Which of Newton's laws best explains why motorists sho:i1k5y4xmne y wpw /2culd buckle-up?

  When you sit on a chair, the resulw 0zv,g3b1h kyiv m4i7tant force on you is

  In the absence of an external force, a moving 7gu6nzw* ,0rf6zu25wswv vyiobject will

  When the rocket engines onvn k2xy,t0 .rg the starship NO-PAIN-NO-GAIN are suddenly turned off, while tragt0 .n vryk2x,veling in empty space, the starship will

  A rocket moves through empty space in a straight line wi5.whq3e, zphu c13tvak cjc4 h39n9vlth constant speed. It is far from the gravitational effect of any star or planet. Under these conditiolz,.hak1 ch53hjue49pw9cv 3 cqtv3 nns, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, xo9w5zm5aiw2 x6) )jy,quitu facing forward, and you suddenly fall forward. You can imply from this t9 5wz, tjmo)ua5 xy6q2 iu)xiwhat the bus's

  You are standing in a moving bus, faciax(a f)in.qz85e:p vrng forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused youn) (:vaqrpxef z5.ia 8 to fall forward?

  A constant net force acts on an object. Describe tacl h4e0 e2q+phe motion of the object.

  The acceleration of an object is inversely prt+f:wi8z 0 etzoportional to

  A net force F accelerates a mass m with an acceleration a. If the same ne ++sroonw9;fnf .zft9t force is applied to maowno+.s9+rf9t;f z f nss 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wh-j teqbj;;w( 4*:xp bwsn)w qjat acceleration results if a sj;(e4 bb*) w;qpnj w:q- twxjnet force 2F acts on mass 4m?

  If you blow up a balloon, and th-d2tvg-h9yzt5nn k4z :gd.g cen release it, the balloon will fly away. This is an illustrati4d92 tvghc- n.zn5tgk:ydg-zon of

  Two cars collide head-on. At zgnmmw:*lo h9:x t7s) every moment during the collision, the magnitude of the force the firsthw)*x ngt:7ol 9zs :mm car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an obj ixpqa7,y./lpcm0x )w3 -ckfq ect, the force which the object exerts on you willq,kp-cx.pl x 7 wmi)0 qcfa/3y

  Action-reaction force gt;t;z 2ep,merc/h-j eia- f:s

  Action-reaction forces e1*nj .jw0r(c+ aklu98 geani are

  A 20-ton truck collides with a 1500-lb/+,vt hsk g*lo+dv-vb car and causes a lot of damage to the car. Since a lot of damag,/t+svv k *bhdolg+v- e is done on the car

  An object of mass m gp1vr*zhzy;gld50z * ,lcl4n sits on a flat table. The Earth pulls on this object with force mg, which we wilnvc 4pl1glz,zh5*rzldy* ;0g l call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by .,ute/07a.uef1 f 5hyoudtrm means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," wha /rd1aff,e.ty57u tu.0 ouehmt is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. Tig60bh49t dbjf27h-aj,sfx*k x+ a wohe ball hits the bat with an instantaneous force, whose maox6hga79w+ - dkj2bsbha,0 f*tj x4ifgnitude is

State Newton's three laws.*d+fmk1 8hxm (qrj oc2

  Mass and weight

  The acceleration due to gravity on4b h;:9 lwe0x cpy6uis lower on the Moon than on Earth. Which of the following is true about the mass and weight of xbw:40ec y69np;oulh an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance y3 r9ybz g,hm7is

  Who has a greater weight to mass ratio, a jaut*7d3+ja lmhozpa++i5z j 3t7v1 sperson weighing 400 N or a person weighing 600 71*siuht7 5ja3+ vp3z+l a dtj+za omjN?

  A stone is thrown straight up. At the top of its hu q1tj jwe6l02o6 8arpath, the net force acting on jwq heuat1r0l8o 2 j66it is

  A 20-N weight and a 5.0-N weiywaejcqs 5k jc-(3 t-ux +.*lgght are dropped simultaneously from the same height. Ignore air resistance. Compare their accelerati3(-ujk *qy+ce wx glat-sjc5. ons.

  A brick and a feather fall to the eta 7i9*w:ub wgarth at their respective terminal velocities. Which object experiences the greater force ofi *g awt9ubw7: air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Thepg1q,nkk)0s pq 27g ezm5j4l uny*qml52w5u t elevator is moving)0*n54 gwuuj1lqgz2 7k k5 ,qm nepq 5ytp2msl 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. 9 +cv1rufsj-ydk 4q m; The elevator is moving upward, but slowing down. What iscds-4vkrqy+m ;f 9ju1 the tension in the string?

