Which of Newton's law2ra ::luvalo oy*2fq:s best explains why motorists should buckle-up?

  When you sit on a chair, thr0g4 ip l(mqlc54c+n se resultant force on you is

  In the absence of an external forizmjg3 i1sfa:),-b: v fzhi3yce, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turne l acnr m:o0)*vuyno,1d off, whilelru)nva ,om cny*01o: traveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant. pdc rgkn yf2ru 3n6-l(sw-x4 speed. It is far from the gravitational effect of any star df yw(c 6unp2x--.srk3r ng4lor planet. Under these 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 forward, and you suddenly fall forwah(ruf ev8d8 z)rd. You can imply from this that t)h8 e (frudv8zhe bus's

  You are standing in a movi le i+zpzbzu7:z 65bs:ng bus, facing forward, and you suddenly fall forward as the bus comes:ip z76l zub5bsz:+ze to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an objedezdib8d7 (fn4: j/knct. Describe the motion of the object.

  The acceleration of an object is inversely proportional-gz0yxj8v l d j+j8m,mw )jvk4 to

  A net force F accelerates a mass m with an accelerati(w4v ( ,;kqdzxon*gip on a. If the same net force is applied to mass 2m, then the acceleration wildpv k;(zwi4(goq ,*n xl be

  A net force F acts on a mass m and produces an acceleration a. What sznzdxgb/5 8 )accelerationn g)z5/bd8 xsz results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly m;4 +3ga ynmpsaway. This is an illu3an+gpm 4y sm;stration of

  Two cars collide head-on. At every moment during the collisi(n8 q8zn. wgrjon, 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. Thnqgj( zwrn.88 is is an example of

  If you exert a force F on an object, the force which the object exerts on you wix. +e obc5h8rsll 8.b+e5 oshxcr

  Action-reaction forcywcknta. 6 -czvuf u7l:int78,fc u//es

  Action-reaction forcesop n1qo9ms 6n) eq)bp( are

  A 20-ton truck collides with a 1500-lb 5*bl y * 8cfm1ovs) -agvko(g,i qiu*pcar and causes a lot of damage to the car. Since a lot of gfo -aoi li5 mu)1sbpqv*v8*( kgy,c*damage is done on the car

  An object of mass m sits on a flat table. Them(c4.egrc9 vp Earth pulls on this object with forc cmv4.ge r(p9ce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiojy:s24pn ef( j 3t0pmling 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 is thj ne3 4s0pj(f2:ptomye "reaction force"?

  Your bat hits the ball pitched to you with a 15yz 3jtvy mams1n*/;b;00-N instantaneous force. The ball hits thej ya m tz3v1/;bm*yn;s bat with an instantaneous force, whose magnitude is

State Newton's three lawd 9qv;y:wnm,bkig c0 ;s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of u+vdg8)g5am l1n vv+othe following is true about the mass a)8 g 51lg+nodvvamvu +nd weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distance 9hu:au.+y1m :gcue wnm;k *b nis

  Who has a greater weight to mass ratio, a person weighing 6kp f1ub:a7ho:fk*k 7*jtw wa400 N or a person weighi7 :fw :k7u6kt1* hako apjwbf*ng 600 N?

  A stone is thrown straight up. At the top of its path, the net fov ,98 t3rkrrte( vo-srrce acting on itro e-8rr(3vr,s9 tvtk is

  A 20-N weight and a 5.0-N weight are dropped;.en q7bq6 lpk simultaneously from the same height. Ignore air resistance. Compare their acceleration;.n7epbqkq l6s.

  A brick and a feather f0, ryuhi ub)(2uwa c(yk. eix ;x6j5pfall to the earth at their respective terminal velocities. Which object experiences the greater force owe fhxb;5i u.pry02((i jxa6uk ,uyc )f air friction?

  An object of mass m is 5xqg:zd:nn*n8d p9c o hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed8no9pn d*n:z:x gqc5d . What is the tension in the string?

  An object of mass m is hamdha3 h .d x9vngq6qg.x4y :k7nging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension h3mgv .dy6xqh. dg9x7: kqa n4in the string?

