Which of Newton's laws best explains wt5+ijt6b tds9 os /v/mhy motorists should buckle-up?

  When you sit on a ch vt q+dzep 1gpl3n6f39air, the resultant force on you is

  In the absence of an extern+kr vm6;- nneh,6 nypual force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sudd 6qr,bp.. ov0kcs+ vnbenly turned off, while traveling in empty space, the6q obsvcnr,0.pv. bk+ starship will

  A rocket moves through empty space iwvvgz3) 6 (zzjq 6t;kbn 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 applied to the rocket in order to susta ;3t 6gk)wjbzzzqv6(v in its motion is

  You are standing in a moving bus, facing forward, ansm:7sc3r; tk+l) ay vghb*(ab d you suddenly fall forward. You can imply fro7 yv*lkarm( ) cs;3ag+bsbh:tm this that the bus's

  You are standing in a moving bus, facing forward, 7v)1. 5: khrcyv7az rsc q/vjmand you suddenly fall forward as the bus comes to an immediate stop. sv 5cyz ) jr7vc/q1m va:.h7krWhat force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the o8tzjs n,tgh;8bject.

  The acceleration of an 9 u r(6;7d(p:seyzol )c+ld5fbye:loem w*ooobject is inversely proportional to

  A net force F accelerates a mass m 6ol9y8pa 6q-cr;fd, sx nic-awith an acceleration a. If the same net force is a-x nfc6o;caqslr8,diy-p 96 applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m wosxqb0h qzf/rv-jw33 d zhzz5 +:z,:and produces an acceleration a. What acceleration results if a net force :q0dhbzww xr ,zz3os/-5z j h:fq3+zv 2F acts on mass 4m?

  If you blow up a balloon, and t- h rtmlc3a),nwt,k8fhen release it, the balloon will fly away. This is a,akc tfw83 mr ,hl-nt)n illustration of

  Two cars collide head-on. At every moment during the collision, tcdc1(ge +t2o lhe magnitude of the force the first car exerts on thgto1dc+e (cl2 e 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 objecvsz5(is(,i+qao q *z it, the force which the object exerts on you will * avs(ioz(+ziiq sq5,

  Action-reaction forcew8 ,,jxnb.vgn s

  Action-reaction forces arec/ydp5jk e *rb per:2blfh ye6q 5)35w

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the -rcqwx));*d(.;)flttznz ptz6z vti car. Since a lot of damage is done on xl)tzz;tf *nv6w(t d- c z)pr ;iq).tzthe car

  An object of mass m sitpy p.1mo8 y:rds on a flat table. The Earth pulls on this object with force mg, which we will call the action fo.r 1 mppdo:8yyrce. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a strsp eo330adh5 wv au e7,hmv82wing. The Earth pulls downward e duhw35 0v7am,8e2 w3osvhapon 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 force.jafwl1 k-r7a u0mnl16 The ball hits the bat with an wf6 uaklnmj1a0rl71-instantaneous force, whose magnitude is

State Newton's three lmt6m nrza 2/(m3sn *jhaws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon tha/o* (xe+-qvu odlco6z :mcz(en on Earth. Which of the following is true about the mass and weight of an astronaut dece/(6(x+zo qcuo mlo-:zv* on the Moon's surface, compared to Earth?

  An example of a force which am3rcv-b n 2z -nv49gb jwx;f4gq. ut.jcts at a distance is

  Who has a greater weight to mass ratio, a pxu4 -0a2s(/ntlowjcj erson weighing 400 N or a person weighing 600 Njl(oj 0wu-4/xsc tn2a ?

  A stone is thrown straight up. At thbh)rdt6o .,7felos )ke top of its path, the net force acting on il 6oretf)d7ho,kb ) .st is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the saruz,1jomq:k. n/h 3gwme height. Ignore air resm1wk,n3j uh /ozrg:.qistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal veloci51fomyr yq cf m, e0dm(l0u,2wties. Which object experiences the greatw20um5fly(f1,0mmc, e ryqdo er force of air friction?

  An object of mass m is hanging by a string fromdc; )hony *ys* the ceiling of an elevator. The elevator is moving up at constant speed. What is the tn yoh *;)*dycsension in the string?

