Which of Newton's laws best explaiq3bdj1www ,q nt+ b /s/d8qd1kns why motorists should buckle-up?

  When you sit on a chair, the3k t 9i5i qv/v7m hyz3m.jk9xx resultant force on you is

  In the absence of anqw83 mgvdry 4(/;9(osorob hg external force, a moving object will

  When the rocket engines on the starship NOdzha48 um:7 dw-PAIN-NO-GAIN are suddenly turned off, while traveling in emptmw hd:8z4 7dauy space, the starship will

  A rocket moves through empty space in a straight line with constat f93gw1-lr;qb ;kvcmnt speed. It is far from the gravitb1;l 9c kf-;w3m rqtvgational 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 moc; -st/eydk9 baz)itp; ,yos4 ving bus, facing forward, and you suddenly fall forward. You can impl-tdt;yzc )sspe ,b;4a9o k yi/y from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwardr5u ; y8+f6)m uu(u(jsuyg mu,)nprfa as the bus comes to an immediate stop. Whatn+;(umm)urf8 aupy yuf u(s u)jg6r ,5 force caused you to fall forward?

  A constant net force acts on an object. Describe the motion ofxrzd 9u:dd7ot ymhqjl8m0/ t980 g-t y the object.

  The acceleration of an object is invejd u nfus*h tarojlx.35-1(9lrsely proportional to

  A net force F accelerates a mass m with an acceleration a. If the 04atpaw0ff/6vcun-/h zq xt ; xh,j;jsame net force is applied to mass 2m, then the acceleration wiuzjt4/ft6a0;wq xhf0-p / v n;ca,hxjll be

  A net force F acts on a mass m r 85y79wi sr7 e 4qvc:v/kpwnuand produces an acceleration a. What acceleration results if a net force 2F acts on mass 4v8kp4 wn ircevus : 7r/q7wy95m?

  If you blow up a balloon, and then release it, the balloon will fly away. /s ohczi3 0+yn This is an illustcsnhiy 30z+o/ration of

  Two cars collide head-on. At every moment during nw2kga5-:2bt wv fiqm) n(ox.1;s ct fyyu k;7the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force y1vtysw )x7;unat2 :k -co(fgm5i ;nwb2qf .kthe second car exerts on the first. This is an example of

  If you exert a force F bvk3ibcat65y-dc 2 x(x v8(swon an object, the force which the object exerts on you wild5kbb-y2vxci6(s x 8tcwa(v 3l

  Action-reaction force6dqw8q b q.(5mu t+rpts

  Action-reaction forc-fzz/bp ; 7zpses are

  A 20-ton truck collides with a 1500-lb car andw pscalehwodmt5 qr z30. (+5) causes a lot of damage to the car. Since a lot of damage w3pq+5(do ms0rhlae)w5 . tc zis done on the car

  An object of mass m sits on a flat table. The Earth pulls on 1g.(fp9 xraybt p9c ,nthis object with force mg, which we will call the ac.tafbxp1rg99c y( ,p ntion force. What is the reaction force?

  A child's toy is suspended from the ceiling by .*d. 5apfxesf means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action d *5fse..pafxforce," what is the "reaction force"?

  Your bat hits the ballk1h vhr: 66kqqx5f0kt zu2gj7 pitched to you with a 1500-N instantaneous force. The baf z76h: qkkx2vu0ktjg5 r 61qhll hits the bat with an instantaneous force, whose magnitude is

State Newton's three lr8co/z x,nhb1w;rd, a aws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Wsrjw6 c.ka ijqc-3/v)hich of the following is true about the mass and weight of an astronaut on th ckw/q)-6 .svjrcaj3 ie Moon's surface, compared to Earth?

  An example of a force which acts at a distancevn l8ldsp6u1 ni2l4m2 is

  Who has a greater weight to mass ratio, a perso -zqsdda:k b4x2 hl*qj2lwy6/n weighing 400 N or a person weighingqdy 6 q*/- hz24j 2akwsl:bxld 600 N?

  A stone is thrown straight up. At the top of its path, the net fom f7gou;;reymo3 u75erce acting on it mry7ueef u7m og ;53o;is

  A 20-N weight and a 5.0-N weight are dropped simultanog *)enbq)wn, eously from the same height. Ignore air resistance. Compare their acceebo)*,n qngw )lerations.

  A brick and a feather fall to the earth at their respective ;jw n,1iq* aij 1nslfx:ga6b/terminal velocities. Which object experiences the greater force ofas,* n11j 6gb :qlxji/ waifn; air friction?

