Which of Newton's laws best explains why motorists sh u3kdsiep7k0a w *k9f+ould buckle-up?

  When you sit on a chair, the resulta fr11aa6lnmo1 y,eh /ynt force on you is

  In the absence of an external force, a moving o(4q1fwh-gl. )-9agcf-gut g gbsg4 m vbject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN ar 7prspdu(3 3xjjcmc2/ e suddenly turned off, while traveling in empty space, the starship wmr jxcp /s27u(3jcd3p ill

  A rocket moves through empty space in a straight line with constant spei 5+fh 6).gkxjxt-cfaed. It is far from the grax kci6gtj fx-a)h.5f +vitational 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 bus, facing forward, and you suddenly ehiljy( mb kci95wf e r-a8f356 :ze4vhtuf94fall forward. You can imply from this thah fwym4z3(4 99elt6-iuh :8ci5j fkarvef5ebt the bus's

  You are standing in a moving bus, facing forward, and yox:xuo3ng ..2 (7 ig1fxs2qblo osy (q39zh njgu suddenly fall forward as the bus gb7x3yxfi:ojss(n (qg l ..23uoqh9o21 nxgzcomes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the moti uaq/:nnjy x4+on of the object.

  The acceleration of an 9uf6rk) jmq4s object is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same ne4e8; /bw lsglqt force is applied to mass 2m, the;4l egbl/w8 sqn the acceleration will be

  A net force F acts on (5 n s:mjk4lpga mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass 4(5 mpjg :nlks4m?

  If you blow up a balloon, and thi:mo t4 lh7g -ge/mp(ten release it, the balloon will fly away. This is an illustraig4t7h:m(ml/ epgot -tion of

  Two cars collide head-on. At every moment during the collision, the magnituxefvi;-oa 35o de of the force the first car exerts on the second is exactly equal to the magnitude of the force foi3-axv;oe 5 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 on y )/;d gbwcmlv3, mg /0vj.ukizou will 0mk vb/u iz;g/.,jwdvm3c )lg

  Action-reaction forc8m3rysm35 yyr0x,nl h),ul tues

  Action-reaction forcx -rt(uly5,sk8hj*z8w-ovb,m;rz wj es are

  A 20-ton truck collides with a 1500-lb car and causes a lot of daw(te 5:vw,+(7he5w qpz htzzq mage to the car. Since a lot of damage ( tw5wqz(: qz+p7 eh,vwe5th zis done on the car

  An object of mass m sit8 0.djb tf .czser+2ars on a flat table. The Earth pulls on this object with force mg, . c.zdesfbj8 r+20ra twhich we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by +c353kaov ywe kzo-v0means of a string. The Earth pulls downward on the toy kw+ v- v oez0y3oakc35with 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 15j(dkjv 4zkduulo im*q 4q 13)bns:6-d00-N instantaneous force. The ball hits the bat with an instan6 ojdnuusblzq- ( *)k v3m1iqk:j d4d4taneous force, whose magnitude is

State Newton's three(vcfmv l2;8v wa (.yss laws.

  Mass and weight

  The acceleration due to gravity is lowerdz 1q u /3 n;u*sjikwgz0*u+m6*jeqt o on the Moon than on Earth. Which of the following is true about the mass and weo0/zuzmgs 3k1jjq *u+diu **en;6q twight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at aytsd1nhb7 uq0q8k )y 5 distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or 6 mg.ha.rdz7hbgb 11r a person weighing . a. hb6rbh11gdrzmg7 600 N?

  A stone is thrown straight up. At the top of its path, the net force a yp) md*h44dnbcting on iby4dnp *mdh) 4t is

  A 20-N weight and a 5.0-N weight are dropped simultaneo-h wjp1 3chlq5 en81tpusly from the same height. Ignore airh1c w1qph3n 8etj5pl- resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective termi+btsoqq : x),anal velocities. Which object e)o: ta, bsqxq+xperiences the greater force of air friction?

  An object of mass m is hanging by a string ns+t1l s*fda* from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the st*dn+* 1fa stlsring?

  An object of mass m i qd-ygv9:cqn r2ih87,:gxc j-kv 3xkus hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension jnvq i:cqygx8,c2:u-xd7h g3 -rvk 9k in the string?

