant force on you is

  In the absence of an external force, a moving s hiwvl/g12uk kl06,vobject will

  When the rocket engines on the starship NO-PAIN-NOws*,* /2-dwaue6xhzu +pwn 6nbd,obk-GAIN are suddenly turned off, while traveling in empty space, the starship wid 6snwoexn,/zbu,*-h+ 6* 2kpbaw u dwll

  A rocket moves through empty space in a straight line with constant speed. It cg9l ;pk.6.zvq3ze(kqjrd uwn:0.pr is far from the. qzd(vu;lkzg0 pp:qerk3cr n9..6jw gravitational effect of any 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 bu5u5fvvh*p h 4oqleh 4svg;-hn 9pp2 n3s, facing forward, and you suddenly fall forward. You can imply f4go p*h4pvfnl3hn5-s 5;hq 2u9pev vh rom this that the bus's

  You are standing in a moving bu:h .3g+ yc qqe-ukrqe1s, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What f3eu h q:cy1eqgq-r+. korce caused you to fall forward?

  A constant net force acts on an object. Describe the motion sd0 o-mvdaa90 of the object.

  The acceleration of an object is inversely proportion5lep0/lk.l9bcku2 b l fq(4kjal to

  A net force F accelerates a mass m with an accelerationnraaxe x6-so/o o(/l6 +k 1mwwu(3ek t a. If the same net force i((now/k a/6e1ar6t o+mx-l3uo kxwse s applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m an xj:*;g8qgsmln cck+ ;d produces an acceleration a. What acceleration results if a net fms;:;q*c+ jgcxg8nl k orce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly f-lrvmv og.a m fd/2p66 6mhf,away. This is6hm2,lvv g 6d ff m.o-fa6m/pr an illustration of

  Two cars collide head-on. At every moag)0p5 ny1 +r 3-.pemf l ou-rer ylem.-hul9gment during the collision, the magnitude of the force the first car exerts on the second is exa egeylm3)- . 5r9l f1o+-r.-u0pygrmnplueahctly equal to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force lnza *-, odh, 4kpjta1F on an object, the force which the object exerts on you willat,n- *a k1 4opj,dhzl

  Action-reaction forcexh +t;z)g/dp8xf9- e;fhi c3z jif+ips

  Action-reaction forces arexs.ae m ka* ;-g7e nerkvf66b/nwk )2x

  A 20-ton truck collides with a 1500-lb car a7rd: kk:kfifr9a x4hd +p4k s.nd causes a lot of damage to the car. Since a lkk7dx4 a4fk+ :h s9k:rf.pidrot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this obj+j-odeyuw+8h*.2, v vxe f aukect with force mg, which we will call thev jd- e ye8o2*ux+a+hu.wvk ,f action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The sj0b c u0,3aktEarth pulls downward on the toy with its weight force of 8.0 N. If this is,jb0 ac0 ust3k the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. ,3,lqrdhbgs. 2 3jsgi The ball hits the bat with an instantaneous force, whh bqdgl, ,.jg3si3 sr2ose magnitude is

State Newton's three lvsv (mmko mu/8w6jo/ 5aws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Whichsggf5b1xawo0y5.ouifp 2fsy l 53+x4 of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eart gw4b+5figoup2o15 ysf 0.x a3yfsl5xh?

  An example of a force which acts at /(ced8n uohc vp(4l2ha distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a pens2d jiz4 4uc oqe-3g5rson weighing 600 q5id 2ugso 44znj-c3e N?

  A stone is thrown straight up. At the top of its path, the net force actin2b jo+ /v.vzop 4ksta0g on it t 4o b+ozpkvv02a /js.is

  A 20-N weight and a 5.0-N weight are dropped simrcnu76f2 pzw.g l1eaq)q9( hk ultaneously from the same height. Ignore air resistance. Comparl)(ek 2cwgqpfa h91rqu.7 nz6e their accelerations.

  A brick and a feather fall to the earth at their respective terminal ve,v bm6fm.zx.+htfr: c locities. Which object experience,r f.+zb.hcm tm6xf: vs the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevatova sa0*hf9/rtr. The elevator is moving up at constant speed. What is the tension iv/r*h0 aat9fsn the string?

