Which of Newton's laws best p o1joajky7i3 l12)mdv,qe:b j ni .i;explains why motorists should buckle-up?

  When you sit on a chair, the rgsyu0715z bz /k.nk /qdf.3i0qstw spesultant force on you is

  In the absence of an exter 45st v3pxvgq0ptls 0;nal force, a moving object will

  When the rocket engines on the starship NO-Pxhes9 tw68cv9AIN-NO-GAIN are suddenly turned off, while traveli 99x stv8ewh6cng in empty space, the starship will

  A rocket moves through empty spa*ljdp-b ,m 9h oy5kj2y7xmu5cce in a straight line with constant speed. It is far from the gravitational effect jlxm5* y2m,o d5jybph 9-k7 cuof 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; uzu2fbc wx9(, facing forward, and you suddenly fall forward. You can imply from tu fu 9(xwb2;czhis that the bus's

  You are standing in a moving bus,+j5h xs,fuv. eb4j /odhj43ze facing forward, and you suddenly fall forward as the bus comes tosjh b5od3,jh.e 4/je4uzf+xv an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the m x uuajj3mh) c;.;p,glxd0p9ootion of the object.

  The acceleration of an object is inversely proportionaldbzh; t*s. 4j+miv(kw to

  A net force F accelerates a mass m witi 9t-eynsd,q kge+(5c h an acceleration a. If the same net force is applied to mass 2m, then the acceleration wgeik5 ,-qct 9s edy+(nill be

  A net force F acts on a ma.u, c/nr yjwb;ss m and produces an acceleration a. What acceleration results ybn.jcr;w ,u/if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Tho60 ihgslb))+i/i ch dis is an illustratl)ig i/c hodi6sh0+b)ion of

  Two cars collide head-on. At every moment during the collision, the magnitud5rjsk+wa:hyu 28 kq d2e of the force the first car exerts on the second is exactly equal to the magnitude of the force the secojq+ dk2swh uyk:r5a28nd car exerts on the first. This is an example of

  If you exert a force F on an object, the fomfgt1f u;1lku0lq-v5rce which the object exerts on you will1ug fk l-m5ftv 1l0u;q

  Action-reaction forcesj9 yzcf:*e sr*

  Action-reaction forcfmm9 )9 ;fbvzues are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to th-aljsd8q gn-.e car. Since a lot of damage inq g-j.8da-s ls done on the car

  An object of mass m sits on a flat table. The Earth pullsiftj3), :yyx6 *0yvp8: xw prg;xcnj i on this object with forc8ppvx* : jfynxictyj0gi:6w 3;)r,xy e 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 a string. The Earth 7 nzj t9)ga.j6ah) ) fhy-szytpulls downward on the toy with its weight forzt)hj asz -jytyf.)a67)h9 g nce 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 e)x/ f7qn,vp0jcgm )i instantaneous force. The ball hits the bat with an instantaneous force, whose magnitudegv i,mj q7/f ))xnpc0e is

State Newton's three laws.q) hm8 rzv*+dg

  Mass and weight

  The acceleration due to gravity inrb+ 7 y;fe)lns lower on the Moon than on Earth. Which of the following is tru)fn ;ynlbr7 e+e about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a d xjvkjf;26lls5k nx) :istance is

  Who has a greater weigazs2we7u3nq)le. xolb-r (u/ ht to mass ratio, a person weighing 400 N or a person weig x.uzae /n2wqls(l7 o)3rb-e uhing 600 N?

  A stone is thrown straight up. At the top of its path, the net force ac0: w1xi e7:xu cmv(s,4g*a9 h qffoxzkting on it isx,*cqo01vkmu:4swgxe:a i zffhx 7(9

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the su:4t*hauw q i.u67 x1 hasb2msame height. Ignore air resistance. Compare their accelet.um67 huab4aqs sxuw 1:hi2*rations.

  A brick and a feather fall to the earth at their respective t 5d5e5vrm lx nt08x.jrerminal velocities. Which object experiences the greater force of air friction 0nlvr.jd5et r85 xm5x?

  An object of mass m is hanging by a string from the ceiling xlb4xyqg2jbt8xh.)k z;z)j 2of an elevator. The elevator is moving up at constant speed. What is the t;2 .q bxjz 8xkl)zx h42bj)gytension in the string?

