Which of Newton's laws best explajrn*dv be/vup5j8 x,2ins why motorists should buckle-up?

  When you sit on a chair, the resultant force o;w*d c h4op2ayn you is

  In the absence of an external force, uyd3iwjfo*.6 a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off,9ka it1gue2a q5.2ubj1pe0o v while traveling in empty q2tueuaj.kp01v 2ego5i9b 1a space, the starship will

  A rocket moves through empty space in a straight line wix )x.+n2j mh,t xtno:jth 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 rnho ,x2jxtjxt: +) mn.ocket in order to sustain its motion is

  You are standing in a moving f5)yj0bojmarn :n07c 6xwqr y31ljf; bus, facing forward, and you suddenly fall forward. You cn jq1a0cj )0y b5rym7 f:fl3wr oxn6j;an imply from this that the bus's

  You are standing in a movings9bpd 0f37fbi bus, facing forward, and you suddenly fall forward as the bus comes to anp fi9dbbf7s 03 immediate stop. What force caused you to fall forward?

  A constant net force acts5 koffmjp5 .1pp,i re*q(+azf on an object. Describe the motion of the object.

  The acceleration of an object isrx-w ) c4hl *a5utbxv:u* q0ws inversely proportional to

  A net force F accelerates a mass m with an acceleration a. t olof t9y:)p82.vyzb If the same net force is applied to mass 2m, then t8o:)b t9o .2vtp ylyfzhe acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wha8/ btfzuoet, 2t acceleration results if a net force 2F acts on mau o,82 eftzbt/ss 4m?

  If you blow up a balloon20lom vbw,q2+ nd uwd3, and then release it, the balloon will fly away. This is an illustratdu+lmv,n b2wwo2 30q dion of

  Two cars collide head-on. At every moment during the cpty0bf7)g a g v4.js1 jvd8,leollision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the seconalv.vj sg1)btf7e4 ,08d jpg yd car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the object exerts on you dt /;pve -ud pqy0;a9hwih ;;ydp0eqvt-d / upa9ll

  Action-reaction force3iup khzqr 7 uxm7s5g9+koq7 1s

  Action-reaction forcesdlz 2m+mt.jz( are

  A 20-ton truck collides with a 1500-lb car and causes a lotzbx j)fw v1r+4;ar8gm: 8bbbm of damage to the car. Since a lwmmb bf4j b8:v 1b)g+axrz;8rot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object a y ocs2*ly2v*with force mg, whicvys*y*a2 lo2ch we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means o*n;6h gwke. ao sjv 2-ejpr38sf a string. The Earth pulls downward on the w*;rpj36n-vjoeesh2kas 8 g. 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 +u/ckgvo s-r81500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude i/ -ov+ rscg8uks

State Newton's three lawf tvzob7pww0 1m 0,+zb,ebr2 ys.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earthc1iy s1i/6vev . Which of the following is true about the mass a 1i/vis ce16yvnd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts yrnj9l-a6a s6 at a distance is

  Who has a greater weight to mass ratio, a pe.f (u 1z/6*a hmdjrex s9nb .nfca)g;wrson weighing 400 N or a person weighing amgz ns n;b)f.1h6 x u9r fc*d/(.ewja600 N?

  A stone is thrown straight up. At tw k -+tlq5xh6wx-zn 1,f *kzbo 7frfx5he top of its path, the net force acting on it +r6- bw 1txff,*7 5zqk wh fz5o-xxnlkis

  A 20-N weight and a 5.0-N weigju*9x/s 7 qj3bz xsxm8ht are dropped simultaneously from the same height. Ignore air resistance. Compare their accjx7b sx/ *zjuq 3xms98elerations.

  A brick and a feather fall to the earth *sc d lp+btn35(-ra6sk2bzfw at their respective terminal velocities. Which object experiences the greawk tslcpnf-d5sb3(z b2 ra*+6ter force of air friction?

  An object of mass m is hanging by a string from the ceiling of an eleva5s0pd.mb ,-lvgnh h5p/ ut ln7tor. The elevator is moving upn -vg7 /hh. np,mlud5tsbp 05l at constant speed. What is the tension in the string?

