Which of Newton's laws best explavtx;hg .zd+qp 9:i 4nnins why motorists should buckle-up?

  When you sit on a chair, the resultant force on you 2e5 lzbb .4ky3h wgur0is

  In the absence of an external f q0ofpv-ze o-i* 088zu,glx ocorce, a moving object will

  When the rocket engines on the starship NO-PAI we; zhx6auo3 *g8;ovnN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship willw8h3 ;* guo;neoz6axv

  A rocket moves through emptw1cdhc eg3s0yl 2y7 /wy 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 ap3/es72wccw yl1 hyg0d plied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall for ; rlarh9-gtt-ward. You can ir -a;trl9h t-gmply from this that the bus's

  You are standing in a moving bus, facing forward, and you5f.unz ek/ ufkg4 w2;z suddenly fall forward as the bus comes to an immediate sk/5 neuwzgu. f2zk 4;ftop. What force caused you to fall forward?

  A constant net force acts on an object. Describe th f0q1t nzc7yf6e motion of the object.

  The acceleration of an object is inverselnmcuzy 5jl8abxsv )13l(dr.) y proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net forcn1 vhfc/mj o-bt)p6l5 e is applied to m/ 6lm5fpvbh1n cjt) -oass 2m, then the acceleration will be

  A net force F acts onbf,5ejria b3i0b(kc,-m0 b m p a mass m and produces an acceleration a. What acceleration results if a net force 03i k er0amj 5-b,bfb,cib (mp2F acts on mass 4m?

  If you blow up a balloon, and then release it, wxy m o*0/y4wrjf/ul7the balloon will fly away. This is an illustrawxr/ /4 lwmuof* jyy70tion of

  Two cars collide head-on. At every moment during the collision, the magnitu 82/bqdhler9s1l0 uig 0st 8pide of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on thetdu/0l89 gsl08b1siq e2ri ph first. This is an example of

  If you exert a force F on an object, the force which the objectm8d0 k+cuhv0wv70rs8 1qsm b e exerts on you wilmdqu1rke+cvm 8 00 0 v78wbshsl

  Action-reaction forcesegga1 618)vq jtkj w*b.+tf:t1cp wg3soo) fw

  Action-reaction force)i)) l3wkjei bz; 4a,zq* u lrqy(0ujds are

  A 20-ton truck collides with a 1500-l+vz15rz bx1m0c nrw. eb car and causes a lot of damage to the car. Since a loc5r0ne1zvx wb mr 1+z.t of damage is done on the car

  An object of mass m sits on a fk;il 8 ,exbjd;lat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaxlk;ej8bi; d ,ction force?

  A child's toy is suspended from the ceiling by mey;fo b n+ uh)d93ywm-cans of a string. The Earth pulls downward on the toy with its weight force of bc+3mnhuf9o)dy ;y-w 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 forxdd ,nxw;y8l) ce. The ball hits the bat with an instantaneous for)y8x;x d dw,lnce, whose magnitude is

State Newton's three li7lceejp+i 2 1 8a8xmgaws.

  Mass and weight

  The acceleration due to gravity is loxb8pi+*8fd, tnx8jdmw: rqb 6wer on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's sur6pdtj 888mb ifxqw d,*n:+b rxface, compared to Earth?

  An example of a force which acts at ff/a4jw- 1xep a distance is

  Who has a greater weight to mass ratio, a person w )x vbcdbz:-)memd:5wm, 2rrd eighing 400 N or a person weighing mezd c)mrrmwbdx5: 2d-vb :) ,600 N?

  A stone is thrown straight up. At the top of its path, the netwqhwds 3w16 ,d 8do-trmavr)3 force acting on it 3drwhsm1 8 -wot 3vq,dd)r wa6is

  A 20-N weight and a 5.0-N weight are dropped simultaneously fjm3;m d c 8d3dp07y, 4quncbvnrom the same height. Ignorecm3n4p v7 ndm03c u;jbyd,q 8d air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective y(vqcp q f) pw,.m(:dwterminal velocities. Which object experiences the greater force of air frictio)f qd p(m (wv:.wqpyc,n?

