Which of Newton's laws 7t 1giriuz.l,rt;wo1o bko/: best explains why motorists should buckle-up?

  When you sit on a chair, the resultansd 5t aiqk k9eju:9+2pt force on you is

  In the absence of an external forc* u: ncchnr65hlkj yfz01n1q ,e, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly t nw2vqm 56e39its5xvxurned off, while traveling in empty space, tv ix9x we23st5vm5 qn6he starship will

  A rocket moves throughov8;1lgaex7( nh( qic empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must l ;c(en 8(1q hxoaivg7be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fpdl q:ehkr5xwr ;n8+7 all forward. You can imply from thd5;rw er8l q +h7kpx:nis that the bus's

  You are standing in a moving bus, facing forward, and you sl*tu8 p ea30ffuddenly fall forward a l*e3pu8 0fafts the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an 5bo hsh5 oxez-r3u2p2ep18 khobject. Describe the motion of the object.

  The acceleration of an obje+nxzgrf+g ht q/g 1t-wl t/w00ct is inversely proportional to

  A net force F accelerates a mass m with acmdjkrkoh7 z, l25zl 80k) ;kin acceleration a. If the same net force is applied to mass 2m, then the acceleratio8 )jk5; l,72khrlim0czo zdkkn will be

  A net force F acts on a mass m and produces an acceleratio r.e )1jl y6k4v1xpcdzdel9mq )as) 9un a. What acceleration re1l 9d xpr9uk yc m4.qe)1vejl)zd) a6ssults if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balif-3 s38.81a x.eyrw ooyw4m8 ljvmw tloon will fly away. This is an illu8ea1 .jvlo 4 s.wf-rxw i 8tmyw3om38ystration of

  Two cars collide head-on. At every moment during the collision, the mc+tg895cl htjx46n r zagnitude of th9+ctnl5z46j 8tgxhc r e force the 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 whichb3m:9 rx5ictntc* g f8 the object exerts on you willfc ixb9gn3t*rc:t5 8m

  Action-reaction forcecr 7gzrkzi -:-s

  Action-reaction forc0sdx(u2 xo lh2es are

  A 20-ton truck collides with a 1500-lb car and s4ur xsll2e-surd7g 3 70/e racauses a lot of damage to the car. Since a lot of damag/e 7rx2ul7r4sgdrls 0 3ae-sue is done on the car

  An object of mass m sits on a flat table. The Earth pulls o2kdao* uuv).ijh ; s.jn this object with force mg, which we will call the action force. What is the reaction forcd.is j).auuo *h2kv;je?

  A child's toy is suspended from the ceiling p vlxbv87;7yenq4f z.a 7wg: dby means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction forcexgl7 :7db 84y.vpfa 7qzvw ;en"?

  Your bat hits the ball pitched to you withntv* s, uk,/iofjyj5i;*w ;vh a 1500-N instantaneous force. The ball hits the bat with an instantaneous, f,u o/*hjy;wi;iv*ntvk5 js force, whose magnitude is

State Newton's three laws.j7vuup7q+ ya(i* s fc1

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on.fyt *mx 5pp-w Earth. Which of the f5tm*-pw xp.yfollowing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distaf oey896vtmt : 7.qikqnce is

  Who has a greater weu.bt/ura(9*ytxxr *ijvq:2might to mass ratio, a person weighing 400 N or a person weighing 6 .2 ujtqyir*rx9bx:u( amvt /*00 N?

  A stone is thrown straight up. At the top of its path, the net force ac, po3j nja5jl0ting on it p3ojal, j50n jis

  A 20-N weight and a 5.0-N weight are droppeuv0lb ),s2 efod simultaneously from the same height. Ignore air resistance. Compare their accele2sbu)0v, fel orations.

  A brick and a feather fall to the earthprmur6wgz)/ +th)a cz7 xr* c4 at their respective terminal velocities. Which objew*/r4grc)p 6m)r7u+ x atzzc hct experiences the greater force of air friction?

  An object of mass m is hanging by a stri*jzrj9qcpr /5ng from the ceiling of an elevator. The elevator is moving up at constant speed. What is the *9rr5jq z/jcp tension in the string?

