Which of Newton's laws best explains why motorists should buckle4vo3z jg2b om/-up?

  When you sit on a chair, the resultant force )c6deh 7n:6piruz iy3on you is

  In the absence of an external force, a moving object frw + t4i/juwh-px58 xwill

  When the rocket enginec;qh6 :5lrephn vn8l * skvm.7s on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling ickemp :7 85vsnnl6 lv.h;qr*h n empty space, the starship will

  A rocket moves through empty space in a straight line hau/h) c2geeayw.k- ) with constant speed. It is far from the gravitational effect of any star or planet. Under these condc wg/hah-ea uk.y))2eitions, 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, a -am lj;1fuev* 5v5 uxsl+zs,and you suddenly fall forward. You can imply from u5 uj,1vs*fm;5sa-xzelva l+ this that the bus's

  You are standing in a moving bus, facing forw,8es t:ue r,cuyruoxv,sb: ,(fm:4g vard, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall fo4 uuvgefm,v ,: 8(seuc::st r,y br,xorward?

  A constant net force act ppl-bdyvv3n2a3v;smf 56 i 6ss on an object. Describe the motion of the object.

  The acceleration of an object is inversely pry-icosxvy ljno og/95(z e(t)-wu 45xoportional to

  A net force F accelerates a mass m with an acceleratieh(0c- *ez hcdon a. If the same net force is applied to mass 2m,zd( hcc e0*he- then the acceleration will be

  A net force F acts on a mass m and produces an accelerakz0;+ ip8ykbh xgkvffum:3 z 5k:so;9tion a. What acceleration result:s;z3pzfm y89xukkkb5 + ;hi f: gvk0os if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. T/qwandpb:/i k /j+4nyhis is an illust4:na/qp n/y wd/ b+kijration of

  Two cars collide head-on. At every moment6twakg6vleq 1rh/9c)+i 9 ekt during the collision, the magnitude of the force the first car exerts on the second is exactly equal to thtqeg kiv+hc96r19tkw)e/l6 a e magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F 3h.ex.iq7 gb8a2 vhbsqhj ;t 4on an object, the force which the object exerts on you wib x. 7 g24j3hthhqseiqb; va8.ll

  Action-reaction forc(zfoece ; 9)fov8 cr4nes

  Action-reaction forces arexey2ae*)du(r 5ilu cdj/89gv

  A 20-ton truck collides with a 1500-lb car and o ewq07z:b+,vq xoz- mcauses a lot of damage to the car. Since a lot of damage is done o o7qx0z+z bo vew:m-q,n the car

  An object of mass m sits on a flat table. The Earth pul1 hv;z:r hs0(y +x5xz23slqs f5eny xjls on this object with force sr1shz;xl eyn5h+(f2zsx5y j 3x: v 0qmg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from thzl mv7l w2s8 5l4d,lkhe ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this m 2 5llvl kwhl7z,d84sis the "action force," what is the "reaction force"?

  Your bat hits the ball pitched q xwkh7 )zulj0x,9jnh 51 l1jmto you with a 1500-N instantaneous force. The ball hits the ba7xqjlu jh591l)k,hj x n 1mw0zt with an instantaneous force, whose magnitude is

State Newton's three laws.0oy8zbq-1 ;eds.f azo

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth.njf i6oiy3: h6 Which of the following is true about the mass and weight ojh 6:6iy nio3ff an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distanrum+ f8-y6hu6xm w i9nudybt3 ux+i56 ce is

  Who has a greater weight to mass ratio, a person weighing 400 N or a per q,rt6 r jjogy44g2aa3son weighing 600 N? j roqaay46tgg24 j,r3

  A stone is thrown straight up. At the top of its path, the net force f9dr ph)ilj8;+)m nli acting on it is+ dm;l l9jfirn)h8pi)

  A 20-N weight and a 5.0-N weigw*ie -j1p; ;.2s0 mpky4 v9tandvb ybfht are dropped simultaneously from the same height. Ignore air resistance. Compare ik-yjbt2 n ;dymv1vp*b.s we0p49 a;f their accelerations.

  A brick and a feather fall to the eartnx6ick0ordx wo 8z 3vl8f *m./h at their respective terminal velocities. Which object experiences the greater formkcn.6f30x v8 8 orzld*/x wioce of air friction?