  An object of mass m is hanging by a string frop+gwr+ e(dx),b wrk u)m the ceiling of an elevator. The elevator is moving upward, buw(b ,+r)uwrkeg+)xdp t slowing down. What is the tension in the string?

  The force that keeps you frorf 7pzoley.4 5m sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than i+i*v cpvqcuh x 9.b o2jyj/15vt is to keep pushing it with constant velocity, becap jb.ciy/9vv*1xjcqv +oh25uuse

  A horizontal force accelerates a box from rest acroqmdd:e.sp 2;o5)av lg izk5o 0e,mhg -ss a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception p:km.25aiv d-eqmo 0 )zgo,g5he;sldthat the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an /zed8qkk2fg2r+uh cj u) e j cahi25+)inclined ramp at constant velocity. Thus we can deduce thackafqh r/ujuej5 ked2+2g2)+)c 8ih zt

  A block of mass M slides down a frictionless plane inclined at an m,4x.ysha(xe ipko+,angle q with the horizontal. T ,,ysmxh 4xai+ep o(.khe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a wf+wu6k 5yevr.x6y5wfrictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block iyw er wky+vw6. 6xuf55s directed

  A block of mass M slides down a frictionless plane inclined at an angle q withhwg5i5sf *y:8 qy9ci v the horizontal. The gravitational force hqgi9fc*5 wi s 8v5y:yis directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an j:z.cn ,o-i1sovz/ot inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their ac nz 1s.o/tz:,ooc -ivjceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to t7y y)y d2 0yppb/ek0cphe object, and itpdpy0y ypb0 /)ye2ck7 accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of massu9+ 0/wvqjcyk9 0rbv p 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car ubp/jwkc9 90yvqrv0+?

  Starting from rest, a 4wok6:fx evqh374aggam wv.a90dev 9( .0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acek4dgwv3.w 7h:99(eax qa0m vf6av goting on the body?

  An antitank weapon fires a 3.00-kg rocket whicjzncv 5)ohk6 :ol ,tg ;g(po)xh acquires a speed of 50.0 m/s after tr np: t6,vokcogjl5)x ; (ohgz)aveling
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 samgol8urmpi -5f;4 i4i ee force that you push a 10-kg mass from re;o4p i-ie4 g um8il5frst,

  What is the mass of a2a9eb8ywqfme m:8rt1 8pov u0 person who weighs 110 lb?

  What is the mass of r,dvxz9 .ktx sn 1w-i(an object that weighs 250 N on the surface of the Earth wherezsd1 x(,r-xk tnvi9. w the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What ibr/ord(oxhb,yf-h*-x ;,r kxi48pm os the mass of the object on the surface of-rb,y4d*x(xrh m h/,- p8;o fkoxobri the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, iwiu y7 x(sh(b(8g, ay7kdu*zfzfm;9and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compg hazb uf7ys((w i,kd7ui*m8;f( z y9xare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a o8 fmmg1d8 3:qeakzn6 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at 8m aoez:63n8mgfdkq1$2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force - +pxpyzu4d41zk*2 zon fa8nls*;zpy F acts on the stack, and it a4pdp*+ lz1ynfx 4oknzzu- *s;py8 2z 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. Whatt:j tq/ 7)vjmo will the scale be reading when the elevator is accelerating do:om jq7tt/ v)jwnward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 kg y(-z5krigljtty q90,d f kg0.pem;y1 and the elevator accelerates downward with an acc,j0lt(9kf -zm.r5 01tygei;yk qdypg eleration 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 )o 4dkrqjd,0xrh+ mdqtf u.: mfr-a-h(9 ou1p of the person is 60.0 kg and the elevator accelerates up.rf qrmq)kup91t da- o f+:( xdd,uj4mo- 0hhrward 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 l6w: q5 rm .;ngu b/od:8lcquka magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitud /uq8llk5roumq :;g n6 dw.b:ce of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is hx7 -+ ht:sisc0rkd *wteld in place by metal bractx rt+0ckw ds: 7-ih*skets 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.,*qyz 8zpbf9 y)we)hbuu-4 ,n2ai mkb It is held in place by metal brackets that can exert azwyu bh2kb8,4fa yp)be* m- qin 9z)u, 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and 9gjjzo pu08e/a u93tbm = 0.40 kg, what is the magnitude of the acceleration o/3ez8gbta 9pjuu 9j o0f the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown inp- 7i5tk0i qjro,gs -nmywiaxe9yhj 2n,7,3k Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the puljpjwyqa 92 o y-s0r77em k,i5higi-txn3 ,,n kley.)

