Which of Newton's laws best ex*6jswic62 r kpplains why motorists should buckle-up?

  When you sit on a chair, the resultant force on you t ixby7 d-mo 9wuzl:0;is

  In the absence of an external force, a movl(cu qntnz) ;1ing object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudo/fv+9h.c mvsdenly turned off, while travelin of .vsc+vh9/mg in empty space, the starship will

  A rocket moves through empty space in a straight line with cowri k (rb9c58vrpr)2 9 3rzneunstant speed. It is far from the gravitational effect of any star or plar8r3z krib9) 2rew5vu 9r (cnpnet. 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 feb 9--ssx t6goorward, and you suddenly fall forward. You can imply s69etx -o-gsbfrom this that the bus's

  You are standing in a moving bus, facing+;a, f xx+6twjuu g/mw forward, and you suddenly fall forward as the bus comes to an immediate sut /++6wjxfwx gam,u; top. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objectyn2tec lvp:(*aaddys 2q28;4sf1rekt p/bl( .

  The acceleration of an object is inversely 0 lbfv(kabr kz16q0(u1 qfw f1proportional to

  A net force F accelerates a mass m withh,8*l uf84 oug wexxl, an acceleration a. If the same net force is applied to mass ,gl ,*8e4ox ux8uhwl f2m, then the acceleration will be

  A net force F acts on a mass m and producet*wo8qnueicqq*d3 lw*) c lhd;w 197 hs an acceleration a. What acceleration results if a net force 2F act9n3uqw;**e) h*q8c wdo7tqc 1hwdi ll s on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away y8zbkow;cls1;t:/5m3gkgf d . This is an illustratiolgbo; :mt5 1k8y;gfs c 3zk/dwn of

  Two cars collide head-on. At every moment dr 2s1e h2gmb v(fpsr/9uring the collision, the magnitude of the force the first gfs m92/e2pbv (s hrr1car 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 for1nzwwrv+j l, */gp:fnce which the object exerts on you wiz*j +w1: rpnvw fgnl/,ll

  Action-reaction forctfklzfy u* 5to/v38rmm2ed0 ( es

  Action-reaction forces arenzm:e r+sr q2jfocb -3a vp 2x*s/6.so

  A 20-ton truck collides69 ol+8f2kc*dw lchaw with a 1500-lb car and causes a lot of damage to the car. Since w9c2c w8ol+ 6fkh*dla a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this ob )ocvsjf 8lg- o0o34gfject with force mg, which we will call the a8fjc30-s)oovlo fgg4ction force. What is the reaction force?

  A child's toy is suspended from the ceiling bn;ed hscp z8b) hq, .:kcm3+vay 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 "reach+:e a k;v dzqbc) .spn8h3,mction force"?

  Your bat hits the ball:ub +8yp u)v/ in-ckwu pitched to you with a 1500-N instantaneous force. The balp:uuu+) 8yki wcvnb/-l hits the bat with an instantaneous force, whose magnitude is

State Newton's three laehdyix 8n 4h j(3iq);bws.

  Mass and weight

  The acceleration due to gravity is lower on the fqj;:1jtrya 9lza j*x2s;, n 2d +arqqMoon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon'syafqz1q; j nj+ ara9, rxdjql ts;2:*2 surface, compared to Earth?

  An example of a force which acts at a dist-l+d y.d0koil tk1ab6ance is

  Who has a greater weigwitkma e z+ .:4by63sfvq hbgw65-;wvht to mass ratio, a person weighing 400 N or a person weighing 600 Nftsv ba.qww4:5 miy;k6weh+ v3b6 -gz ?

  A stone is thrown straight up. At the top of its path, the ne*ay 9c 3gquet*t force acting on i*qug c3ate *y9t is

  A 20-N weight and a 5.0-N wei yes1j8v8g7my uuiy62ght are dropped simultaneously from the same height. Ignore air resistance. Ce6g8us i2v y7uy81y jmompare their accelerations.

  A brick and a feather1spd t*d j3w9m fall to the earth at their respective terminal velocities. Which object experiences9p tsdmd *w31j the greater force of air friction?

  An object of mass m is han4liyh m2f7/ vnging by a string from the ceiling of an elevator. The elevator iv4hi27 yfl/nm s moving up at constant speed. What is the tension in the string?

  An object of mass m is hangin6 ;s hscz.vln6vr6kg0 g by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensio6z0h6c; vrsns l.g kv6n in the string?