  An object of mass m is hanginm,5ud7 oo(.vffpf nhzvrxi1d7;/ ow7 g by a string from the ceiling of an elevator. The elevator is moving up ah, .oo7fn5fuv ;7 df/ ozxm(vpdir 1w7t constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceili8ra*dc m -+tdeng of an elevator. The elevator is moving upward, but slowing down. What i cd8tar* -md+es the tension in the string?

  The force that keeps you from smrm njv20* 8xaf;8xuwliding on an icy sidewalk is

  It's more difficult t v4okx1d 3yf5oo start moving a heavy carton from rest than it is to keep pushing it with cons1 ofy5v4ko3d xtant velocity, because

  A horizontal force accelerates a box from rest across a horizontal sur54w+q4d; ( uls t5ek6 opldxcnface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the5x+6l(5q kdop4uc4sed t;nwl horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at hh ld2l.gc6 6hconstant velocity. Thus we can deduce thhd l626lgh. chat

  A block of mass M slides down a frictionless plane 6lz/qjpo: hw2 inclined at an angle q with the horizontal. The normal reaction force exerted by the p/2hj:wlzo6 pqlane on the block is

  A block of mass M slides down a frictionless plane inclined atx x k:b;ptq9u- an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directe:- tb 9ukq;xxpd

  A block of mass M slides down a frictionlessgz 8+h + vykn.la,0jm)walh(f plane inclined at an angle q with the horizontal. The gravitational force is directv+nfaka + z(hh80j lm wg),.lyed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclfq )s5pvn :t9 *hwcc-c6desi (ined plane that makes an anglewf*):d5ps tsqv96ich -(ce cn 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 appliei ; nze:y2dm-y6wuwtsw0- l 4qd to the object, and i2udwyyt-in- ws;ze 6:lmq0w4 t accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelo- xg)r7w a+ +lkvg.-h /ncgu;dfumn 6erate from rest to 27 m/s in 7.0 s. What is the average forward force on the n-gu+ ang7+rw;/mxvcg f. -hkdol6)u car?

  Starting from rest, a 4.0-kg b1ky +vz2jht5pufu;7qody reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting ouk; u5 pjtzhfvy712+qn the body?

  An antitank weapon fires a 3.00-kg rockek6ioe/q;o 6 y5m0 y2p 5bacawzt which acquires a speed of 50.0 m/s after travelin a6/5;pizo wb52kaecyy0 mo6qg
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 pu+gb,xeq9unqd:wh.3 ;uc c9h4w e ,dns sh a 10-kg mass from reqs h, 3c: ue;cb.dw94nghe9, xu+qndwst,

  What is the mass of a person who weigh qlvvxx7b;ntvf2;o i a +h9 8:bxhba94s 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Ef(7 r-0fuog;( mnmz gfarth where the acceleration due to gra0-fgguform (m7n; (fz vity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mas7yhml3 0n9zwh q* 9qi6grek -2kvg z7fs of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on tv 0nlw3- 9f*6kg7qz hg q79m2rzhkeiyhe Earth?

  Object A weighs 40 N on Earth, and objece, 1*m8 v:uy 6bx/uk:d xzamqut B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objects ,qemkmdy : 6x/1uuua: x8b*zv.

  Sue and Sean are having a tug-of-war by pulling on opposw / +5,8g kxfn( mw(pp5lhqbpjite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acc( 8 hfp5 kpq+x/wb lpgn,w5mj(elerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionle0:zg yvsd/zky/7at +yss surface. A force F acts on the stack, and it acceler 0y:/v zdk+ysz7agty/ates 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 elcs3 ixdf,jx d6g(7 m jw7r/jcf;9r 4zpevator. What will the scale be reading when the elevator is acceleratf;pzxj 7r(fgm9c csrw,j6 jd3x/4i7ding downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the persoa7b )e :tzu5t y(0tthwn is 60.0 kg ane hw7t)5 au0(tztt:b yd the 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 the mass of the person 1uswxh+na7qi e)r0g* is 60.0 kg and the elevator ac 1u7)e i+a0nhxwr*sqg celerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces actxbpy, :sg8 (xy on 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 is the acceleration of tpy:b 8yx,g s(xhe mass?

