Which of Newton's laws ba7q-,w)n- nxe20g:wt cdxyq kest explains why motorists should buckle-up?

  When you sit on a chair, the resw ijq;x2pw4 4udvoh2vk(e02 v ultant force on you is

  In the absence of an external forcjhbhnp7rec/ p4,1q f,6zvs 9 be, a moving object will

  When the rocket engines on the starse2*jbgtn j.5yhip NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship 5.t ny*ejbg2jwill

  A rocket moves through empty space in a straight line with constaai5pd. 9+sf9w m,5k *dzlfd dwnu, f:vnt speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force tha.nzdm +u9 w* df5d 5:f,fvdsilpa,w9kt must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facin0+cf.i;co jjc9y b i4r)v.mry g forward, and you suddenly fall forward. You can imply from this that the bus's )4mj+.j0rc;yfi. civ9 ycorb

  You are standing in ajzu8zm6za(nl veo p u7t)11 l. moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediatz )nv8pulmu6 7azz t(oj1. l1ee stop. What force caused you to fall forward?

  A constant net force acts y3wll5x(yq4a on an object. Describe the motion of the object.

  The acceleration of an object is inversely pny8) s2kyx8 vl y 40qtcw5y zwdi2(/piroportional to

  A net force F accelerates a mass m with an aciwlt) (+e ks6hceleration a. If the same net force ews(t +i)h k6lis applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleratioz f4.a. a vy*8eqgnx8bn a. What acceleration result.avqgnx*. 8befz ya48s if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly dcy-+tq . .fm qzkr-u)away. This is an illustrat-f).qmu -d ytq krcz+.ion of

  Two cars collide head-on. At every moment du3 -/w:r ddv 2gaitx.gplewy32ring 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 thgxat:drwey pg3i3 2l /vw .2-de first. This is an example of

  If you exert a force F on an object, the forc-ek4fnw :z3bla*mo / me which the object exerts on you wief4/ okln- b3wa*zmm :ll

  Action-reaction forcewo0os5ugl s1,6 lz.w ss

  Action-reaction forces arb xhksw5 2 k-k(s gu5q9*qle;ie

  A 20-ton truck colli3vf qylynq; *p;1 6peydes with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage ispq3 plq6 feyy;; *yn1v done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object wi zgn.u*7hl:pd th force mg, which we will call the action force. What is the reaction forcez. 7lp*gun :dh?

  A child's toy is suspended from the ceiling6a0 gz4oyxrnt3qh+ v)5 wq t0t 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 force," what5x6zh+04 tvw)tt3qra 0gyqon is the "reaction force"?

  Your bat hits the ball pitched to you with a 15u x3cpa yqb4 er7(ntjukn.276 00-N instantaneous force. The ball hits the bat with an instantaneous foren2a.t uu 6b3c7jkyxpnr4( 7q ce, whose magnitude is

State Newton's three lm w4bvcq 6ruah:8jg+ ) ,6fmwz lj9p+swnv(c 9aws.

  Mass and weight

  The acceleration due to gravity is lower on theuj6pe-ep0b (/ooc fh6n5 bw5 l Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Ear0lo /ocnb( eu ejfpp65-5hbw6th?

  An example of a force which acts at a 62eh9i ktki*+ w6yi ec96du;mvd 7zbvdistance is

  Who has a greater weight to mass ratyvy1)06,rj 16oy. vrsv yrwxtio, a person weighing 400 N or a person weighing 6v)0r 1xv6yr.yorj yy,stwv1 600 N?

  A stone is thrown straight up.rv(kg qfl8jabrl81 ,f-x n j2p81yg.z At the top of its path, the net force acting on g,bqa( lp8 fvny-82lkr 1gjrf8x z1j.it is

  A 20-N weight and a 5.0-/r6 df z)w-sjwy,adt6nae r+(N weight are dropped simultaneously from the same height. z,y 6+jd wf d)rw/-aaen t(sr6Ignore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respectivgher.ed7 4 iakl0z*+6w dt7s ee terminal velocities. Which object experiences the greater force of aid re 6 +ahtik0 *.ee7g7d4zswlr friction?