  The force that keeps you from sliding on an icy sidewalk ism8tq5h6yi;li3zyr u, h y(bk7

  It's more difficult to start moving a heavy ca glb(4*l// f i6uh7vli ujq/hmrton from rest than it is to keep pushing 7/4hli*/(v glh/ iufj bmulq6 it with constant velocity, because

  A horizontal force acceleratebd/ ixa(l*d r;s a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain rb i*/lxa(dd; 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 atzr93 1d-c3x8:c x beq4pnbcle constant velocity. Thus we can 31r8zepc-xec:d9lq4 c3n x bbdeduce that

  A block of mass M slides down a frictionless plane inclined at an angle d( f)q,b2smtae;sad a yk2c5(/x:ts jq with the horizos d(sfs;,d(jt eaa y):mbt k5xc22q/ antal. The normal reaction force exerted by the plane on the block is

  A block of mass M slgmsu:4 7w4hnh(k.cflwuhdiq(v z145 ides down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is diziuhw (( h7.mc4q15swg4vuhl4nfk d :rected

  A block of mass M slides down a frictionless plane inclined at an angle q wit 65q6s jaxj; :d)ubeyi4ig1mnh the horizontal. The ge6jg bn4m:;udy 5i 6q ajisx)1ravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released c/ 8cqjva ua:1 9pdwj:simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes t:cu9c8 :1 avdawjjq/p heir acceleration after being released.

  An object sits on a frictionless surface. A 16-N force isjp 4ybl()22a4yy x:p bmw4u fu/x nzi0 applied to the objectnp /4i yy4ux0 4yjw: f2xpubmzl 2a)(b, and 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. What /t*1gqk d i5 s1,sd+/g*gnf 2ipjegjdis the/*1p*ggtsj2+/dgfig kqn i jd 15 eds, average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wha2w)jfic*okmf /m) u( 14inkuwt is the net mfk2uimwuoc fk(1)nwj/)i* 4force acting on the body?

  An antitank weapon fires a 3.00-kg rh +jbe t;z0. )pnqe5 ek)ab+yrocket which acquires a speed of 50.0 m/s aftbabqnpey5h +e)+e0z k;tj.r)er traveling
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 mass frbg4,ldr:q wvjm. e4)v /mqn*zom re, .d /zwrevgmjbqq)*4: m 4lvnst,

  What is the mass of a person wv xhr,/l,)l ws,g6gscho weighs 110 lb?

  What is the mass of an c6 4e cx6gne v0)baj-pobject that weighs 250 N on the surface of the Earth where the acceleration due to gravity ex6bpve0 cag)j 6 4-ncis $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the massj 3 -db;iikk03dd9o vd of the object on the surface of the Moon where the accelddb0k9ik-d; 3dijvo3eration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 pu1i (9knx ti(sg:f4z N on the Moon. The Moon's kz4up91sfi ti( (: ngxgravity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite 2ef:.mw:n k g;o/kozpj kg 5r(ends of a 5.0-kg rope. Sue pul nm:p gegw;f /krkk o.j(z5o:2ls with a 15-N force. What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force Fdtj : o8l5 /dkc:rq452 yhgsdi acts on the stack, and it accelerateds/ jg5dlti2yk: 5 c8h:r4qd os 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 c ,h .lj-e evwf9;fl,aon a scale in an elevator. What will the scale be reading when the elevator is accelerating eh flw;lc-evf 9.aj,,downward at $4.00 \; m/s^2$?

  A person on a scale rides iqj5zpqqd io11/ 8s.a:*p kwzzn an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an akzwq:ziqz dp/ 8a 5opqj11*.scceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in a10z d7xc pio ,27snftvn elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with az t 2,div0xspcf7 n71on 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 foz6yn ,3kj.ddf5p -bhrrce 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 t-f5hkb,znpd 6r d j3.yhe mass?

  An object of mass 6000 kg rests on the flatbed n*d/ k9cx3dwdof a truck. It is held in place by metal brackets that can exert a maximum horizonta k*dcdw3d /xn9l 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 helpg/k: hsat) b +gsgf;+d in place by m ;g b +sgfgt)ak+phs:/etal 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 forward into the cab?

  In the Atwood machinsu q hr3 wpaff8qw.58*e shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pull w8f3hq fqr.ws u8pa5*ey.)