  An object of mass m is hanging by a yfv,rt5)s 0tsstring from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the ,rt yt) ss0vf5string?

  An object of mass m is hanging by a string from the ceiling o (y9 wf,ul8yxdf an elevator. The elevator is movin w x9f,d(8ylyug upward, but slowing down. What is the tension in the string?

  The force that keeps you from slidkd37 ux:3+ca q ;oncs9m2hn6xja)ozging on an icy sidewalk is

  It's more difficult to start moving a heavy caullo -+e2 pn h-,go*jorton from rest than it is to keep pushing it with constant velocity,loeuoj*,h--ng l 2o p+ because

  A horizontal force accelerates a box from rest across a horizontal su/xdiz 5ha9.owj8m/xvmw t)s9rface (friction is present) at a constant rate. The experiment is rh.i8xzo wmmx 5)/v99/dw tasjepeated, 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 inmy*p )1a+dewuf: 3qwdclined ramp at constant velocity. Thus we can deduce t*qw efmdw3 ):+yudpa 1hat

  A block of mass M slides down a frictionless plane inclineduf g 6*yyd*mq3 at an angle q with the horizontal. The normayd gy* *6fumq3l reaction force exerted by the plane on the block is

  A block of mass M slides down a f0 m tao359 r09ziny. dcq+ohsurictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directe05s 9o qr na+9hm.3ucyi 0zodtd

  A block of mass M slides s.h7*cl1xsofmu f .t0:n u6 vodown a frictionless plane inclined at an angle q with the horizontal. The gravitational force is directe7ms 1hcv0l.nuoftx f:* os u6.d

  Two toy cars (16 kg and 2.0 kg) are released simultaneouxc iv kau8x;fv5/6 4apsly on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes t fv 8akiu6xcp/5x; 4vaheir acceleration after being released.

  An object sits on a frictionless surface. A 16-N mb4*u) o-ty a6y3;voujn 1 qtmforce is applied to the object, and it accelerates j) ym1uq t*3u;yb-m4o6to vna at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from,hci)e-t z/v t,o 6ydq rest to 27 m/s in 7.0 s. What is the average forward force o6ciez-ott/ ,,yv )hdq n the car?

  Starting from rest, a 4.0- :*rhoo9yuu zkyml+ 6;kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force actinr; huy9: zuy+6mok *olg on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speedj746ebzw1qd f.80izo bm yz b, of 50.0 m/s after travelif41zbdeiyjmo.z8bq zb6,w0 7 ng
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 mass from re e-isnls e:heltgz 5;v.xj3k8tj/bvka s:/7 3svlgt:j / si.:k;n esj3vk 3z/5h lx7t8bs aee-t,

  What is the mass of a person whov 0,4.ux 3spkr+:)0qnhve 6y jvthlg d weighs 110 lb?

  What is the mass of an object that weighs 250 N on2k 9pg /jucce*il8elv63e fo1 the surface of the Earth where the acc/ 16juoei ec8cg9l l e2vk*f3peleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earthn6dpd 0 ,aru il.9,odr. What is the mass of the object on the surface of the Ml.dr6 u,,d9rd 0naopioon 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 weiqbf87w l aw,fv:2 s5hgghs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objectsw7fh 5lv b:,wfg8aq 2s.

  Sue and Sean are having a tug-of-war by pulling on opposi)3z xn z6k dz1v8 )a-ogm4nwnlte ends of a 5.0-kg ropevnz4zgmo3a8 dwlz) nnk6)1 -x . Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests ongrr9l * gi;01ls7xmwd (o lw)y a level frictionless surface. A force F acts on the stack, axl*)gmsw;l(ylg i rw7o19 rd0 nd 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 hy zhbbg :2.f7/i78zr 7wxkzhb 5mx4con a scale in an elevator. What will the scale be reading when the elevator is acce7x/zb7 .hwxb:5i2c4 fhh 8mzygzr7bk lerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in a;2 zsmc3m fvx0n elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with az0mcm;s 2 3fxvn acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. Ifqi(/t(yg 7 6sjzv)wvv the mass of the person is 60.0 kg and the elevator acceleratesv7z6() vvqwy t(ig/sj 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 6e5n(nbdu:ib5)u b gr of 8.0 N and is directed due north. The second force toward thee du5:5(ngibb6n ub r) east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on thetas m;00680bmfnup qj t8d.j9u tkc*g flatbed of a truck. It is held in place by metal bracketsj0j9cktuatmdn ;bu msg8q8 .0p6 *0ft 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. 7e1m xbm cz46/h9w rbrIt is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the mb 97z4 xc6hrbe m1w/rtruck 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 x /2h07a+:mggsn +r*ollin :ld8ybpgshown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the p m*rdgngl8a/ g+ ophsx + 7bn2il:y0l:ulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what a zjoj0 ire+ap03l 5;)yl ip:iis the tension in the string? (Ign5p)ie ri j;jzala y 0p0:3+iolore friction and the mass of the pulley.)

