Which of Newton's laws best explains why mp2mnq cst;b-s5j0wi 1e0;l krotorists should buckle-up?

  When you sit on a chair, the resultant force on you isp )x,vvtx) dk i/1-tll1syufd )1zqj(

  In the absence of an external for 2uy8m(+uc0yl xq trpx27-un pce, a moving object will

  When the rocket engines on the starship NO-nm4p,8(nw2co f3rzwe 2ms9ti PAIN-NO-GAIN are suddenly turned off, while traveling in empty4( oz2 s3wp8ewnc fn2rtm 9,im space, the starship will

  A rocket moves through empty space in a straigzcr /s++eqg91 ( su mh-/axksxqtt kj*a -.kn(ht line with constant speed. It is far from the gravitational effect of any star or planet. Un(sth*z ks+9 cakx/skm- tre/- .q( qujn +xa1gder 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, q6bos90f 7x rwfacing forward, and you suddenly fall forward. You can imply from thifr7xo sb 6qw90s that the bus's

  You are standing in a moving bus, facing fxro; mkk/ fc7uqz q6:ir73fa*orward, and you suddenly fall forward as the bus imkx767c3qoa;r fzk /q:*r fucomes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Descri dz29hl8my:zx;.r nje be the motion of the object.

  The acceleration of an o)p3 y x i3xtn0d9yk/tvbject is inversely proportional to

  A net force F accelerates a mass m with an accelera,-pq w2zj+ rcrtion a. If the same net force is applied to mwjq,rz 2cp-+r ass 2m, then the acceleration will be

  A net force F acts on a mass miftp*9w( : 6t pejxqj0 and produces an acceleration a. What acceleration resulp wq6p9x (ti :*tfej0jts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then re-)0zh5( jejc,hskjzulease it, the balloon will fly away. This is an illuzsuj5j 0k (h)z, h-ejcstration of

  Two cars collide head-on. At every moment during the collision, the:2rz+f z :hjng magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force2jf: hrz z:ng+ the second 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 sgp *qa -s8y7cwil87 sqa*p-g sycl

  Action-reaction force,fy38 cqt9z9xnl cwv -s

  Action-reaction forces arhv yi3rqvcv h5rr7,twq5. ,9e;r :c rhe

  A 20-ton truck collides with a 1500-lb car andnzs /u z 2f;7pjde9(ki causes a lot of damage to the car. Since a lot of damage is donekd9;zpijs2 zu(7f/ en on the car

  An object of mass m sits on a flat table. The Earth pulls thr,o0g bsp vmtm k.5;gw (v);vb))ra on this object with force mg, which we will call the kt 0b)w )obv pmr.r)g;vmh5 ts,g(va;action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of apetm n-)no)uj 2)g/au string. The Earth pulls downward on the toy with its weightt )g 2)a/jou)p -mnneu 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 1500-Ne 2ze 8xfs5.h3nv 1oms instantaneous force. The ball hits the bat with an instantaneous force, whose mfz 5o82 xe. 3snhemsv1agnitude is

State Newton's three lawc-bh 0 u1 t.op*ldhzevvuo. 88s.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Ear*s txtjof7,iq b:qr. r1 9(qieth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared t(.otqrr:q t,17i9iqexbfj * so Earth?

  An example of a force which acts at a divn2n iur 3aw0ssb 3f.3stance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig ped)vw top3h 5t-4u/ifc*9x ghing 600 N xvh/)95-4 p*gdpoc3tf uw eit?

  A stone is thrown sto9am0f+n u b7qraight up. At the top of its path, the net force acting on it+ fuon09 qm7ba is

  A 20-N weight and a 5.0-N weigh +ixff5i d+i5ct are dropped simultaneously from the same height. Ignore air resistance. Compare their accelerat5dx +i+5ifcfiions.

  A brick and a feather fall to the earth at their respective ci9d, o)s/ jhgmyiq )/terminal velocities. Which object experiences the greater force of air fricti,cmgji )ho/9qdiy s)/ on?

  An object of mass m is ha1p4 9u ,u;raza d) c fxo)*bukyaci)t*nging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tensi9,rb* 1d;ya*)xto4uukfi cu)a pcz)a on in the string?

  An object of mass m is hang22 i.) hfrjtoaing by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What 22oai. )trfhjis the tension in the string?

