Which of Newton's laws bescyukx +m4v0o3:7 4w/ot-i - h7 tg9sl dsrkyrjt explains why motorists should buckle-up?

  When you sit on a chair, the resultant fo:cxs5y: zjs9u cg(m- drce on you is

  In the absence of an external force, a movigo fsxyyl7 w0 -2e37 5omjooi0ng object will

  When the rocket engines on the starship NO-PAI5t31m pvy63 (ih-w y+6t tpbpt nnqa6bN-NO-GAIN are suddenly turned off, whn56pt 1py btqhw 3a-mttn6(pv 6 3yib+ile traveling in empty space, the starship will

  A rocket moves through empty space in a (e5n1g1oh8ulye- tlmstraight 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 in8et11ohg(m-e5luly n order to sustain its motion is

  You are standing in a moving bus, facing forward, and you qk5 :ql* o 7hrjc,t+7yg.wjje yh2olv- +x.vrsuddenly fall forward. You can imply 7kxqtyvyq l-5jehrjg2r w +lo. ,*j+ :.cohv7from this that the bus's

  You are standing in a moving bus, facing forward, and you su.mgk /lxa etna)*wp/7ddenly fall forward as t/nw7eg/ l*kxmt pa ).ahe bus comes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an obj dnr:d:fvchly.i557 hkc lgut1f-7w /ect. Describe the motion of the object.

  The acceleration of an object is g) rxza-, ,kxpinversely proportional to

  A net force F accelerates a mass m with an accel8 mud6g9bs0oqj:ctv1) su. m eeration a. If the same net force is applied to mass 2m, then the accelv:8dqub.gsms 91u e0j) mtoc6 eration will be

  A net force F acts on a mass m 2w-qo v yz:w19+z5wq:l zs0lq+cx rtland produces an acceleration a. What acceleration results if a net forcez 0+l vcoz:-wqqyws+lwqz r:xlt5291 2F acts on mass 4m?

  If you blow up a balloon, an-dbjbispbty(x idz3b)-2 c 26d then release it, the balloon will fly away. This bbb 26(dycj sx t idbz-i-2p3)is an illustration of

  Two cars collide head-on. At every moment during the collision, the magnitude o+ w2k:didxs0if is:i 0xdd w+k2the 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 an example of

  If you exert a force F on an object, the forcj:)7wkr l nyo0pl-4oc e which the object exerts on you wicny)pr0jk4-l: ol wo7ll

  Action-reaction forcesl )liz2;dohcj7z6c q)

  Action-reaction forces yn: (w+ofhl,owa7 ab h4g66leare

  A 20-ton truck collides with a 1500-lb car and causes a l0nqa: c0l00ymakpm 2c km3yq hl7k;x8 ot of damage to the car. Since a lot of damage is done on tmqla:k3xy7my ; nk0lc00khqa 8cm2p 0he car

  An object of mass m sits on a flat table. The Earth pulls ol0 h,3nnnd2( ix(nkujjux. m *n this object with force mg, which we will call the action force. Whatjd.x nh umn 3*0(jlu2nk(xi,n is the reaction force?

  A child's toy is suspended from the ceiling by means of a sg qa8zd,us)f+tring. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force,",u d )fasqg8+z what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N i7d* qcj7ai2ay0vqjz :3p m/ihnstantaneous force. The ball hits the ba 7jaad3 cpm/vhjz7yi0q *:qi 2t with an instantaneous force, whose magnitude is

State Newton's three laws w,i1 ir7 rj(tdg/a npgus)x5mn 8)pe*.

  Mass and weight

  The acceleration due to gravity is lower on n0g :z2(xrkpy)c +ixpthe Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?ixpry:nk+(xc gp2z0)

  An example of a force which acts atwv26.btg0 sdcn+ m lj, a distance is

  Who has a greater weight to mass ratio, a person weighilwdn +qb6( wh8ng 400 N or a person weighing q6 h8n wl+wd(b600 N?

  A stone is thrown straight up. At evz 4(9v285kj a2vbgf,7cfv7ynodymthe top of its path, the net force acting on it i2 ya7,9fcvvv8(ogfm n2d5bj 7vzy 4eks

  A 20-N weight and a 5.0- yj)thjvm7/4-7 yhpm g9*mdpuN weight are dropped simultaneously from the same height. Ignore air resistance. Compareym4p- uhhv7 jm 7m9d)ypg*t/ j their accelerations.

