Which of Newton's laws best explains why motorisaykdey+v+y.ko k00tut x38) lts should buckle-up?

  When you sit on a chair, the resultant force on yoj63 p3k i,2zzdh8br fbu is

  In the absence of an +0b;yaen ; e)f8zzvyg external force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turne vpvofv, p.l(;ow0r nw bz90r6d off, while traveling in 9;ofzb0l rp6 owvnvwp.v(r0,empty space, the starship will

  A rocket moves throuxni c81e/v0:azext y 36 qjn/(ty bk*9d(rvmsgh empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under thes9:se3ntkay8e(1 (z cixn0* jd t xmb/6ry/q vve conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing for8umvbn z3*wu1 ward, and you suddenly fall forward. You can imply from this that the buu8*1b w 3uzmnvs's

  You are standing in a moving bus, facing forward, and you suddenly fall fole -uc1kuacx , +snz7ccdf5r( bst49 2rward as the bus comes to an imdu4ucr7z5exskcfn1-(s9c tba l,c 2+ mediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Dat3k3an d70iqd 4uo 3xescribe the motion of the object.

  The acceleration of an object is inversely probhx7p( l,ttmx 9tq,l9 portional to

  A net force F accelerates a mass m with an 2u9eeg4 d/kuse/zm24zkyt) z acceleration a. If the same net force is appu) 2zzd2e 4kyu4zge tk m/9se/lied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration0p9c;sg lx.xi )o/b0n otqt m+ a. What acceleration results if a net force ;t oxnpcts/ +lo)mb qg.0x09i2F acts on mass 4m?

  If you blow up a balloon, and tha15 ;pnprv j*yen release it, the balloon will fly away. This is an illp5v*n ;a1 yprjustration of

  Two cars collide head-on. At 9 yko tjkhju9y/l)* w8every 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 first. This is an ok y ulh998jjt)k*yw /example of

  If you exert a force F on an object, the force whichwoi4piiql8j 7w1g9n / the object exerts on you wil4/ ww9o7n1jlp q i8iigl

  Action-reaction force7kocri (;)i v:rsj/t cs

  Action-reaction forces arek,1ldmp:e k-s x9x0mxih d-m8

  A 20-ton truck collides with a 1500-lb car and caus m *4sd/*jbjb)7vki xjt;pw-z2 zy)hmes a lot of damage to the car. Since a lot of damage 4tp-jjy2m xmdbb))jzh s7*vz ik;* w/is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this objy9f /g9u6ycsject with force mg, which we will call the action force. Whf j/9sy9g6 ucyat is the reaction force?

  A child's toy is suspended fr ob(x bb0gzny0x pgg,ae1g t;l12,d;uom the ceiling by 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," what ig 2bb;0axd0lbuetgg; p,1zn1x y (g ,os the "reaction force"?

  Your bat hits the bal4xi ze /8cxdk0yc gom8e/r.wz ufl/;6l pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitu o8zmcwyz 8ri/gu4c/ex0k.6f/ lxe;dde is

State Newton's three lawlyp.;6 w2 .g0h8n p(gwab+yiy+ownams.

  Mass and weight

  The acceleration due to gravity is l( ) qwy9b5d+siml iy/fower on the Moon than on Earth. Which of the following is true about the mass ()iy9smwi b5/fl+d yq and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whicvw.grm, nqrqk3cq fl9h0/-5(9t r mpqh acts at a distance is

  Who has a greater weight to mass ratio, a person weighd4 00yim ;tvnving 400 N or a person weighing0vi0d 4; tvynm 600 N?

  A stone is thrown straight o*yqpzba27p 8mul4i r),zls* up. At the top of its path, the net force acting on iy),z*lp8o ir7 4*pusqlba2zmt is

  A 20-N weight and a 5.0-N weightjd h 6n t:l79yg4ig0 h)ht-fprk9 g-ao are dropped simultaneously from the same height. Ignore air resistance. Com0glrh fyo69 ghjp4ad:tih-9-kn7g)tpare their accelerations.

  A brick and a feather fall to the earth at their respecd*/ :)7 ucouh ufall9rtive terminal velocities. Which object experien uc9*h:rl )duul/fa7 oces the greater force of air friction?

  An object of mass m is hanging by a string from tuym8o5.;r ee zhe ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in ourz;8 .emey5 the string?