  The force that keeps you from sliding x,(qv4zxwzb4 on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to klbl+f2 j.r) *k t)4dn9 lwuoiveep pushing it with constant velocrlk vj2 tu 4).9fndlw*lbo+i)ity, because

  A horizontal force accelerates a box from rest across xw e jf;ee2;0mnd:t0ca horizontal surface (friction is present) at a constant rate. The experiment is repeated, and al20x;;efee0n cj twm:d l 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. Thu(*(omq bb42,pp (qx 7e+peapy s4gvro s we can deduce that+mg a((pe(p4ro,ov ysxbbp42 peq*7 q

  A block of mass M slides down a frictionless plane inclinet13ftrrjwjgn48p 61i d at an angle q with the horizontal. 34p6t g1fnij j8w1rtrThe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q iugzz2 kx 67t4with the horizontal. Thz7u4k62 zixt ge normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionc 5re,/zeyt* bsds )5vless plane inclined at an angle q with the horizontal. The gravitational force is/cs5tdbeezy5) s v *,r directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneouslkzg73vky+ a (ry on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whrvy+k(zg ka37 ich best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to gf *8) +c)ugbv8 csulnd b(+imthe object, and it accelerates at bbig(v++8dum sc nu8 )g)cl*f $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/sk w gztvx-f( a)f*dowvohew+ /m1*, 2l in 7.0 s. What is the average forward force vkw +awtlv (o/ w,m-*d2o f) f1ghxze*on the car?

  Starting from rest, a 4.)ty:avxni3.x t3n )vgki ,l2 r0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is tr v x),3kyi n v)i.n2gaxlt:3the net force acting on the body?

  An antitank weapon fires a 3.00-kg rvj 0 prd1ok j:be+d.i-tvf;t i,tj(1wocket which acquires a speed of 50.0 m/s aft-edj fit0pw1:oj v1(d ttb,j+r;i.kver traveling
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 thl g.r6 a:p,p lcvjz g*,yzok66i8c)ioat you push a 10-kg mass from resopl,6c vp :i6l6*acjy g) z8zrig,k. ot,

  What is the mass of a person who weighs 110 lb)yu a- zp;jh0x?

  What is the mass of an object that weighs 2 hw*h6ja668hcy0f0, s8ep0gisex +ded ,x t ee50 N on the surface of the Earth where the acceleration due ,8tp6 sh0e+6g0y0 s8c*eejxhd6fe , dhi awxeto gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Eart7*( hz2rps gn/fwy riv v4**xm y.at-hh. What is the mass of the object on the surface of the Moon where the accelera *vhv*znhirp/*2( wg a4 xt.y7mf-rsytion 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 thc 7afa09vlr; je Moon. The Moon's gravity is one sixth of Earth's. arv lfj90;7ca Compare the masses of the objects.

  Sue and Sean are having a tug-of-war 1gh(df.6qinhe gq2ea q dyr50kf1 7 ct)/bqh2by pulling on opposite ends of a 5.0-kg rope. Sue pulls wid f gi/6.qh5(e1h )2q7 crnqhdbe20fyka1qtgth a 15-N 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 frictionlesqpdmu 4,-1)xgwpkv a 8s surface. A force F acts on the stack, andvu8p 1x 4- pgm)aqk,wd it accelerates 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 i v1j npx-73o,i qz+zhen an elevator. What will the scale be reading when the pxi-oh3zzv+7en, 1q jelevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If tsaq4a* ec n9,phe mass of the person is 60.0 kg and the elevator accelerates downward with an accelerati c s9eap,nqa*4on 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 e l7inkwea.6p7clk4 / 60.0 kg and the elevator accelerates upward with an acceenw e4 /ka77l.p 6likcleration 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 oc .g/pnqf8,vdt aul53f 8.0 N and is ,u nf.3t8q/ alpc5v gddirected due north. 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 is held in place o 8f iwnz(k8q+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 ozfwn+8(8kiq is not to slide forward into the cab?

