Which of Newton's laws best explains wmp2tmu 7hcx5pnij7e 0 ew9p+ -hy motorists should buckle-up?

  When you sit on a chair, the r.qa1fulk dy kd )xx18e.dqw5: esultant force on you is

  In the absence of an external force, a moving v/d 0:o vlj en3x0zj1eobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenl hc(jq2r(-dtxw y7,uie(t n:+c caj -uffj5r;y turned off, while traveling in e5 -i jh,frcqw +(nrcje(x f2y(j;dt u:u7tc-ampty space, the starship will

  A rocket moves through empty spacep9 xog.1bwq5x in a straight line with constant speed. It is far from the gravitation15 9wqxpo. gxbal 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 a moving bus, facin tb;oa4b9c pvw9)vdwjv(6;i ng forward, and you suddenly fall forward. Yb6 )b w;(i9cpv9jdnavt; o4wvou can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you s:v(hrhj* p 4i fhxmke,ri ;)x.uddenly fall forward as the h,jm:).p x4fihi h ;xr(re*kv bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an objeclhhx+pw1l zdao(6d- . t. Describe the motion of the object.

  The acceleration of an object 7h:vmpck-y)06zmvcs+p ke-f is inversely proportional to

  A net force F accelerates a mass m with an acceleration ai:pd2v 9hq 1p(vzja3-un 3wzq . If the same net force is applied to mass 2m, t v(un2 qa:q dpj wiz3v1ph3z-9hen the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What ao7*sxa+36y a hx8c rxmcceleration results if a net force 2F acts onhsay x67+o x*ra8mx c3 mass 4m?

  If you blow up a balloon, .b 1 cwpacjizz+ hbz182u cz.*and then release it, the balloon will fly away. This is an illusz2 .wab c8.ju 1cicz*bpz+zh 1tration of

  Two cars collide head-on1 p1uau5kv 19 grqsmcpp6 qh(/. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the secona/g r11kquqmv h 9p6(cp15 spud car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the object exertsyj;3bcuyce ;; 6. bwvc on you wi6;eyvycjb;c c w. b3;ull

  Action-reaction forces6yj5i5 wimo .d

  Action-reaction forces qjcicurt*(*n 7)3go d are

  A 20-ton truck collides with a 150j6ayl 1s80avw:xw: hh 0-lb car and causes a lot of damage to the car. Since a lot of da::l1h8 h0jx sv 6waaywmage is done on the car

  An object of mass m sits on a txdw+-tcpxy,cx1i5 n/y3;skl4ufu 1flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction forkxpfy-is n1x/ dxuty;c+3clt5 1 ,uw4ce?

  A child's toy is suspended (.nn*slyb.v)x p;5x g.ovvntfrom 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 "action fxtb(ngn.vxy n.p)sv5l;o . v*orce," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. x29imarogy*f1 6ngd,.d4n tw The ball hits the bat with an instantaneous force, whose magnitunm4gx f6* i.2 yw,dorgnt9da1de is

State Newton's threez:2w3 )k;z.ahe kyms)+:pdlxuw f+ uc laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of thl n vp85buto9dz-j)hveq qb+s0oz-+5e following is true about the mass and weight of an astronaut on thsho8 eulnq+ t9zbd b+v-z) -qjv550 ope Moon's surface, compared to Earth?

  An example of a force wet 5l tol+,v,nxj1v1 xhich acts at a distance is

  Who has a greater weight to mass ratio, a person g ybi7/3:vq*qoqy-yeweighing 400 N or a person weighing 600 Nv :oyygq/iy-qq* 73be ?

  A stone is thrown straiguky 7th+ i8kb,-eb8ghht up. At the top of its path, the net force acting on i-hiebybhk+88k t,g u7 t is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same helm6xh 4 izlspj; (i8.bight. Ignore air resistance. Compare their accel ; s64h(.lbizjim8xlperations.

  A brick and a feather fall to the earth atli-ba iwx 0,ldd. 7m:k their respective terminal velocities. Which obj b07d ,mikdl: x-i.lawect experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. T r3zxslzmv9n,b5vf 1c8 tge92he elevator is moving up at constant speed. What is the tension in ttsc v5mvzr9f2 3z1glbn, 8x9ehe string?