  An object of mass m is hanging by a strinip( vz9,g7hqfg from the ceiling of an elevator. Thehq,gpfz i7v9( elevator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceili*nh 1t blz:*7s6xztvgxu8zg 3ng of an elevator. The elevator is moving upward, but slowix3z :u1s 68vz* g7tzngl tbh*xng down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidz/f lv191s / sia1jstlewalk is

  It's more difficult to start moving ay. m 3 a1v:ku4dcfko cf0zb*f8 heavy carton from rest than it is to keep pushing it with consta 0*ma4u81.yov cfbfck:3 fzkd nt velocity, because

  A horizontal force accelerates a box from resfucx(/r l dxj6yzds2m+sv4+yn., ;z zt across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception tha r6d4uvs z.f,znm d(x/x+ lycysjz+;2t the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down+6 ;ay,irt(vqpzo4( ohj ad-xz9 bde5 an inclined ramp at constant velocity. Thus we can deduce t(j qyo v69dz,et(r p5dbo4 zx+aa-h;ihat

  A block of mass M slides down a frd- :se-w bk;wv-)wz bvf8k4lcictionless plane inclined at an angle q with the horizontal. The normal reaction force exertedb:;- )wvwl8sv wz -ekkdcb4f - by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle q wit: 4f+b xnlkvlt*u-s l2h the horizontal. The normal reaction fol l bk2nfxvu-t+l4* :srce exerted by the plane on the block is directed

  A block of mass M slides down a frictix)7lrf+ywn 3 8so18o d, osdfconless plane inclined at an angle q with they +713)nrodwx lcfs8, sdf8o o horizontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an 4:oxl7p lwm5 pinclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after5p7mlo4 xwp l: being released.

  An object sits on a frictionless surface. A 16-N force is applied to 2pnq-d2 iaab )the object, and it accelerates ai baa-p2)2d nqt $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 fvo ez (u f0mrr,h6* mf.yn/2fs. What is the average forward force oyf vnumf f,mfr.0 er2o6z* /h(n the car?

  Starting from rest, a 4.0-kg b/ x2 i93,cqw jomurlz)(m)eqxody reaches a speed of 8.0 m/s in 2.0 s. What is the net forcxq29)w/q,zxummre 3 jo)il(ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 *1rydz:x0bgew vl. 3jm/s after trjl zbv g0 :w.yd31r*xeaveling
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 10-kg mass zazz :b+vx( (mfrom restzmb(z +x(z a:v,

  What is the mass of f rwi5ig640jp a person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface s059l3:pyhv wn8wb(kq rq )2mh chfh 8of the Earth where the accelerationpyw fs8qw)9cr 2qh3(b l h5n 8vm:kh0h due to gravity is $9.80 \; m/s^2$?

  An object has a mass ofxr2,e:bb 2 1e,/at 5 w-ygxkjlzm3ixl 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Ee, 2 e rb:l1mx5wikt 2-3z jga/x,yblxarth?

  Object A weighs 40 N on Earth, and object B weigt -yuagd4hw60,x3 me ths 40 N on the Moon. The Moon's gravue h3dmt6-aw0gt4xy,ity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5 kkm nd 7k-q/a/ sd8cgp1d/lx).0-kg rope. lg8 k dqs 1p/c7k/na)kxmdd- / Sue pulls with 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 frictiq a6 gif-c71w ase6w5uonless surface. A force F acts on the scfa 5 6g iq7uwe-6wa1stack, 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 elevator. What w;klhd,vvm 9yhsxcp 6* lar+4:ill the scale be r:ard,l9kyvc v*x; s4p +h6lh meading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in a* *9*;yjscgg s. ti9f-uw: ufd skm.xen elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an ajss9-w dug*;ckt.*: fem ysxg.f* iu9 cceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale m ,r;-wdga8fw rides in an elevator. If the mass of the person is 60.0 kg and the elevator accerm-w;8d fw,ga lerates 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 1wkl* x (gz+4,nwkczhmagnitude of 8.0 N and ic kk(g4z1*h wnw+,xlzs directed 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 kjozs ef,6ijhy /;w-c ll4y/vrz,6 bq( g rests on the flatbed 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 i,fj4w6ze- b(yvy/ch jz, ols lr6 q/;is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of*s+uka da7 :)8r o+(jmion nqo a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When aoi r 7s+8k*)qu(nma:oj o+dnthe 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 4a.vj4hm)z2jwd ol .p= 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictiond 2.z ahj.om4lp)j 4vw and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and knk*, ymeb)l;5von:am c j7n09q+qv am = 0.40 kg, what is the tension in the string? (Ignore frictiabvkmqq: vl)e; 5n cyo+,n7ka9*m0jnon and the mass of the pulley.)

