Which of Newton's lap 2e1 7tyv;xvlws best explains why motorists should buckle-up?

  When you sit on a chair, i:7 sa;5vatrcthe resultant force on you is

  In the absence of an externals.7xfn*d/ti4 h*u)yfc bwy8 kj ir*3 l force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned o-egv wcff7 um:(0w5ds ff, while traveling in empty spaces5cw 0gmu7 -f(dfw :ve, the starship will

  A rocket moves through empty space in a str ixb2fjp:t8 d+aight 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 sustain its m+ f xidtj:p28botion is

  You are standing in a moving bus, /a kojy( ah*2fgk0ytd3g3sw0 facing forward, and you suddenly fall forward. You can imply(2jkyt0owga0 3*3dgaky f h/s from this that the bus's

  You are standing in a moving bus, facing forward, and you sudd + fwr*:e .7dvnttnj9denly fall forward as the bus comes to an immediate stop. Whatrd .* tdfw:+7te vn9jn force caused you to fall forward?

  A constant net force: b6 un c/wf d77uqy*blrd7tzvdv -g+9 acts on an object. Describe the motion of the object.

  The acceleration of an object is inveqtpsbp( e4tgl*;f l 64rsely proportional to

  A net force F accelerates a mass h p-w 4/9yuczpm with an acceleration a. If the same net force is applied to mass 2m, then the acceleration w/cph4 9 uz-wypill be

  A net force F acts on a mass m andys)joj)f()gr produces an acceleration a. What acceleration results if a net forcej)o g) jryf)(s 2F acts on mass 4m?

  If you blow up a balloon, mi:aray./4 udy / xk3+rnjn,h( 5b+g.esn tbsand then release it, the balloon will fly away. This is an illustratbn de4 yhk3g/rn5,+t/ ny( x.sjia.mb+rua :sion of

  Two cars collide head-on. At every moment during the collision, th1:gup5:wm zpge magnitude of the force the first car:1:g5muzg wpp 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 on0srdz nm0,6rz an object, the force which the object exerts on you wirrdz, m z006snll

  Action-reaction forcey.q.2te7 ms mvlu0 r*f qnr-y4s

  Action-reaction forces ar81ao 10puyqlbe

  A 20-ton truck collides with a 1500-lb car and causes a lotz.r yu,amn:(gh(dfhzo,1p j ; of damage to the car. Since a;nr z:(gdfh, ,mzuhj1y p(.oa lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object witrl xl ,/1)muhooc,)q:l;yniyzlf d3x a1)ee4 h force mg, which we will call the actionla/ lq1,l o4 u,hrfezm;o):3cnyi y) )lxd1 ex force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ealyi ),n qg belerwm3+c1ai859 rth pulls downward on the toy with its weight,1 qw8iea g+lymi953cb n)el r 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 3,di-huk0 l vv x1t6pfa 1500-N instantaneous force. The ball hits the bat with an instantaneo kvv13lxh6t0 -ufi pd,us force, whose magnitude is

State Newton's three f ;3kkq;y- plyhggwlal/v03a fk, 4 7olaws.

  Mass and weight

  The acceleration due 906. eu yijc*vtv6 lx :o2tqerto gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut ot *jv co:6u09yiqee l.x 6vrt2n the Moon's surface, compared to Earth?

  An example of a force which acts at emh+ s d3.-(kmtvyjb-a distance is

  Who has a greater weight to mass ratio, a person weighing 400 No9 ) sck.8d.ji5(sdyr :sr2fn /nf2 i o5bxmsu or a person weighing 600rbossi5(: x jf r/on m5.i8kdfdcy9ns u.)2s2 N?

  A stone is thrown straight up. At the top of its path, the neoo n4m q;utgw7-q 65tut force acting on it -4 u7tmogn5;o6qquwtis

  A 20-N weight and a 5.0-N weight are dropped simultaneouslyzr13vo tr u wh+4m:fdg0b;begm y ,/k;a/, odm from the same height. Ignore air resistance. Compa3;moddoz:fw, gmr he;gyu4 / ,+0 kbabr1t/mvre their accelerations.