  The force that keeps you from sliding on an ic;h+f7 l(gckt ly sidewalk is

  It's more difficult to start moving a8zt y-r(vu 1s 1szvto, heavy carton from rest than it is to keep puzt ,1z1 8svvtyr(os-ushing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizo2 0v-e(orzphg 0fr *3;o c gbd29xkpnpntal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exceo -eg;p k vc0(dnhf*x3ppob g9z2r20rption that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thup w5+dbdtvr-/y 298v(aotc gis we can deduce tpyovgc9i (av5dw- 8+trb2d t/hat

  A block of mass M slides down a frictionless plane inclined at an ang;yu3v3 t) vva7 wa3)ta hvp*ggle q with the horizontal. The norm3ay)g*v)a 3g3tah wpu7vv ;tval reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane intxu fnsn4.*lb4 ph; :iclined at an angle q with the horizontal. The normal reaptifs;.: 4b *xlh4n unction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with 1gvicqml4lb xy4c9t5 bb)9; hthe horizontal. The gravitational 4h;qit 4v5 9yglbbc1xmbl9)c force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslylfq.b7)gje h8 on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after befh ) e.l7b8qgjing released.

  An object sits on a frictionless surface. A 16-N force is ap4mof506,ephf ajj, o mplied to the object, and it accelerates a0j,fo 54,jommp fe6hat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 msidd+;s1 .sek /s in 7.0 s. What is the average forward force on the car?d e+;sisk .ds1

  Starting from rest, a 4.0-kgyr/ri;le , g ggaj7.lh 6k7.zj body reaches a speed of 8.0 m/s in 2.0 s. What is the net fo/ggg6y;r ,7jahr. j.l 7izeklrce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquiir5o x7go,lb 0h 5rj+yres a speed of 50.0 m/s after travelinyi+go r5o hj7,xr l05bg
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 p u *4bc)l; xdw.mfkd:eush a 10-kg mass from res*mb)fx4c;:u .kwdl e dt,

  What is the mass of a person who weighs z (t n6/e,oigw110 lb?

  What is the mass of an ow)ag/3yl/t n object that weighs 250 N on the surface of the Earth where the accelerationgan/lt)/yo3w due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 t b cp50.uddrn3kvg 3zw4 - s4g4v.ibukg on the Earth. What is the mass of the object on the surface of the Moon where the accelerat4z3r5d.i3 btk.guvd4vcb pg0 -n4 swu ion due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs- so1ct(p irxpjb-0:w 40 N on the Moon. The Moon's gravity is one sixb(scpp-io x1 tjw -r0:th of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppositer6 3v lhb,q9vq ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at hq3 bvqr9l,6v $2.0 \; m/s^2$?

  A stack of books rests on a level fricb5vexa2b8u)3 mrm:v z tionless surface. A force F acts on the stack, and it accele2r b e:x zm5ubvv8m3a)rates 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 scaxw)ov9s+x uh98xve. tle in an elevator. What will the scale be reading when the elevatoxwuhs)xv+v99 e xo.t8r is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale snvlnlo jjn(s,*51s)d)he s0e 3ghl7rides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration esls1l)nhv5 ne(j lg ,s7so) *h03ndj of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rid-p 0 wdsu9v .llwpb8j7es in an elevator. If the mass of the person is 60.0 kg andul7bwjp0w .-8 vps9ld the elevator accelerates 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. Oh lti*uu3/xu;9nk, bwqcb;:bne force has a magnitude of 8.0 N and is directed due north. t9i:cunb; b*k u/qx3l;hb w,uThe second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rest7nd7vj f18tlr6trjf kh:ql 6+s 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 slide forwa1j7: fnt7 v+6rlqtdrfh8 l6kjrd into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It iepy-y0 z arth7r-g zs.(h+ix 5s 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 stoi7-(+0zty5h re-sraz ghy.x p pping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m ip5fozxew58,az + c0r = 0.40 kg, what is the magnitude of the acceleration of the system? (Igz 50rew i+xfzop5ca,8nore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m h)x+lq/ozz9q c yyf)+w6 wt.w = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of t) .fhyq)y6xo+wtz/qw +c z lw9he pulley.)