  An object of mass m is hanging by a string from thm/rk nv*3hh c)j cj2 7kuk9n:xe ceiling of an elevator. The elevator is moving up cj9h kuj 2vnrkm:ck 37n)h/x*at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string f ji /.ybbyd1ui*n; h7erom the ceiling of an elevator. The elevator is moving upwarbjy/hu y.bn* 7e ii;1dd, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy vg)l0rz 3mie* sidewalk is

  It's more difficult to start moving a heavy csiz6hh ptjh2we;d83-b/m 1; t+djk uqarton from rest than it is to keep pushing it with constant kjtdhs8;2dmzt- 36 ; /+ij pwh1hebuqvelocity, because

  A horizontal force accelerates a box from rest across a horizontal surm bix3 5qor2(u t,a0vcface (friction is present) at a constant rate. The experiment is repeated, and ala,2tcv( i mr05b3qox ul 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 inclined ramp at constant velocity. Thu8uq.p8zd; b(k jiuk*vs we can deduce thk; zbk jqd.8vi8p*(uu at

  A block of mass M slides down a frictionless plane inclined at an angle q witp2 zeh.ift+:lh the horizontal. The normfhp. elitz +:2al reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionlelbwjs bzhrsax tj m+(o67k f9+v(+c25s z .k(ess plane inclined at an angle q with the horizontal. The normal reaction force eb.v7 6hjzts++(5 mkas j2(fw9z ox+(rceblsk xerted by the plane on the block is directed

  A block of mass M slides down a frictionless phpxxm6rtv 1/4pn 0w.3-tu mhjlane inclined at an angle q with the horizontal. The gravitational force isu.x/ -46p3 w0rvjp tmtxnhh 1m directed

  Two toy cars (16 kg and 2.0 ;,;rz x elo1a/ hl;xbhb6g 0skkg) are released simultaneously on an inclined plane that makes an angle of 30e wixes ;6, zba obk0g1lh; l/;hrxth the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. zuc9t;gy uv/+.9tt)4mqr xyy A 16-N force is applied to the object, an/ zq9.;utg u y9 rtxtycmvy4)+d it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerat 9i 7d:epchelab skqm16 10:lce from rest to 27 m/s in 7.0 s. What is the averbchmc k :96aed0lsel17 p :q1iage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a spqhm: o6jt-gj7eed of 8.0 m/s in 2.0 s. What is the net force acting on thj67j h-toq:gm e body?

  An antitank weapon firesia7is4jb s2k2 a 3.00-kg rocket which acquires a speed of 50.0 m/s after travelin 7bk2 ja4s2iisg
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 mad:n*w8yvsw xcul ;)r*ss from restnsyuwr:x l *;w)8v*cd,

  What is the mass of a person who wea-829u(f2i appjg20rukaixnlxwe * .ighs 110 lb?

  What is the mass of an object that weighs 250 N on the aup p yx*u prufk)0:*:surface of the Earth where the acceleration due to pk)xu*0ufp :a:py* urgravity is $9.80 \; m/s^2$?

  An object has a massc-h4n 85emqcl of 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 -cn5cmle4q 8h only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Mnne,c gd-iq)k6v nv -9oon. The Moon's gravity is one sixth of Earth's. Compare the massi- ,-9d n gnn6vkecv)qes of the objects.

  Sue and Sean are havin4zyhq 6m/atzc + fx9c9g a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force ifzq xha4c c6/t99mz+yf 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 tndds:sxj*j )g:,q . aihe stack, an.)x g*dq ,jsjdis::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. Whazex)za :- y6nbt will the scale byaezn: x 6z)-be reading 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 person is 60.7 pdnx3cx-8bz0 kg and thep-d xnzb c83x7 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 in an elevator. If 1ru:djjm( *,n ie5/f lo ,qk+dui:uq5wzbsq- the mass of the person is 60.0 kg ae/ if ru-(ik5,w+qq:d*,jn:ouz1bldq m ujs 5nd the elevator accelerates 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 forp npui:- j; 62xtmcgj(ce has a magnitude of 8.0 N and is d(tp pm;: cgn j6u2-ijxirected 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 /hgvd 2z/j: lqkg rests on the flatbed of a truck. It is held in place by meta/ hl: 2d/vgqjzl 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 into the cab?