  An object of mass m is hanging by a string from t.1e 5dc0 ffkwi t;knfwl,0z ;whe ceiling of an elevator. The elevator is moving upward, but slowing downwf5,0 kwen;ldi; c1 k0f.zt fw. What is the tension in the string?

  The force that keeps you from s .a*s;xtyic2 yliding on an icy sidewalk is

  It's more difficult to sta9nsfvp0c o+ cm4) a6dm8:4relh+za yzrt moving a heavy carton from rest than it is to keep pushing it with constant velocity, m0 84yr 4al6 hzoac+n)p9cv :f d+smzebecause

  A horizontal force accelerates a box fbcgc m7(n0.uerom rest across a horizontal surface (friction is present) at a constant rate. The experimebu mgcec.(7n0nt 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 a7jsidj 7+ydpz/cd 42ramp at constant velocity. Thus we can deduce td7azjcsd4+/2 7yp jd ihat

  A block of mass M slides d xzz)pd4 -y:kwown a frictionless plane inclined at an angle q with the horizontal. Thk:yzz)w d4-pxe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at /rs0fa t/,tso od611 lj vqanleo7/,zan angle q with the horizooaz6j/tsnvela,l /otr /1 f7d0 s,oq1ntal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an a vt orayt5bom8;zm: 2s;; 4bbmnfb4-engle q with the horizontal. The gravitational fo4eam; s8bt5f :o-;2vrz tmo m;nbbyb4rce is directed

  Two toy cars (16 kg and 2.0 zz tj-/ sm33rzkg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement wh3 zjt/rz-zs 3mich best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to t5kl hz0 k0tcfj/ .qfm1he object, and it accelek 0ftc0lq f hk/m1jz.5rates 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. What2ul:)4 +(j pmkmziqnhevr n1, is the average forward force on thejuirzm:pn 4e +nvhm2 k 1q,l() car?

  Starting from rest, a 4.0-kg body rex83f*gtept vdo n12d2aches a speed of 8.0 m/s in 2.0 s. What is the net forcex* nddv83o e2tf2gp1 t acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.6stug 7lvn 8 tdg* bk9s58ip drhs/,z50 m/s after trav9tsd8b7 gn p,6zgr8ksiht5 s udlv/5*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 push a 10-boy ;p 3wi87ffkg mass from re3by7if;f p8wo st,

  What is the mass of a person who weighs ga) ul ,d:egu+110 lb?

  What is the mass of an object that weighs 250 N on t .z+kh sxm8ns)he surface of the Earth where the acceleration duemk+)s n.zsx8h to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object onkejxd)g;-yg 49ccr i- the surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Ea kc;-gi erjy-)dg 4cx9rth?

  Object A weighs 40 N on Earth, ahxa3*isf-sqx3n7i( n nd object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compareh -as n3fns(*xxi iq73 the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite q;vnmk9d gp u,zl5u zvs495l 4ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelzvlk9;9nv, 5 m4 g4szdul qup5erates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. c tj l*le vbg6,l3*px;A force F acts on the stack, and it accelebp*6l3,veglx l j*;ctrates 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 ez w( .8iiczu adf01(jllevator. What will the scale be reading when the elevator is accelerating downwa (0.1i lufcaw8iz( zjdrd at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of / 49jmagw wds.ibtgvve6 58; xthe person is 60.0 kg and the elevator accel4d9b m5gtj as;i8xv/e .6vgwwerates 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 o46 p*yeo s0ums4sn * c-gk)hnnf the person is 60.0 kg and the elevator accelerat-nsgnehsyc4mu )4o6*s 0k * npes 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 force has a magnitu2(f (5/evf cdpee c+s y4rr+kxbv)8imde of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. Wh)(be +dsk2xe+8r e(c c iyrpf5/mv 4vfat is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed ob78esw,8 pm+;uoai yegj8 t(hf a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s,w8e+e (h;7gtyumi8po8 ,bs a j what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 k9k wx)u 06ig lqk6::wws9cxhgg rests 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 is traveling 15 m/s, what is the minimum stopping time wx:9c6s)i :wkg qkwuxg9h6 0l 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 t+)5ew5yjru3o /vzsb m = 0.40 kg, what is the magnitude of the acceleration o+) 5ost3uw vj/z5rbe yf 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 kof19 6 ykhosb(cl38mkg, what is the tension in the string? (Ignore friction and the96 o38mk fscokl1hb (y mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor witcpqcb3 y 5yepr88,av,h a force of 100 Nr c p8,bpeyvqc53a y8, 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 forc n7pv;p. hp rpp0kd/2ve of 100 N in a direction of 37.0e above the horizontak;pd r. v270p p/pvnphl. 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 1 f c* wocwr+qv0)va9mhq( lo5m- akk j/r8wd)supported by two ropes as shown in Fig. 4-2. What are the tension0wrw l8 *h5d+km rfwaoc-q1ocav(k) q9/mv) j s in the ropes?