  An object of mass m is hanging by a string from the ceiling of an e-,ol4doubqftr:* q6f levator. The elevator is moving upward, but slowing down. What is theb6 oofrt d*q4,-l:fu q tension in the string?

  The force that keeps you from sliding on an icy sidewh*i 3ygzz qkc+ 9l2*u0/rvok aalk is

  It's more difficult to sta 9shs(z: qbus6rt moving a heavy carton from rest than it is to keep psbhz96q s us:(ushing it with constant velocity, because

  A horizontal force accelerates a+xwj 6klprvp6cu5/ y; box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and aljkrv 6/xw+6;5 c pulypl 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 inclip0es)u)w n h4y/51fshe plrh9ned ramp at constant velocity. Thus we can dedhnhf5ly0s )94) /uphpser e 1wuce that

  A block of mass M slides down a frictionless plane inclined at an angle ql4 /v h/ f*/cpf+vkkyp with the horizontal. The normal reaction force exerted by the plane on the bl hv/4k+vplpf *c//y fkock is

  A block of mass M slides down ro9qqtx2: sp r6/ y7yaa frictionless plane inclined at an angle q with the horizontal. The normal reaction forcp6aq9/ryo rqxt7 2ys :e exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incline48,wstom6pizfo7.eie( hk v4o l.:zjd at an angle q with the horizontal. The gravitational force isz:e i8op t.zo4sejlo( 7f.4v wm6k,hi directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneou wkbt02w;5 ambsly on an inclined plane that makes an angle of 30e with the 0w;2wkbtb 5am horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-Nwrgpm3.mi2cfs,8r3 3glmf i4 force is applied to the object, and it43mwgg23 plm3 rs .ifmicf ,r8 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 lrrb44 t*y;tiin 7.0 s. What is the averitl;*r b ty44rage forward force on the car?

  Starting from rest, a 4.0-kg body rc 7uv7q1* c7nr6qkch ieaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the q uq7* n767crc1vcikhbody?

  An antitank weapon fires a 3.00-kg roc-y+h.cz oe49crj kf4 s;yjyw;ket which acquires a speed of 50.0 m/s after ye wc4z -y+ hyfj ;;oj4sk9r.ctraveling
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 tr 0 ap; dnnqx,kt;x,0fnv77jahat you push a 10-kg mass from rest,nf0,; vka7 px;x ,r0dtjnan7 q

  What is the mass of a person who weighs 1i t.kqn0g4ms 2)xar+z10 lb?

  What is the mass of an objecll l)z(gam o 8qsri099e/ bv g8w5x zf02fv/lbt that weighs 250 N on the surface of the Earth where the acceleration due to gravi q(bog0 r 5zve w8gz9fxlbls/lm)0i9a/2 vlf8 ty is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on thf s/n;hwki i0646f7nvm 7sf6wyy(z ule 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 ts6v iw7f ;/k f6w04nuyy6nmlhf s7z(i hat on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the 8v 5lim mjr,5)z opec4Moon. The Moon's gravity is one8) cp,e45 irjlz5vmo m sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pull0d,cwix+xk/ 1 ph8qa xing on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean'h xd/wpa,ix 0 +81cxkqs force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surfaces5/ ;r)*wezn-1dz5zdvk adga. A force F acts on the stack, and it acceleratwsdz-) z/gdadz eak1*;vn5r5es 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 q k91jw mlh0.+dz qvy+N stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating dowlq kvy1+9wd z+.mjhq 0nward at $4.00 \; m/s^2$?

  A person on a scale riddj5d,-p g y jq/bp-qg-es in an elevator. If the mass of the person is 60.0 kg and the elevatydj5-q -d jgqbpp/-g,or accelerates downward with an acceleration 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 isudyz*fxefmpsr 6f. *l*,of-1 60.0 kg and the elevator accelerates upward with an acce6fzd* fx f soulfem ,r-.**p1yleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One forcfmr)1fmhnd83d pppno y;vv+nh ((v, -e has a magnitude of 8.0 N and is directed due north. The second force tnpm; vrp,( h18+ vdvnmn (h)yd-of3pfoward 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 plahr :*e0oq ol)rce 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 is not to slide forward io h:0eq*)o lrrnto the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held if1 hr6 cs6jpje93hsy d.) vkn2n place by metal brackets that can ex kn23 jsp6y6 ehrds1. )jhvf9cert a maximum horizontal force 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 anuf8 ( l(c7yzxsd m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and t8 lxc7(uz (yfshe mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0ap f,3te1c 6qa1.ujymg9fxs*ct;m 6 n.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley.)x ;9s yncapm ttq3f6m.,c1 *fe1guaj 6

