Which of Newton's laws best expla(1 co4v - xs7riycw we-j-v:v7z dkfa6ins why motorists should buckle-up?

  When you sit on a chair, the resultant force on 0 h35fl j1;fvxg,o1 kkj.ke bcyou is

  In the absence of an external force, a moving object wilve4hcy2 6r m2al

  When the rocket engines on the starship NO-Pryrhikv :.4vch( g g/ .l4vv9zAIN-NO-GAIN are suddenly turned off, while traveling in emptrhi(.r/zl4g4g v: .k9vcvyvh y space, the starship will

  A rocket moves through empty space in a straight line widt* zqkw2st,nv8n., j th constant speed. It is far from the gravitational effect of an,djn zn,k*t 8s v2tw.qy star or 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, facin8r;iz5lph (jvy e (x9tg forward, and you suddenly fall forward. You can imply from this thatxe(9pr yv ;i 8hlt(zj5 the bus's

  You are standing in a moving bus, facing f z7/yp-gnyvp)1 eln1 lo8ejzco9 z,i 3orward, and you suddenly fall forward ao) -1i3gnj7vp 1 e,zpz y9ylzl/ oe8ncs the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of44o-2k b5qjvvhvnk8 t the object.

  The acceleration of an og0fb*r kn+ /r-g1hsiibject is inversely proportional to

  A net force F accelerates a mass m with an acceleratio9v gsc o baw6bopro)+t(q/x,3nv*s- vn a. If the same net force is applied to mass 2m, then the acceleratiov o/rpon9w(ca3b)6 xs,*s g-v v+bq otn will be

  A net force F acts on a mass m and produces an acceleratio (/hwgbut/deyqda txt( /. ):3cmh-w on a. What acceleration results if a net force 2F act 3/(hwt/x qy/ w-)dtbcutmgo h.da (:es on mass 4m?

  If you blow up a balloon, and-8jpo,z xa .bj then release it, the balloon will fly away. This is zx,jaj -ob8.pan illustration of

  Two cars collide head-on. At every moment during the collision, /:qv-mcallvz:s( a ,u mm4/fwthe 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 aml au:,/af(svm:/lq v4 - wczmn example of

  If you exert a force F on an object, the force which the object exerts on yoe9p qrrj zq7-8u wi8pqr- 9ejrq 7zll

  Action-reaction forcrq,xr x;*tr q/es

  Action-reaction forcsso 0 1b-gw7ejes are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to c0o ( pwdpsa.l-9ib * o5lan/pthe car. Since a lot of damage is done b0 o-l9 lia sp(oa*. npp5cdw/on the car

  An object of mass m sits ont f*2n5ivrk+nxp+,vif +,vs t a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reacti2, + istv+r, 5pti*n+ knvfvxfon force?

  A child's toy is suspended from the ceiling by means :bt4 y5k/a:kgs,t qde of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," whatqt,dykek 5g bast4::/ is the "reaction force"?

  Your bat hits the ball pitched to you with a 15005 js+mrjpqkv2n1p2, wz:pcw1uxym;1 -N instantaneous force. The ball hits the bat with pv ;5x2zm,21: wr ypcskj1 q+upn jmw1an instantaneous force, whose magnitude is

State Newton's three *6f)e4d cysy ulaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of ihjyekrg :jw4c 6-u(1the following is true about the mass and weight of an a4:( uyewjcgih- rk1j6stronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a di q7* vatqfq uk;5w6kbdq7g,c7stance is

  Who has a greater weight to mass ratio, a person weijx)ig/vl .*iaqqx7jy: l r1o2e.cu3ughing 400 N or a person weighing 6x a.lure* 7i)oi:jx /q.lcugyjv1q2300 N?

  A stone is thrown straight up. At the top of its path, the net force actinkg4 g7yg*o /s6, ih/3odsev jsg on it ig/ gjiy3kdog,7s*6vh/eos s4 s

  A 20-N weight and a 5.0-N weight are dropped simulx+hwcx)4 ),oufa yv :mtaneously from the same height. Igno,+fx :cwux)4hyma o)vre air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respectql g+zd+ oo xpgp131(8azh2+ +orknghive terminal velocities. Whicoaxp2+k1(1hopz+ lgdg r qh+nzgo3 8+h object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of .x;*:mkky t nup9w)jy8b8:.ev j m mkgan elevator. The elevator is moving up at constant speed. What is the tensio.8 j;x 9: vkn*y ku8mt):mwjkym .pbegn in the string?