  A brick and a feather fall to the earth at their respective terminal vn* b (yu6duwm-elocities. Which object experiences the greater forb*dmu6 w-n y(uce of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. Tujz4lj7 2*avcu d-m-h he elevator is moviz7dl 2vjuj4uh a *cm--ng up at constant speed. What is the tension in the string?

  An object of mass m is hanging by aos, : proc4:qv 3e;omv string from the ceiling of an elevator. The elevator is moving up:o;p,v e 34ovs: rmcoqward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy 00sxbfwws8e1xm b 2 i6sidewalk is

  It's more difficult to start moving a heavy carton;l2arq 4 8. efr5efvne syux1e y5;en6 from rest than it is to keep pushing it with constant velocity, becauxf e15n v ener;2yaf sl4e;.5qe y6ur8se

  A horizontal force accelerates a box from red+2;nqt3w5svm m8svjo yoo93 st across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happetqvyv+8 n3s;mm o9w25j s d3oons to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus exxcno0/ /ouqhg d;.. we can dedd ux/cx.oe/;hqg. 0on uce that

  A block of mass M slxdm5pok 0 0ge ro8m10c 2p)tbzides down a frictionless plane inclined at an angle q with the horizontal. T0c8)1pgx5tom k 2em obpd00zrhe normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle qao azy k*)n0xv54,s xn with the horizontal. The normal reaction force exerted n*50o)n zvsx ka 4x,yaby the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined af7 7df9k2h ;xhuyoc1hvpj u 5;t an angle q with the horizontal. The grav5 xjk h1cuvdu h2fpf; 9h77;oyitational force is directed

  Two toy cars (16 kg and 2.0 kg) a 2(dni:d oa8ii/hb9 oymf(oc+re released simultaneously on an inclined plane that makes an angle hfodn+i( md2ic:9o /by(ao i8of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a fr rj5:gz)ub ,bqk9 qv6sictionless surface. A 16-N force is applied to the object, and it accelerag q s)urzb 6,j:5bkv9qtes 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 haw-n hi,.a.hdcky(f;1q4yrc n/jd 7.0 s. What is the average forward forcdh a; (.4/.d,rcihk7nnyjwcaq f-y1h e on the car?

  Starting from rest, u7y73422neb1xof3wh*2je mpgqk nwl a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting43w*q3hfnm gjykwu 2 b227lp7enex1 o on the body?

  An antitank weapon fires a 3,p 0gizkg fi33.00-kg rocket which acquires a speed of 50.0 m/s after travz f, 3gk0igi3peling
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-k-cgb e/d wtz6*g mass from rest,- 6 z/c*wbtgde

  What is the mass of a person who wex0*vn q m6f 6zs3lne7wighs 110 lb?

  What is the mass of an object that weighs 250 N on the sur55ei t;bblt(q:e)c s( k/ owlxface of the Earth where the acceleration due to gravityisl tobkxwt;c/:55e eqb(l )( is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object oa.k o hc66vsu.8x x,otn the surface of the Moon where the acceleration due t,a otco86 6hu.v. ksxxo gravity is only 1/6 of that on the Earth?

  Object A weighs 40 Nzs .,fv)r1jji1paykei+ 2 j5mz4x-z v on Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one+5v1s-jkijxjpeyz),a421 v.f zir mz sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pullinm2 a0ddx th4vc qcxe +e7w9+3zg on opposite ends of a 5.0-kg rope. Sue pulls7x0md xethc+e3z v29qdc+w 4a 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 leys sh5nx 6u93* nvmy0ovel frictionless surface. A force F acts on the ssyn9 s5nho6x3 v*ym u0tack, and it accelerates 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 scalpzsc*e 5c4 e,ce in an elevator. What will the scale be rep*c4 zce,5sc eading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides r.o6g g .ex. tqyud:r:in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward wytxrg .q g:.ruoed:.6ith an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an 55r6d:gnllpw, un i*q elevator. If the mass of the person is 60.0 kg and the elew:p i6,u5rqn 5 ldnlg*vator accelerates 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 ma/hxebx. exnayz,+),i p57m-k4joqw ass. 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 the ma7,x jbx/.mh ae4yoiae,)z5 kwxpq+n-ss?