  An object of mass m is hanging by a string from the ceiling of anl*r zzdcw( 0o l6xa6rffv6r 2nzmm0- )g,o q)z elevator. The elevator is moving upwar, qlz )0rfx6lzmm fog -z6nv)docwaz6(2*r0 rd, but slowing down. What is the tension in the string?

  The force that keeps you from sli,8733fvx /p uwwofuezding on an icy sidewalk is

  It's more difficult to start moving a hsh a3 y2hviw+1eavy carton from rest than it is to keep pushing it with constant velocity, ihhw3sv21+y a because

  A horizontal force accelerates a box from rest across a horizontal surface (, yip-t j8. 0xokqtp+gfriction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with tyjo-.xq t8ki p0,+gpthe exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclinetkb q6 p rak.d.+f14uzd ramp at constant velocity. Thus we can deduc.+k6u4t z 1akrdqpb f.e that

  A block of mass M slides down a frictionless plane incliz0s8jarc1ue:w 2lh )n g) ayv7ned at an angle q with the horizontal. The normal reacti1e 2jay)0 g: avn urcw)hs8lz7on force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q -v zy2+ jf statw lq7x4md9-/zwith the l2x/9zzfv4dswyt+tj -a q m7-horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a won pdx-8,f 7mfrictionless plane inclined at an angle q with the horizom 87ponw,d fx-ntal. The gravitational force is directed

  Two toy cars (16 kg and ch- y1z-962d1x hluyz- onr9b*eykhk 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration aflz1y ch9 r*h2kdxyku9 bzo- ye-n6h1-ter being released.

  An object sits on a frictionless surface. A 16-N force is applied to t 45 o*q6i a5oh;mow v+dctk8bdhe object, and it accchmtoaoi5 8d *5+wo4vbqd ;6k elerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10)l.v rlze 81ss00 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forwa8 sve.rll1s z)rd force on the car?

  Starting from rest, a 4.0-kg body reaches a spe5)-mg,v j0s2rj9feojt +ucd yed of 8.0 m/s in 2.0 s. What is the net fo )90fsjv 5gycud j2jm-oe,tr+ rce acting on the body?

  An antitank weapon fires a 3.00-kg rocket who /:q 7c* eff iznkueg g81cr5-defgjr61h4l( ich acquires a speed of 50.0 m/s after traveling/7 o(ehi:jfdfr 56-f* kzn c gg1qe1rl4ceu8g
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 sa8i /2wrg;n-bc5 /mru uzat+ch(a f)zbme force that you push a 10-kg mass from restgh8c ;a/b r 2a cuft)nbz(rzuw/i-5m+,

  What is the mass of a person who weighs 110 ldrz.9b:7 m l+xkd+vwl 0mm8ucb?

  What is the mass of an obs:+ nlcf(yian,0x107m ek ,af :vuns vject that weighs 250 N on the surface of the Earth where the acceleration duyx (na1+cmfe: :sn0 uka,nvfsiv 7,0le to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of th 0lhw)rlc /1kde object on the surface of the Moon where the acceleration due to gravity1r)lwd0hcl k/ is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and9:gs: evx+ ucs:y4h5 qisms:j object B weighs 40 N on the Moon. The Moon's gravity is one s yegvh59j:isuq sc:xsm:: 4+sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opplb nwodcq 44-mlvq3,oh9jb1 h61pz /aosite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward h39n mdjplho- v 4qo/az14qw 1,c lbb6Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F act k1. zd14 a:jfwximtp6:jyl8ss on the stack, and mayf1 :s6 jx i.4z:8jtlwpd1kit 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 a scale in an elevator. What will the scxt.i yn-ac71e ale be reading xa7n1 eyc .ti-when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. Ihyb b8qc m,3/nf the mass of the person is 60.0 kg and the elevator accelerates downward witn,bqbm3 /c8yhh an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. aq05cti5rdb31 m ro3pIf the mass of the person is 60.0 kg and the elevator accr30qmrdp1acib o 5 t35elerates 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 a magnitude :u;w h9* lp:c gct0obsof 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0c sl *9huw:tc pbg;o:0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. lk 1a7g::k ck5xjk r,rIt is held in place by metal brackets that can exert a maximum horizontal force of 9000 N5kkkxj k ,7rrc l:ag:1. 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. It is held 9gn5x,h6i) k3 gtrzgq 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 slirt9zqkg6 5h,g3 ) ngixde forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is kn* l9e8bjbquh4yi39o6 ifm9 the magnitude of the acceleration of the system? (Ignore friction and the mass of the pully*u9 fi o98b49jm q h3nikle6bey.)