  An object of mass m is hanging by a strins q )j204m34wfp7;ps tderfqwg from the ceiling of an elevator. The elevator is moving upward, but sloweq swt4 q4rpdwf0s;3j 27mpf) ing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidej/mowo5a (t a0- 2vdiuwalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep,w25 ni0;n cbzhagal- pushing it with constan- g;,52i0a lzhcn nwbat velocity, because

  A horizontal force accelerates a box from +n. 3k )iuq;6iqux*h nbwcqtu ,v-l6frest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with tqk)6lu ni3,+w 6fu -qhbqxcv i.u*nt;he exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant vel .2(os+ hx.njq.nqnjxocity. Thus we can dedn2. ox(shnxj.. qjn+ quce that

  A block of mass M slides down a frictionless plane tdj9f(m7e8e a1 0 y6pitv6msa inclined at an angle q with the horizontal. The normal reai0tvmta pe8f66dym9 e 7s(a1 jction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an axc,hsmq6v l:o4k+o , angle q with the horizontal. The normal reaction force exerted b k:,xc o+6,hlmsv 4qaoy the plane on the block is directed

  A block of mass M slides do0 jesnf0i ky,6wn a frictionless plane inclined at an angle q with the horizonj60ek y0 ,sinftal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclinedudw pl /tw-2z/58f8e pvemku 0 plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after beinp-0 8e 5 wz2 tumlu8edfvw/kp/g released.

  An object sits on a frictiondk xeqg06q1 -cless surface. A 16-N force is applied to the object,6q g c0kd-1xeq and it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accel z8;odq angd0jmk1l/ ,+etg w (f5s8inerate from rest to 27 m/s in 7.0 s. What is thesf0genl q/ng 8 (dki1tdwa,;5j+m 8oz average forward force on the car?

  Starting from rest, a 4.0-kg body uc0 dz+28 i0kvajfm0d reaches a speed of 8.0 m/s in 2.0 s. What is the net for a0ivd8 djm c+fu2zk00ce acting on the body?

  An antitank weapon fires a 3.00-kg rh0cwr8j: v,xlocket which acquires a speed of 50.0 m/s after8xrj h0vw :l,c 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 th:usspfbv psl3 r )(,0kat you push a 10-kg mass from resp(r0vsl3pkbs:s) f ,ut,

  What is the mass of a person who weighs 110 lb?3;3 -fq.sm4b5ipz 3+mbr yw(n d kfden

  What is the mass of an object that weighs 250 N on the surface of the Eariem6hnsvo xvyk*9 -+:th where the acceleration due:y 6okvxhi-sm nv9 *+e to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What 8tskbgllz508vwk*v 1 is the mass of the object on the surface of the Moon where the acceleravlsw zl5t 8*gv81kb0ktion 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 My 6u/ao xaib1cx 9 hur4z8c44yoon. The Moon's gravity is one sixth of hiocba ya 4 y91/48zx64xcuurEarth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0-7xg 2aw -j br6bmg0bh-2d fiv5kg rope. Sue pulls with a 15-N force. What is S0275x6grv aimhbbwb- d 2-jgfean'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 aa 4c,/gs9wg)-h;w( zzu s6 ldq1cp wiwcts on the stack, and it accelerates d( ;l/g94su)6,zw awc-wh gz1csq pwiat $3.0 \; m/s^2$. 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 will thej6h z+zx. d(nu(hmosg/*v-tc scale be reading.jut*n zsm-zdxh(go6v +/( hc 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 the 1tn;moa9g v 4qperson is 60.0 kg an m1qvg9a ot4n;d the elevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides 5d7 *mb 9,mz./pma psj)vok gmjmg5w*in an elevator. If the mass of the person is 60.0 kg and the elevator acceler5,w5/) .mgm*g9jbjam m vkp*ps7dzomates 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 haf: ,usuw-o3g fs 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 accelerationwsf,uf -og: 3u of the mass?

