Which of Newton's laws best explains why mo /3,ddi xlrr8ilc :/lrtorists should buckle-up?

  When you sit on a chair, the resuln08 kjm*t)zbx tant force on you is

  In the absence of an extern*vg+,itv.c o( fp:spgal force, a moving object will

  When the rocket engines on the starship NO-PA ox3 w kqtp4k,8rr+6vbIN-NO-GAIN are suddenly turned off, whi6r3 qrpkt+8b,v4 wxok le traveling in empty space, the starship will

  A rocket moves througjx n/ ;yt,c(aicr(ud; h empty space in a straight line with constant speed. It is far from the gravitational effect of any star oj(; a /; (rincc,tduyxr 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 bus, facing forward, and you suddenly fall 5a tw+v7nyjn+/o2gy oforward. /vgo aoynytj + n2w5+7 You can imply from this that the bus's

  You are standing in a moving bus, facin4d rk:z14ocor8 tuls, g forward, and you suddenly fall forward as the bus comes to an immediate stkusr,4o :o zd8c1rlt 4op. What force caused you to fall forward?

  A constant net force acts on an object. Describe the mavb7ogh8eqa; hhl kv+q1;mtfn5qi ni80; v 3-otion of the object.

  The acceleration of an ogf9o:k,h4gtxkk /hx1 bject is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net f,v9r2q: +ytfosux4yoa7g ssts 9a+:h orce is applied to mass 2m,: v tqa:yfy2s ++xh9sr9ua4ts,so7og then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What6oz6(r9xip.o vh m/kd acceleration results if a net forohv.6pi(z69oxmk d/r ce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, al02l 3)fnt w ()itd4nzqx k:ythe balloon will fly away. This is an illiyf):ntlk)2d0 wxtqz(na l34 ustration of

  Two cars collide head-on. At every moment durir2z1/c sq )f b7ma*dsjng the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. q1)j7 sdfb rcs* /2mzaThis is an example of

  If you exert a force F on an object, th,h pdldc/9e;g .8zip;vsg la np 7t.9se force which the object exerts on you willtp/.sdv; g zp;9lh987 ia,n lpdgce s.

  Action-reaction forc8:sqp2, mh,+t hnbsmr es

  Action-reaction forces ar8c o+-d zr*x5amk5dzaged ax-1b 4 a)re

  A 20-ton truck collides with a 1500 dcx1 ts4932,q9il,ng7tc hry )gzqi p-lb car and causes a lot of damage to the car. Since a lot of damage 1ch dl,79 q 2qrxyt 4igp) ctis,39nzgis done on the car

  An object of mass m simdmr9hpa3 5a*pa :q 7jx p6my7ts on a flat table. The Earth pulls on this object with forcea rmx63ma 5d7mqph7 p :*py9aj mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of am5xo9 rn 7avi- string. The Earth pulls downward on the t-n57ra 9i mxovoy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ballj+e,y:kwcocbsd8 y-v) )y gn- pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whosd)c-cves : -wyygj8, no )by+ke magnitude is

State Newton's three o2 7)yx5(bj4bm h dnsolaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon1i r:ku)jo1wi4* yi*sf dt t/x than on Earth. Which of the following is true aboft t*k 1y): rxs j/1diuiw*i4out the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acmz(in* 9zq9nmtd*s *l ,r f/ukts at a distance is

  Who has a greater weight to mass rat1 b2durbj-m mr(ba5 z:hg 0cq/io, a person weighing 400 N or a person weighing 600 N?z bdq c r5jrhmab(/um -:102bg

  A stone is thrown straight up. At 0g3;2 hb6u .*tjpo xrpcoio :jwv6p6 zthe top of its path, the net force acting on :*pr6 upx2oohoj30t zc p.wiv g 6j6b;it is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same w+ p1at;nt4 myg 9ndydf :w;f7height. Ignore atdt;1 :f+a yy9 fd7;p wnwmng4ir resistance. Compare their accelerations.

  A brick and a feather falr o4ywk -gi-m/l to the earth at their respective terminal velocities. Which object experiences the grywg4-ik mo/- reater force of air friction?