  In Fig. 4-2, if the tensions in the ropes areqnbwh680yyzu 4n z8lq 8 jgb.3 50 N, what is the mass of the traffic ligh388qw gynu84by0h 6 l.bzqjnz t?

  Two boxes of masses m and 2m are in contact with each other on a frictionlesvgw//sem m/*s8yb j8g s surface. (See Fig. 4-3.) What is the acce ggbw/vj8m * /8symes/leration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othei n4wi4bu /-seats, .lr on a frictionless surface. (See Fibi,sw e4l.4i a-s/untg. 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.) , 5i4n) 0sqrkr hj2+qtoh )zwj If the forward force on the more massive box is F, what is the tension in jw r05rthisq4,z o)j2+qk n )hthe connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.* lfj4o1flfch ,et k92) If the forward force on the more massive box is F, what is thejfcl,kfot l 91e*4f 2h acceleration of the less massive box?

Two boxes are connected by a cord running -r ,y+2whnzev*3tn9wta6r ke4 bc,lwover a pulley as shown in Fig. 4-5. Box I of ma n2-e ,tylh4*vwzcat3,e+6 9 wkrbwnr ss
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 a -a/p+uejrqlmyc :tec;k w7 *:nd kinetic frictions between a 3.0-kg box and a desk :m/ cr:7e wk;l*-te+q cyapuj are 0.40 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 frictigf;sj5yj* hmg f q zdz*9/:qm.ons for plastic on wood are 0.50 and 0.40,z9mm*5jsq:;qjz.g* yf hg/df
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 d y7z6p 1rnd6(oam-tlo6cv e)nirection. It slows and comes to adl pmntzo e)(66-1yn c76varo stop 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 hnte(s.4f qw7+r fe sk3orizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration ofr.s s 7tfefnk(q4e w+3 the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rtq ,x )gx)tzn7est, 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 10 m/s. It slides *)n:xfrkk v-d50 m on the ice before it stops. What is the coefficient of kinetic fri*f kx)- v:drknction between the puck and the ice?

  During the investigation of a traffic accident, police find 7uwif7bx , a3fgrhb/.skid marks 90.0 m long. They determine the coefficient of friction .xbu7 /h7rg,wfbf a3 ibetween 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 surface betweegfd 2ejf8vd(g -hri .58lh9ey n 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 friction force on the less massive8 jg g-95 fide2dh.l(feyvh r8 box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface be9fg-,l ts k: :k+p;xi rxuf;gatween the more massive box and the horizontal surface is smooth and the surface between the boxes is rougtsr;:a,xfk;g9 k f x:ugilp-+h. If the less massive box does not 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 inclined at an ano ;l9inn.0 kyu5i s.mt7:q,b/dmszw sgle ofzwm0d,ob n5y;k :i.su /tm qns7si 9l. $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill thad7u5rkess+1b gwae qf 6wy(2+t 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 smouniuu 2um: rrnrynz ;z).17gkmac ** 9oth 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 at2zqr/u73swc l 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, ab82 aqcsz/k n2t a constant velocity ofz8/ansb 2ckq2 6.0 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 down a roughaiz)dga4op; - $37^{\circ}$ 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 roa/ +4;hkq glldh9gq /eugh $37^{\circ}$ 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 surface. The cable attarsp-cubl: k*71 +e kyache :+ryc7* k akbuls1p-ed to 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 releu+ cdn)j3dayhx:a c,;ased from rest on a rough inclined plane tilted at an angle +cdjhc :n u,yax) 3;daof $33.5^{\circ}$ 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 /sydi mc*3. 3xmqa6 alof incline is gradually increased until the object begins to slide. The angle at which this occurs is q. m6.ac/lsq3*im3x day What is the coefficient of static friction between the object and the plane?