Which of Newton's laws best explains why moto9 k9;z4 s)fbq i3wdmc/iaxy3erists should buckle-up?

  When you sit on a chair, the resultant force on you ixr)av5y 5 tyw;s

  In the absence of an externr6,hj -+zl 0v wvtjf9; 5.iwrvg/buaeal force, a moving object will

  When the rocket engines on the starshipd 6lux;b db;f8 NO-PAIN-NO-GAIN are suddenly turned off, whilefl 6d;u8bb;x d traveling in empty space, the starship will

  A rocket moves throughlpbq f.p:l8 1h empty space in a straight line with constant speed. It ispll8: p .1fhbq far from the gravitational effect of any 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 n8kk*(n4js4ybzxrjtf)3x 9m hs r /*ga moving bus, facing forward, and you suddenly fall forward. You can imply )zsnns4 gjj38h/kbx fr*tr9 *xy4m k(from this that the bus's

  You are standing in a v2 +8swlin(,tq24-zpe/ 0wmdmiemnl t k1y 5kmoving bus, facing forward, and you suddenly fall forward as the bus comes to an immediateitkd +vwkmp(wy0slznn-/meq ,leit52m 2 81 4 stop. What force caused you to fall forward?

  A constant net force acts onz *4i;g/p( blg,i htyra0cj9g an object. Describe the motion of the object.

  The acceleration of an obovhcj0si3 jx7z*z6k ee4 f6/j ject is inversely proportional to

  A net force F accelerates a mass sex74zq-:cq d (x,3wamqr4vp m with an acceleration a. If the same net force w4qqc4p q,v7sa :r(-3zxx med is applied to mass 2m, then the acceleration will be

  A net force F acts on a ma0fdzn+f+1 qrwss m and produces an acceleration a. What acceleration results if a net force 2F acts on wdzrq+f+ 0 f1nmass 4m?

  If you blow up a balloondjn xa6k*91 hxheo,0v , and then release it, the balloon will fly away. This is an iloa1jv6,exkhdx 0*nh9 lustration of

  Two cars collide head-8ylau mb6 yqyxa817l,on. At every moment during the collision, the magnitude of the force u18y7y ,qaaxby lml86the first car exerts on the second is exactly equal to the magnitude of the force 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 yh(g7q pk (ov*f/tfab0ou wiqvfpf hg to0* a7b(k(/ll

  Action-reaction forcye( :y6qe,nezes

  Action-reaction forces are bvwe575ip nf,x;j6u j

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to dkuua0 bo tx.80up;m+the car. Since a lo kbao uux;0+0 um.d8ptt of damage is done on the car

  An object of mass m s zna7nquhlwy0.0f x ;5its on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction a0 uyz flh 0wnqx7n.;5force?

  A child's toy is suspended frou.ouu 1ce+v-m, y*ntxm the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "act. eut+x,yvmu o-cu1n*ion force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneou 2ssq/9pbzvkv*t 7)o zs force. The ball hits the bat with an instantaneous force, whose m9sb*to 7qkv 2/vpzsz) agnitude is

State Newton's three lj8cgb8)b m1o laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon t7 t t5-ly tpydl; *il;be:3liehan on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon'sttyi;3*;5 7 bl- lypd :elleit surface, compared to Earth?

  An example of a force which actst :y(ui.--htzj7khjoo r(ky6 at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N zilzp ,g hyq+ +wd)-o5or a person weighing q+z)g+dhy5 l ziw-po,600 N?

  A stone is thrown straight up. At/y:vjbik8u (efmzm;;oim , y /i3zw g1 the top of its path, the net force acting on it juymeo mk3 ;(ymb/ ;8vgii:wzf,/z1i is

  A 20-N weight and a 5.0-N weight are dropped ta4 0+job6-zo yz)uhosimultaneously from the same height. Ignore air r0+4z 6hyotba j oz-ou)esistance. Compare their accelerations.

  A brick and a feather fall t-z(ff2ng (q.oaw* p0ve c*pvvc1b3tgo the earth at their respective terminal velocities. Which object experiences the greaterw e(n2v10* (v g* bfvg3oca-cpzf pq.t force of air friction?