  An object of mass 6000 kg resfr lbb l l8j6*)s/;zxgts 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 tr*lllg )bz6sf ;/xjbr8 uck 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 2g-n(8ql lb5m w 2euukis held in place by metal brackets that can exert a maximum horizontal force lm2gku8 (-uelnbw q25of 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 ;asl5u/q b 6:cfgvmqh+w1 *mpkg and m = 0.40 kg, what is the magnitude of theuc;sw6gv*/m p5 : a1bqhmfql+ acceleration 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 vq9 /5u0us o tfs)lqx6and m = 0.40 kg, what is the tension in the string? (Ign sxuq0q6l) u9/ovsf 5tore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor wgfr y-*bn3 -et1ge t 2zg*0bcnith a force of 100 Nyg n *c01t-z*en gef-tbg3br2 in 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 horizontal floor w;hp. knn4n x*tith a force of 100 N in a direction of 37.0x. ntn nh;*p4ke 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 weiw87.cjddd- 46atzacfe s. w( jght 100 N is supported by two ropes as shown in Fig. 4-2. What are the ten8(sw4f.ac dzadjc.6e7 jtw- dsions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the tkhu i7 5,fyw0ts6 jjp:rafficsfpujkt h,07wjy65:i light?

  Two boxes of masses m an4 f g )pakef6z21nn 9(1jdfv3rdhjkg4d 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bo 6f23zpa ngj n)4k1(d1ge9kr df4h vjfx?

  Two boxes of masses m and 2m are in contatxf ur*p(7bb, ct with each other on a frictionless surface. (See Fig. 4-3.) What is the net for rx*b ub(7,tfpce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If thy4 joyvbxb. w).,xva1 e forward force on the more massive boxjyo)a. bvv1 x4bw x.,y is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. ge6wwvo *jy+(a1uk:4e (j vxg(See Fig. 4-4.) If the forward force on the more massive b(eje *( ggwyxkv6:w+j1 avu4o ox is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pz g;mgir :.h ejt2ys-0ulley as shown in Fig. 4-5. Box I oj2 0 imhsty; z.-:erggf 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 des;0-)he9 1ajw sdm ophik are 0.40 and 0.30, respectively. What is the d h;-901mahi) opjs ewnet force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wol1e1a wqv2 7giod are 0.50 an27l 1a vgei1qwd 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 surfacesqs(do u2u;-f*k yn8pbs0 e6n in the +x direction. It slows and comes to a stop with a constant acceleration o u8nyofkn2ps 06edus ( ;b-*sqf -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is 1grc r / r(q;l,db9invpulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the objeldvr;9 (nb,gi1/qc rrct?

  A horizontal force of (;62kvqfpoprhkf 6q 8vp lcs* *ih/*i5.0 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 initial speed o(k. 3,cwq z-sgdlsyz( f 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puckcsql-( w3.(szk zgd, y and the ice?

  During the investigation of 4: nvtgdf5 sns6,,k;wx /qjhha traffic accident, 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.s ,w,qh4/xnd; fs hv5kjn6:tg 500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacay(i/2szo 0k zvlvg69ked. (See 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 box,9osyk/ 6vz l2i0gaz(v what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (Sea:h elizmhp f+*1 8w4rf5l+f-c ls1khe 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 mo1wl+k z84:ml esf hi-flaprh +c15*fhre massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclined at ay.tby.:mte 3fn angle.fy tbm3t y:e. of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a f s6 c,09cqfhkoofr/u, lat 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 with an a a*+qtc:t c1jpkmt3,53 a kysvn9 glw-ngle 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 ths. 38dq.w elzilted 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)8d8e kfai:ou t95mjmw: d2rd f)t o4f directly down an inclined plane, at a constant velocity of 6.0 jf)9 5od8d:)a dm2 twoief8u:mkr f4t 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 slideza3 ;,y*p1eb:axg 2f u3 smetws down 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 m slides down a roq98y (d nlq/98 . e;h ua/mvtkxllgpi1ugh $37^{\circ}$ 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 roughwf .26dt2ktz 1ng8gzz( tl ,9qh w8ksh surface. The cable attached to the log make skh2gz9, 2 8fwnkwltd.qhzt6( 18zt gs 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 tiltsmn2fdc(x 40ird 2nl5 ed at an angle of 0csnmnd2ir dl4 2 f5(x$33.5^{\circ}$ 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 i.6w 8tyochw4on an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs iwh4c 8.yi6 otws q. What is the coefficient of static friction between the object and the plane?