Which of Newton's laws best explains g2fj.e6x1-not hm k6ry m6 og9why motorists should buckle-up?

  When you sit on a chair, the resultant fqr3 h2e.a(xay orce on you is

  In the absence of an external force,niaxl i+2 rug)rjj 0xfl/r4+( a moving object will

  When the rocket engines on 3co x0:s0du0wf),phwwypx x8the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in emhxwo 3xxdw 0pf:sc,pu08)y0wpty space, the starship will

  A rocket moves through empty space in a straight line wi kuhoq/4 ie-al8qn-/eqm5qk5 th constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force t inoeqkmlqa-5kq4uq8e // 5h-hat must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwar0kh31 ,ezlwm hr+wa)sd, and you suddenly fall forward. You 3m k0w 1lrah )wzs,e+hcan imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenlw0qz5 rwy b3a nw0 .tdn4rb:/uy fall forward as the bus comes to an immediate stop. What fn:a zb04wu.nw tb0d3q 5yrrw /orce caused you to fall forward?

  A constant net force acts on an object. Describe i v7v 5*.l7l s;uaawy8ruh7hqthe motion of the object.

  The acceleration of an object is invkt y sbxhn*6*5ersely proportional to

  A net force F accelerates a mass m with an rc)/- z+ctqway i)o )vacceleration a. If the same net force is applied to mass 2m, then the accelec)) c)+vrzio qa/ywt-ration will be

  A net force F acts on a mass m and produces an acceleration a. What accele v 3 x/n)f54lzdlxfm+vration results if a net force 2F acts on mass 4m?/v4l)mlfv+f 3x d5zn x

  If you blow up a balloon, and then release it, the balloon will fly away. gn ufk3jw:) 3si(p* ownd+xe 6 This is an illustration ofjnip:w x3du*g)f keo+3 n (w6s

  Two cars collide head-on. At vwe6v zg)ygx(zxos32fo1v 075 dm.c u every moment during the collision, the magnitude 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 f7 2d1v)oeyms (zuv063xv. ggcz5wxofirst. This is an example of

  If you exert a force F on an object, the force which the object exerts on 1u1jd bsg2iq,you wilbi u1j,qdg 2s1l

  Action-reaction forces5e98lt m(1b29r d ejk)lk )xzze/y olv

  Action-reaction forces a+j(owl+ g7yv0ww fs 7ere

  A 20-ton truck collides:j0 *4.-no-jaky9 ljwmx lnxc with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage ijw4njo*x 9-alkc-n y lmx. 0j:s done on the car

  An object of mass m sits on a flat table. The Earth p yxts 2gl.gsr.:m u:d;ulls on this object with forcx:sg. .ug:m 2 sdry;lte 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. Tss90 7zy,gvhg 99kbv hhe Earth pulls downwyh,k7s9sgb9 90v gzvh ard on the toy 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 with a 1:luaib/ lb1a ;500-N instantaneous force. The ball hits1biua l; /bl:a the bat with an instantaneous force, whose magnitude is

State Newton's three law,v,cp v.: r v3tx+cgqbs.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than964p/ x oks+sqjuz n3s3aq/ w6a5q(pmzvsse) on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, comparj/zsnws)qu( 3qs5o6pke/ x a s9sm3z+4q6pa ved to Earth?

  An example of a force which acts at a disvup 64 p *vwk)pz(3lbbtance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person w ;a;c-0rtw 5m g;bipfoeighing 600 ;ofrbwi;ca -5;pg t 0mN?

  A stone is thrown straight up. Ana;xn9m h us+8s))jp-o ug. bruyk5( ot the top of its path, the net force acting on -.b9g; saj(ms+8 nuuh proxoy)5 u)knit is

  A 20-N weight and a 5.0-N weighl9l2 c(2xudzg t are dropped simultaneously from the same height. Ignore air resistanxdg ul22cz l(9ce. Compare their accelerations.

  A brick and a feather fall to the earth atusw0(bxh g g-1 their respective terminal velocities. Which object experiencg-1sbg( xwh0ues the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. m xn z;l8wo(;(mpkk6v The elevator is moving up at constant speed. 6lmk(w moz( 8v kp;;xn What is the tension in the string?

