Which of Newton's laws best explains why motorists shoul2o-bl :ig)tcza,om q9iuz rx(( od- 0hd buckle-up?

  When you sit on a chair, the resultant force on youmsi.00 ptudje-/,(kjrb3ttmt d:pv 0 is

  In the absence of an external q1zxddpu- 4f+l: *)1 qwob*fbil5f rx force, a moving object will

  When the rocket engines on the star l9**pko ufmx pf;6ch+ship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship w* u +lhfp*6 9fopx;mckill

  A rocket moves through empty space in a straight line with constan;k+ */wmsus/f( mr3b zymzj 9wt speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applmby /m*w+9s mz f skj;/z3r(uwied to the rocket in order to sustain its motion is

  You are standing in a raiu )rsi.si 54 zi9.rmoving bus, facing forward, and you suddenly fall forward. You can 4urr airi9is. .i5sz)imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fruf/re po*mpe8z(wx3 o0tbvv q51+ b/all forward as the bus comes to an immediate stop. What force caused you to fall forwa+exbpt ( 3uorvrf*v/5 8q1zb/p o em0wrd?

  A constant net force acts on an c 8/p/jqkwx35: isgceobject. Describe the motion of the object.

  The acceleration of an object is inversely pml )x j7 *bikgl;w4d9proportional to

  A net force F accelerates a mass m with an acceleration a. If the sau vvfmt6zj0*4 uds s+3me net force is applied to mass 2m, then the accelerafs 3jv 0dsz6u+v*ut4 mtion will be

  A net force F acts on a mass m and produces an accelerosgwboy h19lfi9z6 45ation a. What acceleration results if a net force 2F acts 5z6w yl ogoi19fb94hson mass 4m?

  If you blow up a balloon, zhl9yqq 5w 4p5and then release it, the balloon will fly away. This is an illustratiqq5wh45 p zy9lon of

  Two cars collide head-on. At every moment during the collision, the magnitud8 3rte4pn8ej i7o4dki e 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. T8ni7k3 84dtpe r ij4oehis is an example of

  If you exert a force F on an object, the force which the object exertc: bu7v0xt4p+vzx yqpk m e4)(s on you will4xt7byqp)mp: 0xk v4u ez(vc+

  Action-reaction forclh )1:0i 3n6ozkdvkkbu t.e :ges

  Action-reaction forces areqb1v -1u(dlku

  A 20-ton truck collides with a 1500-lb car and causes a lot of dambrgp73js, j y.+*mpmbage to the car. Since a lmg.m+b73sprjyjb *, pot of damage is done on the car

  An object of mass m sits on a flat table. The Earxx--xs62knzc th pulls on this object with force mg, which we will call t-x kc6 sxx-z2nhe action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a str:r,fywy gd0) ling. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction fordlr ,y) :fygw0ce"?

  Your bat hits the ball l8d s;yp8m,qlam;v9 lpitched to you with a 1500-N instantaneous force. The bal9lq,mvy8 ldm;a ; p8sll hits the bat with an instantaneous force, whose magnitude is

State Newton's three la*j9df-kn) bvs ish94e ws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon thahd 4g;iq ek fa(-7)srtn on Earth. Which of the following is true about the mass and dgfks7i ;(-aeq )4rh tweight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dista-7- r (lpbham8t2/ k 1lmz d/;wzorfucnce is

  Who has a greater weight to mass ratio, a person weighing 400 N or e r+:dy4hfc) msd06yj q krb4vow h1mlw3j*:0a person weighing 600dy r3*yh:0q6fe0 h + db:4c4 sommw1v)k jlwrj N?

  A stone is thrown straight up. At the top of its x(q ro(1fpxkeb7)ci :path, the net force acting on it :q)((f71pc xeb xor ikis

  A 20-N weight and a 5.0-N weight are. v css :(nim70ev4xyz dropped simultaneously from the same height. Ievx7ym .(n0 s4z:vcs ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at t:-tzhn; j))mp oyy1r;nps b;uheir respective terminal velocities. Which object experiences th1 p;b yos;)-ptyrhn:z)m ujn;e greater force of air friction?

  An object of mass m is hanging by a string from the ceiling kke /.ys4xi ;xk(8zllof an elevator. The elevator is ml k;ky8./(x kizlxse4 oving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string :9hmlt0zb nh;from the ceiling of an elevator. The elevator is movinh thzm n:;0bl9g upward, but slowing down. What is the tension in the string?

