Which of Newton's laws best explains w;1l m)4le)ic9egz teghy motorists should buckle-up?

  When you sit on a chair, the resultant force kd, i/b*: tsv1reog**fqky0don you is

  In the absence of an external force, a movinnw +yh/pi,tl :g object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlyil7 9,gxe tnm6 turned off, while travelx,6eg t9im 7nling in empty space, the starship will

  A rocket moves through empty space in a straight line withuv t,9brwp8q5 constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force,tp9w ur5bq v8 that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwgyp sk46:a av:fo/:)tvqly 0pard, and you suddenly fall forward.y 4qat6 :f)p0ag o/v :yk:lsvp You can imply from this that the bus's

  You are standing in a movm. / tbi,cq9w0b0ydr ging bus, facing forward, and you suddenly fall forward as the t d/myrwqbc,gb900. i bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an objectc8j.c1 0yty6 yb.ls gr. Describe the motion of the object.

  The acceleration of an obd e) hvf.wens*:ws/:k ject is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. Ifo fqaow(ib *m9fvq2a6,7e4 1kkoi *ex the same net force i6*oi o av*q 7f,amfq4o9b wei( 2xe1kks applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleratidq37qm-9mbyg ;k5 t sion a. What acceleration results if a net force 2F acts osmd kq7 qb ;g3m-ty59in mass 4m?

  If you blow up a balloon, and then release it)alp77 6+ u(rwp ;)bopclfozs r:f kt;, the balloon will fly away. This is afol;r 6bo7+ slt k c(rz )fppa)7:;pwun illustration of

  Two cars collide head-on. At every moment during the collision, the magnip8apnpb ) t)9;fpx 9w5 iff-qd()udvytude 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. This is)x d(qfpndtp5y)pv ifa 8;b9f )pu-w9 an example of

  If you exert a force F on an object, the force which the oakh(o nep* 2+-boid,wbject exerts on you willhp,2n ek*- +o ibdw(oa

  Action-reaction forcq -;k(ls xr*hipkqi. 3es

  Action-reaction forces0dd2*0g(q4kn 5zyeyacope d . are

  A 20-ton truck collides with a 1500-lb car any arg ;8z x(xxj(4x,gd tbr.9hd causes a lot of damage to the car. Since a lxxdarxrx(8t 9y,jhg4b.; g( zot of damage is done on the car

  An object of mass m sits on a flat u:(8wre)of g9tjxa5dyg u//etable. The Earth pulls on this object with force mg, which we will call the action foe g/u 58ga9ewuydjx r/(:otf )rce. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string.mi6:.tbet 8r -ufgks1 v9izy3tw)n-w The Earth pulls downward on the toyn3 m86y e.wtfrvgi9t )i ut kw:1sz--b with 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 wi:.y,yly b5:xqe g k9j,5t7ex-kcjyh0oitf n+th a 1500-N instantaneous force. The ball hijy.y y teckiefhq+-7tkjy x,5b:,o:5 g 9nlx 0ts the bat with an instantaneous force, whose magnitude is

State Newton's three lawg3v+tx/r jpxw-x. wk )s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on * nz1 ug04gpcuEarth. Which of the following is truu14npg cu*g0ze 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 distance iye *h c+u3g:romw y40as

  Who has a greater weight to mass ratio, a person weighing 40azs0 o4ac 9 .)hxuwg(x0 N or a person weighihwsg)9a. c (xuzo4ax0ng 600 N?

  A stone is thrown straight up. At the top of i6io6qa2eoe 5 zts path, the net force acting on it z6 ao2eio5 6eqis

  A 20-N weight and a 5.0-N weight are dropped simultaneously byl*o)7k4* er :yiqc ofrom the same height. Ignore air resistance. Compare b:k7yc iyq*)*o4o reltheir accelerations.

  A brick and a feather fall to the earth at th22+qx / punndjeir respective terminal velocities. Which object experiences t2+x pjdn/unq2he greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. *chj3 c1-,y1wcg sn+ c62tcy (ewagb k The elevator is moving upt b+1w(632wn ac,-heg g1kcc cyc*js y at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string wyu n g.7y* i36rhfon5from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in tg u*w3on y6ny.i7f5r hhe string?

