Which of Newton's laws bes7wmxcf ,u2 d:et explains why motorists should buckle-up?

  When you sit on a chair, the9oyel ybe 2sku+0;2xx resultant force on you is

  In the absence of an external force, a moving object wi m)su*lo8 f8qell

  When the rocket engines on the starship NO-PAIN-NO g 3rcv117;pugd urn3l-GAIN are suddenly turned off,p g;gldu1 urv3rc1n37 while traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant speed.*ur )v-lcb9b u1ms*xn It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to-c s u)v9m*nb*lrbx1u sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forward*qihg2i oqn 0:gg7 snwc*y.3xkpm*-b. You can imply from tq*wi*n2y7os*m:k.pi 0 n bc3qghg g-x his that the bus's

  You are standing in a moving bus, facing fo/jn,z *f iohr,rward, and you suddenly fall forward as the bus comes to an immediate stop. ,rj,zni hof* / What force caused you to fall forward?

  A constant net force acts on an object. Describe themhy) 6,cm en1r motion of the object.

  The acceleration of an objectvbga,:7n5jrqog v /v 7 ;ush)r is inversely proportional to

  A net force F accelerates a mass m with an pe)8uq dq24a dvm4-bu2+g aauacceleration a. If the same net force is applied to mass 2m, then the acceleration willv2 a uu4d2aquqpe 84gd)a-+mb be

  A net force F acts on a mass m and produces an acq :bt gh/5e/zlceleration a. What acceleration results if a n/:eght /zbq5 let force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the(9 6lyw+hk wfb,obmjuey+e ,2 balloon will fly away. This is an illust,weu ob+kwm2(e j96h yy+blf,ration of

  Two cars collide head-on. At every moment during the collision, the magnitudexpm85e *15fnn+ijd qg of the force the first car exerts on the second is exactly equal to the magnitude of the force t15 *mjnd8pxei5g q+nfhe second car exerts on the first. This is an example of

  If you exert a force F on an object, the force wh/5gh7k varba53vou3 eom8o4 eich the object exerts on you wiva5re gmo38uak3o hv 4obe/75 ll

  Action-reaction forceutwi5m8,i r14m un 8ovs

  Action-reaction forcc.f+cw9r rbcrl c,r6 x34l+ rnes are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damag+*u9sab sb* fd, ryl(ge to the car. Sud b s*fsa,*(rgby9+lince a lot of damage is done on the car

  An object of mass m sits on a fllemdr.ut;-5 3 xzmp. rat table. The Earth pulls on this object with force mg, which we will calmrld.-3pex ;. r u5mztl the action force. What is the reaction force?

  A child's toy is suspended from the ceiling bhb44sc /ur)5ej1i3fg 3ur jf fy means of a string. The Earth pulls dowghffju35)i /r1 ebu4sjf4cr 3nward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forb*/p b0vptsu1m1w mkw63 w)vrce. The ball hits the bat with wb3t 0r/6 mpwv)1uw1bm sp*k van instantaneous force, whose magnitude is

State Newton's three laws.qws+imvin * 4+

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earm9 tz pr yl, vuypyane:1:cd*8r9w* 9sth. Which of the following is true about the mass and weight of an astronaut on thesy,yzd*p9 rc : renv uw:*9at8p9lym1 Moon's surface, compared to Earth?

  An example of a force whic j-g3aj-9-jyfrouz* ph acts at a distance is

  Who has a greater weight to mass ryhn omh2hppw41 y+72 hatio, a person weighing 400 N or a person weighinymwho p7ph4h2n1y+ h 2g 600 N?

  A stone is thrown straight up. At the top of its path, the net force actingfn6x i zwc ;n 9d/tuok3/1wf+w on ict zw1fnf+wo ;dn/x/ 693iukwt is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the jgz)tdk36/hi/3xt e+g9kq e tsame height. Ignore air resistance. Compare theirk gdk3 +tjq/ z9tg3/t)xeehi6 accelerations.

  A brick and a feather fall to the earth at their respective terminal velocities*0qy6u.cdmztvzz(d e .ske11. Which object experiences the greater force of ayec z td u(zzq*sdkv1 me0.61.ir friction?

  An object of mass m is hangingo o vw8fokd,l9*a*,x n by a string from the ceiling of an elevator. The elevator is do 8xn,*fv,wlo*ao k9moving up at constant speed. What is the tension in the string?