  The force that keepsw3h2 iqvgzg41j/vkexn e3(5 o you from sliding on an icy sidewalk is

  It's more difficult to start movio1 (*o7 aru zlk;ud:fkng a heavy carton from rest than it is to keep pushing it with constant velocity, d:7(*o r 1a;flkzkouu because

  A horizontal force acceler2ov arhigy r,58 bs4n;ates a box 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 doubled. What happens to the box's accerhoas igbvn 8r;4y2 5,leration?

  A packing crate slidv 5uih6a.zd+/ss/l cges down an inclined ramp at constant velocity. Thus we can diualz/sg+ 6vhd/s c.5educe that

  A block of mass M slides down a frictionlespzq.4(r4fv rrg4cyw2s plane inclined at an angle q with the horizontal. The normal reaction force exerted by the v 4r (fgpr2z.y4q4rcwplane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q with 57xw37ht hgus the horizontal. The normal reaction force exerted by the plane on gh wt7u 7xh53sthe block is directed

  A block of mass M slides down a frictionless plane inclined at an angx-uq9p0b p7k 51 w+1hlktf bgxkwjajr5z,u -3le q with the horizonbzl9h5wjpkgxjr 1t3-k u x a0,fw7qbp 1uk+-5tal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released sin:-*zog8yd wal ylx fz0+/* timultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which: w y0g+n8/dilox z *-fy*lzat best describes their acceleration after being released.

  An object sits on a frictionless surfa rbz1 a(q(b85. f79 bpz1lpn4 klylskzce. A 16-N force is applied to the object, and it accelerateqlrb5.b4 zy1a8(zlp9p1(b fz ks knl 7s at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from resze)1) qkktki lg,b +m8t to 27 m/s in 7.0 s. What is the average forward force on the car z)),1kqlb8tmeig+ k k?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 6z e-4m/bdww6g iufrkul :.x4 s. What is the net force acting 6. elwr4zd bk6i/-g umx4ufw: on the body?

  An antitank weapon fires a 3.00-kg rocket which acq0+ tqye y ,s;ny9h6hab 9xs-ooawu6 6huires a speed of 50.0 m/s after traveling n qh-ues9o,obs66 xty0hyaw96 ;+yah
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 pu h: 5+mgh uc*wmo9+jwlsh a 10-kg mass from rest,o9hw m5m* uw+glh+c:j

  What is the mass of a person who p *r dly-ixcl,vqlpx 2.c 4)+a4a nou9weighs 110 lb?

  What is the mass of ankq r (581;9xdkbzxyzy wz*dp) object that weighs 250 N on the surface of the Earth where the acceler;*z wy drdx8y )5(pzk1zbxqk9ation due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the objw a.rwk5 -tiz0x.kvl/w w6tz8 ect on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earthk5 zwtit0x . w6-lrk8./a wvzw?

  Object A weighs 40 N on Earth, and object B weighs 40 N ox:g u w7:/utb3vh0ihvn the Moon. The Moon's gravity is one sixth of Earth's. /b0i:xtuv 3wgv u7h: hCompare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kg x8av(k wa17g*7b9 u rek y-e6a1ki hksrope. Sue pulls with a 15-N force. *gskkk68-xyb 9h1a i7(a7vewu1r a ek 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. A force F acum cyr *-0,pmwts on the stack, and it acceyup0 rcmwm-,*lerates 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 anrf rkll m48jgq29,fc, elevator. What will the scale be reading when the elevato4 j2 gcrfq8l9lf,m rk,r is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person isi 6+l4eaif*r6hf v1 sd 60.0 kg and the elevator accelerates downward with 16 4lviie6ra d*hfs +fan 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)wd lxjujk:-(g 24sr2hv 0l fg mass of the person is 60.0 kg and the elevator accelerates upward with dxh wg0:gflju-(l22v js r)4k 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 cp35itjn / h4ghas a magnitude of 8.0 N and is directed due north. The second force tptj /3c hg45nioward 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 flatbed of a truck. It is held in pl; +c0k ,5hmaj)a lpa*juydu s)ace 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 t;jjc)um yalaa),+pu0*h d 5 sko slide forward into the cab?

  An object of mass 6000 kg -- c l: pvdq0tmsmo (3:mnbnc cdy8*/wrests 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 truck0md qs*bc8vn-c 3yt-pmn m:dw/:c (ol 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 machinen ytj7r2-qu(pb *.d (fk1sokd shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction andk * qtsp(ud. kr(bnjo1d2y-7f the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what:911q 0e0jl j3e vpli6n: j a6-o8nhkmclszvt is the tension in the string? (Ignore friction and the maseq v0-6ljk0:a oecjmi zvh918s:nl6tn3l1jp s of the pulley.)