  An object of mass m is hanging by 8, q4l.h+r8n5ulya k ce*oiyf a string from the ceiling of an elevator. The elevator is moving upwu,l5l 8 cy fqhy.i+*oak en48rard, but slowing down. What is the tension in the string?

  The force that keeps ynve n087vuamph 7*9bqou from sliding on an icy sidewalk is

  It's more difficult to start moving a ht:8+w l4 3jai1qwl h nuiwh0)jeavy carton from rest than it is to keep pushing it with constant velocity, bec)4uhwq a3nwih8j ij +t :l1lw0ause

  A horizontal force accelerates a box mdgno zf,r,)4 from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is double m4z,rgdn o),fd. What happens to the box's acceleration?

  A packing crate slides down an it3i*ifj 8h4 nw;qfy5 nb)iln6 nclined ramp at constant velocity. Thus we can deduce 5w)fn 8hq46i3i fn blj*ntyi ;that

  A block of mass M sli t;+ezq cpk.z/+( *pyh 5ulaamdes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction forla.z uc ypekm+/q tz5p(*h+; ace exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q w zv99 ynj0v1 q5iu+sjf +9w v*6wqfojdith the horizontal. The normal reaction force exerted by the plane on the block i+i1 wdzv u9njj*0qs oyw+ fqvv96 f59js directed

  A block of mass M slides down a frictionless plane inclined at anr5i,ye 1;,sj,s.5v1j;af igwhv e joo angle q with the horizontal. The gravitationalg1 5.i v a,j seowij5, hyesf,vr;oj1; force is directed

  Two toy cars (16 kg and 2.0 kg) are released simucmo9 /4zr,s5 xgx*c hmltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their x*mghc9z /s 5,4 ormxcacceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied5+v:2uu s:s d jhfx)ru to the object, and it accel:d):2f h5 rujuu+ vxsserates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest.6x9j 0ldio em to 27 m/s in 7.0 s. What is the average forwardlxo.dme j06 i9 force on the car?

  Starting from rest, a 4.0-kg body r tbq8;rl: p9afw 8np1peaches a speed of 8.0 m/s in 2.0 s. What is the net force 9p fpl: q188tp;wrabnacting on the body?

  An antitank weapon firli1/+ hcr oy9mes a 3.00-kg rocket which acquires a speed of 50.0 m/s aftc/l 19rhy+i moer 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 with the same force that you push a 10-kg mass from x..toz z-ye9qrezozqtey.. x-9 st,

  What is the mass of a perso*1 l iv dbfx7,;+/wy) xeyiaee:vs3fa n who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth wherwvd idyt.bhb:urt3lb(:b z ,i.9 tm7;e the acceleration due to gravity istv.7ibrbbd w.l(,hm3zutb; 9: d :tyi $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the obik2rby67 w-6t (z3vmvsnhnr5ject on the surface of the Moon where the acceleration due to gravity m- 6 yrh6(5bn2vzvw7k3ts niris only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the tc3y/ta-.loz7 hiot:Moon. The Moon's gravity is one sixt-./a3:co hitlz to 7yth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg ropv3rks+j)-6mkc q *n;0gvuytlr/,l oqe. Sue pulls with a 15-N force. What is Sean's force if ;n6/rk )msjrc*v-3t, glyq+vl0quokthe rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a le spa/hw7)f z9g;a/ isuvel frictionless surface. A force F acts on the stack, wh79s/ ig;s a)au/ pzfand 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. What will the scau8 p4wmqaba le87*da-g s :dj;le be reading when the mdu8 q;a*djp abw-4g7: a8e slelevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of vi,6yq-9xer(vp) ku iz d34o dthe person is 60.0 kg and the elevator accelerates downward wi,vx) zdiqur pdv3(-o9kei 6y4th 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 the mass of the person is 60.0 kg qlk5 uduur*lfc ukn/v:3m ;)x.wcj 3+and the elevator accelerates upward with an ac:3 ujc+k.xn*f cvumu3klr /)dql wu5;celeration 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 mwgwn2k 41up /9j18nu+occi vxagnitude of 8.0 N and is directed due north. The secon 918g+px4 v2nojku c 1c/uiwwnd force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the fld)*v*- ytln;at 9uoak atbed of a truck. It is held in place by metal brackets that can exert a maximum horiz tt*)l k*aov -;yaudn9ontal 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 60/k +pvb,pmk; l vx41t7+ibvz z00 kg 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 vkbpxvzl4/z7, ;+mktb1v i +p 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:iu4x 99cn wt: zrj8hc m = 0.40 kg, what is the magnitude of th u 9w:jh49:cinctxr8 ze acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 09 y1*+dr9bq n5yeqkb o 83(fdqkycfk+.40 kg, what is the tension in the string? 9kc5k+oqdnedqff qy3yy 9*(r b1bk8+(Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth hori6d-;ux bq0e;*r: e o./ a2yrealkesspzontal floor with a force of 100 N in a dirxkrs0eld by6orqe*s ./e :ep2a;-;a uection 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 force h,b x jr 7/x)u-1ryeyuof 100 hy)ejyx,ub urr7- 1x/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 normal force on the box?