  A student pulls a box of books;g+p; i w ccvfy*(jli+ on a smooth horizontal floor with a force of 100 N inicy vf+i*g ;(c+p;lw j a 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 boxhbre u ws2:8)n uu,r-x of books on a smooth 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 f8s:2e) ,nrurw xbuuh-orce on the box?

  A traffic light of weight 100 N is suppfm dg25k5s1-it y)r n,qd1cbmjrlu)8 orted by two ropes as shown in Fig. 4-2. What are the5il)k,y1q-g8 15mr ) dfnm srb2cjutd tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of 4a5ocz eg2hbj bg+e sfsv:/z ih)1.p( hm l;0othe traffic light?vg)i5;( pzz g bm1e aholshf.j cs +hbo2e/:04

  Two boxes of masses m and 2m are in cont,/s ,i asvwsx6ye)u)98 wlvrtact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more ma,s )t ,selxy r /auwsw6iv89v)ssive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionle;0hcox.x eu k s sp:np;nb,0l,ss surface. (See Fig. 4-3.) What is the net force on the more ma0ehpk;.,x 0:l,xbpnssn ;uocssive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. m q 0cdq5s;wuda+ kg/04-4.) If the forward force on the more massive box is F, what is the tension in the conng; 5 /+c0 qs0qadudwkmecting rope?

  Two boxes of masses m and 2m are connected(.qre2/ bvza l by a rope. (See Fig. 4-4.) If the forward fo2(q z/e.bavl rrce on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a coygqnk1 8 4nqk)wwsrpnl52i g3;ov2e5rd running over a pulley as shown in Fig. 4-5. Box I of r)q2;gynq2g 8ioe wnk 1ls43k n5 wv5pmass
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 frictionji ;1iivg sd;a 7h3c;ws between a 3.0-kg box and a desk are 0.40 and 0.30, respei3 1w v ;;cjia;gsd7hictively. 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 are 0.5l*iy 0b 3oo;92rsazz /hadxd10 and 0.r/xdzzh012;*oa oa yb 9dl3si 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 db4f 1opb:rc0level surface in the +x direction. It slows and comes to a stop with a concp0b1dorf 4b:stant 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 pulled b3uc yv ,cay.6qy a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration oc cya,63uqvy .f the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rqgz, lng-1-nv-gk kc4 est, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a1(8al xenmh l/ puck is given an initial speed of 10 m/s. It slides 50 m on the ice before it l81 lha(/xemnstops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skidblr xu7w9x. (n m*1(gyx9wlgv marks 90.0 m long. They determine the coefficient of friction between the car's txlr*(99 g l1x(ugw vn.x7wy mbires 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 arel s( oc it7l8sdkla (,0k8x1zk 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 massive box, k 07i1dokz (8tkc8x(sl,alsl what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are b: s mrx7u20n u 5a.waaw5gk1cstacked. (See Fig. 4-6.) The surface between theacbw2r ks.71x am0 n5uuwg5:a 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 massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined planen ghgdw mxa+ 1w2cv)*wu+)gs31tiiu sj* 9 2sb. The plane is inclined at an angle1cuxiwsdgjha*w2)) s12igtbw +s3un+ 9 m* vg of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides qhwi/)v5; k (oqv. sg lpy63jond:a5qdown 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 with an angle of 4my)e/e 1mqql(o4g. ;lyoq*g bpxja 3 $37^{\circ}$ 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 tilgw700pub;.u6twa t grted 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 dirac/ if2kz7 -o 7 tkj,d:ifjlz.ectly down an inclined plane, at a constant velocity of 6.0 fkj7k2l.ztioz ji-a fcd7:, /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-e(o xay4hh a1*rx 3aa 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 s7j(7 e0:w+ffi0cst8 jcdyyi a lides 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 alonofctvh)ozsh)arcwr- i,*q/ 0(t s7f 6g a rough surface. The cable attached to the log makes an an6rhftqs(cas t )-i zcofv/h *7or)w0 ,gle 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 pli +5pqb,y jzu;ane tilted at an angleq ;,b +uzi5jyp 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 anglsii 1qnaeg44a8+f u *ne of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static g4una8+ni se1fqa4 i*friction between the object and the plane?