Which of Newton's laws best exp6vav- g.ax :-+ ram*jnzxp.cblains why motorists should buckle-up?

  When you sit on a chair, the resultant forepvm:b96j+t 8e mq lb3ce on you is

  In the absence of an exterg:qtu j13p+ w4ys ah:dnal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned366aaqku fh )di) xtjya3d01u off, while traveling in empty sp 1iu)j03 yqd6ut6a 3xdakfah) ace, the starship will

  A rocket moves through empty spacvlnz6w4d/2q 7y 9r:)w lcex0)ftz cqve in a straight line with constant speed. 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 sustain its motiond4wqr:)vqzwfen0z7v6/cy9x 2t l)l c is

  You are standing in a moving bus,7obf n . pd/c0 z3rl56tw;pv. z+lqwqg facing forward, and you suddenly fall forward. p+o lbtpl5g0v7 r63wc q.d qfwnz;.z/You can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you y h.4w8kedk :rsuddenly fall forward as the bus comes to an immediate stop. What force caused you tor 4ky8ekhd.: w fall forward?

  A constant net force acts on an object. Describe the motion of nrhfsap:qc:o :2xrq..v5 vq ; the object.

  The acceleration of an object is inversely p)e+rjk5x3 a,,m mga,ehbbbt 6 roportional to

  A net force F accelerates a mass m with an acceleration a. If the same netrmv8 00gey.1qlzza +h zfdq1 3/a9bmc force is applied to mass 2m, then thc bld+aazm8 gq.r1 zh0/vmy1feq 39z0e acceleration will be

  A net force F acts on a mass m and produces an acceleration a.;;m(rjr hue/4x-k:u enn4oxx What acceleration results if a e-(;o4m4n/uer:jnxux ;h krx net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the badt./5 y7l eu5j :8xx hzv8taa )l4qwialloon will fly away. This is y :xqi e487.jatw v5z8a u )t/alxh5ldan illustration of

  Two cars collide head-on. At every moment during the collision, theuxixj5c3+rul5 rilyo 7+ :byod01w5p magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force theyxu5wcplx 3u 0 i5ridylr+57b1 :+ ooj second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which t yyk+er1 o4ej+he object exerts on you wiekjyyr +e+41oll

  Action-reaction forc x 4j94 wm0 7k/emmspyddu(wj+es

  Action-reaction forces ar.dme5rs:cil3e(2j hse

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to aq5 i2;z gfbm3the car. Sbq5z 2am; ig3fince a lot of damage is done on the car

  An object of mass m sits on a flat table. Th2e;uv 3ea3 e9zbonez+j n/a1we Earth pulls on this object with force mg, which we will call the action force. 9az ; +2 313b/anzoeweunjvee What is the reaction force?

  A child's toy is suspended from the ceiling by means of a szr0xk soebv676 ;6gt etring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what r zoekg0 xs7e66;b6vt is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instm4k i/zvs25p3.vapx ki f)f:p antaneous force. The bavifpp.f /vza)52x4i kk3 ps:mll hits the bat with an instantaneous force, whose magnitude is

State Newton's three lawsn. tkwq*u e*n8.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on E9/w n l6ogjc fo7h*2cuq0jfb)arth. Which of the foll*ghwqj f b7co/oj9) 26fulcn0owing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at j 6u k3re;f)wsmerz 28a distance is

  Who has a greater weight to maalfho,iss z *6,8ax8t ss ratio, a person weighing 400 N or a person weighing xs8la,6 , *taizhso 8f600 N?

  A stone is thrown straight up. At the top of its path, the net force acting on 26bhv ew++z):bu9- zozl hxblh9vozbw lz-z+b2) lh b+eu :6xit is

  A 20-N weight and a 5.0-N weight are dropped simul;.fut nogmh)f +nx4w+hbrh l:4z9x4 wtaneously from the same height. Ignore air resistance. Compare their r4wn:f)x g9+wtu ohz 4h l4m;fn+x.bhaccelerations.

  A brick and a feather fall to the ear phkk()9s3na xth at their respective terminal velocities. Which object experiences the greater force of air fricti9(p)xas nk h3kon?

  An object of mass m is hanging by a string ,:7* v,wio(dfrbqmtq1ae shx1u;7qh from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in t itewb ,qaosq;ux:hrm11(f *d,hq v7 7he string?

