Which of Newton's laws best explaita nn2mv7d/aa+3g 2ytns why motorists should buckle-up?

  When you sit on a chair, the resultant( t-l)y.glwrd force on you is

  In the absence of an ext.k9(6zsr.yr lq pb4r lernal force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned 1mt 5 fgmq9 6m+tkgo /bdkw/l)off, while traveling in empty space,/ogkmm 9g65q1/) + kfttdmbw l the starship will

  A rocket moves through empty 7zxmsn9,a)h c 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 be appliednc9sh m7a) x,z to the rocket in order to sustain its motion is

  You are standing in a moving bus, facinga)d3e2fmu5n 9 7ujtdd forward, and you suddenly fall forward. You can impl5m39ddd7unatfj u e2) y from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall fojfqqo*bh c-2i la,t-5 rward as the butb,j - ocflaqh-5iq 2*s comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on ankzrc;(v7 j rqb+j xun,;b qb:3 object. Describe the motion of the object.

  The acceleration of an object is inversely proportioat6 a/k ;e*b as72ffcpnal to

  A net force F accelerates a mass m with an acc 9vdt b,c9,ljos:z0ns p 0ljl3eleration a. If the same net force is apj0 ljlslc9vt s:03pbo,,9dnzplied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an accd 0z67f8oai- wthl7fdwey /6qeleration a. What acceleration results if a net forct7q8 i66d /fo0 -wydealh 7fwze 2F acts on mass 4m?

  If you blow up a balloon, and then release u2eof tk (fvvp b 56+ropa)0a583jtqxt+w 2xpit, the balloon will fly away. This is an illf2ptx tj) 0 a2b q3oux5f+rpwv6ve5 p+ akto(8ustration of

  Two cars collide head-on. At every moment du20: jls;wc4a7mz l5il;vvymgc2f 0ay ring the collision, the magnitude of the force the first car exerts on yvaf0a;v0: c;mc5 gs47 llijl 2my z2wthe 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 fr4slv5;0te p0gbyqe 3orce which the object exerts on you wil3pey lg4btv0 q;0s er5l

  Action-reaction forcekrun lywq8d j2-ay(yyp79 f6, s

  Action-reaction forc*pb oy. (lvty+y l/2yles are

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage z3e65u q0nqt.lier +3npljxn)b8 ) wfto the car. Since a lot ofbl5rjq+ )q 3 n0wutip3xelef.nn z )86 damage is done on the car

  An object of mass m sits on a flat table. 6a,xll+52- )f hf k*gnetgif b The Earth pulls on this object with for+hg l5af *klxite)b f,gf2- 6nce mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. tb2n4rq /tlxxclqy1/a-p* e. The Earth pulls downward on the toy with its weight forcen.e4q ttb*//x ray p12q xcll- of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N insxuc**wek. 76 f.tcphx tantaneous force. The ball hits the bat with an inswuk.*xcf htc.e x p6*7tantaneous force, whose magnitude is

State Newton's three laws2 0qan0n wude4k, 7pmb.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than h) l4e wnv:06+x39u pnnc oftcon Earth. Which of the fo hcvt4 cpne)wln06nf:u93ox+llowing 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 dista4ugo1isj jp27 nce is

  Who has a greater weight to mass o -.uvn;xpj 9d3.g swgg0 xjpd,f)hr6ratio, a person weighing 400 N or a person weighinggv3r jxdo. .jf;pn9xp0 )suw, g d6-hg 600 N?

  A stone is thrown straight up. At the top of its path, the net force acting oe+t tdwe9lje :ul)q*,n it is9 wejl)tu*lqd:te e ,+

  A 20-N weight and a 5.0-N weight an;9 jxu.*lkk 15w+ryome-f isre dropped simultaneously from the same height. Ignorr*5y;ox-e1 jnus w k.m+if 9lke air resistance. Compare their accelerations.

  A brick and a feather fall tu9zb gr/27 g )xajpmmvr;.y/ro the earth at their respective terminal velocities. Which object experiences the gre.p;2)m /uzajrg yxrvb7r9 /m gater force of air friction?

  An object of mass m is hangi gz9u: 2shlw6ba15blkng by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the sl91 w2akblh5zb:6sg utring?

