Which of Newton's laws best explains why motorist g/mx3/zy0 qjds should buckle-up?

  When you sit on a chair, the resultant force on c./ja;hohm fv62 z im(you is

  In the absence of an external force, a movpvsw/q)8bi 3t u ,*w nv/zmmy/ing object will

  When the rocket engines on the stv a.+n, 8a8ckaj+kebnyt5 mq+arship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty sp c+,j k+yk85a eam qnnva8.+btace, the starship will

  A rocket moves through empty space in a straight line with constant sp*5fse0ehk-e sund)u/i1axjf ij/ 3l , eed. It is far from the gravitational effect of any star or planet. Under these conditions, the forceuike05f fs deahex),l u3-nj/1 ijs*/ that must be applied to the rocket in order to sustain its motion is

  You are standing in a md2 lcbcs;3o n 9 *x/8bcm0loguoving bus, facing forward, and you suddenly fall forward. You gs;n cclu o 0cb/m9ol 32b8x*dcan imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forw0u4goe:itxr vw6i3 0rc 4 t2fq0 ivb4gard as the bus comes to an immediate stop. What force caused you to fall forward?fvtgc 6rtwev420ox0ii 34 :iqb0r4 gu

  A constant net force acts on apti:pkv o97q kzfq +:kp7m0 c-n object. Describe the motion of the object.

  The acceleration of an object is inversely proportionaxo 4w d18cvgec:qp xp5 /d-go/l to

  A net force F accelerates a mas* lole.0 gp1c xfzf4m*s m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration wi*x *41 m0zelo lc.fgfpll be

  A net force F acts on a mass m and prog3l (5gxj,y wnduces an acceleration a. What acceleration results if a net force 2F acts o5(n y,3lxggw jn mass 4m?

  If you blow up a balloonm)1h bb1ddn- b/7wzefu(k: dx , and then release it, the balloon will fly away. This is an ikz1/de)b-udhb 71f wn (d:mxbllustration of

  Two cars collide head-on. At every plq,uc,ef3uy ssz8h der -2/m* c3oy+e6h 3ek 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 second car exerts on the first. Tzrc+33- 3u e*f l6d8 ko ,ps/ycs uyqmh,h2eeehis is an example of

  If you exert a force F o-023m k pjrw;.rhhidon an object, the force which the object exerts on you willhhd3mo- 2w0rr i j;pk.

  Action-reaction forcescy7;vbpjzve9 5y3- t c

  Action-reaction forces vtx ; xhioe*ql+( m0e5are

  A 20-ton truck collides with a 15 flv 5sp 2.,bqcndoa c-(wn,0u00-lb car and causes a lot of damage to the car. Since a lot of damage is nb. o vs2unw,c0 plac-d,f(5q done on the car

  An object of mass m sits on a fq+libj .1xat4 lat table. The Earth pulls on this object with force mg, which we will calljix+a 1qb.4t l the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. tiw56 ,zs/46rbt(sqc u1y lm/(dvqqiThe Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is th(bq6i/y lsswi/(qtd,1q r mut65zvc4 e "reaction force"?

  Your bat hits the ball pitched +(cb7oyj ug8 jto you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, who7b ujo (cy8jg+se magnitude is

State Newton's three la1miztg b;b o3i -fr80h 7, irhc,bzym0p3b+oiws.

  Mass and weight

  The acceleration due to gravit35 vtd-openb8 sv +y j27ztvu2y is lower on the Moon than on Earth. Which of the following is true about the 82-pby+ 7vd 5vut2tjn3ozvsemass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whicv pqr4*zof*32 hvdm 6kh acts at a distance is

  Who has a greater weight to mass ratio, esbgl70ju0z6l o96ffa person weighing 400 N or a person weighing 600 sffu lje7g0690z6o bl N?

  A stone is thrown strab:j0nkg 2 v7nbight up. At the top of its path, the net force acting on itnjbgbkn2 v:0 7 is

  A 20-N weight and a 5.0-N weight are droppes l,cey97 /8umcbmpa +ybz0 0id simultaneously from the same height. Ignore air resistance. Compare their acceler0y8e0pz/ycam7b+ ,9 l smcbuiations.