  In the Atwood machine shown in Fi7twv+ l+/4i pytp5hprg. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore/plw+5r +p4tv7 ityp h friction and the mass of the pulley.)

  A student pulls a box of books oq x9 y.o cfot50dgp.7wn a smooth horizontal floor with a force of 100 N in a dfxytop0 . 5qo79g.c wdirection 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 foso2 c(rc 67riw5h ye;k/ e9zj49 iuxfxrce of 100 N in a dix z/y9j79uc w5i2 s6reeokcrh(x ;if4 rection of 37.0e above the horizontal. 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 shown in Fig. 4hs..a.sm 23u1heykzq -2. What are the tensions inu.yhs .hm.z2s eq3ka 1 the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of -dn qyru,5ly*fep8nct; p5 .l the traf* yyq5ul-e5 dtppr ,8lc;nfn.fic light?

  Two boxes of masses m and 2m are in contact with each other o8 h68p gq+unmln a frictionless surface. (See Fig. 4-3.) W8hgn86um q +lphat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless.:h.v8vfof bp) y54x hgca y*u surface. (See Fig. 4-3cb.yo 8p uax4*fh.:) 5vvy fhg.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are cwzjd t )zh.www6d j8(6jj .a h(;1gljxonnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is thjxjwj6w.d.tl(j(zda61 ;h j z)g 8w whe tension in the connecting rope?

  Two boxes of masses m and 2m are connected :fzo; 54 oshko z oerrnda3b(:js)3g(by a rope. (See Fig. 4-4.) If the forward force on the)oj;zor dkfz r4onob:ahe ss(g3(:3 5 more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over :vn unzk g,*(fa pulley as shown in Fig. 4-5. Box I of nz k gfun(:v,*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 s75 jai uto47q vkl:qa/tatic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to t 5 a ja4koiu:qt7/qlv7he box?

  The coefficients of static and kinetic frictions fo9 ao8jqq+uhz) gh2us ctu64z: r plastic on wood are 0.50 and 0.4qc9qh tougua68h)sj zz:2u4+ 0,
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 t 12 ukk-a0ia(nqkqy 1phe +x direction. It slows and comes to a st ukn1ai2- kqk(yp0 1aqop with a 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 horizontal surface is keyczi2t 2n 8;pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the n2ie cky2z ;8tobject?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, 2bpmk kr f(/9tat 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 a.*m8qgr7j),, 0v lvexii rdq9vkda8d n initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck arxv7vrdkeav g89 q)q. ld8*0,md,iijnd the ice?

  During the investigation of a traffic acca3f/rvg;c82h5m x 3 eb0s nnizident, 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 for the prevailing conditions. Estimate the speed of the car when the brakes w8bm;/efza3 ix2rnn5 0 c3 shgvere applied.

  Two boxes of masses m and 3m are st0isbwoql/;- 0p0ri5o ogust ag+cl;)acked. (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 mapt/-l;w) roig bi0 gl0;0 ouoa+ sc5sqssive 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 surface betwee/mhabv,1wflo n (2k b*n 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/* ohv(1w,2mbnalkbf the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a fricti o1hymx)i vx)*sdd8 ;ionless inclined plane. The plane is inclined at an angle osx)18y di*x;ohiv ) mdf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle+(upyej(2b ,ktfes0 r 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 ani xat e*3cl2:c0uxu :e 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 k6fscn1fi/m )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 directly down an inclined plane, at a con0f4dk6x1jmpw npe i5y,p 4q4x stant velocity of 6.0pwf5dj ,1p4pxe 4qn 6mixk0y4 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 down a rougmm(nli9bgqi k0jt).5 wdd q26h $37^{\circ}$ 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 i 2-v(qmo(rnnrough $37^{\circ}$ 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 suvzrcwx;62b fcl/-f 7grface. The cable attached to the log makes an angle fv;cgzfrxw l-7/ c6b2 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 frowvq14 guyff+ ,m rest on a rough inclined plane tilted at an angle wug+ qy1 fv4f,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 incline is gradually incig51qo 9 ua ko2/i;ogfreased until the object begins to slide. Theo95f1 a 2; iiu/koggqo angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?