  An object of mass m in4cgvg) /o* nls hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the st/*l)4go cgn vnring?

  The force that keeps you from sliding on ag bf8uk7z6ht e8ffk,5hbvk05 n icy sidewalk is

  It's more difficult to star0t, c3w ;;+qcf8zz4 +kkr fmxoxaipf;t moving a heavy carton from rest than it is to keep pushing it w8+t;, ;3zq04+;cri cxak k fmz ofwpfxith constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surface (fri(f4w kx jk2v/pr.:a vai 2 xvo8xrmd34ction is presentd k4f2var r8jm xo 4v ka2w:/(v.pxx3i) at a constant rate. The experiment is repeated, and all 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:yg6 e7wogv+y at constant velocity. Thus we can d wegy+ov6y:g 7educe that

  A block of mass M slides dow5egk)ir(zi 7 ke /h(p2/ skz*sg1 ztmfn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plani ek(7s1t2*m/ iegg fz/(zks) rph5zke on the block is

  A block of mass M slides down a frictionles b3qgj:r9 et9cli h-s25t8wns0yn b,mhu,c7 zs plane inclined at an angle q with the horizontal. The normal reaction force exerceb3mb- ,utn75clz9:,h0r 2jg8wtsy nhs9iqted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclit ie*8wvuiyo)u af362m0 imj3ned at an angle q with the horizonta my*vmiui 386)uea j0 t3iwfo2l. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simuc r: 6yuue1/cqltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after bein uur1e:y/6qccg released.

  An object sits on a frictionless surcanafe3n; 2m 4face. A 16-N force is applied to the object, an;m4enfan3a c2 d it 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 in 7.0 s. Whavrqma82f 7;gmt is the average forward f8mq7amv2 ;grforce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.t m/gyl,e:8coyb7 xi/0 m/s in 2.0 s. What is the net force acting on the b8ylit b,cxyog//:em7ody?

  An antitank weapon fires a 3.00-kg rocket which;nr96qas 6veq acquires a speed of 50.0 m/s after travelinge;6r69aqsqv n
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 withw ag+- j,sz4aa the same force that you push a 10-kg mass from rest,wga4za+s a, j-

  What is the mass of a person who weighs 110 lb?hg9ux:2k i/mt53+ ty zpyfu- b

  What is the mass of an object that weighs 250 N on the surfacqnl*wny)0 h x 2olj7iu0* x,gse of the Earth where the acceleration due to gn**xuogw)q i0x70snj 2,y h llravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the mv.h 3* kh:fwiEarth. What is the mass of the object on the surface of the Moon where the accevhw* k:fhm.3ileration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and o/9dt7ue c7wb jbject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objec7cd9 uewbj/ t7ts.

  Sue and Sean are having a tug-of-war by pullfedz8*tf y 0q)2p/t7 bvks9gming on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Suekq sfeyv*79mft d )/8g2p z0bt at $2.0 \; m/s^2$?

  A stack of books rests onuur ptu -b*gn9 b3mu c8vd0q-+ a level frictionless surface. A force F acts on the stack, and it accelerates m3nb0-cu9bv+-q g*ut8 pr duuat $3.0 \; m/s^2$. 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 Ne ah8jn+ju/ a/dhb4d 1rqu-0f e +zmv/ stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating dow jafnu+r+euddhvj1z -m 40ha/e//8bq nward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. x)saip(/czh0zpk r,ht 61-nkIf the mass of the person is 60.0 kg and th1 azs(r z/-p0n xhpt6k k)ic,he 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 n1t+1.ptuql5h,fi k rin an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration ofqp5u 1nl+htt 1fk.,ir $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a maghec7)ri 3mnw a:amgr ; g1xzx2j ln5/.nitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is thex:/ w)ljh7 m3ac2ezgag1x nr5i.m; nr acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held5w85x (mgo+apq ckw 7 qz:p/fe in place by meta+empqo/7czqw(gpx kw :af55 8l 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 rests on the flatbed of a truck. It is held in8n)pyqy+-s rwjty 3fux, z9x 3 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 time if the load is not to slide fo n3 9,fyqzs+ r8tuwx-yxp)3jyrward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg .ur m na+m:rgptzep;ol3n. 0*vu6dq 8and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.pde n.+t r vlpa;qu 63ugmmo:8n.*z0r)

