Which of Newton's laws best explains why motorists shou4- ap5y/ mioz463cx/zpp*kcjb/gbh t ld buckle-up?

  When you sit on a chair, the resultant force on r.cgl9 k kk rsq/2av91you is

  In the absence of an external force, a moving84gmqi+8)wcb 0w ixnd object will

  When the rocket engines on the starship NO-PAIN0 m/k9dzvcmjw1gxeyk;2( m 3p -NO-GAIN are suddenly turned off, while traveling in empt 9cv;m3jw1/kmzg d 0x2kmp(eyy space, the starship will

  A rocket moves through ei vflaqv 4xmj1qg i :e4f.;-k)mpty space in a straight line with constant speed. It is far from the gravita vg j;4-il.1m xqqafe :kfi4v)tional 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, facing forp7xk68z.9;hdhe y6qibeqrs 0ward, and you suddenly fall forward. You can imply q6 0.ix6y pes h9;ehrzk 8d7bqfrom this that the bus's

  You are standing in a moving bus, facing forward, and you suddme*1p :*/w2hszlfjt) 7 vmwa venly fall forward m* m psef/ztvj l7ah2*w: vw1)as the bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an4enp8azdxte2 9n6g,m object. Describe the motion of the object.

  The acceleration of an object1ki,i nqh tn86 is inversely proportional to

  A net force F accelerates a mass m with an acc;x;1h sp p kvkmgx*j3bj/f9+feleration a. If the same net force is applied to mass 2m, the xf 3h;jp/m +pxkvf jb;1sg*9kn the acceleration will be

  A net force F acts on a io xn2 q6vfk3(mass m and produces an acceleration a. What acceleration results if a net fonfi3ov2 k(x6 qrce 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly o 1iwwg,/sw:o6v22krdjjic v:e/*u eaway. This io/ /egicved:2 ,s2iwjjkrw1wvu :*6 os an illustration of

  Two cars collide head-3+nx 8n pkertk2 ;wvx*on. 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 second car exerts on the first. This is ve*;kknt xrn8w23+ px an example of

  If you exert a force F on an object, the df0qnu(bb0xkns)j n,(hi p9 5force which the object exerts on you willip nnu) xb50b09((ksjnhq, fd

  Action-reaction forces 9 .*(k+q5b r0pg;ood przipkm

  Action-reaction forces are-ryybqp* x4 fy(m +2ea

  A 20-ton truck collides wit mup n5sdt1t2uf0g8bt c71b3rh a 1500-lb car and causes a lot of damage to the car. Since a7u tmfd20rtp cu5 bt113ng8sb lot of damage is done on the car

  An object of mass m sits on a flat table. The Ear0 w 1ij:fpob*qth pulls on this object with force mg, which we will call the action force. What i 0o:*b1wqf jpis the reaction force?

  A child's toy is suspended from t:,js;gz8xy*4x ahfod:yv y 7ihe ceiling by means of a string. The Earth pulls downward iy zg: yx4vx s8h:f,7d;oayj*on the toy with its weight force 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 instantaneous forceuvoj2h a 09cc( ir9sw7. The ball hits the bat with an instantaneousr7ic9acso 2 u w90hj(v force, whose magnitude is

State Newton's three lyknw (4(dno- aaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon ts(p.;amonz q tem503mhan on Earth. Which of the following is true ab5tm. s mn3a(pm0z;eoqout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force b.j n/bo,nsxz 16cbi8 which acts at a distance is

  Who has a greater weight to mass ratio,:2bb-nxeii wer :rj 4(yigs 0*z/e c5qb5 *pjd a person weighing 400 N or a person weighing 600 Nrib/ q r:npydei2xc-*0*eg5z b 5:(s bj4eiwj?

  A stone is thrown straight up. At the topl d *l341- wtu6us so j0aek,uzfud8+p of its path, the net force acting on asl s+4u1opzf 6*,3 k8du-0utjewdu l it is

  A 20-N weight and a 5.0-N weight i3jb85k 6kb,e6 ulfa hare dropped simultaneously from the same height. Ignore air resistance. Compare their acce kifeb 68b alukj6,35hlerations.

  A brick and a feather fall to the eargf o/;*z84g debq 3ldp4l*hwrth at their respective terminal velocities. Wh3g*b/ or8h;ldwq4zdgep* l 4fich object experiences the greater force of air friction?