  An object of mass m is hanging by a string from the ceili.w,y*vnv3qth t fko7ob- 5/g z;dgo2nng of an elevator. The elevator is moving upward, but slowing down. W-,;no v z qyk7tbof5w*3nt v /dg2gho.hat is the tension in the string?

  The force that keeps you from sliding on anlm n6 w6vljl1y*)+crj icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to9lgats+iz1rg j;::x //n- pqeo9kr j w keep pushing it with const-je o;r njli9a// t x:w9pq+zr1g sg:kant velocity, because

  A horizontal force ac2-xk7i1scxz f celerates a box from rest across a horizontal surface (friction is present) at a zci-7sx2kx1 f 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 constae des53p8*gms 22u:i yblefn8 nt velocity. Thus we can deduce tha 3i5ue2snps8:8 ey2dmfl gb*et

  A block of mass M slides down a frictionless plane inclined s.lg07n : ut4datrdct /t:6+9vrbvalat an angle q with the horizontal. The normal reaction force exertl0tnur ./+bg9drlttv:tds ca764: v aed by the plane on the block is

  A block of mass M slides down ax4 sxfy641*,c nhnqyud1a2z r frictionless plane inclined at an angle q with the horizontald11czray x x44q6nysf*uh,n 2. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slideq 69 ifa/n8zx h ozg0mypl ,n7voj c03(th*bk;s down a frictionless plane inclined at an angle q with the horizontal. The grxi 39 06q;/8bmc0l7azh vf yhn(ktpgn*ozo j,avitational force is directed

  Two toy cars (16 kg and 2.0 kg) are releaxu q85g8dasno*a +ry )sed simultaneously on an inclined plane that makes an angle of 30e with the horizontal +g8qdu *)x8aano 5rsy. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied tf jozl29zo :jwaq5e+l6k/bqgi 4u4d x0 ji*9zo the object6ba+ l 9j5if zx4u/2g0e 4o*qwkjl9z oqjzd i:, and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s inq2n6i pukb;r f40bconi*p. w( 7.0 s. What is thepibwk no(p*q24ric.u6 ; b0fn average forward force on the car?

  Starting from rest, a 4.0-kg bodp fr6m.u8 dcz-y reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?up . dz8c6rm-f

  An antitank weapon fires a 3.00-kg rocln:;ek+9n, qjglg ny(ket which acquires a speed of 50.0 m/s after travelin9lqen,g+;jy l gn:nk (g
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 1o ci)e2.)hjm b0-kg mass from restbm)ie.h ) c2jo,

  What is the mass of a person who ww wx)3 vsqkkjenx7( 4u-pu)8oeighs 110 lb?

  What is the mass of an object that weighs 250 N on the gjr s s*l),chy)e:,l7;5pvqd;glwvy r - h6pz surface of the Earth where the ;s h;rvz,yp p ygljhe, vl s):5g7-*d)6wcrlqacceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is /xzf7hswtv 0.leo)x 2the mass of the object on the sur oxs7v zte)/ lxw.2h0fface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, anm* c.g8tvoh)- k*afjzqa,); jf8gc gn d object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the mjajc g;8 cvmh- f .)oazg*,q 8fg*tk)nasses of the objects.

  Sue and Sean are havinh5vxjy4 8 moh, aymm)+g a tug-of-war by pulling 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 Sue v8hymjy) xm+o4,h5am at $2.0 \; m/s^2$?

  A stack of books rests on a levw)-gd-ltp6w fel frictionless surface. A force F acts on the stack, and it acceleratwp-g6f)dw - tles 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 elevaa 5o9 9:uc/uysy kr9iktor. What will the scale be rea rsck99ou:9 /ukyi5yading 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 tbg.gd; :c zh2wrcznn pe*96r2he person is 60.0 kg and the ez*r9dc.6g c w:;pb2 2rnnh zeglevator 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 *d9r .q:wjorq 8ezw o+is 60.0 kg and the elevator acceleraterdo8*.q:+9qw ojz rwes 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 8.0 j;2t,lxch6ey1vuo x0ln2ue .N and is directed due north.enyxo c j2, xl21euhvt; 06ul. 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 truckf0 e+z9fv*w2eg)9vbw tc;l sx . 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 minimum2ftflz cbxs0e 9v*w;)+ewvg9 stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held invk-y1 i3k6i cc place by metal brackets that can exert v-3kicki y1 c6a 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 = 0.60 kq,v( k2hq dk .k m6n;cxktish1m u50m9g and m = 0.40 kg, what is the magnitude of the accelera0s,k m;qk(mmu .ih k9v1 26 ndcxtqk5htion 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 = 0.40 kg, what is-2nyaim: dz 3 k0nlt0n /,uxos the tension in the zi o-x 30nlknnd2 ty,m0au:/sstring? (Ignore friction and the mass of the pulley.)