  The force that keeps you from sliding on an icy sidewalky 5wt922rhylsq 6 -zny is

  It's more difficult to stak1v lt t/;-lu )hgm 99uigy7xprt moving a heavy carton from rest than it is to keep pushing i/7 ;pul9xym utihvt9g )1lk g-t with constant velocity, because

  A horizontal force accelerate)krrcr c.rqh n*d s2 k2t7+6ors a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain 2 drr+q)o.2cn*7rr h srk6kc tthe 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 ven )nvo0,58sp p1rih vklocity. Thus we can deduce th v0pknhv5r8po ns,)i1at

  A block of mass M slides down a frictionless plane,k6.sbx s2 pqsd lu5.p inclined at an angle q with the horizontal. The qud6.kls5. x,ssp pb2normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane */)vy9tq bro ainclined at an angle q with the horizontal. The normal reaction force exerted by the plv t b*yaqr/9o)ane on the block is directed

  A block of mass M slides down a frictionless ple-t)jy/b n p:fane inclined at an angle q with the horizontal. The gravitaty)e p/ nbtf-:jional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on pj 8h3a f82sbi ved-i+an inclined plane that makes an angle of 30e with the horizontal. Make a stateahj3 efp8+8iib2 sdv -ment which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the ovg k2z 6n 8hna7ror;f(bject, and it accelhf rzn (v ;a7r2n6ok8gerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 px9ta3*q lqph x(k6.gs. What is the average forward force on the car?(*xql96qht xpakp3.g

  Starting from rest, a 4.0-kg body rb8t*p*a9 km6ac s9j qu,kvu5u eaches a speed of 8.0 m/s in 2.0 s. What is the net force actinm8st9*aua6 *5k vpubcqu9,j k g on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 f 2k:jf+j,e umj:9cvm m/s after traveli:fmf: j ec j2uj,+9kmvng
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 w ,.a yp5de2x.giekod, n g5la(ith the same force that you push a 10-kg mass from re 5.dgd,.(g2k5 ,e ipayaxonelst,

  What is the mass of a dzi ztx7-3ds4 person who weighs 110 lb?

  What is the mass of an stzp /tk;2 9t8z0sp)v j,slpo object that weighs 250 N on the surface of the Earth where thpkj,)sp8s ;ptlt 0t/zo v2sz 9e acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is2; rjbbghq9k,i ++j4ydzx0c t the mass of the object on the surface of c+jb jtr02zqbh+i ,;d9y xg 4kthe Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. Theq:gxi13k pg2k dp 8axju5 wkbsu4..j0 Moon's gravity is one sixth of Earth's. Compare the masses of the objec25:jg8kji. d30quw.bxpuska g kp1 4x ts.

  Sue and Sean are having a tug-of-war by p*p-e(nym+2 +eiumg(8s fm u- *jdgwv rulling on opposite ends of a 5.0-kg rope. Sue mdm * p(g(e-wju+rm*i+ysgn2fue8- v pulls 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 level frictionless surface t )yps dci/ )7cb1 xt*gt3 fl8la:kxs(6tf+zt. A force F acts on the stack, and it aa yktp(6ltcl/s1f7:c b*)3ttsxgt 8z f+d)xi ccelerates 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 5 cyp1tjw/z7x y lt:5m c,my.uan elevator. What will the scale be reading when the elevator is accelerating downward atj wlum myt7y./zcy 55ptc:1x, $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mash-m9m09 e*/d,dizfxagmrk r; s of the person is 60.0 kg and the elevator accelerates downward with an acceler-g,fier h9akm d *;9/mz 0mdxration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ru(ewg0eg gll6- 2 l8)rplw2htides in an elevator. If the mass of the person is 60.0 kg and the elevator er0)2le-(2hpgw tlll u68wggaccelerates 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. One force has a magnitude of 7w*tsn( n e8gl8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration g se(t7 8wln*nof the mass?

  An object of mass 6000 kg rests on the f a6 n,dy6k)nvtlatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. W6akd6 )t ,yvnnhen 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 kw2,;gu a wtgelg4 ot;.jk79g mbv29qqg 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 time if the load is not to slide forward into tbe9ukwg7. qq2g,o9aw jlt;2t4gvgm; he cab?