  An object of mass m is hanging by a string from eflf3 ,k ar :mb(sc8poxn- 6(fthe ceiling of an elevator. The elevator is moving u3 afnp-l,8coxrfs(b :k e6 mf(pward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk dru r4u)s(4g h-)yz q*n)ajao is

  It's more difficult to start moving a heavy carton fro )hy2e1anp94(c+ ;hked4ah:jw z aqqem rest than it is to keep pushing it with cons we de4 ;4 zahcy(a+)219:neqhhjqapktant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fricdr0b90dm, c lrbwf2 3o-1i t fzu/xxa7tion isu7/to,a 3wb2c-xfx rr0 di0 1dfblm9 z present) 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 velocity. Thus we c2dky m(a 3, c1xh:muwzan deduc ,2maum3 (1:dwchzyxke that

  A block of mass M slides down a frictionless plane inclined at anztvnavt 1o3bjpw /4/l:1llq 6 angle q with the horizontal. The normal reaction force exerted qo1 t63v1vllpab/wltj/:nz 4 by the plane on the block is

  A block of mass M slides down a frictionless plane inc /mcomkvrk)7-lined at an angle q with the horizontal. The normal reaction forcekvc/-k7mro )m exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at ao w1-6btqn04tnbaxo l,u -e59pnwe )ln angle q with the horizontal. The gral4e- 1bt6t 9bnnq u-wl,x0 ew)npo5oavitational force is directed

  Two toy cars (16 kg and 2.0 kg) are r*m* iu 4,udcbjeleased simultaneously on an inclined plane that i*u,u*4cj dmb makes 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 to the objg:3q 4o h.s)5duuk.,no ek2 mm:nvotyect, and it accelerates at kqvo ohn) :.guty o5smd.4k ue:m2,3n$2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 10yb4 p8ha. gi,s00 kg can accelerate from rest to 27 m/s in 7.0 s. What is tbyi4,asp8. gh he average forward force on the car?

  Starting from rest, a 3 gj( n7meo9wn4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting ng(o7 9je wm3non the body?

  An antitank weapon fires a 3.00-kg roi09xp afk9 r1ocket which acquires a speed of 50.0 m/s aftep oi9kr1 fx0a9r 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 wi(z cd7f+6eo uzein1u3th the same force that you push a 10-kg mass from res7( e3oi6ucfzze1un+ dt,

  What is the mass of a person w.l3hxz-z1 dt g.mvz 7jho weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of th.+yhi,mu q8l4e/b seze Earth where the acceleration due to gravity imlq8beis, +z/u yhe4. s $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass p v *id);sfis(of the object on the surface of the Moon where thes(;f i)*dp ivs acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and ob(6vg/sdku i7nject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare thengvk s/iud7(6 masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite+lsbkl(:o 6zdm0,*lg 1gxwtpuzt9( plp8s 4 j ends of a 5.0-kg rope. Sue pulls p(x sdps9 *lt w6zg b18lk,gzo: 0(u llmt4+pjwith 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 level frictionless su7 wzs *1wtfqk5rface. A force F acts on the st57wzws* kftq1 ack, 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 elevat6c**zmy(r:tu9r e7 1 gqlq 6vfam jkd*or. What will the scale be reading when the elevator is accelerating d gk6cam6f qz917ue:l rq(*rd**tm yjv ownward at $4.00 \; m/s^2$?

  A person on a scale rides in an euria),mcfz y8 o:x xmqvq8a4y92 i*op4odv19levator. If the mass of the person is 60.0 kg and the elevator accelerates dm4q ypox:f2oo8)v*uy ac,im zrai8941x 9d vqownward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridlp*jttnud *.84hr 6iies in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward wittdn j6u*i*l8h i.4tpr h 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 a magnitude ofelbaf: -jl0di9xe/3 (pyvcs+ 8.0 N and is directed due north. The svd-/xl(:ca+ i eye903jb flspecond force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rest9 ff nezmw*)6zs on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 Nzzmf96*)enw f. 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 ayk -rrxo,r93rests on the flatbed of a truck. It is held in place by metal brackets that can exe, a-rk9yx3r rort 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0 l7fnk);fvbk +.40 kg, what is the magnitude of the accf)l +kk; bfvn7eleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60t ck4ji:b:fyz 94,a35: a4dmqj mleoa kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass offyob3ze j:44 5ktj::9m d aaq4imlac, the pulley.)