  A student pulls a box of books on a smooth horizontal floor with a fojvw g dv8)2k28t i4v1 jxsecb+rce of 100 N j8v2wkt) c2b4dxs e1 jvg8+viin 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 books on a smooth horizontal floor with 5e)w1e.oc 4npl m6diwa force of 100 N i c.ln146em wd p5io)wen 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 force on the box?

  A traffic light of weight 100 N is supported by two ropes j+56s,nckat p ; g(a2zrx5ptjas shown in Fig. 4-2. What are the tensit +,;rp5x(j2zpcgsat n 5kja 6ons in the ropes?

  In Fig. 4-2, if the tensioemt f -vd6wab eu*2sj:zm fhk xh82(-:ns in the ropes are 50 N, what is the mass of the traffic8 jmkd-aw:*exme z h26f ft:(2-vbhus light?

  Two boxes of masses m and 2m are in contact with eacucwq+ 1 z06 / 10qrog,l6q72o7bzb athlphivuh other on a frictionless surface. (See Fig. 4-3.) What is the acceg1,u2 oaip7tz0 b6vrh 1qoqwb6c u+ h7l0q lz/leration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on agnfmt dun721 qlnjf3:w9; e7j xjl99t +yeo,g frictionless surface. (See Fig. 4-3.) What is the net force on the more g13 en9g9nxjl n:j fm 7e,9ttdyo2f+ ;ul7qwjmassive box?

  Two boxes of masses m and 2m are cotp apgpw-u6 n,qm1q0 7nnected by a rope. (See Fig. 4-4.) If the forward forc1mgw, n6atq0p-7 pp uqe on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are cxtszx4n kqb.xbh 0a9zw26l;/ onnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration 96tn .axbbx4q2 kl;z x/ 0whzsof the less massive box?

Two boxes are connected by a co)eo6dxu5hxs l1ry,sqd, 0h j2rd running over a pulley as shown in Fig. 4-5. Box I of ma, 2oehdsq) sxxduh0yj1 l6 5,rss
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 c5 a +oaonnh.cr-h7y. between a 3.0-kg box and a desk are 0.40 and 0.30, respec oynhach +nor-a.5.7ctively. 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 0.593gyy, yq ,2aabylvyjg5v3 h3 0 and 0.yb,v3yyg y 23av 3 qhajg,5y9l40,
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.losd0)(o+c1;qz spzn It slows and comes to a stoplozqpz0 sd1s )n;(+c o 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 horizontaksi/ :ih+b0ev q/z2d8dl kon2l surface is pulled by a 5.0-N force. A 3.0-N friction forcehkeq izv n/:kl 08s+i2/bdo d2 retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-k4 t-xty,/ok jd7+t+- hf eskrlg 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 initia :;e*cfzs+ srj tskfm xjy((-2l speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the jf m(xsztf;*rs(e yk-: jc2s+ puck and the ice?

  During the investigation of a traffic accident, police find ;qb/kyj4.ff4 q;jat jskid marks 90.0 m long. They determine the coefficient of friction betjj b/; qf qtfay4;k4.jween the car's tires 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 are stacked. (See Fig. 4-6.) The su l1w x80r2mjl 1uqbtw,rface 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 frictionm lw2u08j lrx,qw1bt1 force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. jh*b k:x(epes.g7e8f 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, w:7he*kexj(p8 beg. fshat is the coefficient of static friction between the boxes?

  An object is on a frictionlesssqxy)y96ij9mdt3un/: ts h( o inclined plane. The plane is inclined at an angle on9xho jyq):ms3t/ y u96ts id(f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dqm9 t2c9: 5epgbhi zv77k(axpown 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 f8pig25xx(rcbzlg0 9 / jq ad-$37^{\circ}$ 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 tilh yd53e9o43y wc ctwo-ted 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 inch/3 .to* jorzclined plane, at a constant velocity of 6.0o.zohc* r3j /t 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 g(6 ye ptpc8 33dvs;wuxipq 50a 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 ryhfj u:vt p+5w7g0d0a:2sqfd /imr 9gough $37^{\circ}$ 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 cov4-u8voyv l1zbg 11b i 0em:pable attached to the log makes an angle1yvmp1 ib b8voev4gz0l-u o:1 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 releaset 8t4:z3tlab** gwi9t7h5joa imu: gj d from rest on a rough inclined plane tilted at an anglelij5:t a*g 3j*: g8bhio4tma9w tuzt 7 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 akj:eqzcypdwtk6t/ 29y (- vp)ngle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of:t d9 yy/pqv6z2ec )-j (pkkwt static friction between the object and the plane?