  An object of mass m is+1bqe n6rw3bhuvn/ ;s hanging by a string from the ceiling of an elevator. The elevator is moving up at constant spe;n/hue3q bn1sb+v6rwed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiliu8** eh,:7xq tyav5wtnsin -kng of an elevator. The elew-u:xn8e y *vnkihats,* 5q 7tvator is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sgb ( qf*ztb5eox: je+v,rx4+ ridewalk is

  It's more difficult to start moving a heav up.r) iz)rhimjrm69 ;y carton from rest than it is to keep pushing it with constant veli 9.m6p)rzmrriujh ;)ocity, because

  A horizontal force accelerates a box from rest across a horizontal surfady yie.vj;w m78 ))qance (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 doubledy eqyv)j.m;8w) d 7ani. What happens to the box's acceleration?

  A packing crate slides down an igza) tlcdl/2sy4e 2aer1t5 0btk 1 oi,nclined ramp at constant velocity. Thus we can deduce /tleo2de i z50a r2)tk4 cb,gs1 at1ylthat

  A block of mass M slides down a freidq 4 8naos i,le)0 uahh901g;w (rdaictionless plane inclined at an angle q with the horizontal. The normal r1g ( lr)is8a4,9 uh nqawhid;0eao ed0eaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wd1a5+ll x2gtzbis 7 ,zith the horizontal. The normal reaction force exerted by the pla,x i2g+b zlta 5lz17sdne on the block is directed

  A block of mass M slides down a frictionless plane inclinedc4zs+5- m t2qgi hyzl- at an angle q with the horizontal. The gravitational +tyimghcs2 4 zq5--lzforce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultanfyqb-n) zb-+deously on an inclined plane th +bbfdn q-z)-yat makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appli rzil-ad o2/9yy-s+w5 kpzf9aed to the object, andop5-2rz zk9-w9da+ asifl/ yy 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 inpar2g4e54u l6zctsi9 7.0 s. What is the average forward force onulri zpa69eg54c st24 the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 l l;fx3ib q5zmxni 7*t3*5mcct7ysu /m/s in 2.0 s. What is the net force acting on the bby;x snftiiq*/ m 7c355 ux37mz*lctlody?

  An antitank weapon fires a 3.00-kg rocket which acquires a spu j+qo:tvul0-eed of 50.0 m/s after o+uuj0tl -q:v 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 47aqiims0u .z with the same force that you push a 10-kg mass from rest,z0. 4 imu7iasq

  What is the mass of 57zs+ odpiyg; ov. wx... uyvwa person who weighs 110 lb?

  What is the mass of an object that weighs 28 fxay bu,6h+c50 N on the surface of the Earth where the accelerat+ucab x,8h6fyion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on thel u5sd(q 9nq*c Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is oc9u5ql qs*nd( nly 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on t4af ).vr3y1i;r a9pcwwu) azbhe Moon. The Moon's gravity is one sixth of Earth's. Compare the massevfpwa 3 c; )b wr)ir14.zyaua9s of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends-gm7p i utt)8jrss 2livh-n)- mb /)fz of a 5.0-kg rope. Sue pulls with a 15-N force. Wh / b)l-tms2-i)-up) nfz mghsv8ti7jr at 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 acts on th8xpiog(l+ vl,c b5 m6msp r:+le sirc5mp8,:m+ll6s v (+x obglptack, and 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 in an elev,b2w ass5(b tfator. What will the scale be reading when the el b5,bt(aswf2 sevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an ele,vd do)9wdax2vator. If the mass of the person is 60.0 kg and the elevator accelerdxad, v29 dow)ates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridj 3s ciud)5y3ges in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration o3y dcs)5 gu3ijf $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forcej25yfka(vo k( ;bx9ijs act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the accelervkkbi;x(j( fy5a j9 2oation of the mass?