  A student pulls a box of books on a smooth horizontal flojcbohyiz)* r *)z+u o6or with a force of 100 N in a dirhr+b o6)z zy* )u*oicjection 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 hor1 h6 dihd(fq8hizontal floor with a force of 100 N in a q hhd18fh( 6iddirection 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 as shown in Fig. 4-2. ,, dqc xqb*hm+ mjg/o0w(7twm Wham,x gt(hc ,*wd 7/obwqq j+0mmt are the tensions in the ropes?

  In Fig. 4-2, if the tensions i(5ac6 )mqvl:y qamw bwc)c8 :nn the ropes are 50 N, what is the mass of the traffn6ym :w)qlw cav5:)a(qb8cmcic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless (go6rz n,cix4(,8ssycs mx q)surface. (See Fig. 4-3.) What is the acceleration of thcqi,x8(sy zm) g oc s,s4(r6nxe more massive box?

  Two boxes of masses m and 2hlxb-mgu0 )(+n gkbva1+k f h9m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more h-9bkgnm0+)g1l(fvab k hx+umassive box?

  Two boxes of masses m and 2m are conneq0q1f;3zkv l3yu6hz wcted by a rope. (See Fig. 4-4.) If the forward force on the more quf 16 z3z3;v0qlhwyk massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are conn *mi1iwy paw((ected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massivei*awi(1pw ym ( box?

Two boxes are connected by a cord 2gkpl3 g;-jc vrunning over a pulley as shown in Fig. 4-5. Box Iklpg;2jv 3c -g 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 frictionf- /gbn3 0,w9ugrpg.l vf4gmos between a 3.0-kg box and a desk are 0.40 and 0.30, respelw,0r-uno p g3/vmf.gg 94 gfbctively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and ki1 ,f s7oaly2; v3(8 pknidwjgznetic frictions for plastic on wood are 0.50 and 07viog;wd2 1jkps3n8,l f( yza.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 zm*n4 3ptz+hj +x direction. It slows and comes to a stop with ztz*mp3+jh n4a 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 horizontal surface is pulled by a.8x1o9.5bwo6rlpmkao ;se hxs, r ta1 5.0-N force. A 3.0-N friction force re .a5r1o;lw t. 1,8ampsr eo h9bx6oxkstards the motion. What is the acceleration of the object?

  A horizontal force of 5x.4rb.eiin g -.0 N accelerates 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 h9ap/7 kz8 llbpuck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the c/kb p8llahz97 oefficient of kinetic friction between the puck and the ice?

  During the investigation of a trafff7 sbi xeh gst6 d.zz02( p1g,yh2gmn:ic accident, police find skid marks 90.0 m long. They determine the coefficient h gyh1.s27n2tg,xi f(em zgz:sp d0b6of friction between 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 surfat5* ,oi;mk *qyfukq m1ce between the more massivek*o1 *tui5kqq y; fmm, 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 force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Thevs0 km500 frbs 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 nos0 v m0sr0fk5bt slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless incl:xraid(0x 4c (fe1 kl9qiz,o;qt jt/jined plane. The plane is inclined at an angle of; aqtr0d i(j z,9xtx:(lqc41 fki/j eo $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an ah1bzrrg5e29 .o c cne 5hqh-(:s1hdqrngle 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 anyx:wcsk- ;(4w kcu7j l 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 tilt36rxj l2 l8fswed 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 incline-v(odbwa ydk(o2 *nz( d plane, at a constant velocity of 6ynavk(dwb *d- z((oo2.0 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 exp 9 k7de+xbm,rn(mnzu c,,,m slides 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 slidesgoa3w40kt /yc fp;ww -ug57w17kq0nzf/smeo 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 attachsp:pnzns8 ,2t (kbag/ f eoc()ed to the log makes an angle o2tn8oek a(cpsnf:( /)zp,s gb f $30.0^{\circ}$ 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 iny3w5 n+k8bb oiwx :a)nclined plane tilted at an angle of ai) xnb3bo5k8 +y:nww $33.5^{\circ}$ 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 plas8 8zgn eqk6wb8i+9p wne. The angle of incline is gradually increased until the object bs e8gzpk6b nq8i 9w+8wegins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?