  An object of mass m is hasujzt .; 7g/kznging by a string from the ceiling of an elevator. The elevator is moving up at s.g;tk z/u7jz constant speed. What is the tension in the string?

  An object of mass m is hanz j bqeqa143j1* axhc40m o ;dj5g7bpuging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing d *0a7 x j;z5 jebbqco4du1pm3j 1hqa4gown. What is the tension in the string?

  The force that keepsyd .z/jn89t ydyb,g i; 3nau3c you from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep wvrz9pz:3.jrco4hmpi 4 j*j-g0,hw k pushing it with constant velocity, bec-ppo :zz 3h9wv.righ0kmjcwj4r*,j 4ause

  A horizontal force accel xsuyu fb ()b5+ydd-m:erates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated)+u(s:mdxy bu -dbf y5, 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 ram8ea:jsye ,zq3we 1(d 1rl+ jjmp at constant velocity. Thus we can dedu1a s3eeqmw+ zjeyj:ld8 j, 1r(ce that

  A block of mass M slie d02aa8v injgv3a)+h 2u(pdm des down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted8n2 g 0muea+3aad h)2vijd(vp by the plane on the block is

  A block of mass M slidrnt2(1nqnacp vv 7hf8u3b 7b a6q8b/kes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is dire738 vqt1bckna(h p2 6nvb8u b7rn af/qcted

  A block of mass M slides down a frictionl6qcwmrk; g4s4u 6bohn)+:od eess plane inclined at an angle q with the horizontal. The gravitational force ko6e4 wc hq 4g)s:m6nub;o rd+is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on anl:bm5 qv9qg9v5le gw5 inclined plane that makes an angle of 30e with the horizontal. Make a statement which best dew5:5qbl9v9ml ge5 qgvscribes their acceleration after being released.

  An object sits on a friu lk3; czz )blroeno7 ixd1o2w;01 a-actionless surface. A 16-N force is applied to the object, and it accelerates at 2-o 31lbw7nroozi ;cdl) eu;zak1xa0$2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can laqf*m b9g7- ytv:gx7 accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on taxg7*7- vt myq gb9:lfhe car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whaoww 0robfg5t3g 30q 4it is the net force acting on the boo0wbtfg 0o5g w 3q4i3rdy?

  An antitank weapon fires a 3.00-kg rocken s9 q*3lyxl(97 arzzht which acquires a speed of 50.0 m/s after travsra3x7z*q 99znyh ll( eling
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 push0y l(nft)p fgu4ci ,e* a 10-kg mass from res0n clf*te f,( 4pguy)it,

  What is the mass of a person who weighs 110u4:o7m 4s)b idqr9 d8gbzoy4mld 8b-n lb?

  What is the mass of an object that weighs 250 Nq o.c)+my6w aooz,8lq on the surface of the Earth where the acceleration due to gravi.cwo+oao8y ),qm6zl qty is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the qn5ij*3 otz 0jmass of the object on the surface of the Moon where*zt n03j 5oijq the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object-n/ntkh*dr wdq hgy5 p *o 6e.+qpwi88 B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the obje* tr6/ 8e nog+pdhin. dk-wwp8qy5 *hqcts.

  Sue and Sean are having 6mybwm oy.0ra(a.f: .)*uvi g0p jkdma 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 if the rope accelerates 0(gi :. o mam. wk).60mfpy*dajvryubtoward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. r,eq o+ssm+-xxii*(oy wg)7p A force F acts on the stack, and it acceleratei+go xisewo, yp )x r-ms+(*q7s 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 inn 3-zg j.jb3s8.ybxv g an elevator. What will the scale be reading when the elevator is acceleratij8 xgn 3by b.gvj.z-s3ng downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevazk a9a /xg+iqj u *y;gi41 b2c/nwj;vxtor. If the mass of the person is 60.0 kg and the elevator accelerates downwardz;vag4cx+ /j2ig ;u1y*nbjw /ikqxa9 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 i15v/ qz75raxzwl p :q77itmgdcx6 4 /. csjexperson is 60.0 kg and the elevator accelerates upward with an acci 6q5edzxx7parsz41:7x.cc7 /vl/5 wg mjitqeleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. Ong dh1y7 ga9 z*nl81ist8kd /kze force has a magnitude of 8.0 N and k8/a18tzgk gysl*1d d h7n9zi is directed 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 kg rests on the flatz/x8y2 lm :y sz(roxn6bed of a truck. It is held in place by metal brackets that can exert a maximumx8l6xyz:2sz myno/r ( 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 heljj9lk )g)0-g ndzzc345 l9eykgvi (pmd in place by metal brackets that can exert a maximumdvgg3elz(4kj9y p) n-i9k l0)mgczj5 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 m3)x u kydzih*kfn lt9+dd),f9 = 0.40 kg, what is the magnitude of the accelerythk3)*d)u9fi n+k,dx9 f d zlation 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 and m = 0.40 k fj 8j0h6cqdh:,4ypob2lcmu) g, what is the tension in the strijluqjo hm6 8:df2hcy)4b0 , pcng? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books) i ihh5gfs24l on a smooth horizontal floor with a force of 100 N in a directio)h52sgfi4 ihl n 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)nrbtju8r (r7. xb qn,ith 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, what is the normal force qtu.b8x(r 7 rn )jb,nron the box?