  An object of mass 6000 kg rest,k3sb / ;iysdts on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal forskyd 3ib s,/;tce 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 kg and m =/kf1bcngwk2 ; 0.40 kg, what is t1k/w k g;fb2cnhe magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4(: xwj*mgg k,r-1, if M = 0.60 kg and m = 0.40 kg, what isxmr (gw, :g*kj the tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of bbc.vm49sxt f8 ooks on a smooth horizontal floor with a force of 100 N in m8xbvtc .4sf9a direction 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 f/ag+gl93ow(e 7 zhiiz loor with a force of 100 N in a directii9 ho3ag(e i+zwl/zg 7on of 37.0e above 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 showbi 6i,;uw* fbye-cwm6*gl 4h f*d8vl an in Fig. 4-2. Whal* gim*v-6d4 fybweh,8awf6c*l;b iu t are the tensions in the ropes?

  In Fig. 4-2, if the tensions in theo*)alb yo0 rb8 ropes are 50 N, what is the mass of the traffic08a yl orbob*) light?

  Two boxes of masses m and 2m are in contact with each other on a fric22/+k mxnkvxv1fiz c.f3yf q; tionless surface. (See Fig. 4-3.) What is the 2n/x1f+xkf3fz.q; yic m v2vkacceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with ear;6j-hu/ 6b.y) hgdvbq6an cwch other on a frictionless surface. (See Fig. 4-3.) What is tu66r;dc h a.-6jqv)y/gwn bh bhe net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope vh5di4+t x)c/d /yyuy. (See Fig. 4-4.) If the forward force on the more massive box is F, whatx5)+id//y 4hyvu dtcy is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4dg68plu- evnt .l s/q8-4.) If the forward force on thes8lqn.pd/8 g 6etl-u v 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 showj8 xddmnm36x 2dg5 3 v8hx65rt8wsayyn in Fig. 4-5. B88d3a 8g5y mxhdwnj65 xtyvr3smdx 62 ox I 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 frictions bqwyu*dem n +o x:,e1,ukgbl/6etween a 3.0-kg box and a desk are 0.40 and e we: 1 m6u*/lnbo,y+dg,qu kx0.30, 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 ucg/c3 hc rh1gi9j6 5ion wood are 0.50 and 0.40,1 3j ggh/ richcc9i5u6
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. It slows and comes to 7hn-43ig t0yg yf5io ya stop with a con3y5yt fi47o yhi-gg0 nstant 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 srmhyf+8/ a4 fa ah8/t9 0yh7dwwm rnn5urface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the objec w0n8r5wnyfry aat4/d 97 8+/ mfhhhmat?

  A horizontal force of 5.0 N accelerates avae2 .ep.j::qeo b(ii6p 3zax 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,k8fwtz- s t;y(u m0yq4 a puck is given an initial speed of 10 m/s. It slides 50 m onyyuft; ( wk84tzsq0 m- the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police fiiw m2;)dmyw :h-nbjwq)h *j)dnd skid marks 90.0 m long. They ym)*dww nq-i);h2jbw j)m:h d 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 car when the brakes were applied.

  Two boxes of masses m and 3m are str f ,muuqf0 l(+zjh(5.d-j pcaacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface betweer(, uj+f j5dmlcf 0a-hpqu.z(n 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. iy .: f-a0szc mgpa,15o.fc zu4-6.) 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 box, wha pfaa z,- s1i5o g.zccmyu.0f:t is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plan ..ni7qytvef3 hgum8k9(y- fte is inclined at an angle (efm73y. tif-v.nuk q8hy9g tof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that ub2tmd p7y6e4pqoj0;s: *eq / *ghr hzmakes 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 itgd7jtfdf/ m7:4v gv4n azo n1s:5xv9nclined 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 inclin9c6;t -nvpigw w)fo l(u:qse7 ed 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 plane, at a cons pm.i*,qf 7j1sln. sljm)oj9l tant velocity of 6.l.lsli msqfj)*9mo 7njp.,j 10 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 roughb0gd*ab x7gaa(,q s vi(u .2gftl4jk3 $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m; n q-fdur(ao* 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 5q;ijhiee ;h ;700 N along a rough surface. The cable attached to the log m qji7i;; e;hheakes 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 rou :vbm vnm2e1 pea6nn 00nh2r;qgh inclined plane tilted at an anglemna :01enn0hnb vqe62v;2 r pm 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 inclin1f 7031s tw0e3 epqp qkjou3bned 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 coepfq0p1 qusno3 0ew37k j3t1befficient of static friction between the object and the plane?