  In the Atwood machine shown in Fig. 4-1, if M = :377udcexxck 8n+q 9wye 2odyj. th*k 0.60 kg and m = 0.40 kg, what is the tension in72c tyukwxkhe ce7xnjd8:93+*o .qd y the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force o) tpts: hna(8zf 100 Np)z t(8 n:asht 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 flcq+7rcvu( b9 g o:uow8oor with a force of 100 N in a direction of w8gb7u(:ov o r+c9q uc37.0e 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 weight 100 N is supported by two ropes as shown in Fig. 4-2. at2;i7ub2cw3 *+ztmemx f0un What arfmmbca;23 wxe0u27+ z tnu i*te the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes ar gyah;u+;;rx55*h to yvc5ttye 50 N, what is the mass of the traffic l5 ox+ 5yhvuyhc; rg5tt*ta ;;yight?

  Two boxes of masses m and 2m are in contact with each - v8r0jeue 7vxa-naf+other on a frictionless surface. (See Fi -e vva7r+0e-juxf8nag. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with e8ymh h5 ,:ag;ss kye7each other on a frictionless surface. (Sehm87k:ss h, ;a5yeg eye Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are conne se /uf6;qv.lpza:gukj/p7+n cted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in ej7n/ :s q.6 pl+fpugvkz/a; uthe connecting rope?

  Two boxes of masses m and 2m are connected by 65 )yc1dsla:ge5kqu e a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less mas d: g65aqsey51ck u)lesive box?

Two boxes are connected by a cord running over a pulley582 ku svgpo9w as shown in Fig. 4-5. Box I opsu 2kg5w8v9of 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 fric/6rzu+ qdxbj 9tions between a 3.0-kg box and a desk are 0.40 and 0.30, rrjzxb+/qd 9u6 espectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and ttsg/ c grm/ 4-p2a e0mihp05rkinetic frictions for plastic on wood are 0.50 and 0.4005/0gg4sh/tmrei pma2c t p-r,
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 sy (3+:b7pdzk4oepld ofef+s- lows and comes to a stozks(o ld47ef3 :oyp -p+dfbe+ p 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 3ede3f18ej56l tj ; y1pd hhg(3*aobfz.0-N friction force retards the motion. What is the acceleratioadhjf58(31 ;pt1h * 3y6g eefld zbeojn of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a ra5u,) f tn v-zj;p2nv2i mgmrz)te 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 angth0hehq*ja2 mk--ty 7. f3v d initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction bet.7m t g*3h0tfj-k2qae-hhdvyween the puck and the ice?

  During the investigation of a traffic accident, police find skid markk 7:-kcxmlm+ss 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for t+: l mc-kxk7mshe 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.) l.n oq54m 8zllw,xr9 1yq/gkk The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If th 1qkyoxwz./rl q84nl,l9gkm5e 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 Fig. 4)(shmxnjtvn5/qpt22 5vm /ly k-u)al-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 n-2 mxlnn2v/ /auvl)ytqh p(km 5sj5t)ot 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 inclin zk4t.x fc8 ic*,fb..vvuzic,o +c4aymep i2,ed at an angle ozv24c k,eavpz. *m.,ou fctccxb .fi4ii8y+, f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides downx)pe pv.h3 l82v*:sxkh g iaa; ws7qrsix42*t 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 smmjxy s1.r8xa(mf7 7gi ooth 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 inclined plane tilted at .zrqfr)h 77n9z : bqvtan 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 veloq:0c 3tay1sli n wj.x, fadn4:city of 6.0 m01ny :a,x.fjw clt3d n4s ia:q/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 myt.yxx)k8-l d 3f 4mp*w8lehzdeyq) ibg8 +(u 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 a4u- xf7z/vmsx 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 surfac 7s/e/ bn)uiyce. The cable attached ti/yce/ b)nu7so 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 rou*h2m e cmmekj16,s-lhgh inclined plane tilted at an angle osm ml6 2 1je,ech*hkm-f $33.5^{\circ}$ 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 plane. The angle of incline is gn:9y-yaa y vi(radually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of vayy a iy9:n-(static friction between the object and the plane?