  The force that keeps you from sliding on an icy sidewalx*u g ejqi)2m2k is

  It's more difficult to start moving a ho4 m288zfe-akquq uv2eavy carton from rest than it is to keep pushing it wkq2 e884-uo azum2fvqith constant velocity, because

  A horizontal force accelerates a box from rest across cm+bq jg172 au xff *dx0(zra/a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain tmdz * u+g/qfx0afb1r7(jx2ca he 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 velocity. Thus we cafo8+b2ot8nsx us-n n-n deduce tha--f8 ot2 uo n8+bnxsnst

  A block of mass M slides down a frictionless plane inclined at an angle q wit06/ b sd5nz w3qtdbc lw0)p;vxh the horizontal. The normal react q;b lcvxwdb 0)3t6p/d 5n0wszion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane ixzgq))p bqfd/wk 71(jrv n 5n-nclined at an angle q with the horizontal. The normalp- /dnzf n17vqk5w(q ))xbrgj reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictc.s1 /fsqpaj4lv - vx,yg 2so*ionless plane inclined at an angle q with the horizon -,pfj.c/ vls2v*1g asy4qox stal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on a-po d nrdijwo,/363j zn inclined plane that makes an angle of 30e with the horizontal. Make a state6nj3p/-3doiw o jrzd,ment which best describes their acceleration after being released.

  An object sits on a frict (.8lmiq dhr00,kowuf ionless surface. A 16-N force is applied to the object,ik(80o,um rlwqf 0 hd. and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10t 9+-8h vsl9lbzihs2y 00 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the cyl vz+- 9his9b8t 2hslar?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What tsp drv+h4:6jis the net force acting : d6ph+vr4st jon the body?

  An antitank weapon fires a 3.00-k 6u xh*4;irdmtg rocket which acquires a speed of 50.0 m/s afte4r6* hxmudit ;r traveling
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 puqst j wxct::pz,/ r7hoao ;a7p:q k,3ush a 10-kg mass from restrw3k;z p:c st,aapo:qt q7,:oh7u x/ j,

  What is the mass of a person who weighs 11n 4*w9ax8fqo3pt zps/ 1kw;nq0 lb?

  What is the mass of an object that weighs 250 N on theb fos.x*+v .sk surface of the Earth where the acceleration due to+ b.xfvk*s .so gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What il3yap3r6a,t4 v)rsq y)orz n*mq 72jq s the mass of the object on the surface of the Moon where the accelerara n)myrvq3jao6,7 qyt4zlqp r2* 3s )tion due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, i1kzc*ur;y sn/p pf /3and object B weighs 40 N on the Moon. The Moon's gravity is/p1u *f y;k/ pi3zcrsn one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling onai/cj+ug r:i 9 opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelau/9+ i:ijcrg erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictmru2z*(97k fhr vxb6qhs i4q2ionless surface. A force F acts on the stack,r*2 9 k6uvq7shmr bxhz(4fiq2 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 stands on a scale in an elevator. What will gvntxl-ut6 2)rb4 f/zz*)ajn the scale be )fx6)rzvgz- 4ult* an t2j /nbreading 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 person is 60.0 l,z0)1 i iql6co j8pcqkg an0o,c 86 1)zqqpici ljld the elevator accelerates 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 elevator. If the mass of the person is 60.;0ica)sk midw1k*ln; 0 kg and the elevator a*1iswc;n) d0km la;k iccelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act y6z h(dp5y5im on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of theyh(5id yp mz65 mass?

  An object of mass 6000 kg ); qsckfj:2wp(k8lbjrests on the flatbed of a truck. It is held in place by metal bracket8bk2)jlq;: ckpj sf (ws 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. It is hedsn*/ x gqxnve(zim9;3f04:tj2il gj ld 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 s0tj4 mil ;nixq:e2 js39n g*dvgxzf(/ lide forward into the cab?

  In the Atwood machine shownngtl7p r.d-7 z 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 anzld gn 7rp7-.td the mass of the pulley.)