  A student pulls a box of books on a sy/ 0skkh, h fo6c+nqlyygv* -7mooth horizontal floor with a force of 100 N in a diresfcgh67yklyyqhno +,0kv-/ * ction 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 u knqxtyw12qf:1xpc3 e,, a7u books on a smooth horizontal 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 is 40.0 kg,27pe ,c13uqaxyn :f uwq 1k,xt what is the normal force on the box?

  A traffic light of weight 100 N is supported by n2 7a2hhaj ng4two ropes as shown in Fig. 4-2. What are the tensions ihgnha 2427nj an the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is gbs pr4r1o9t9the mass of the traffi orb1g4s9t r9pc light?

  Two boxes of masses m and 2m are iwg7dlegoak::k3gemo9 zm *88( z:tte n contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleraeglm 87 g9k3:zo*mdetzg8( e ::okw attion of the more massive box?

  Two boxes of masses m and 2m aremg6,i zp hkiv.tb it:exl6 /4. in contact with each other on a frictionless surface.kiext6p4:t.6gi vl /bmih ,.z (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connec-zloy8sx :x ;iu eater d2-51sted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what2lxzt1da- 5ur:i ys8 s o;xe-e is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected bywd tz 3*)iig7f a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, 3it*iwg) 7fdz what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown inac emvzg 1*il,8m:8qv Fig. 4-5. Box I of cvimeqgm1vzl*a8 : 8,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- * lz/a)smvab.+aceu/ kg box and a desk are 0.40 and 0.30, respectively. ce mu/*+ bza).av/als What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and0b(6gngk yc1pj /d7lf 8(umpt kinetic frictions for plastic on wood are 0.50 and 0.40n6dbj/u y (gg8t1cfk7(p lpm 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 bz*jb,jva8 us.al b6 3surface in the +x direction. It slows and comes to a stop with a constant accelerav bu,.l6z*jab3 ajsb8tion of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting (i(tu-qs9*rh cvc( 2,t yusiuon a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction forcqty i 2rc(u9hi*-(v(t uc,ss ue retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerateb5 l3rqd3/ noipmrvfmgk,l *-yjq 5- )s 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 gib*g*zjvq 1 8rqven an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coeff8r qb vj**gqz1icient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, zs 6 v8yte krcwi3g;)3police 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 forzr8 gtvw;c36k)ys3i e 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.) e 9re /kv txwnfp35d11 pg2r+aThe surface between the more massive box and the horizontal surface is smooth and the surfg12t 1kn5p + x /3rr9pfveawedace between 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 Fighkg1a09x) v9 k0xcerg. 4-6.) The surface between the more massive box and the horizontal surface is smooth and thkvr1x9cge x09h0)a kge surface between the boxes is rough. If the less massive 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 playty0ga;xbn 5tnv e*/,ne is inclined at an angla *yt,e v/n;nbtgyx 50e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides xyi) a+ ;vny9xdown a flat 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-:bv rt c*nd ;vpz1lc r g0l7*xz-ckv, 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 inclinedyu xwp2y: (0f5/fhmre2o 592fozfyfx 2 r. ica 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 constant v 2 (3bj4/rnke nh(yknvelocity of b ynh/( vknj(r4ekn 326.0 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 m slides dow2,uo c8;w7 fsacpmcl1 n 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 ad rx*c)7jn.*98 m wsqtjlfl;u 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 atta.nubjqrzuvpqw :( 1j 0/*xrw7chedwj bw(0 un1r* .7p:xuzr/ qvjq to 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 frd8vhncp5 2 im/om rest on a rough inclined plane tilted at an angle of 28nhdvc/m 5i p$33.5^{\circ}$ 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 inclinl4ezgb o6l gxt()*9yked 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 coefficient of static f*( olt9z) kxg 4elygb6riction between the object and the plane?