  A brick and a feather fall to the earth at their respective term(li8ts4ueq-7zjl*c3jtb e/ 6 qyn . tainal velocities. Whiclnuettq3sjyj .lt/e (8zi*a- q4 b76ch object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling atxifssrxc: 8u( ,36iof an elevator. The elevator is moxtx u:3,rs6ia8si (fcving up at constant speed. What is the tension in the string?

  An object of mass m isi iydzr2 r.q,a44/m2c- guroj hanging by a string from the ceiling of an elevator. The elevator is moving upward, rjmacdiy4z4-2rrqgi o.u2, / but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewalk ix-mdtz2 tul +2s

  It's more difficult to start moving a heavy carton from restt5b luykt cv(6+co-+k than it is to keep pus cclk b +5(+vtuko-6tyhing it with constant velocity, because

  A horizontal force accelerates a bh(4v fr:rzi.4egz- rtox from rest across a horizontal surface (friction is present) at a constant .hirv:(4fzet rrz-g 4rate. 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 at constant velocity.8ujv 8 cfc*cd9 Thus we can deduce thc8v8 d*cj9uc fat

  A block of mass M slides down a frictionless p. wrb ):bhrinq5u*))z drcvv6 lane inclined at an angle q with the horizontal. The normal reaction force exerted byhwrn5vz:*r.i c)drb)b 6 u)q v the plane on the block is

  A block of mass M slides down a frictionless plane inclined atzn,p9rh +n: u4-zngz.myqu*m an angle q with the horizontal. The normal reaction force exerted by the plane on the block is dir 4-r , z*:zy9gnqhnz+ u.mmunpected

  A block of mass M slides down a frictionless plane inclined at an angvea8a)me.9 tvle q with the horizontal. The gravitational force is d tevvaa9 me.)8irected

  Two toy cars (16 kg 9mlc jivdfrytb4- /v ow4x 043and 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the hor t9-l0i 3 4 vmbvfrywoj/4dx4cizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionleswpuwtk-e0 xfae1 .z-)r:e z8ys surface. A 16-N force is applied to the object, and it accelerates a zwx1p)w:a-f e 0eu y-8ktr.zet $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acceg,pir 1aljpo3yh 8;zss7im /z0 n53h ilerate from rest to 27 m/s in 7.0 s. What is the average forward force on o/,z7iih ippsly13na 3j ;8 rzhgms05the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 + ,v*ur4 wklz4;dfnx zs. What is the net force actingx*z; k4l4nz,vd fr+uw on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed ofjwd7+pckue: 4 50.0 m/s after traveu+d e p:j7kc4wling
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 v(u rev/m,q)5f(j uo2ra;bj tyou push a 10-kg mass from res,jromb (()uv2 5/aqeujrtv f;t,

  What is the mass of a person who weighs 110 lb? atyov367 i*fggqk , ef1 5jx8rnilz);

  What is the mass of an object that wevszv(m o)2sx :n*ifst c3+fi1 ighs 250 N on the surface of the Earth where the acceleration due ts) f2:n(3szist v*i+o f1xmcvo gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of theiv uzh4jq ew1va,s34* 0 e9qeq object on the surface of the Moon q 3wvv44 eqae1 e0,*sqzi9hjuwhere the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weioiou +- sdqa6dg:q5l q dx0l9*ghs 40 N on the Moon. The Moon's gravity is one sixth d5g6+o x9a0 -lqso*dq uidq:lof Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-*nm p y(auq+9 kl0w.dnwar by pulling on opposite ends of a 5.0-kg rope. u*y.n(k lw9md0aqnp + Sue pulls 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 F acts on the59ai)lwm0qiw stack, and it accl q0)wiwaim 59elerates 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 )-bm 4vrtt3cs on a scale in an elevator. What will the scale be reading when the elevator is accelerating downward atr) vm4t-tc3b s $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. l1 pxflfp*,j mq)+3s li a9z.z lpxv-( If the mass of the person is 60.0 kg and the elevator accelerates downward -mf 9a( jpx, p1l)piz l v*3fz+lx.sqlwith an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides l/pd 4qnk *)gvin an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration ofpd/lkgn4vq )* $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act o. v4(iwn rh5thx9 dz3pn a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force towp(z 39r.xwvn5hhd 4itard 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 flatbed of a truck. It is held in pla(m1q 0vuem o;fce by metal brackets t (ufom;mveq10 hat 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 *+fs bxlcx ys8) ,-feuis held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is trly-usff, sexx*+cb 8) aveling 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 m =zy/+ec qm(q /+xxbg b9 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frb9c/ +x qy/b (gqm+zexiction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = h:m yu9dkx l-+0.60 kg and m = 0.40 kg, what is the tension in the strm h+uy9k:-d xling? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a veu4gi w/il1, smooth horizontal floor with a force of 100 N in a direction/iigu l41w,e v 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 :dkaoczpzkd 4i/4oc9.( 3jsf floor with a force of 100 N in a direction of 37.0e above the horizontal. If ts4(ja .zo z/: 94okckdpcfi3dhe 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 (3 ks9r w 5m-f-kics) +qyi*jppyib-wis supported by two ropes as shown in Fig. 4-2. What are the tensions in t-i+)skjk-y 9m5bf qi(p3piysw*- cwr he ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of th0+xl0*,(hx e qn lypqc6weoz /e traff+lxl06xe*qyezncqoh(,p / 0 wic light?