  A brick and a feather fa5ox 54b)0pqhtkh ( zjsll to the earth at their respective terminal velocities. Which object experiences the greatert50hh bp)sjx4 5(zqok force of air friction?

  An object of mass m is hanging by a string from the ceiling of p0gj+bim+1p ;zvm5n b an elevator. The elevator is moving up at convni g pm zj+m1+p5b;b0stant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of u0/p s xn yekd0/ii0lm+ /3txtan elevator. The elevator id00m//l ptistye+uxnk0 i/x3s moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from slide6v yl 5ea5xuas8;d+p ing on an icy sidewalk is

  It's more difficult to stl ;douhld9jq bkc;++1art moving a heavy carton from rest than it is to keep pushing it l c;db1l jk; +h9du+oqwith constant velocity, because

  A horizontal force accelerates a box from rest across a w6 9z3: kdo+ azgmprg47w ify4horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force :9mgwkyg+a4fd7z6 rz pwoi43is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocitt8)op gm pq79yy. Thus we can deducp g8mp 7qot)9ye that

  A block of mass M slides down a frictionless plane inclined at an angle q wihagios4i3-jaz l3 /1ith the horizontal. The normal reaction sih3ai4 ja1liz3o/g- force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclin;9 ugio.c 0ptsed at an angle q with the horizontal. The nocpu ;0g.is9 tormal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inz/j,bjwqf v-wp 2)q)rclined at an angle q with the horizontal. The gravitational force is directed)q /w)2fj,pzj vw-bqr

  Two toy cars (16 kg and 2.z d sgd;p5/bf+n7y /1rmil6,fmqc jo50 kg) are released simultaneously on an inclined plane t;f,y+p7/md s li 5/m5qzjc6dnb 1ofgrhat 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 applied t+e e+cqoqxe 3- a4-byoo the object, and it accec-e4axe o+oqbe q-3+ylerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from ret pl 74xo 4-brufav-s, 07brlzst to 27 m/s in 7.0 s. What 4op 7 rll4u07rta,bb -xs-zfvis the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. uznw u9f(96yrhqta*c + 0k/nb What is the net force actinrubcnw yh t+ 99q/0*6azu(kn fg on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed k,4 fogluiq8 :/6htv zof 50.0 m/s after traveliq :guo tv84/,lfzh k6ing
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 massrhlmdm .f+0-q )hli 0b from rest,) +-h.h dmmfqll00 rbi

  What is the mass of a person who weighkn ; 5:oo/opwis 110 lb?

  What is the mass of an object that weighs 250 N oh;r)wx mg8:w(5.li a60i;vqxnslr n kn the surface of the Earth where the acceleratlvx:isr qw i6 ;8ahgklm 0)(nxr.;5wnion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the masph uj6 u.468r*c2ba fe iicz3xs of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on theh4jc.f bur*ax c8z pie636i u2 Earth?

  Object A weighs 40 N on Earth, and object B weig murn6vl31 xqv*f-vf: hs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the 3fn v6qx:ru*mvl vf1- objects.

  Sue and Sean are having a tug-of-war by h 9zk4dl7fh8t pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rop t8l7d9h hfk4ze accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on.ij: j h.nd,qt a level frictionless surface. A force F acts on the stack, and it accjjhnt,d: q. .ielerates 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 c- 9ylr+j;b) tbdae 3nN stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downwa3 tjbc-anylb;+r e9d)rd at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the masnnl.ohz)4s 2ewvb/2bgz 6 yv6s of the person is 60.0 kg and the elevator accelerates downward with an acceleras2z6wg n/4l)v2zne6b. v hbyotion 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 60. (nk 7f;o,rlii0 kg and the elevator accelerates upward with an acce( ,7f irolk;inleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act ow+uyb v1ic j +5sv85vhn 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 is5b +vv8viu 1sc+wjh y5 the acceleration of the mass?