  An object of mass m is hanging by a ( 5vre x s4gi5+jd q o,67*dxpzvnwc7sstring from the ceiling of an elevator. The elevator is moving upwar5rzgdcnvv6 (xjo7sq+4 5 , p7 d*ewxisd, but slowing down. What is the tension in the string?

  The force that keeps you from sliding s).i-bq el7lf on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest thana 5fg 5y0r;:xk6tw/gc2d nbqo it is to keep pushing it with constant velocity, becau;6fr05 q k2b 5ctnw/oyg dax:gse

  A horizontal force accelerates a box 5o h8aczatc n1z:y5)mfrom rest across a horizontal surface (friction is5cnaz85cm a:t1oh)z y 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 ,o nc dulk+igtd9/x1:we can deduce thatd g,/ntd+lc :o ui1xk9

  A block of mass M slides down a frictionless plane i /o 78wpwggoajv9 2f,+6om yjenclined at an angle q with the horizontal. The9m vwj/2o8f7pgo, y6jo g+ew a normal reaction force exerted by the plane on the block is

  A block of mass M slid 8 xnaz)mo4epp a3u2w9es down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the pl8 e)93zxp 2au am4wponane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle5 fqh pb5 ,5k6eoaao6f q with the hori5,6fahp oeqa5ok5fb 6 zontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneoum5t5kot zpu;d8m hz.3sly on an inclined plane that makes an angle of 30e with the horizontal. Make a stauz5t.dk p5 8tmh3z ;motement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N forclm peoy/k.nq.9 jt)g5e is applied to the objectg.ne9 jplmt. /5) qkoy, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelera3x 6hnpj ,:hhdte from rest to 27 m/s in 7.0 s. What is the average forward f jxhn p,d3h:6horce on the car?

  Starting from rest, a 4.0-kg body reaches a yz tw2t,,w a g:fu*f2vspeed of 8.0 m/s in 2.0 s. What is the net force *,uf,aw t: tyvzg22fwacting on the body?

  An antitank weapon fires a 3.00-kg rocket,lehz1)hy;8s eqaw .j which acquires a speed of 50.0 m/s after th j)1 ,hwsyelq8 a.;ezraveling
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 ff3 ;wc7rwcpc 5bn q5*10-kg mass from rec*b5fn3w;q pcw rfc75 st,

  What is the mass of a person who weighs 1103o on q30 2py4sp(*nx/v)a rumac is.s lb?

  What is the mass of an object that weighs 250 N 4 - hgf)f2nfp3f yo1mqon the surface of the Earth where the acceleration duo m-g qfn21hpyf)f4f3e to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What isbs7i x2xqja .-(p t.q4;ragw e the mass of the object on the surface of the Moon where the j (a.w 4;q2xre-xtqgspib.a 7 acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and obri7m -s8am hdz8., ;hoirafl9ject B weighs 40 N on the Moon. The Moon's gravity is one sixol.8;dh,8- f9aami rs rhi7z mth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of b+x+id dj/0ui a 5.0-kg rope. Sue pulls with a 15-N+idu d/ x0+jbi 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 surfaw)mzdu0 ebwg9l*d 19x ce. A force F acts on the stack, and it accelerates am 0xwd*lu 9e gdw)z91bt $3.0 \; m/s^2$. 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 elevu,i sy; 0.jngwac995 jf0m kauator. What will the scale be reading whe0 .09kg9miauync ;5 jjuw ,safn the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mx9,c 0t5k5fn+ yabb oiass of the person is 60.0 kg and the elevator acac0x +5 t5n 9if,ybokbcelerates 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 the bl)2ch3 4 bn0bcf4yljmass of the person is 60.0 kg and the elevator acc0cjn2 l4lyc 3b)hbb f4elerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forcesy( /83m x.ei;jgzg:fkvok cs4 act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due no 8kfgxkgyce:vjmo4/3i;z s .(rth. 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 kg rests on the flatbed of a truck. It i31,chc0+dwvqdn e l,l zzs-4xs 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 thel,z3+ w dd1e-qlscx 4c hz0n,v load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It b3iv p/t*t8qw is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When 83*ivb ptq/tw 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 = 0nl.b g0c o-c;f.40 kg, what is the magnitude of the accf.cb; n- gol0celeration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.602z/2c rf 3orz1q kx/ck kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley.)cq2z 3cr/xko r21fk/z