  An object of mass m is hanging by a i46avk,bpxq) string from the ceiling of an elevator. The eleai,46vxpqkb ) vator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. Th, /;jf 6mpwpmje elevator is mwfpm6j,/ j;p moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icyrhhc 9 ffpa k80mo +19ys: g9sd:jck,j sidewalk is

  It's more difficult to start moving a heavy cart z60hlx*)g cfsdl+ de7on from rest than it is to keep pushinl0 xdcsfde g)+l 7*zh6g it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surfx*/y0 zh:8 wzegbsr gn8qas67ace (friction is pqbw6gea h/ nz87r *g 0xzy:ss8resent) at a constant rate. The experiment is repeated, 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 inclined ramp at constant veiio3e f;y9,7t-c bmkblocity. Thus we can dedu-iicktey mb7b; 3of 9,ce that

  A block of mass M slides down a frictionless plane inclined at an anglr 4, o:oq8spe3i o j6hvii/gzjby3 9/le q with the horizontal. The normal reaction force exerted by the plane on the block isiy6o8 h3jo/z3,bi es4 v:9p gq /rijlo

  A block of mass M sli :71ixwl-fwn0eww 4djyg. kp: des down a frictionless plane inclined at an angle q with the horizontal. Tgkp-7j i0yx4:1.w dwwf:wn le he normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionjmwa5t p/d(4js95m-ye du/s oc2x4zyless plane inclined at an angle q with the horizontal. The gravitao d/ j(sawz 2jsyem4x5ypd-t cu/5m94tional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously osv yv9ce4uo/5 n an inclined plane that maky4covvu/e95s es an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied ;7 ;2-nnt7xyibcz3,r fffoxn to the object, and it ao ft bf3n-xn,zi7c yf2r;x;n7 ccelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rese8f m15kr1) e0r lz ytd,ospo/t to 27 m/s in 7.0 s. What is the average forward f110t/5y8 kfrlsd zp m)e,oeororce on the car?

  Starting from rest, a 4.0-kg bop sse .bt wfs0 v(7i5vfc+60qmdy reaches a speed of 8.0 m/s in 2.0 s. What is the net force ac (ev6svmcbwts5qs i 700p.f+fting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires bfc24)xvzga4a speed of 50.0 m/s after cg4xz b2) 4favtraveling
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 dj;mt *b 71a*qouohxg:u.v;s that you push a 10-kg mass from res.amtxo; ho**b1 uu7;jqg: vs dt,

  What is the mass of a person who weiere1lodzjp qkg4,yje- 00. )ughs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth +)n y :/bqukdnwhere the acceleration due to)d/ nkqnuby+: gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the+o4/3l4zkz nz dmy sl6 Earth. What is the mass of the object on the surface of the Moon wheoldz+ mzny3 4/4kl6zs re the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth,re:prn*5cd)lp, cd0,3sj 3k taxatj* and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Comjkxc) c **:r aal5nj, 3p,0e3drptsdtpare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.xo +; pe*9g ax; mchc/nt6 olsewx/ag:a6u6)x0-kg rope. Sue pullsat/66c;g pgs 9lxx/e ;wuon :achx6xoa) + *em 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 on a lev v:los83p 4wuc4vn5 xuel frictionless surface. A force F acts on the stack, and it a o3 uunwx4:8lvpc 4sv5ccelerates 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 ellqkpqv5g;uf;)(qtp. ,x t x+sevator. What will the scale be readingqx. uq;q g f vst+x(ktp,5l;)p when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the pers gyp.l9q-/kg 7url1 xnon is 60.0 kg and the elevator accelerates downward with n1pylx -glgurq7.k9/ an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in 8i6xu2yc-aq0rhm/0ho t,t (a0xfa( prn b 2tjan elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with ata x0q20af(, au6 2y8(oxih/t rnmtbjr0-c hpn 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 of 8.0 N a a,m;3x ncagb2nd is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of c2agn a3; ,mxbthe mass?

  An object of mass 6000 jm;5e 9:xsqct kg 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 jex9 ;cs mt:5qload is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in pxbag/4(h fy2kk(6 -cy lm/mdblace 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 slide fo2 yky/c/(mf(4bh6m lgxbka -drward into the cab?