  An object of mass 6000 kg resttaz6;k ,zz7 o7ynw;r 3frf+:rc :gbr hs on the flatbed of a truck. It is held in place by metal brackets that can exert w ncy+:h6:3t,7;afz;z or b7grrfrkza 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 and m = 0.40 kg, w+zc2 :yvhmf2s 28kezyhat is the magnitude of the acceleration of the system? (Ignore friction and the maf2yycm+ve h:kz22 s 8zss of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whae v2 :xql:hc1yt is thx 2yceqv 1:lh:e tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal flje .l)fvr,ngu -p4h,pgo7ma-t o4o1loor with a force of 100 ropa1hlf4 tpjg 4n,-)m 7uoolg .v,-eN 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 with a force ofs8rn p.t9bnevif2 +-v 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the bookpf +tes 2-9i .nbrvnv8s is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two rope7kz s f:0neygnqx37d85 ebqb ,s as shown in Fig. 4-2. What7d50qk7 b xeyg,e8sbf nq:zn3 are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what (qyghtqtc1 : gy.on85is the mass of the traffioy(h: gny 1ct58.tqgqc light?

  Two boxes of masses m and 2m are in contact with ea+k/dnfc 04xn yhhx2 d9ch other on a frictionless surface. (See Fig. 4-3. f9d +nd2h4ch/nykx0 x) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a fril+c k;l3ure*t 3 (ln:luxqy m*ctionless surface. (See Fig. 4-3.) What is the net force l*+*t 3mrcxllu:e3nukl q(;y on the more massive box?

  Two boxes of masses m and 2kfh:8 jt6 eq(yo,vu0ym are connected by a rope. (See Fig. 4-4.) If the forward foe:6q0 y khvo(u8fy, tjrce on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connecj+ yrj5u 9qg:*bnulr8ted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleratib*jqj9lu g+8n u:rr5y on of the less massive box?

Two boxes are connected by a cord:g f20zyclos :wf/ ry- running over a pulley as shown in Fig. 4-5. Box I of mawz:/yf2log cf-yr: s 0ss
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 stati;;0ar2e.fcztg w8p l fc and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectg;t 0 ; .fpafw2lezc8rively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic fricti l),yn mic8geu(;s(v+olu wp9ons for plastic on wood are 0.50 and 0nlu9(w;+vpg)e (is8l cu moy,.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 sur7w iy qeiw,z+py 1:gq1face in the +x direction. It slows and comes to a stopzqy :,+ii7qpy w 1ew1g 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 j4di wr6p.88v-v,ksaeyu s e (force. A 3.0-N friction force retards the motion. What is the acceleuwkver8i jv684,-y d sse(. paration of the object?

  A horizontal force of 5.0 N acceler vtd7e)kgearc8i-el i p/s,26ates 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 givenr/zhok6qs. 7 ucx-1ss)n:wnc an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinet6qc.-: rn/)w kz sx scu7o1hsnic friction between the puck and the ice?

  During the investigation of a traffic accident, k1t s6e,hax-, y4tsh qpolice 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 braa- ,tth,4kqey s1h6sxkes were applied.

  Two boxes of masses m and ; jq w,nmcwgc04 xv+nk3x d:*ei82mgl3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes igvwkxc ,g2cm0dwnq: ji+; e m43 8xl*ns 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 Figfsa*1pr9u()p/yauz0idw hnc )k zjv(ab ((b *. 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 ((k/wzb *b (jp 9a*h1p0zus(rvn ia ))ayfuc dis the coefficient of static friction between the boxes?

  An object is on a frictionless incli anu) hs6exc.py*/j* nned plane. The plane is inclined at an angle of a/uhxcsn* y6np* ej).$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flatz s-ak lk5q26bre 7um: 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 s yuw lj.b2r x1wt4n/4;x7xzoe, f1sn 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 inclined plane tilted at bqjga;u1wlgga1c,c+j n 3 68pan 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 dowcqra5olc:p +k0 s- g4qn an inclined plane, at a constant velocity of 6.0q4ac- :0lq+ sckg5orp 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 3r(k3o;kaz y nrough $37^{\circ}$ 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 0vby5ai c+-tf m .yf9qa 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 Npda,jlcdd*x ro4ye0 vgj) x 324l7f(f along a rough surface. The cable attached to the log makes anp 3f2xarxd l4vf j)dje,g40 cl *(y7od 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 tilpvw ;pb q-/jsshc4).qted at an angle of vs pq- )cp4bsqhw.; /j$33.5^{\circ}$ 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 a5*sfpcttr ) :cn inclined plane. The angle of incline is gradually increased until the object begins to slide. The:5p)t*c rcsft angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?