  A student pulls a box of books on a smooth horizontal floor wgkd iw-0:u9 df4so7 pqb )2jmjith a force of 100 N in a direction o:-094 j7ompqjskdw bf) ugd2if $37^{\circ}$ 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 forcdw +r :tb l7(;/bkfhrlxjq7b2e 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 7fxbbqwk / r7ld;hj +2bl(:rtthe normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shozc6 l pqxtin 828mj*v7wn in Fig. 4-2. i j 76v2cx lp*tqn8m8zWhat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of th+,jq *fgr85 ogm jzzi4e traffic lightjg zoj8m+z4,5fr igq*?

  Two boxes of masses m and 2m are in contact with each other on7t sd f2njwn(n.s9u +u a frictionless surface. (See Fig. 4-3.) What(n w n9susdjfn .u+t27 is the acceleration of the more massive box?

  Two boxes of masses m an2 wqkr/q83trjpu b+ sl2nj4:kd 2m are in contact with each other on a frictionless surface. (See Fig. 4-4wjktp23/ rls:njqu qrb +k82 3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope/a uf(9v;t,kr cnzi+zbuo7 ,r. (See Fig. 4-4.) If the forward force on the more massive box is F, zrck,b ,+v z(tuf7nau9ro/;i what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. .rn,+ qbkg b70:d rvgf(See Fig. 4-4.) If the forward force on the more massinr7f db+b.,g:kr q 0gvve box is F, what is the acceleration of the less massive box?

Two boxes are connected by uoy8z4yn9ms )a cord running over a pulley as shown in Fig. 4-5. Box I o9 4)yoym8z unsf 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 stati 1,ea(prs t5bqc and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the b5aqst,pr1 e( 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 wood are 0.50 :glh5q13d mp b)6(l.nep66i eupiqkah) ic7hand 0.40,mhhl7 ipq ea5qhu6ne:1 (i66dgp)bcip)l .k3
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 sr sha +j :8:fzak kq5/espwx xlp8z,6)urface in the +x direction. It slows and comes to a stop with a :sk6p),fxhzp8 r5:j al/sz aqw ex8 +kconstant 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 horizontalu pdb0pwhpo9,-( cp+eh 3.v ic surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. Whav .ho3w(epp ,u hcpp9-+d0bict is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from +fy gwcpa 5;sn 3:a.nl;rmur* 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 100h;4 t0htafp:6is lts m/s. It slides 50 m on the ice before it stops. What is the coeffi 6hhi4 sft;:pl00sttacient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0ef7emr ymk)+sitr+1l7 9 4 sio m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.s4r 17 ms)+o9 +irimektfl 7ye500 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 sukcs8 xc-t: u-hrface between the more massive box and the horizontal surface is smooth and the surface between hsk8 c- x-:ctuthe 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.rd6(q1 uj ;pnh 4-6.) The surface between the more massive boxq6( nd pu;rh1j 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 boxes?

  An object is on a frictionless inclined planep*s;j w3 r.dqjvm( *dp. The plane is inclined at an angle of dj(jp.qwp sr;vdm**3 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hil6p(wiuza -.gua p ;-sol 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 wit *dczmw udk gd+(k-9m;7h(sg sh 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 anggdy t61yq7 ; 02fxuycv nf5ke,le 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 an0 r(t0xx aag 3aksbp36 inclined plane, at a constant velocity of a0ar3s6pakxt (xg 3b0 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 a ros65dh5n1zh2 ( spktt zugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m taim nyp:jq2 h (-ej--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 weighing 500 N along a rough surface. The cable attalu-5rk;frci/qmh y:d7 j1 v,jched trum/,:l7-jkf i51h yj ;rv qcdo the 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 ti 7ck2;(guvyd vmx 35lqlted at an angle 2(u7c ; g5x v3mdyklqvof $33.5^{\circ}$ 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.:m/ia ump 4m)a The angle of 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 t)ma a4p/m um:ihe object and the plane?