Which of Newton's laws best vf*9s -s:iv rr+zknf s3ks;)r explains why motorists should buckle-up?

  When you sit on a chair, the resultant force o*a ux30zxi)+9 uwnji fn you is

  In the absence of an expqn7gcyt v-o()-x g)z ternal force, a moving object will

  When the rocket engines on the stars/pgvhh;17qhij 7q* nu hip NO-PAIN-NO-GAIN are suddenly turned off, while traveling in e7*/1i p 7jhhvqqhn;u gmpty space, the starship will

  A rocket moves through eex - x7f;y+lx5/uvreo/tijo/mpty space 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 rock/ei xtvlyr oje;/+7x 5ou-x/ fet in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you sudj.kpb6m d-6ljftb5 o7denly fall forward. You can 57 jjtl6d-om6kfbpb .imply from this that the bus's

  You are standing in a moving bus, f 2e uvdtf 1a pfet un88679q8jj-od(omacing forward, and you suddenly fall forward as the bus comes to an immed61e8dpjdtumvae 8 f q(to 7j-92 funo8iate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the mosn :duqooqyg,x 2:+) ntion of the object.

  The acceleration of an obje +hkuomt,mv mz ehs8 x1+l5ppn4u.::bct is inversely proportional to

  A net force F accelerates a mass m with an acceleration7 l33c9wv,qj .x yc3cl6cy(q4trpl oy a. If the same net force is applied to mass 2m, then t,llcyxvq o6ctqwcj34l 3yry 9.(c73phe acceleration will be

  A net force F acts on a mass m and produces an acceleratn;)wp0bpzh c-t.s 4dj vz; nb;ion a. What acceleration results if a net force 2F acts on massv0nd)4pjznpz;w ;b- c.hsb ;t 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. This qqb2fb/,+b a dis an illustr fb/q,+2adbq bation of

  Two cars collide head-on. At every moment during the collision, tha gc8a 0+uu92pcp.avfwe;t0b e magnitude of the force the first car ex8 +pace fb0w;pa2cu0 au9.vgterts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an obj1tpi nl4 .v-rckc,6ugect, the force which the object exerts on you willrict4vg,p .c 6uln-1k

  Action-reaction forcetq-wl*o1 dh0 ys

  Action-reaction forceh* 9uc4lswuj ee s(xp 7758dxes are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to tn,/klc.xkh- 2 ntw* sshe car. Since a lksn-c , .kx n*2/hslwtot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pules* gpg3pj64ra y -n9ezb:.)fw;jvz jls on this object with force mg, which we will call the action force. What is the rea43.ygspzjr;6wj9e g- z* bnfa)vp je:ction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth puri - ,mx0n)xeqjz*zi -/yc,o tlls downward on the toy with its weight force of 8.0yotx erc ,)-jiqm/,0zz-x n*i N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you 0xrr u xp.;blac0 2)ypwith a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude ibcl xppxr;ur20)0y a. s

State Newton's three lawz+z b7w,i/ 0vvwd(b rfs.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of thh cdv(r, * 4n0)3pw-ivuszzdhe following is true about the mass hp)h nzr3vi-s4vzw ud(0*c ,d and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts axhgl9h )ykz;1 t a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a j- (b re;4 n9wk0eaqkemp6(h- 2jy kvaperson weighing 600 jve-bh nwy (e9p;jk4a 0(q6 mr2a-ke kN?

  A stone is thrown straight up. At the top of its pa1 zle;iri.t; f;fl0hj th, the net force acting on j;zl0.i;f; hie1rt flit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same hbmdwe+htlt7d)/rj *tc b:- ( eeight. Ignore air resistance. Compare their acceleraw: (-bt7) dt*m tler +hjcbde/tions.

  A brick and a feather fall to the earth at their respective sd9vd9j7 n-lr terminal velocities. Which object exd9lsv ndr -79jperiences the greater force of air friction?

  An object of mass m is hanging by a jxy27 tjz3 .w q97wh0ie6zhusstring from the ceiling of an elevator. The elevator is moviwqi 3hzsj zw7.tu0 2h796jye xng up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the b /;pni 6xh6bsxrm /l p)+tt*fceiling of an elevator. The elevator is moving upward, but slowing down. What irtfhx t6 /p/*bx; pi+sbl)m6ns the tension in the string?