  An object of mass m is h1ihslb4rt9.n5 w vcx 6anging by a string from the ceiling of an elevator. The elevator is moving upward, but94vcnh wx65 trl sb.1i slowing down. What is the tension in the string?

  The force that keeps you from si rkdz;mdugja.n8 +/*xsp r+ 0:kj4yq liding on an icy sidewalk is

  It's more difficult to start movi;y9kb+ 8 mc b2rgzzhbp3m6;afng a heavy carton from rest than it is to keep p;kbm p 6 zb;f2a9bmyh8zr3g+ cushing it with constant velocity, because

  A horizontal force accelerates a box from rest across ae753kel mz iw2 horizontal 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 is doubledewl 57ie3z2k m. What happens to the box's acceleration?

  A packing crate slides down an inclined ramkd 3jpa6sh80h p at constant velocity. Thus we can deducepj8h63d0a hks that

  A block of mass M slides down a frictionless plane inclined at an angle q wikb,mv3 z / 3frce y+35+qvqvnbth the horizontal. The normal reaction force exerted by the plane on ezc3y5 q,bk v3+f+qr3mn/bvvthe block is

  A block of mass M slides down a frictionless plane inclined atdx/ (lkqdi 052fgd dj. an angle q with the horizontal. The normal reaction for .i5 /ldfd(2gqkxdjd0ce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an antvj2q 2 x6 xm;xtcn6w(gle q with the horizontx2 nj(mxw2x vq6ct; 6tal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 i + heirzfs5.p: pmx *5w7;bfap j7lg7kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes thew5aem:7 r7.xbf *is;jpgz7h+lp 5ipfir acceleration after being released.

  An object sits on a frictionless surface. A 16-N for qf td4*d5hksys .wx0dn8u-c6ce is applied to the object,t 8ws6u-ny dx 04fc*s5.qk dhd and it 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 27d8qy8 h 0n/csf m/s in 7.0 s. What is the d 8f c0yhs/q8naverage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s3nowdi hs g+33 in 2.0 s. What is the net forces3ow3d3gnh +i acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50*eb o1n8:ldyw.0 m/s after travelingbl*1end wyo8 :
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 fe 8ws1tgq*xt4e knny /o0jlic -1:m o9orce that you push a 10-kg mass from res*xgnnck ols1o1emqet/ w 49-j8t y 0i:t,

  What is the mass of a person who w 0h5xc4df t1iteighs 110 lb?

  What is the mass of an object that weighs 250 N on jm(*soiqc:p xu4tt9* the surface of the Earth where the acceleration due t*jto iqx up* (m94c:sto gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. 0j l229zbk3l3cn d dcb What is the mass of the object on thbn2dd9 3 jbcc2l3lzk 0e surface 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.k,c),tne pc11br k jc4 The Moon's gravity ke1b,njkcpr4),1 cctis one 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 tn*y/n)twsq148j i-fz6 ga mw a 5.0-kg rope. Sue pulls with a 15-N force. W4q8 w/mn i)ty -jgsaz*t6f 1wnhat is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a lev4lp)v9j tis lu8r-j*wa4 xmo8el frictionless surface. A force F acts on the stack, and it a xoi9tvjjl 88arm) 44-upwls*ccelerates 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 scall-+ pqo8fw . +bjtn0che in an elevator. What will the scale be reading when the+-hclwq.0 nf 8op+ btj elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale vwppc :c2 -wcphm) 1u,rides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an accelerap,uv2 c1h-pw) pmwcc:tion of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person is 6k+wrjb,ey6fmn 4wt tjfh+5 +-0.0 kg and the elevator accelerates upward with af r+,w j64bwy+-je hkt+5fnmt n 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 force8rej 4b/dx7r : mil5)g-e/fhnndxf b2 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 is the acceleration ij28d7l/h4 e:fe rnfxm5xrg)dbbn/- of the mass?

  An object of mass 6000 kg e gzw c207k1:ltfu2zc rests on the 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 distance if the load is not to sli ec2w:02u1t7 czflk gzde forward into the cab?

  An object of mass 6000 kg rests on wls6- q8mvu vm rv-6 yzc-me9 (+9yejmthe 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 im 6-6m 8vuey-v c jesmy-l9+r9(wmqvzs the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machinc6 6hh+x(eg 0:ldubyae shown 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 thebheua (g:+l6c60yhxd pulley.)