  In the Atwood machine shown in Fig. 4-1, if M = 3i6tx(2mun53j rn zba0.60 kg and m = 0.40 kg, what is the tension in the string?r6n2txj5b3n(zm au3i (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal0 d0dw . ,b+jfywzmoe* floor with a force of 100 N in w* w e.zdfbyjm+0 ,od0a 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 bookst5i+t szc-b,i 9* yq; xfq8doe 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, what is the normal forsizbqt d it,x o fq5+y9-;e*c8ce on the box?

  A traffic light of weight 100 N is suppqur pkw-s6)9lo*u zx +orted by two ropes as shown in Fig. 4-2. Whalxk+q6*suprwu- )o z9t are the tensions in the ropes?

  In Fig. 4-2, if the tenm,k kz58ewr. bw8ks+2 9dm-vkmt s8ai sions in the ropes are 50 N, what is the mass of the traffic light?iwmkrms., d9w8m v8b8kk k-t5 s e+az2

  Two boxes of masses m and 2m are in contact with each other on a frictionles cdm -vce8cn0)41bztws surface. (See Fig. 4-3.) What is the acceleration of the mo0dc 4z-nw c)8t mbe1cvre massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictpr/m8f7 am.poionless surface. mpm f8a./ por7(See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) Ifqe61309umbnf tcic 0 q,bq ui- the forward force on the more massive box is F, what is the tension in th6tq i quu- fcbn1 cib09m0e,q3e connecting rope?

  Two boxes of masses m yo,f2 wq9.lm gand 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more mw9q2 flgmy .o,assive 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. 4hcmf3ls/nqz/ oz: 1)kgr0z h17 iji:j-5. Box jz /7h1isocg izl/kz1mfrj)0n 3q ::hI 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 3.0-8 5 q 8d5fr(escf3infvkg box and a desk are 0.403 5 ndffc88svfqr5( ei and 0.30, 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 plastic on wood are 0zf7x/c k9( rtbq3f1 th.50 and 1zc7xh/b(fr 3qt9k tf 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 slowe.1zit:. qkkqpoq* 7ks and comes to a stop with a constant acceleration eq*oq1i. 7k.qp kkzt: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 forcel vc oo11b7*p+xlw8aj c,mjzan* u9x .. A 3.0-N friction force retards the motion. What is the acceleration cu 7 xcjw1mjozna plov.1+*,*x l8b 9aof the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest s,9 oq;) nnq*mrbqyfh4ys*d .5o9 kmy, 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 amq+oe -h3,6sgow(f -c3b n lsvn initial speed of 10 m/s. It slides 50 m on the ice before it stops. Wha3(g m3shq-+6 svcleonow-fb, t is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, pols61gh xaek/,himc* 9 dice find skid marks 90.0 m long. They determine the coefficients ,1xmk9 ig/ad6echh * 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 3m7bp oygl:7v2y 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 is rough. If the less massive bo :go7py 2l7bvyx 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. 226aewga1oy;y vedt , bv0n bhl0)e0o(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 slng 2w;0edv6yltyba,)ev eo120 0ao hbide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionlew :: j qe4h3tq/h1t:llylq.7ab hlf 9ass inclined plane. The plane is inclined at an angle of :aheb1l34qtlwl jalqt :f .hh /q7y9:$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides d rqt(dk:-noaqie8g6t - f n:0wown 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 axz dcovluk:o 9.0h0l 6 smooth 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 tiltedks.e /wi3u9+nvb17 mbr, mjcl 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 coto -3ejs07bxdp: j b ; k7d1hund;wbj1nstant velocity of 6.0 u x7j0dbj:ps-;j1 n7keb 1 t;dobh3wdm/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 tw68x5 n0xzxd 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 slidespk9opzu7x3ti 6:+ b bx down a 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 w 9p);eb(arx gieighing 500 N along a rough surface. The cable attached to the log makes an angle )pibg r(;x9 aeof $30.0^{\circ}$ 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 inclinedlov qb;n d3dd.l.7xo297v+ zlym v6 dn plane tilted at an angleo 9dvod 3v.dvdl672lnl. y; xnq +bmz7 of $33.5^{\circ}$ 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 p5 03r8/ *lvljxrv s5m9aa-n6 wwq6z*gmkv zr gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static frict5w9jzxklrgvrl vsvaq-*5 p / wmm 86z*63r0n aion between the object and the plane?