  The force that keeps you from sliding oz.eqls*.m2 y(nyfh3lj:yp *cn an icy sidewalk is

  It's more difficult to start moving a heavy4r3dm-a w e,5v,lwsjl carton from rest than it is to keep push,re5dlma,vwsw - l 34jing it with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface .(lkqrgg jk: ,(fric(qk,gg: j lk.rtion is 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 can 4oi+h/ (*r(xay*u cgw()rnqsr:o nlqdeduce th4)gx:*ru+/ycqlqw n(s( * (aornroi hat

  A block of mass M slides down a frictionless ploht fsr) mog c33mz)o4e2 -bx4ane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blockt3c4oxf ezr g234b -soh) mom) is

  A block of mass M slides down a frictionless plane inclined at an angle q:jf/7ro(vfzb g s3;yg with the hovb( f3o:/syf;7zgg j rrizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incline)5m1 wg 2. rivvi+bxdtd at an angle q with the 1txir+)idw 5m. vv2bghorizontal. The gravitational force is directed

  Two toy cars (16 kg and 0,4sog)qpg m mxw35,yrcqy 6 i2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a gqwq5myi4pgy)s3cm ,,or6x 0 statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is aq*x9g02 c/g9v,rqs pv4ww gwmpplied to the object, ax v, 9 *2v/cqwp9sr4wgmgq gw0nd it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can wv/ wtuoyt +33accelerate from rest to 27 m/s in 7.0 s. What is the average forward force o/3ttvywu +o 3wn the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in bkz7wo(+t (yazm kak*s d3 )q*2.0 s. What is the net force acting on the bod*()kq3zkdmkwsaz*bt 7 y+ ao(y?

  An antitank weapon fires a 3.ca(;6 nq8b3 fxoy.af t00-kg rocket which acquires a speed of 50.0 m/s after x.6fa f;tyq b(oc8a 3ntraveling
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-kgjab0u- 6c7s sl mass from res-suclb6s 70jat,

  What is the mass of a person who weighs 110 lb? q +j3/qbrayzqp pyq)nse/-)bve j:69

  What is the mass of an object that weighs 2f 2(ju;ev4fx sng a+4 os/inx250 N on the surface of the Earth where the accelerago a(fn4ex fi2;xj vu 4+n/2sstion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the g1c9zasn2u8(e c xk2cjbh :)b Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of t c b: zhguk(92c8c2abjs)xe1nhat on the Earth?

  Object A weighs 40 N on Earth, and object B wn6in6plb n7u 0eighs 40 N on the Moon. The Moon's grannl 6b0i6pn7 uvity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pullingvd9w dz5pdm k pz: /m/g)1mde8 on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sudm85g1ezk/: ddm w9dm)zppv /e at $2.0 \; m/s^2$?

  A stack of books rests on a level fr5g(o97 m+4bnzrg-);vfpkcl fmaq:8oh h)y nzictionless surface. A force F acts on the stack, and it accelerates ato n9hy4;(azf :87gpg-b knf) )z5vh m+qrlocm $3.0 \; m/s^2$. 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 elev x4n,p tn-3+u+ubrf v p3erez7ator. What will the scale be retupu x+b+-3e 4fvrz pn7e,3nrading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is;y gj8sb3rwg, 60.0 kg and the eleva;sr,8gwbg 3jy tor accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in* .v sho2gn z 6sheu*d.(ezix- an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upwahe( zo-ss2..ugde6ivx z* h *nrd 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 magn f: +s;ovroh(bniroujp3- o(5 itude of 8.0 N and is directed due north. The second force toward thuonvs( ;phof5+b -(3i or: orje east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests) : qjpwkype. *w,v(lr 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 distance if the load is not to slide forward into the cappj*,kw)q(ew rvy. :lb?

  An object of mass 6000 kg rests on the flatbed of a truck. It is h nc6bpuoy.ji-k++1n7 8 rpc2w+wwrf beld in place by metal brackets that can exert a maximum horizontal6 rp br1 p2inu w.y+cnfj+ k+o8-bwc7w 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. 4-1tpgfl(5uz9p4 * mdw0t, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass9mup4 zt( d wpgt05lf* of the pulley.)