  An object of mass m is hanging by a string ti).wb4 9q0gvobuwh;from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the t wo; uvb)bihq4 gw0.t9ension in the string?

  The force that keeps yojuup qi223on jx9 )zdc-: a7kcu from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carya2dgj ;7 6g /wmvgcg+-pu2l pton from rest than it is to keep pushing it withmgg apl-jg7g6/2 v;yd2w+pcu constant velocity, because

  A horizontal force accelerates a box from rest ace,dl uz;b b+vnvm*:c/ ross a horizontal surface (friction is present)bb ;,lu/e cn zm:+*dvv 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 col6 ,cof kwwx ;j:k56lonstant velocity. Thus we can w:xlwkc6 ;of,ok6 5jl deduce that

  A block of mass M slides down a frictionless p gw) phrdy+8i(lane inclined at an angle q with the+)dp hi8r(wyg horizontal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q oev6f k+1n.edz z0aldk+b7c 6with the horizontallce1a 6ndbo+. e0k fz7dzv6k+. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incliqcrx4-q *vv 9h1kno8x ned at an angle q with the horizontalq*v 8ohkr n-cvx9q14x. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inces)gs) krp8h9fwzznh cunb) 3 -6e0,dlined plane that makes an angle of 30e with the horizontal. Make a statement which best deg)nek9 hp nsf-60r)wh) ,8sb3uzczdescribes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the obo6j lkg. zxc u0kqdj;*v1ho 9/ject, and itlo*kzjkc/h x9oug60q1 ; vjd. accelerates 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 2husy*i:fu:t:kh; :e n 7 m/s in 7.0 s. What is the averi:te :s yhf:* uuk:nh;age forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/-rbg )0)il br-bnqm7.saik7b*mbm 4rs in 2.0 s. What is the net force acting on ar gml inkb)-bbm 0i)*mq-r.7rbb74s the body?

  An antitank weapon fires a 3.00-kg rou.tfhn*:c gf,5t9 qtc cket which acquires a speed of 50.0 m/s after trav9fhttc n. u,t* fg5cq:eling
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 with54,8 ls0d pp2xkcgqiy the same force that you push a 10-kg mass from re 50,yipkcdx8sl2gqp4 st,

  What is the mass of a perm kyw+n 55wc(y jwr3ek(j;jl;son who weighs 110 lb?

  What is the mass of an object that weighs 250 N-w2k x:lssk ,.mq)c.evnv2rt on the surface of the Earth where the accelera. km -:v xkv.22 qnesc)wtr,sltion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mas7n*1 y7md,a,xu c orzcxfb 0l+s of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 ou,x 0,7zblm7cr+ x *cnyf1od af that on the Earth?

  Object A weighs 40 N on Earth, and obje r.q.y(u , jrdf+a9dject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare theeajd9(,.r +ur fqdjy . masses of the objects.

  Sue and Sean are having a tug-odmmr (ptu)(br9d* p;wf-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's forc*)db;dr m(p(r 9wutpme if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on th.e j9g.qfg8she stafhq.sggj9 . e8ck, 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. Wh i0,cqnem/.jmq +a: bvat will the scale be readin/:m+qjeiv c 0m bq.a,ng when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If tup6 q; dv*gv0whe mass of the person is 60.0 kg and the elevator ac0 pdw 6*uvvqg;celerates 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 t7ec8 bz8 qfti. o3h-qyhe mass of the person is 60.0 kg and the elevatoi q t8-oc8 bf.zyeq73hr 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. One force has a magnitude of 86yqv xs hxw8;8.0 N and is dirx;y8whs68v q xected due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 mpbn9*mmq/em. th22bkg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal fm 2emmm2pt *qbb.n /h9orce 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 qbm+g v,nu28za truck. It is held in place by metal brackets that can exert a maximum 2m,8 uz n+bvqghorizontal 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 = 0.49jl .81 xrpbcw0 kg, what is the magnitude of the acceleration of the system? (Ignore friction rjb98x. l1pc wand the mass of the pulley.)

  In the Atwood machine shown in Fig. 4j x288ukez :z-:mag nk-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of thzk-2 m8x:8j gnaz:ekue pulley.)