  In the Atwood machinerzmvgj.fdv;: i(/ :wu shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the accelejv.rui: f;g/v (wzd:mration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown ipbea:dw; 40p rn 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 t ba;pdr:w4e0 phe pulley.)

  A student pulls a box of book- b4 ba-loaum7pe9 2gus on a smooth horizontal floor with a force of 100 N in a da a-bp7429o ueg m-ulbirection 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 horizontanbb59 ngs8hd-u jr,5g l 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, what is the nor jgds b58gr-,uh9 nn5bmal force on the box?

  A traffic light of weight 100 N is supported by two ropes as hd o57xwa 4pw3shown in Fig. 4-2. What are the t5wdoax47p hw3ensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mas4yjthfuz la-w0 3;+c1p u;kp)* u lgbks of the traffic lu3ba+1-c*j;u)puy 4 h tllk ;zkgwp0 fight?

  Two boxes of masses m and 2m ajus:m;i(u rs5cc o2;are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of tho2u:;sa5;i sujm c(r ce more massive box?

  Two boxes of masses m and 2mp:5 basym (z n,;m-jgj are in contact with each other on a frictionless surfas n:;mj5 -bg(jy,pzmace. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. lm9 c5oky /x16nvtr a((See Fig. 4-4.) If the forward force on the more massive box is F, what is 59 kaxm nco6l(/tv 1yrthe tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See F mrey lvsx-em m.qsne29,. :s+ig. 4-4.) If the forward force on the more massive box is F, what is the acsmme2+ qe-9v:. rlmsse yn.,xceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown nbtb )k5/ltt 7vbg2k ,in Fig. 4-5. Box I tngt5bbkb,k ) 7/t lv2of 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 between a 3.0-kg box an4irfgq4un ( ;yd a desk are 0.40 and 0.30, respectively. What is the net force on the iu4n y ;rgf(4qbox when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50 ad-r4jug 3 3ib tqv/gubw2- ,zjnd 0.4u gt3 ,2wjg/-dzbjbqrv i-3u4 0,
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 to (0nomzk wlc, -9 ay1hgacz0,(-mkyg no 91h law stop 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 horizontal surface is pulled b7b t*9 x,7u/do gnoimz/jv5 b6 u.tkdq,uq0xqy a 5.0-N force. A 3.0-N friction f,v jxkb9,5o/7u qzd/ u i qotnq.*dumbg7x60torce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mdd mamb a8ug *us++t0/ass, 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 10rm j v3f4s5r,vahzf ;/6 nwr7w m/s. It slides 50 m on the ice before it stops. What is the coefficient of kineticwsfr 64 j v5r3afrv 7hwmn,z/; friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90r 4. j r.x,w9sjj/(wbp tghts/.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditio xwhj(4.sjs/wt r. tpbr,j/g 9ns. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m andvzil/d.u-/t *jky6h r 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 statd-rvyzj*l i/uh. kt 6/ic friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-fw3 yjzji(fo txr9gf,8a1) /o*cb /gj7pj c9j6.) 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 *p)fiz9xcjjj/ tg7y / (a,3 j r8wgjfc9ofb1ocoefficient of static friction between the boxes?

  An object is on a frizw0z yxo/)cg6hg c*k8hqb(t a* bmm:.ctionless inclined plane. The plane is inclined at an anglhcx ba h0(zo/6mg kmct8w*.b*qz : )yge of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that ,c ;6)txlwt rt5ba4 x/i)it yjmakes 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 a1d--aezyaehn.hmv97 f6ko 9o smooth inclined plane with an 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 an angle ofc uqx ++42 -ncfr b wk34x.vsj:n-zrhi $35^{\circ}$ 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 slide(an cjrp 6o4j8s directly down an inclined plane, at a constant velocity of 6.0 m/p6c (jj48 naros.
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/qti:, ji u4eg 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 rob o e*o2,fy fky72. xctmj;9qtugh $37^{\circ}$ 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-kd,a dj-udn 6 f,giz: attached to the log makes an angle oafd:k-dzin, g d 6j,-uf $30.0^{\circ}$ 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 tilted at an wv4y k3j7,d/ppg(-1uw oc kakangleku ka1 7 (wcy-gov/jpp3w,d k4 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 njx 0wr8j yx6a:.w :hpgradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficie6h0p x:8rayn w: jx.wjnt of static friction between the object and the plane?