  In the Atwood machine shown in : -;qe(5omwdu -blznp6p/pt vFig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore l( n 5vbt q;/ u-epomw6dz-:ppfriction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force nps9 tfc 1f sck,qj72-x-0ee *s)ygd mof 100 N in a direction of 9x1sj7 0k,sgn mf*-c2)e fystced p-q $37^{\circ}$ 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 aj-r/s xgz)m, 3ya ys4floor with a force of 100 N in a direction of s3 yr)-axzg ,majs4y/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 t x -p2qqgeb/,gl7b:o+dj z/nrwo ropes as shown in Fig. 4-2. What are the tensions in the re/q/bxb7pl + -j :,rdqo2gz ngopes?

  In Fig. 4-2, if the tensions in the ropes are 7hl5ikt) cx4i 50 N, what is the mass of the traffic lii57)h 4clkx tight?

  Two boxes of masses m and 2m are in3ts4lf5 s.js3r 0ddt g contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the trt0d 5gf4jss.sld 33 more massive box?

  Two boxes of masses m and 2m are in cofv45te 5bo/dt7(y p k8lry4zo 5mt6utntact with each other on a frictionless surfac55l6 vk57 dt /eoof4t4 m8ttryz(ubpye. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m py5;c5p8j al ten5z6 band 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what itap5n55ej l6 c 8bzp;ys the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If t:.3hdvv ntk5c 4nui (ahe forward force on the more massi:vu3i.h(n a4ct5knd vve box is F, what is the acceleration of the less massive box?

Two boxes are connectna;t2msn/ll d8(zk6zsrc5 t,ed by a cord running over a pulley as shown in Fig. 4-5. Bo ma/85n ts;s,(nzl6dkr cztl2 x 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 kinetic frictions between vb5l w5s q3*r 9ldrzj ((wvkj/a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force ovbk*sl 539zqd(r(wjr5/ jvl wn the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kine u31npex6m9e etic frictions for plastic on wood are 0.50 and e eemnp3 6ux910.40,
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;w:5y )fzrjnk (q/vpm level surface in the +x direction. It slows and comes to a stop with a constant acckm(rjq:ywz v)/fn5 p;eleration 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 force. x-pf. 8z yjve2;fp/rt2l +0*ilaqamw A 3.0-N friction force retards the motion. What / l;zywjfrxa*l+t0q82.pm2f e pi- va is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at eg9x/ib74cukzwl+ *o 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/s. sn.vqgkkuz;4 566q td It slides 50 m on the ice before it stops. What is t qgu szn66.ktq 5;k4dvhe coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffice/qm i *:os/ (rcvdkvxaam0g8j 48ai) accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires an4 a 0sqc/xvk:i* gmmov8ea)8 (iard j/d 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. o7kdy: zew.q2i ,t6,fpqmo 0u (See Fig. 4-6.) The surface between the more massive box and tu,k oiyp0zqw q:ef,d76ot2m .he 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.) Thx0.*zixsgjj a,id( / ce 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, what is the coefficient of stati ji/jx(,axd0zgi. s* cc friction between the boxes?

  An object is on a frictionless inclined plan0hlywio/b5v2q*5eb e e. The plane is inclined at an angley ebbh2 0wl5 /vio5eq* of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down n9bv1:ts8epg9 gv:ogr od slkp);b).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 y .8o69 3vhwl2mgmfhuqozxbns6y0p4u5 ja 94angle 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 sm3fvk+q kfc zi4c t+v:/h .-uvqooth 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 directly down an inclanx vq xcw 8 u)*;l.e r6sd6)h*tati,mined plane, at a constant velocity of xuleht6is6 ;qrwatc.) *a* )8vnmd x, 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 down a z4wrw,9ln9mbgeayn,/l8* j hul8p8k 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 slides dow4*xyh b:4i2l;qq1: orny ierin 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 cs xl;3)opcvn 2able attached to the log makes alp;vo s 3xc)2nn 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 inca .vt/)a , k6ojh .mv(,k7hhwmx7benqlined plane tilted at an angle)k7,o7mtnx hv,hve h 6k q.w.jb/m( aa 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 oga;0xzwcm oo )7f::qhn an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs o;h q)f0 a:mwzc:ox g7is q. What is the coefficient of static friction between the object and the plane?