  A traffic light of weight 100 ge(vz m w70kx,N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes7kzxm vwge ,0(?

  In Fig. 4-2, if the tensiomkv (1*yma1.yy9 ngwuns in the ropes are 50 N, what is the mass of the traffic light?yvg19 u*y1m(.y kawnm

  Two boxes of masses m and 2m are in contact with each other onxr53cm1zvu:bk ti8: a a frictionless surface. (See Fig. 4-3.) xaztkic35u18vmr: b:What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each o9lsdeco0;,o uther on a frictionless surface. (See Fig. 4-3.) What is the ne,s9; e dco0luot force on the more massive box?

  Two boxes of masses m and 2m are 5da7 1i cw7mec3f*p zhconnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connp z*ifc7amwd5c1e3 7hecting rope?

  Two boxes of masses m and 2m are connected by a ropz8 zh;vl23g dwnv8,ype. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration ofgdp v, 3;hnv8l8y 2wzz the less massive box?

Two boxes are connected by a cord running over a pulley j;p)kcm 0*a yr)yw)4x o4g lc eq.(riras shown in Fig. 4-5. Box I of p)wc4iyc) eraylxr gj0q*ro m(.;)4kmass
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 andbei px, 98v 10o8xwlkv kinetic frictions between a 3.0-kg box and a desk are 0.8p,oi98 vv xkx1w lbe040 and 0.30, respectively. 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 frictixwnv/kb;e 6s3;cimx5 l mij*5 ons for plastic on wood are 0.50 and 0.nlm*6xw mib i vx 5e5c3/ks;;j40,
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 coz-z +yeb*.p2-da yk p4uws*ixmes to a stop with a constant *x4pkaze2y sbu.- izd p+w-*yacceleration 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 paoy/na)yy nt 8kvy9, 7ulled by a 5.0-N force. A 3.0-N friction fo) k/ya,9ytnv ny7y8 oarce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest,ij g+2z;u 6r d3 hd81.jebqejc 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 10 3tw); si(8.7y3(omgny a n ncp9y jofdm/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic fad.s niw ncj 7(yp(m3ft839)yg;n oy oriction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks gnp*tzy8 m.o3q9 hc;m90.0 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 thetpym8q *m9chng3o .z; car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See in pg *-;otyi7chr1)8,gdq te 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 static friction forcgg tp7ryei n,tiqd *;o- h1)8ce on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.)bfx wn( e.-b0rqv0me, r4j/ecd p0h(r The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is 0(-fh mrrp4qbb,(cjxnre0ved./e w0 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 plane. The plane is inclined at an anglg 6cx2zn iv+h96q yq*he o92x6 +*v6h niyzqgcqh f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides dowhy0vl p 8 z+i-sx3lb3ef4f.kvn 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 hu kl b ;+hs-0x(utax9an 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 qs zjb+ g5x )r/7-gfgvo)o2dy 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 diemoe4m4b8-;6tudu i e dzv;5o rectly down an inclined plane, at a constant velocity ofu5 mie 4-4d;tzoo6u8dmvb;ee 6.0 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 m slides down oieq-07tv lzx e:4/jpa 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 mas.dxw-s ay+( ufs m slides 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 weighinfr 2v (gyc7md*g 500 N along a rough surface. The cable attached to the log makes an anmdrv7 ycfg2*( gle 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 tiltvvqa81 oud 3n8z 0fr/ued at an angle3 q/vo180aznd8 fu vur 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 o.maq m**:ix w)ykutxx c1f -t,f incline is gradually increased 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 plt*u)-xxi .1* :t,fckqax mwymane?