  A traffic light of weight 100 N is suppo *xh; v7+hbm1szu 6:(/ery izikgppg2rted by two ropes as shown in Fig. 4-2. What are the tensions in the ropz2y sgpx:( r1u e +bgii*;6h/kzh7mvpes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, wh 8sxax+xpov36ou q/s0at is the mass of the traffv3 sxxu6o/pa8sox 0 q+ic light?

  Two boxes of masses m and 2m are in contact with each othe6 po wbq2c*vv*r on a frictionless surface. (See Fig. 4-3.) What is the acce2wo6q* pv* vcbleration of the more massive box?

  Two boxes of masses m and 2m are in contact with e(m lv rclzdax(accv ,-6i5-i3 ach other on a frictionless surface. (See Fig. 4-3.) What is the net ford5,cm v ciaxial--( (c3vz6lrce on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4yl+ej8/ ocz i3.) If the forward force on the more massive box is F, what is the tension in the connecting rope/8 jic3o e+zly?

  Two boxes of masses m ai3 83auj5ldwm; qe62)sxkfjcnd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on32 kjjidxac;)s5wqmfl386e u 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 pulley as shown in Fig. d(wy,s(pgf g /4-5. Box I sw((g/dg yfp,of 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 st.mf qhkhe/tspr 3.ssh ii(9.0atic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.( i0hm. 9./t3pfs.hqeshrski30, respectively. 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 frictions for g,xdpde8 d8 9t0e9s 4g8b ibjiplastic on wood are 0.50 andb 8jds 8,8ei0g49d ebtdgxip9 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 surface in the +x direction. It slows and cl;qx k0 th0,pqomes to a stop with a constant acceleratq;0lktq, hx 0pion 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 horizontx.(cwphy1 ;o bal surface is pulled by a 5.0-N force. A 3.0-N f;.w (1cphxy obriction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate of zy:y vm9f:ika)hve 1) $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initia p-1pqvnxgat n,x9a0iuc*2t1l speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction ganxt va9,tn1up12-* c0pixq between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m.bcmm. jkaltlh c7( 0/ long. They determine..0hlm kc amc7jb/l(t 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 applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfachadgg t6t r-3sg:3ho,e between the more massive g-s,d r :to3atghgh63box 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 is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked.t d (8zlr/qzs+ (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, w+(l/qztdr8 z shat is the coefficient of static friction between the boxes?

  An object is on a frictionlese8h jdp(ar/xa 0o- ov/s inclined plane. The plane is inclined at an angle of a/ x r/p-ev(o aodh08j$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hil i0-: nvmzo)g k,lx91rnhej) zl 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 an6s5qi1px/20 ji18x/cxs klh rza vey4 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 tiuv pay1n awqv *l80*;uq.kvt6lted 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 inclinel ntt0fiv q5/6rn bny-. 71nuud plane, at a constant velocity of 6u uq nfintb/y70r nvnt6. 1l5-.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 dow1geaii+ e i1- 2h*n4qh 4ln,zed3yjyen 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 azxiv)9atb vetp n:*06 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 weighraek4t6mofp0+ p) ( r(nwuou (ing 500 N along a rough surface. The cable attached t()4 f upr p0(+ (trowameu6nkoo 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 inclinedo-lq mn9 xyibe- i8u8vu593l m plane tilted at an angle o3q n8i emu- lib-l9 8v5um9xyof $33.5^{\circ}$ 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 angl yn (uo17te 0yyr9h/bmr5c0uae 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 friction between ttrnem c( ybr9705yu uo0/yh 1ahe object and the plane?