  In the Atwood machine show(vp)y fvk,r4wn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension i fvk rwyp,)4v(n the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor /rme casu py28soxqk7ju:p/a 0r6e:+ with a force of 100 N +e80 rs6sxppc 7oe jky/2 au/m:qra:uin 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 box of boo9qun/ el gg1vx3:25kmtg cx -wks 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, wh3-glcmt9k:ge q12vx w xgu/5nat is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown k /7fb*wo3lg3rq8-a9f qjrzt 7sx1 f7uwy6 jrin Fig. 4-2. What are the tensions in the rop- af3rw77ts3zklfj*9yr7 gr/ q w1qx f 86bujoes?

  In Fig. 4-2, if the tensions in zus*xls e vh+z s/pab 2v,b:3/r)zl9tthe ropes are 50 N, what is the mass of the traffic lizstpsv*9b vl+)brl sha3z/u ze 2:/,x ght?

  Two boxes of masses m and 2m are in contact with each other on a fs 0hz 7*m,;nm opo7ipfrictionless surface. (See Fig. pmh;,o z nof07*mi7ps 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses s u6z sr-haq 2q9x-,wfm and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the nax69s wsq, q 2zu-h-fret force on the more massive box?

  Two boxes of masses m and 2m are connec spw.qvnd77xp)d a+7(pwz wm;ted by a rope. (See Fig. 4-4.) If the forward foxpp.7(psn;ad mw7ww7+zvqd) rce on 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 rope. (See Fm( slb7hu 8g+mvdbts7*q 75nj ig. 4-4.) If the forward force on the more massive box is F, what is the acceleratiot*7g(jld8uqm s7bvhbns 7+ m5n of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4 6uw+fw9.icz8 ilq/skg9iw f(-5. Box I of massz8gfql9uf .wwc +ii/s 6k9w i(
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 a 3,2benn gm qv;h f816xu.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on t ;q,1mn8fg e buxn6v2hhe box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wjxug-r*b( j )(juc8 ntood are 0.50 an-rx*8 )gbuj( (juncjtd 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 l) -rxvx(eaocgwu6gi78 p ,k -ievel surface in the +x direction. It slows and comes to a stop with a constant acceleratio7 g-ugir(ix8xkap,6vec-w o )n 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 m.d8 8km .2 a:hbkwdkvlmpj 01sr/3n6x, nbbz. A 3.0-N frictkb v.k/1bn w hmr lnxmp.6db3zj,:smk2 88 d0aion force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates xjtt es u840m)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 slides e z-dti(xxch 2v;s-+w50 m on the ice before it stops. What is the coefficient of kinetic friction bet(c+v--2; zthiex wsxdween the puck and the ice?

  During the investigatzeb9 c:mpdh*(uc(g m6jqk:x* ion of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to bek( p6uc9:jbxd m*h zc*:(mqg e 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m an gie*z 1pd5;ded 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 massive box, what is the static friction fo;ged 5e 1z*ipdrce on the less massive box?

  Two boxes of masses m and 3m nq1vre)s3xwrd2 i72 lare stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfacl1eidvq 2s2nx r)w7r3 e 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 frictionles;l audzb9m*y wa5hb 4+s inclined plane. The plane is inclined at an angl5;hl* d+a 4m azb9bywue of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mawp4 hep e))+,+ pfw),q qazdsx3l cum6kes 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 oh7zp ; cww6zy)qtn q3ol (f:94r4,jxfhq+a n$37^{\circ}$ 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 inclined0lz9kmt l;d*d 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 iz 2y/78k 4p 8 nk:lqdk.bnypqinclined plane, at a constant velocity of 482k7n:lykzp/ 8 kidqnqby.p6.0 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 7 y/wg lyif5:jslides 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 s/bc.h 4ww11pfzcqf) y 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 along a rough surface. The cable 01gch5eotbek:d eq lde8 ;/:eattached to the log makes an angle of 0gb; 8oleec15qkhed:t :e/de $30.0^{\circ}$ 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 inclinednagsv;4ajo0ii+ i g66 plane tilted at an angle of66ii 4+s jon ai;g0agv $33.5^{\circ}$ 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 gnh67 +,de u.sak- feyinclined plane. The angle 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 aeg,ne6 +hsku.7f y-dfriction between the object and the plane?