  In the Atwood machine showx7(;hc / bstrmjte u9;l/hx2v n in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the m;juv mr cesxx(7;//hlht92 tbass of the pulley.)

  A student pulls a box of books on a smooth horizont9s vj-xxwt6 x(n*ky4nal floor with a force of 100 N in a dire*vxn n(x4-w 6tkx y9jsction 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 4jbof)8;0 k+uwz fvhgon a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If tk4) 8+f hjuw 0vzfbog;he 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 e /nc84rivea8/izf e7 as shown in Fig. 4-2. What are the tensions in n7/a 4efi /ezeir 8cv8the ropes?

  In Fig. 4-2, if the tensi r0l1n/e q;myo;(w ebbkm-;py ons in the ropes are 50 N, what is the mass of the traffyln;1prbwe(;0 e kmm-;b/ yoq ic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionles 0 ac6f8-noqdynk,9wxul* pn1s surface. (See Fig. 4-3.w l1d0 co, nkuyfn8*6xq pn9-a) What is the acceleration of the more massive box?

  Two boxes of masses m and1oijq gqkg4yl(9yw wj9i0a8: 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.k9y9yj wq :oii1g4g8 wla j(q0) What is the net force on the more massive box?

  Two boxes of masses m and 2m ay 3l.sg j.my,kuqs5-c0) ai drre connected by a rope. (See Fig. 4-4.) If the forrdyikgqs m,5.ys)c-j 30l.au ward force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a r :1jluttsuw)qvuq.l448gs ;; 0mdmerope. (See Fig. 4-4.) If the forward force on the more m mqv j;qe:.t )s 4lw4u0d 1;lsmtugru8assive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pullfz5 jxff61toc*i86ww f6c cw; ey as shown in Fig. 4-5. Box I of*f 6;cc6jf6fi ww f 1zc8oxt5w 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 az naay(3qxtumz( (,b1 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 foz(na, yzm( (xub31taq rce is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.5pm5+yca:ub jv,;1y rw 0 and 0.1,;v:p wra yymcb5+uj 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. I mn)y4p qq2gup5:oosu1cil.9t slows and comes to a stop with a o5quol c)u9.qyi n42 :pgsp1mconstant 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 horizontalbksfjbe om a9),b1f 63*n 3ifr surface is pulled by a 5.0-N force. A 3.0-N frio rf eb,kb* 13)6f3jbnsma fi9ction force 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, at a rate/a)z 0gpd;a lx-xa-av 1ziq 5ogw)nm3 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 m/s. It sliu3 02pbr, q,v 4;ur4hyzhqomndes 50 m on the ice before iprqrub, 2;o4 304hvz, m hnuyqt stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid/qli lt9yl1 (q mplq;;j1erh( marks 90.0 m long. They determine the coefficient of friction between the car's tires and the ro1 i1(q;jlqhleyt(q m;lplr 9 /adway 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 surface betw+ x3rtgixbv .)c(,53)9uzzcxgu ua hceen the more ma9.c ,urg cxvx+a)zz(g3cix b hu) tu35ssive 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 wk:lupey --9r 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 rk:-ewlyu9 -p the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictiontchisgyu/w*i1 2ytf*;our2 0 less inclined plane. The plane is inclined at an angle o0 tuwufhi2i c2 ;*rsoy*g /1tyf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides d xx *s rrek3,dol kkip09u2;;vp f.n3kown 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 planed lyco,j+oq1 v4pv* mv hz /l3/7i9ubr 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 t11crcm)0 yx *) /;ievzauthens,8wwtilted 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 dop bs/ jgz02 4eg9jjh5fwn an inclined plane, at a constant velocity of 6.0 m e /jph2bg0z45jgj9f s/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 zh q /td:5ga4kv(f- yadown 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 doq.e pzj*-p5 8m 9zxzdcwn 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 weigyi 6fbdo- :.*e7o6e dzji.hz uhing 500 N along a rough surface. The cable attached to to-67z f.uz6i e* yjo.:dbihedhe 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 releasedw7 x e1f2siu(g2pc)og1di7 x d from rest on a rough inclined plane tilted at an angleu( 2wf7scp )ixdged 1xg1io72 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 inclij,q y uu6 y+qvctd*lj+(/ep-x ne is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coxqpdqlcy+ ,-jtyj /(u +e* 6vuefficient of static friction between the object and the plane?