  In the Atwood machine shown in Fig. 4-1, i4 bs,ec 2fu/h3 g6a*/ybdyupbo p jcz *tr)10yf M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction s3py, 6b)c2br0g4d uyabu1e* t/fjoh *czyp/and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.6 3sqe r ;jbqeh2p7o *7ovoi(i40 kg, what is the tension in the string? (Ignore fri7ihose2e67 boq(q i;ro*3vjpction and the mass of the pulley.)

  A student pulls a box o zfghi1i.)q8tmz 9b:mu-;bot wak5k0/ qkm .bf books on a smooth horizontal floor with a force of 100 N in a direcztai9q.5 ohbwtim1mugzkf)kb0- 8b qk;m:./ tion 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 funeua1 sf4.h3ha6v3 s orce of 100 N in a direction ou.ssah3neu14 h f3a6vf 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 sxo.k7 jo 9)mikr3 gf9eupported by two ropes as shown in Fig. 4-2. What are thekor)o9 jeg f.k7xi39m tensions in the ropes?

  In Fig. 4-2, if the tensions ieab 0s n)v 5qegg(*/pon the ropes are 50 N, what is the mass of the traffic ligha/ oe5qsn gg *p0()vebt?

  Two boxes of masses m and 2m are in contactwlwgi+2) ud utoz .15s with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleratio uzws2l51)i gdw.ut+on of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictio 01ww ,w jp..xkiff6,r;h irvpnless surface. (See Fig. 4-3.) Wharf1 v;6,fppxjk wr0,i .w.wiht is the net force on the more massive box?

  Two boxes of masses aawsxtt s rk,5i055) r;vts9dm and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the a) 0rxi5 ;st9ts5w kadt 5v,srconnecting rope?

  Two boxes of masses m and 2m are connected by a ropcc *ll j38clpz5;e k6ke. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lelp68l 3* lcjek kc5cz;ss massive box?

Two boxes are connected by a cor mh oltuz8k4v98a2gt+d running over a pulley as shown in Fig. 4-5. Box I to h94mgu 2azl+ 8kvt8of 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 rx 0wyjrb-6r )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 fo)rw0r r -bxyj6rce is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood ar139qwi*vys xtv.v py6e 0.50 and 0.40,sv.xitw* 31 6y9vpqvy
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. It slows and comes too he xoqzc6z;e:0+ 2tm a stop with a constant accel +o;xeecmt qzh2:60o zeration 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 sur)*o-bpy g ;bxvvbip/3face is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. Wbbvyv x o;/3*)pibp-ghat is the acceleration of the object?

  A horizontal force of 5.0 N acceleratehzsc t+2 d)71 x:otctfs 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 10 m/s. It sax2, og zkwz7)odg*6jis2y t6lides 50 m on the ice before it stops. What is the coefficient of kinetic friction betwex t2 ay*wi z)dko6jg762ogz,sen the puck and the ice?

  During the investigation of a traf-01glktt x*qdt;nh 7 kfic accident, 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 tkt g-h;7* d 1qkxltnt0he 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 surf3kg(of)l0w ;j2q tvyzace between the more massive box and the horizontal surface is smkvyg wf2 0;tzlqo )(j3ooth 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 jal6vm 8zd-ii5t: ,:u cpx rj63m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smoo8d:auzp x r6li 5ji6 :tc-j,vmth 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 0260tk+w rujqp6 qcutplane. The plane is inclined at an angl u6+t2 kw0 rj6tpqqcu0e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of qv7558 x,vrut w droa0$10^{\circ}$ 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 anbnc zxw, +9bg*v0/wwz 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 ruao*)4 qz: .qnm5ds xan 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(/txy2l8r wk w/buqid9*vg2 r an inclined plane, at a constant velocity of 6.0 m/str2wl/ xq 2vyu9 d (/*8ibwrgk.
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 d1ws4v m5 t e +*rotvq2,,wncmzown 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 slides down a :tus.vjh7a ooc np))(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 cabz, d4iidq a - q6it;l*ud;t.crle attached to the l id 4lq.qi ;c*tu6a-rdit,d;z og makes 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 released from rest on a rough inclined plane t-1gom(igw94p1 ib iw kilted at an anglei ow41m w( g-1i9kibpg 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 gzqf453 f0vbbq radually increased until the object begins to slide. The angle at which this occurs is q34fb bv q0z5fq. What is the coefficient of static friction between the object and the plane?