  A student pulls a box of books on a smooth horizontal floor with t(fm q/+2 qthra force of 100 N in a directit+rhmq (2qt/f on 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 a force7vu l9shvid e;oya:22 of 100 N in a direction of 37.0e above the horizontal. If the ma 2vsay 2 velh:o;i9du7ss of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weig(senrm q dx0*. b,c+5frv-l0zy6rh ypht 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the r,cv +(b0n dhmyrq -re5.*zy sx6 lf0rpopes?

  In Fig. 4-2, if the tensions in the ropes o hce)4 3s3gabare 50 N, what is the mass of the traffiboash3ce)34 gc light?

  Two boxes of masses m and 2m are in contact wi7omn 6 ,3okflmth each other on a frictionless surface. (See Fig. 4-3.) 63mf oml,7onkWhat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact wit1 p o bh,gy*x8xt,qw8oh each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more mas toywp8hqxog,1 8,x b*sive box?

  Two boxes of masses m and 2m are connected v 1vmz59g 2nmdby a rope. (See Fig. 4-4.) If the forward forcv d59vm zn12mge on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m cusls-9 5e b/2 h,ledg;t7wquand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is lsbed csug 5qlu- ;e79th,w2/F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as stofm*x,tga : e(y:jw5v3lim1hown in Fig. 4-5. B5tx:1l,mf3 wgot :m(a ej* iyvox I 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 frictions between a 3.0-kg box c 761s2wvp .h,txo s/p gvw+ovand a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horiz s x+7w ppsw hov12.v/t,c6ogvontal force is applied to the box?

  The coefficients of static and kinetiep*th;4dh6s6 i 2swjyc frictions for plastic on wood are 0.50 and 0.spw 2eh t*jd 6syih46;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 su 3k 4s/lxlzbp+rface in the +x direction. It slows and comes to a stop wxzlplb/3 4s+ kith 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 by a 5.0-N force. A 3.0-Nfg4pzjk)ep*rsi;r) : friction force retards the motion. What is the acceleriprp*z g)esr:4jkf) ; ation of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest,/g 5c 4rlrfleu+n0ft92i-plx 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 inhtyu t(+x7zo1itial speed of 10 m/s. It slides 50 m on the ice before it stops. What iso (7 tx1+yzhut the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fizp3evr d;ia*afl+)1v j0,jz dht: bs/vq58 lrnd skid marks 90.0 m long. They determine the coefficient of 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 i3+ erlv5:1 fs;lp vhdaj vb,j/*t qda)z0zr8 brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface between s/7qrm m *jtnw00br,athe more massive box and the horizontal surface is smooth and ther mn/bramtw07 sjq*0 , 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.) The subsm uyz3tn5g3 cc56 r: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 coefficient of static friction between the brmb y5tg6c 35u:czs 3noxes?

  An object is on a frictionless inclined plane.0 yn5 o(e px5g f.y,h3tqlv8s:yfj: ly The plane is inclined at an angle j,3y:yf 5ho5lnx.8yt0p: yfsl gveq(of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angv(tq)+vpgo e )6u2 f9kcj4e, wcx m91/ cqcqktle 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 ae)g3xu )lzj faxo j4gn)jn5* 5ngle 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 ofer2d/z wnsub)/e1fk 6 ;o y*oy $35^{\circ}$ 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 doi la6 61i7 rspp 61p4ggcs4dbmwn an inclined plane, at a constant velocity of 6.0 m1ip sp 4r4dbg76mca ig6pl1s 6/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 a rough 2 x67n)w raxo yyin21g$37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m z8bp:(z(v2i(v7qdhk 4e c pijg62fo xslides 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 surfacyv(/ ak3+ -yme/rprbk e. The cable attached to the log makes an ang/-3 ar yp+ ykb/kvme(rle 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 rest on a rough inclined plane tilted at an aenfffu-;kf3qw(p8 j6fr, q 41 x1fc sangle ofupaw36; ffrc ff1, 8-ff xe k4jqn1q(s $33.5^{\circ}$ 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 ih qr xwu44uo2gf8ra8* z3(dnhs gradually incre ur48rdnqg*fa3h 28uo(whx z4ased 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?