  A student pulls a box of books on a smooth horizontal floor with a force of 16sjr9sr7cp,0 x7k h- fpt)wxt00 N in a )sx97-cr7ph,6fwt rx skjtp 0direction 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 horizontalmji3j qu6r-:uik* -id* a 6pld 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 iju6iril d:3p a*-ijm6dku* q -s 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N ijsg/e42+d c xhs supported by two ropes as shown in Fig. 4-2. What are the tensic+xd2 ej/s 4ghons in the ropes?

  In Fig. 4-2, if the tensions in the ropes1uth ,c: pzyv/bm(w s9 are 50 N, what is the mass of the traffic light?h(szp:9tmv/ y w ,1bcu

  Two boxes of masses m and 2m are in contact w ,z5t ie i1+a76oa f71b,yne(tbotpflith each other on a frictionless surface. (See Fl+zb 1 fp7oab tfty7eo5e,,1ait n6i (ig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesff:ani6pzo rqa bz9hg8/;56ks surf69:hpo fzz anrg6bif k;8qa 5/ace. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m b1b-a8 r(afd vand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the t(r8a bbav d-f1ension in the connecting rope?

  Two boxes of masses m and 2m are connectehp2 8e2i cbn:od by a rope. (See Fig. 4-4.) If the forward force on the more massi:b2 hic2eopn 8ve box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord rue9z3ik 9sfp+/ik :u3o, t kmfdnning over a pulley as shown in Fig. 4-5. Box I omu/sk3ifkd9 e3 izo t+ k:p9,ff 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 betweep ni *q9khjg28n 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 fikphqg n2* 89jorce is applied to the box?

  The coefficients of static and kinetic frictions for plasti wtvtf,r jo6/o), j6ogc on wood are 0.50 anttjwof)o/ jo ,vg66r,d 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 level surface in the +x direction. It slows 9 nefgoz t43)xand comes to a stop with a constatz9 fn3)4gxeont 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 by a 5.0-N force. 9:c7rum*bk-a7wckx e A 3.0-N friction fokk:ca9mec *-77 wur xbrce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg masutf ;+qu vi.v 5 f/x*wlyc4j/js, 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 spe8j 35 .g.i+uysi jnom 01b; b fp3xy)bb5ryntced of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck a bup i.;yf5yix3bm .r8b yso0nj 3)c+j5tng 1bnd the ice?

  During the investigation of a traffic accident, polisoo*4+ mnu i(b.ht2f ice 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 f2b 4niu.*i hsof+(to mor the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and r 9a n5ri5vt7 5wrve75c /vmdy3m 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 sli v av5miy5/d7nr5 rw9erv5 t7cde 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. (Sec +22cjax7 pcce Fig. 4-6.) The surface between the more massive box and the horizontal surface is sm2x7jcp2cc c+aooth 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 p+*l3nc- fl hchlane. The plane is inclined at an angl-3+hf c*ll nhce of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that9nbxk4 ):v9peu8t xbp 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 ang8 yvje*v 7*dp0qa wub2le 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 smoozo :sne qnjsx:crn v*+ h/rjub+t6:6;th 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 slidesock8y tn48a m) directly down an inclined plane, at a constant velocity of 6.0 8omtkn4yc a)8 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 slsyg0qd -xh0qp:-c 7gt)ae 5yy ides 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 sliderm t 29hv5ed5ds 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 ))nsgqyshdni78(a2d ia4.id. The cable attacheah.)(ds)dn iig s 8ady27i4 nqd to the log 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 re*dw)3nalei c; j. p4 *+fhimwkst on a rough inclined plane tilted at an angle ocf he+4j3miad inlkwp).**w ;f $33.5^{\circ}$ 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 grazo iq;ba8v/vhkj z fh7ee214 .kd5 gq(dually increaskie7 fh1 g.jkz dv4;zv(52o 8abeqqh/ed until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?