  A student pulls a box of books on a sm 2js,wsq fk9zive+7 ,zooth horizontal floor with a force of 100 N in a d e z9zfw,jk+ 2vs,s7iqirection 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 b+1pzu5ug whi+ ooks on a smooth horizontal floor with a force of 100 N in a direction of 37.0e agu p5i 1++uwhzbove 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 Fikn2q ujs ;1(a g4a4yenee03qig. 4-2. What are the tensions ia s41 e4a( ygkj30enuiq2eqn; n the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the massq78kr0fdc3/k bveqh ie3; w4a of the trafir/e 3qae;f 7 hqc8 d3kkbvw04fic light?

  Two boxes of masses m and 2m are in contorqrr 2 ;y.g1mact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive r ygqr.;m12ro box?

  Two boxes of masses m and 2m are-37nwf s4us 8uw )vlev in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mor7u ss8wfuv-e l 4w3)vne massive box?

  Two boxes of masses m and 2m are connected by a rope. (See isd5t n g( v+6witz38 qt6q7ws3iruh1Fig. 4-4.) If the forward force on the more massive box is F, what is th5 +6u1wi3q n (s6itw tt37idqhsrv8gze tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a r 4ggjahj 1he d )s9,8sswtn13bope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acc4sdba g8hnjh9wt1,j)s 3ge1seleration of the less massive box?

Two boxes are connected byd5djo633-np/fus6:f8j g ;fdi qsvj o a cord running over a pulley as shown in Fig. 4-5. Box I of majvnj3ifj fopd5do3u8s6f g- q6/s; d:ss
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 ffg gewicg(era j/;/ ),rictions between a 3.0-kg box and a desk are 0.40 anefggc;g)//i (ea, wr jd 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 frictions for plastic on wow* 0*spuj 6q.qch2h;adur ht0od are 0.50 and 0.40w;2sat*hrhj* 0qhuc60 . udpq,
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 s4wqgk .rtyxn 1xwxh8sd (*-4 k10 knllurface in the +x direction. It slows and comes to a stop with a conqn1nkl*l(0gy8 wk h4-s 1tdxx x r.k4wstant 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.-.gu3hz;jtox9y o0g (d oxpx:0-N force. A 3.0-N fricz:03p xhd.9;ot gy(ojxo- xugtion force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 kct:bs )e 975oi3v vyiN 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 puck is given an initial spk f3)lirssck;vsv.+wxold ck: 7/8-leed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck-;scfvv wd oxkrlklkcl s7 i.8:s+) 3/ and the ice?

  During the investigation-/sf p yud:tn lxow4hne1y)-9 of a traffic accident, police find skid marks 90.0 m long. They dete:4eynfh1x9 s-/dy to )- puwnlrmine 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 brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The suzi)jsql.fs(n.d - + rirface between the more massive box and the horizontal surface is smooth and the surfacsn( i-. f.rd jiszl+)qe 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.) ecl f.uu3(8te The surface between the more massive box and the horizontal surface is smooth act(.eu 3u fle8nd 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 boxes?

  An object is on a fri)tr+jv *twg:el48eve ctionless inclined plane. The plane is inclined at an angle o vtj8+eg e)te* lrvw:4f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down z7 / ,h a neu9n;wd;;kgi9htwya 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 smooghhiei*qod1 f,+ 61g )l5mo zg8n(yxgth 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 smoo*f1zio7xxqqky7 p y9- th inclined plane tilted 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 inclined plane3 c7yfg rxxw85o 0q2pj, at a constant velocity of 6.0 m/s w7qcx0j8yx5f orp g32.
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 a0 ba5 fmmhok1,4fh uy6 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 s8vk etu38:jz xlides 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 weig:cx sauw8jj;50p-gqs. r.r ehhing 500 N along a rough surface. The cable attached to tha :r cjs.5u8;q0jewg.sxh p-re 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 released from rest on a rough inclined plane tilted axm9 zk/sit6:d t an angle of/ki 9:t6d mxsz $33.5^{\circ}$ 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 ifh,x6x ,a+rq omvoz0ry8 q9d7 -.uo5:r kgkj kncline is gradually increased until the object begins -vkr r5qa7r6fm, o h80y zkd9xjo+o:. q,guxk to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?