  An object of mass 6000 kg rests on the flatbz0a n/n9( auhjt8hq )eed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whan/09zaenh)h(qj 8 tuen the truck is traveling 15 m/s, what is the minimum 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 h n9zxr6:dt/: cjm 5b;gi ncv)xsfa n9-eld in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is t; v/s: ixzc:xdt j9)cbrfng6an-nm59raveling 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, 6cb3 (rfhflq9if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Igbf (f36l9rqhc nore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kp( k o2snf-.zgw j p3v)j,cy5cg and m = 0.40 kg, what is the tension in the string? ,onk.gz2s-jfjc p)3v cp 5(yw(Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smootj ,r:a( g:chl ldc:g0mh horizontal floor with a force of 100 N in a directionr::lm,c :0h ggacj( dl 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 fg)a ,-bu48 r b-77 dxvajjlpcvorce of 100 N in a direction of 37.0e above the horizontal. If the mass of t7b) vd7 -bupa,a 8v ljjcr-g4xhe 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 yvcgfq*d x3u09 sbezb3 m+ 8;fFig. 4-2. What are the tensions in the ;m *90 cgbyfzbesx33d+f8qvuropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass ofkf/w;+ovkjl 40l0kv /:xwu hd su3 8en the traffic8v0 fol d3;s:e/ uwkkxh ujvw nkl+4/0 light?

  Two boxes of masses m and 2m af3yg0wiz ogl3gl a j3q 81lw;8re in contact with each other on a frictionless surface.l l fyg0383w;jz1qlgio38gwa (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionle7i .(ov m-j2 j/z*nqyhtzazw: mov7;t ss surface. (See Fig. 4-3.) What is the net force on the more massive t ya (tj 7.zq2hz; v7*v: omzmw/j-ionbox?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If th v9,zd tpg1rxlj o6x: gv:pa25e forward force on the more massive box is F, what is the tension in the co vt:x2,rv1lagojdgp596xp :znnecting rope?

  Two boxes of masses m and 2m are connected by icp-fa 6 pc4o)7jn9cwpjz7:eu:l+th a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acce-4e phtjlwj):o npi 7f:79pc+cca u z6leration of the less massive box?

Two boxes are connected by a cord running over a pulley sx vzgu -)509wdirtid u ckg fr/.c63)as shown in Fig. 4-5. Box I offdi) u5sc g v/w3r-9)k 0drz gux.i6tc 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 between a 3.0-kg box and a dgzcl:ukshg5 p uyo/w)43p,b/esk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force puou:4lc/sh )gb5ypz/k w3g,is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are;4i2(q rma lbq 9mhhqp9:9rj y 0.50 and 0.4jpma9 9mqb2r q l:ir;(q9y4hh0,
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 +2go.u2k;,gato,z nr5-a urg wr * dywa level surface in the +x direction. It slows and comes to a s gw,-,o2.+ gwoak;* uunardrt z2y5grtop with a 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 on a horizontal surface is pulled bt 55i ztw9c61ur*wjx iy a 5.0-N force. A 3.0-N friction force retards the motion. What isj9xiwt5 u5r ic6zw*1t the acceleration of the object?

  A horizontal force of 5.0 N acogs+ 9 pc0brh-u6.zxt;m*ep vs 6 1hmncelerates 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 speed of 10 m/s. It:4h31,m0ahja g bq w .n;aesch slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?:wgnsjqa0bhma4 h., 3 aehc;1

  During the investigation of a traffic accident, police find skid markslvbcf2bdwa cq6b,d(95nj0* z 90.0 m long. They determine the coefficient of friction belnvd6 5 (w,c9cbb af0 djzb2*qtween 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 sl q co)(yin1a(urface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box d)l(a ocy(qi1 noes 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 F bzywp5rvi,v e.u)4e7vlrn/,- u4l ) ohfg* omig. 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 box, what e44.lp7iu ,l/ywrfov ),o)5nmvze u-ghr*bv is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined y/d5ba6b pgt j: )buu0xk4fu 1at an angle of uug1)jup 60f5b:b/b xyd 4ta k$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill2vdp8v-q lq5d 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 with an angle okcutif *h 85b9f $37^{\circ}$ 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 angle 5t2 jglw5mbxkgg,owt 8z6pp+4 wd ;d+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 ehowvq4 + k2 n*jb/nd5cub1l0 constant velocity of 6.0+1j /vku b54owl0qnb2nh*dec 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 do;mmhh* .qn- y +/y2ku0rfqhbcwn 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 mass 4hwv3 .rezj6c 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 a )rby0* dgk h91cnyhzk0h)h3 fttached to the log myhny00 h*zchb rhk fd193)k)gakes 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 at an anpxo9v2+glu, ugle ofvpo 92u,x gu+l $33.5^{\circ}$ 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 zlzv wrt;:y(: 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 the r wv:;z(:ytzl object and the plane?