  Two boxes of masses m -b993a7wdceyea kn z,k /kcdiv g9b4 4h2cmm2and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3bn3k/ cih2w a v9 mz44cem7d9abke 9c,gy2-dk.) What is the acceleration of the more massive box?

  Two boxes of masses nqcvywkg)b pvbi.7 . z,41h r6m and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.)qgh .rnp46bk bv1.v i7)w,yzc 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.) If the )9i7ahb3 ,kvc2 x4y2mj vs hyf8xpz0q forward force on the more massive box is F, p04bk c2xfs 37m,qyjy) ahvxh9zi v82 what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. qevag5:3pxyi3* hz.r (See Fig. 4-4.) If the foy33pz5a vg *e qh:xir.rward force on 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 show0z, 9w 7a*qjpulnba.dn in Fig. 4-5. Boxu ,.*z 79dwjn la0pbqa I 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-(zx.w w ba5ki a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is appl z5iw. -(kwaxbied to the box?

  The coefficients of static and kkf:3uwt+0 fp58 zf 2lp1ws azuinetic frictions for plastic on wood are 0.50 and 0.40fk a3zwf5+12lpsu :f0w tuz8 p,
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 slo icvdaclio4 *, m;n)u n;g/(lfws and comes to a stop with a conn ca;i; dlmul,n(ifvg4* )c/ ostant 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 3.0-,citiv4 k)a* xN friction force retards the motion. What ,tv4 ixi*)ck ais the acceleration of the object?

  A horizontal force of 5.0 N accrbz. : -75tt .btixj.qky)lhmelerates a 4.0-kg mass, 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 pwp(mf mmi+6 nxm4.i4given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction betweenw6im4mp p n f4(xmi+m. the puck and the ice?

  During the investigation of a(l lm/pft/h8+s 0 vn- qwcf-vi traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the /wc/h- -n lt si lvvqf8pfm(+0car'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 betwee; gm erhczh7u4 +g k,fx0-.qmen the more massive box and the horizontal surface is smg hrm xq0;+f.7, gzuee- ckh4mooth 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. (9xms wwibx2rb(2:t1t ,ii 7k49f/ ul+lv mpxkSee Fig. 4-6.) The surface between the more massive,92(strxm74lxuwxm bkbl p2:ivftk i/9 wi+1 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 coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane isc cv a*tm/-qy vhg2/w7 inclined at an angl / maq hwg2cvv/*tc7y-e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flab1h02 q6unpld k+( rlat 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 smooth inclined plane with s; 4 xpvwvu y5b x+iyu(6v-vrcohv4k 1bv0d19an 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 atkqem5 yb4r8 m zcap9 d3;og,6k 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 const9j/ .verebdr e; r8w+n:zlhl 9ant velocity of 6hrd9:ezv; b er llre+/j.n89w.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 rot3efw1lo u 4ho*jp:( 6p+sgqnuku*2nugh $37^{\circ}$ 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 db j/t) 6t0nkpzown 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 weighing 500 N along a rough surface. The cable attalwurzp((kri n -:( vea)u29 olched to the o)9nr ev w(ur- luzp2(:lika(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 inclined plane tr)zi )kg8otayyfv.. c :b2s 5milted at an angle o5kbf 8tsvycg m.2 r.y: zao)i)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 planci*2 ;kv)n5zi9/ xi gc 9wbe/ ,gyrsmme. The angle of incline is gradually increased untim n gc*r2;g/ 5 ieymibcw9,x )kvs9/zil the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?