  An object of mass 6000 kg rests on the flatbed of a truck. I / x3n2e4h:v duan 9*xxzneal:t is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is travelia n 2 u:nvlx e/e3nxhzda*x:94ng 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 resebmx3a3x-or( ts on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck ia3b(3omre- x xs 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 = 0u pq:i 2.f j0l2qse4hyd6ydo4/b)q yf.60 kg and m = 0.40 kg, what isplieuy4d.y 6)dh2 ysfq /qq0bj2:f 4o the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine sho 2zsghbj, 1k*kwn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction*kkgh 1z b,2js and the mass of the pulley.)

  A student pulls a box of w ( tn-mgax *,q:s:jzkil0i(fbooks on a smooth horizontal floor with a force of 100 N in a directinkwq *0ja is ft:x,:((-lgmzion 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 fo24ybs7cn d7ft)crga 4rce of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kgrync s7g7a4 bt2c)4df , what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes a9+*u mpdz: lmts shown in Fig. 4-2. What are the t9 :p*umtdm+l zensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the t.p i3i.tw;wpc(vxq10v , canorafqi30. w.oa,p cp;(vctwn x1 ivfic light?

  Two boxes of masses m a3f5n5c(yckya nd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceler y35 cf(nck5yaation of the more massive box?

  Two boxes of masses m and 2m are in contact , t.mj pcd8m-a/3fp+kypgqp6* .v-q xutnbu; with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the --*8b tu6ptp /; nqukpx, mvc+pf.dqm y gja3.more massive box?

  Two boxes of masses m and 2m are connected by a rope. (S *mkdbrltle /:29ipg ,ee Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connect/: 2rmlp,bd9eg*t ilking rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.)(0 2zeryji kyce+d x)1 If the forward force on the more massive box is F, what is the acceleration of the leiz+y2y x0re)(jc 1 edkss massive box?

Two boxes are connected by a cord running over a 5 f-tkq+ zhh ahs)-h5wpulley as shown in Fig. 4-5. Box hw - hhz)+q -55shatkfI 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 static and kinetic frictions between a 3.0-kg box and a deskto+te) )mndd* are 0.40 and 0.30, respectively. eddm*+n ))ottWhat is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static an;g7jcm- 8gmznj yb1eyqy8x- j8- oq q0d kinetic frictions for plastic on wood are 0.50 and 0.40, 1jm88qy8o-jz;bgn-g qmjyyc7 ex 0- q
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 comes to yc 2/stbrn3s-e3 id/s a stop with a constant abye3n32rsdt/c is- s/cceleration 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 pullg dihj89 m*:gfed by a 5.0-N force. A 3.0-N friction force retardsjf:gd9gm 8*hi the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mas;jk szr 7;k*prs, 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 initial speed of,fgx*d ;y.2b7yq-b xtw t 4wpdiedp/ 3 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friptyi*gytx;/pq x w-,7wdbd f. 4b 23edction between the puck and the ice?

  During the investigation of a traffic accident, police fin0 pdkti0r, t/qd 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 tkdq, p/00rti 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.)qco39x ap)x z6 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 is the static ao x9p3zcxq6) friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) hd8tou3. i- jd/pzv 9-vn,kbx 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 v.dh k 8d9- , znojx-/puibtv3box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is. toky,3ol5hcexl+ wkk j-i; ; inclined at an angle okj;l- ;.ew y+tockol3x5 k,ihf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill 55(j jl wcw +bl6kbd*hthat 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 wi;jh;kz)xs w -t44 oobbth 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 inclid hyu+k/:zn3((ec8 7obua m bhned 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 direc50d-efsp rb s,8 aoqa9g;dy n4tly down an inclined plane, at a constant velocity of 6.0 ma spnf,eqd ob 459gr8a;s0d -y/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 teu;h 76b/ k/nlvhm4ha 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 r4y2+q sr lx+vsgra c)/ough $37^{\circ}$ 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 s-f5t tsbwv.x 9qt80salong a rough surface. The cable attached to the log makes an05-8txwqt vs9.sfb st 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 puf3u 72-isv gu22ehtmlane tilted at an angle oi2ut2fm 7 vuhge-3u2s 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 gradually-i00iy s6wf du increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static frictiod0yi60si- wufn between the object and the plane?