  The force that keeps you from slidi56f y kb7fp ebjyp:b/*ng on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is tou;z gs*+3spg,z h )ryv keep pushing it with constant velsv )r+sp3z z;h*u ,yggocity, because

  A horizontal force accelerates a box from rest ac rmndyqn6qub((g 3p5dit -:o1ross a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all condition(pmq q35o-i6nt 1dr(bgdu yn: s remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides dob3 cv6m(m l*jfwn an inclined ramp at constant velocity. Thus we can deduce th lj*c3v m6bmf(at

  A block of mass M slides down a frictionless plane inclined at ph1w60qa1vn o av(hbf:/a32 8 lov fgjan angle q with the horizontal. Tgw / bq0(of6aah181 3vj hlvfp: 2nvaohe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless g*:jnoacrw 5.ky +ff* plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is direc*:gwrnak jy.+ *fcfo5ted

  A block of mass M slides down a frictionless plane inclined at anignn;tx0 .am; w ta9n5 angle q with the ha; nxi9amn0 ;t5gn. tworizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inct84ccfzkz( +p: ymi;flined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their(pffyz8:m k z ;4c+cti acceleration after being released.

  An object sits on a friu 4xkjx+kf l0h(9dz.e ctionless surface. A 16-N force is applied to the object, an+lx4f h juz k(k9.0dxed it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate frq y xl41*xb9seom rest to 27 m/s in 7.0 s. What is the averax y1 4b9*elqxsge forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed 3q gn+b *qpl4vof 8.0 m/s in 2.0 s. What is the net q 3lp+q4bv*n gforce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed ofs*0 imgkn)dq( 50.0 m/s after traveling(i0d )k mqs*ng
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 thepj xo9 26k:p sbd6hok4 same force that you push a 10-kg mass from reso664 kspp: k9xbhjod2 t,

  What is the mass of a person who weighs 110 lba c+4 z(ul*t9ji3td v+b1la3.-vkag0nqk ojt?

  What is the mass of an object that weighs 250 N on the surface of the Easauil df)v( ix a: my-:et16.urth where the acceleration due to gravity is if-(e:6sx )au di tvmy.lua1 :$9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Ea ta7l*s (4knpp:uo)gd rth. What is the mass of the object on the surface ofpgtkp*a:o ) s(dlun 47 the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The M.gnt0 q+.kw -kx v3eqcoon's gravity is one sixth of Earth's. Compare the masses of th.ktq ecn3-v0.gx wkq+e objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-kxkh;.t6 f;xd7 7istxgg rope. Sue pulls with a 15-N force. Whatxd t6 fk .xhs;ig;xt77 is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionlso l /0x*n)ybvh m,g,rd .8potess surface. A force F acts on the stack, and it accelerat xn,8l*or/oy)b pv dsmth,.0g es 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 el. xi*wbb7v tt 66n(rljevator. What will the scale be r6i rxvj.7*blbwt (t n6eading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an eke/r3: (gneyy9w+d(c6m awyilevator. If the mass of the person is 60.0 kg and the elev9ediw 3(wr gemcan k:y(6yy/ +ator 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 an elevator. If the mass of the person is 60.0 k(jpkkgtp pyp (r0: 18bg and the elevator (ypj kp180( :pbrpg ktaccelerates 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 8.04bz( a2 k qv0,odtrt2b N and is directed due north. The second force toward the east h2 ,2brtktzv0a dbqo4(as a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed(frb5.(ja /o)6lrya11 ea hvwo 6yqzi 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 sa/)lzr1qhr oyaiv f(bjw516(6oy a.elide forward into the cab?

  An object of mass 60020ohmjp r,tu.0 kg rests on the flatbed of a truck. It is held in place by metal brackets that cano.2 ptu,rmh j0 exert a maximum horizontal 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 = 0kpy 4x ttv:(k(.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley y 4ktp:(vkx(t.)

  In the Atwood machine shown in Fig. 4-1 xmxi 6m1s hu+toew3xi7)gt,6 dt/iw/, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass+/ts 6xot) ,g6x 7w1uwth x/iedmm3ii of the pulley.)