  A student pulls a box ofn/ nia94 gawb23ztqnc.tkypi kq (8a 24)uo/t books on a smooth horizontal floor with a force of 100 N intaqconbugn n/k.)aq 9iai/y 44k 8t2 wp(z3 t2 a 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 horo4 we4thn7myb9bh mnt v/2(r;izontal 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 iy 2 9;7tw(hbnmen mvrb/ 4o4ths 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 i0 q c +jv4izcd*jg2km3n Fig. 4-2. What are the tensiik +2g3z4q 0v*dcjjmcons in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what i qhi xj:wh1zyauhvd98 i0pf 3ca806y8s the mass of the traffic :y8d0zah whfac0p9ii8 1xjhq8v6 yu3 light?

  Two boxes of masses m and 2m are in contact with each othem6egexyn5o/ i -h: j3mr on a frictionless surface. (See Fig. 4j563enxm h/i:-egy m o-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 frictio, u:6;o wm0thr vih coa(9wrz0nless surface. (See Fig. 4-3.) What is the net fuhi9w,omvw at00( :c r;hrz 6oorce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If the 4yztym1z9jbz vg ;oy 4;+w 4evforward force on the more massive box is F, what is the tension inyzweb; ;gjvv y4m z y4zo4t+19 the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See08yazf :(gh lf rrv(b- q9pso4 Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of:z0a4brvh9 gyqpffl-o8 ((rs the less massive box?

Two boxes are connected by a cord running over a pullbz n*we 0w-i6xey as shown in Fig. 4-5. Box I of 0 ww6- bxeizn*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 1*a7x cpkhmze-)un.k *s8hde frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box .xdk7enh8mh p*z )ak-sue*c 1 when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 05vdo0 /-tfcz+*la emf.50 and m0f/acd*eolv+z t5-f 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 directio f3tl.kj1+ o-aso tk;g44nqzdn. It slows and comes to a stop with a constanttkn g4ko1ao z4;fql+3t-. jsd 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 ;x7o1e xz/ hffon a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of oe/x; 1fh7x zfthe object?

  A horizontal force of7 q8cb6yug7s+w/phmr 5.0 N accelerates 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 initipn(6 q *pzcopbmez8 8 4izs0r-al speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coeffic0 *n8zp6z pbs o zq4ipe(mrc-8ient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skxj.v (njlhe +ekdz4,2 7u/kozlb- ,l8q;m ihcid 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 car when tbe,c z +7d;kev/ilm, zqxo4ujh- 8l.jl2(nh khe brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The,t mp3)rn4djrgdg 7: a surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive bnarj4: dptmrd7,g 3g)ox 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. 4-6.) The suf/jd hx/-la88*19dj/sl pyvxr.vlq zrface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massivf*x/v8ph lya z dr.l/jl1j qd-x8s/9ve 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 /g;qrqj:y f;z*5j8t:ejs,iw g 5 xlwnplane. The plane is inclined at an angle of ;zws jq /5rf,ly 5qetjgg:nx w*j8i:;$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes a0etg vr;,tdq4 n 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 rz;pv( 2ybcw,udkh8s9t h/ m.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 ):utubgl6 y w f5y,u0ginclined 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 inclig5pj(a sbe sfa98d5k(ned plane, at a constant velocity of 6.0ke bsjapa955s( g8(df 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 roa+49 prlv- yeough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slida.eu kct/r8f bp( )r,des 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 az wd9cs4.4dx 5gl0qu u rough surface. The cable attached to the log makes l5gx49zwqdsd.0u 4cu 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 iw6j tqn;*h;z we3.*avjcfga2 nclined plane tilted at an angle of *fn ga;c e2wzt jawqh6. 3*;jv$33.5^{\circ}$ 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 v jrkenxrp9:h3+ ) +zron an inclined plane. The angle of incline is gradually increased until the object begins trz+e:9rnrk3hjx vp )+ o slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?