  A student pulls a box of 55r3y wv qgwv(books on a smooth horizontal floor with a force of 100 N in a direction vw5q 5 3rv(ygwof $37^{\circ}$ 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 n ;t6wig*l2z1v)d(oe- kdjc l2c w+c xof books on a smooth horizontal floor with a force 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-jw)lo ;zte +kv(w6 idcl2cg cx1* nd2 is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 48k1 ,k1b ;-wvy6l f:zo*3hb tpznvcse-2. What are the tensions in thz tn-;*8sclpe 1fv:b,31 kkhvoz yw6be ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is-)dn 3/ifr *zln3 pyjunym8u- the mass of the traff np8lm-du u)r3-/f*innj 3 yyzic light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless surth21vv zasgh5j .wp/7r :8nu rface. (Seht5nrhs /zrw:.ua7 v 1gv8p2je Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact witew ,ub+ bl(zrauo/s *7h each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the+7a/ wu zb usbre,o*(l more massive box?

  Two boxes of masses m ajwx t51 yxyo4v9h)dm8 nd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting w18htv x)yyd9oj4x5 m rope?

  Two boxes of masses m and 2m are connected bqvk. r 0d1mf z9ijj c -q9pt-(ocqhp29y a rope. (See Fig. 4-4.) If the fr1.pq-cjtc9z9qi - j2hopk v0(md f9qorward force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as uc6;yqjg 9i6zshown in Fig. 4-5. Box I6 ;jy9c iqzgu6 of 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 frictio.7 no uot p.uc0pp-4 ..(injtq8ssgul ns between 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 th 4u .-q 0 s.uo(.tcp lnps.pnjt8ougi7e box?

  The coefficients of static and kinereo7n x h7ah)-tic frictions for plastic on wood are 0.50 and ra- e7o) h7xnh0.40,
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 +x22 bb4pmj+ dw3p:obcp direction. It slows and comes to a stop with jm342bpob cw b2pd:+pa constant 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 or.q *t45sjvmpytvdupe 27m5 5n a horizontal surface is pulled by a 5.0-N force. A 3.0-Nm.q5vj rs5d5p4 v7y tut2m* ep friction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-h z8:e -xrqw,ekg 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 speed ofzo/dr1 j y9th c9rz;2j 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between tj d9 rr9jz/2 1hytcoz;he puck and the ice?

  During the investigation of a traffic accident, police u0;, b ofh mk6jm uulk31(bgu1find 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 ou6,(fbm u1 mlbuh3 k01o;gkujf the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fibdu6zk+2w j g1; jax(e2e*krqg. 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 slidxujk2 6(qj+1 k2 bdaz;e re*wge 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.) The surface betwxyd 26tae i(h9n-l0tk een 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 mass 60tdtxy9l ( 2k-ainehive box, what is the coefficient of static friction between the boxes?

  An object is on a frictioscnm(.9c:f qtnless inclined plane. The plane is inclined at an angle of fcm 9q.s(cn:t$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat ldgvj 5 m27s*c uwb2w*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 wi.8un8 u0wudud th 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 ang u - zhnlef56x27lnw9wle 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 inc8t.qk)t trshw1ly:4mg +di j1lined plane, at a constant velocity of 6.0 mgwjy)l811t.t4idqm: sh +rkt /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 dow4z8m6q +:xadelsn/own 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 massw :36mdps64 gznutd8-6a cwvk 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 lo,lic915hu;zko oe0c jk b -pw6g weighing 500 N along a rough surface. The cable attached to the log makes an angle ofk095- hcwokpul 6czi o; bje,1 $30.0^{\circ}$ 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 at an k5 yk27s5v.g aqx99ix.d jrzkangle s.7dv .5xi2 z9jkq5kary xgk9of $33.5^{\circ}$ 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 on1sx6efi s0bo01nk-h.( btqc b an inclined plane. 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 frict.c-s6(0obq1b x1k eit0h sn fbion between the object and the plane?