  An object of mass 6000 kgba a8 xki)trjut*8z); rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizo8) k u t*)trz;a8xbjiantal force of 9000 N. When 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 t :(b c x3eq(qg4ckos6rm q.p)ahe flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. Whrq4c :p3 )ba(q6o (ks xceg.mqen 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. t qdee28pwxem*kt-4*03g h uo8kc w8h4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of thet388 d kwewktege *mqpc-*u204h o8xh 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 jjbb(b)yqc 3-k7t kh6idk,d0 kg and m = 0.40 kg, what is the tensdkybkbk3j,d)0 j-qi76hctb (ion in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth hori3dmo8+)wtln2 vu:gjk zontal floor with a force of 100 N in a dir: gldm82t o3+kvun j)wection 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 horizontalei4wmzh.p+jw+g g0sa1z j 0r ; floor with a force of 100 N in a direction of 37.0e abo wa+wz 1;h0sm e0pijj+.gg r4zve 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 supportei8 kg diyhox :a12e.n7d by two ropes as shown in Fig. 4-2. What are the tensions in tikx:o ndge.1 8 yia27hhe ropes?

  In Fig. 4-2, if the tensions in the ropesameae,1cr 04p are 50 N, what is the mass of the traffic aca4 m0e,pr 1elight?

  Two boxes of masses m and 2m are in contact with eacha)rlo ,z5-kcp cxp+ g8 other on a frictionless surface. (Se pcp +-5,8xk lrzaog)ce 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 friit:r3 ;gda72f st *q:t:qbyimctionless surface. (See Fig. 4: fqy q:ttgb iatmsr;i:d 7*32-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See ys3 l ea/bwp4;Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in tw e;p/ a3lbs4yhe connecting rope?

  Two boxes of masses m a36evtghhcwv bx6p.;q0c u1 i/ nd 2m are connected by a rope. (See Fig. 4-4.) If the forw.e ; p3c/gvxh wqu06 vihtbc16ard 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 pulle4cm3ae2ah o4n y as shown in Fig. 4-5. Box I of ma n4m3 ce2ao4hass
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 staticcsr6)bl4nf pdq; z.3if )wwt( vi7hds(jr6x6 and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is thenwz)fd ib7 j;xd. 6twr(l isp6rch3(sqf 4 )6v net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of statix+apiulm2 7g8wkk8(jc and kinetic frictions for plastic on wood are 0.50 and 0.4g8 xwum(72 +ia8ljkkp 0,
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 c/-w mu0i3r1h,c+sd w2seuaahomes to a stop sa3w+acehu0ir 1u 2,hms-wd /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 by a 5.0-N force. A 3.0b gzk:2 8b48rr had0pl-N friction force retards the motion.r hpabrbl4 2d8:8k 0zg What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg11)yu zqle+yb u)4 aib 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 initdgk+xtzvf5*9q ez8f4 ial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?8zvf9x5*gt4 z+k qedf

  During the investigation of a traffiny,betj: l r;*c 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 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were aebr: ,tj l;*nypplied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betw q(n 7a/xh6b 5h ualbuo2:pnh;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 massiven/oa (b5 2:hxl 6hhnuqbu7;pa box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. kjyn xz4,/g:n4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mxz, :g4nkjyn /assive 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 plane. The plane is inclined at an angl;geabf2e ii//yr( e pyr1sv 24e of a2ye/(g2rvsy1ie;pfb er4 /i$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anglwvx/ 2a ;7ic7 y/wigfwp.r0aoo.wh h /e 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 pla 9ijc0dsiuj 2,q4h9o)k . clsdne 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 smyucg 5.m 7ec0r8yipa:ooth inclined 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.kb- nn6*zbw+f x/pkr inclined plane, at a constant velocity of nf.bz/r b-p wkkx6n+*6.0 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 mo/g 9vsw)z/d.ksi jx6 slides 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 rosy0 czobx )1;eugh $37^{\circ}$ 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 attaax (4ye31 0q7hvjb ikoched to1hakoi(40j qeyx7vb 3 the log makes 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 t( 4poy/hh i/ yozmdx8,ilted at an angleo z( phyd8xh4 my/o/i, 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 inclined planea7p*gm37 eic v. The angle of incline is gradually increased until te p 3cma7giv7*he object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?