  A student pulls a box omud* 3qwyfqif/j7wb 5,rt *6bf books on a smooth horizontal floor with a force of 100 N in a direcufi7mw *5/ywqqbjt 6b3 d*rf, tion 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 f 4)e9pg/g+hp q8rcwz xorce of 100 N in a direction of 37.0e above the horizontal. If the mass of th )z9g cpgxqp8re wh+4/e 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 royawf0i 8.rq ;upes as shown in Fig. 4-2. a.f rqyi8u ;0wWhat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, whatqkd5 :b7 ge gu uz6ye6e60-jcz is the mass of the traffic lgc0gk6ubud6- qe7ez ez6 5j: yight?

  Two boxes of masses m and 2m are in contact wih8o3x tx)1ao qth each other on a frictionless surface. (See Fig. 4-3.) What is the acceleratio t8xhxqa)o1 3on of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictsc(o6v pr.l4 sionless surface. (See Fig. 4-3.) What is the net force on the more massive copsr s46.v(lbox?

  Two boxes of masses m and 2m are connected by as77dpln gk05k/ oc-s*ja1pxt rope. (See Fig. 4-4.) If the forward force on the more massivkp7l/nxp-ko a5 *tsg701 scjd e box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (bnb98:gcm j03we8dy6dlx sj 6See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration oe8cy:j390wsbd lnbx66jmdg 8 f the less massive box?

Two boxes are connected by a cord r-z.: h vqlc2xvunning over a pulley as shown in Fig. 4-5. Box I of mass h.xzlq2cv:-v
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 betweenisk wi* 36xn+mg4 z7js t*.bic a 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 force is applied to the bo x*s.jbi+ii634gm7ks tcw n *zx?

  The coefficients of static and kinetic frictions for plastil dav h ..0o/hy*s3ilfe.gyqc. vj1 a-c on wood are 0.50 and i1/qhsafel*lv. jgh ..y-ao. 3c0vyd 0.40,
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. + z gf n8kh(02yksg+xqIt slows and comes to a stop with a cong(s8khg0z f++y2 qknxstant 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 59nmad 9 lj5zqjmpi-2 yzgt8 *,.0-N force. A 3.0-N friction force retards the motion. What is the acceleration l ymm*5gzdj28qij9p n,t-9az of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, ag(8 5wa .nccmtt 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 1sdghu:td2+y0.nup sjl6os 950 m/s. It slides 50 m on the ice before it stops. What is5s0.9y d:pn2juh6ougdst+sl the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic a,44k sf7ub82hq tiua q tuti 71:n+abfccident, police find 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 ckh7t2aqa1ft+q bu8f 4b:, ins7tiuu4ar when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See /py vyw7x9*g-cw7vyk 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 xy7-7y*9 vy/gvcpkww 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 surface betwe(1c t ,buu9 sgh*bq9td8j*k 3helbg9gen 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 b( kgg dhj19cusugqlteh *t*39b,89 bthe boxes?

  An object is on a frictionless inclined plane. The plane is inclin (tz-ysrvq 0l3 tr81/3rsjg peed at an angle of l (383ypsj0 vts/errtqg -1zr$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makecfmmhxjs80c;/px4 s7r- m*uh s 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 w z2,adrd5ka1 bjdq7 8a smooth 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 smooth inclined plan- zrehl625rn0 ir bs2xe 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 plane, at a constant 9sr/kjge 0g*g9cp7zqawemt7r/ +r9wvelocity of 0e p7gk9z 9aj rcwqsgger*7trm9w /+/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 dow 6 ynzsq37)y s.ran9rpn 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 masssl.rgr2 spv)/ 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 weighing 500 N along a rough surface. The cable atta9;+5u i8nyz8fc0h jqcx. tpqkched tc; uq8q5ci+9ny.x8tp z0jhfko 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-;t)a:zahlom a tp, *y a rough inclined plane tilted at an angleya z t,aao;tlm)*h p:- 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 incline is graduall+ogjt +7bm61smzlu0k7c8 xv8 km,ubzy increased until the object begins to slide. The angle at which this occurs is q. What is the coefficienu7zgsbc+,b7m0 m6kvm+z18 tjl8ox ukt of static friction between the object and the plane?