  An object of mass 6000 kg rests on th5iw( vngf6 v87moy,k ne 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 distance if the load is , w ykvgvn5mfio8(n67not to slide forward into the cab?

  An object of mass 6000 kg rests on thk)exu+k a*4aj5 z:rr ne50 xsce 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 if the load is not to slide arz 5x+rjaku 54cne)sx:0ke * forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, f3lcq 2g/zu,zn upd1(what is the mau fq( lz/n3dcg1,2 puzgnitude of the acceleration 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 *okivz xvsj-q6 )6 7 ;hzdebk5m = 0.40 kg, what is the tension in the stk ex izs;qo665)vk 7-vjz*bhdring? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal fz tfb8b9m.9m -oed8/fg ig,ss loor with a force of 100 N in a directionsg 99 febf8momtz,g8-d .i/bs 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 horizont7apu3 9uzq qrd9wnq+c ewdh4(4l- 1q e9q3xexal 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 normaph3 q 4ezw 4de93q1d ar9uqwux7ql+nxe-9qc(l force on the box?

  A traffic light of weight 100 N is supported by two rophkpfd dx6yt9una00x( 6f 3ki;es as shown in Fig. 4-2. What ar0kn9( uh0 3id66tyf; df akxpxe the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass : f l6v*utp3poof the traffic li:t3pu 6 f*olvpght?

  Two boxes of masses m and 2m are in ej-egvq 3c.6jt5x0 s icontact with each other on a frictionless surface. (See Fig. jqs -v6t5 ejcg0i3ex.4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a friction/d)eh l 9kjl y1*itdpbmb6e4.-s 4s imless surface. (See Fig. 4-3.) What is the net force on the more mas4kyedi4lbssdt9j e/1h ml.6mbp * i)-sive box?

  Two boxes of masses m and 2m are connected by a rope. ou 0s.hf+eo2vob;pt0 (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectins0eop+fo;.2v u hb to0g rope?

  Two boxes of masses m and 2m are c72am(ts ml;ys4+3ze zrq( hem onnected by a rope. (See Fig. 4-4.) If the forward +7lz2rths3az(;emm 4yme q( sforce on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord b wv naoz7q03dj j7b,wj9f52 trunning over a pulley as shown in Fig. 4-5. Box I of jq,z dn jt0wb7 woj25fba79v3mass
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:g-r lpf :rpn *qja9/f 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 horia/-r lrf pqg9:p:jf n*zontal force is applied to the box?

  The coefficients of static and kinetic frictions fo m88 j/fplgci89vt4el r plastic on wood are 0.50 and 0.4g88/4 litlpfv mecj 890,
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 directhqf,5-c 7ce mtion. It slows and comes to a stop with a constant acc5cfeq7 t,mch-eleration 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 f1 53r ztj1vqy zi.0gddorce. A 3.0-N fdv3i.yzjqd 0z1 5gtr 1riction force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 ri9ig4 p5v:ncN accelerates 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 given an initial speedbe8ck*qtqkk,): -wuf of 10 m/s. It slides 50 m on the ice before it stops. What c:tfe, qk*-wb) kku8 qis the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.kzd6k-+mr13osk rbi :0 m long. They deterbmsoi+ k: kr1k-dr6 3zmine 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 surface between g w,p4s-gyd8j the more massive box y-gdws8p 4,jgand 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. (See Fig. 4-6.) The surface b, xezn7xfzt *99v z1eketween 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 thezfe,7nvx99* xtk1zze more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined pi ,u713suv7p qvg2rx8 an f7qilane. The plane is inclined at an angle o 7 8i arq,3fpu qi1g72nv7vuxsf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an 6kqv5u.)2: sdyyb ran 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 bv(c*sg; jnv+ 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 i0rju- gpysz wd q5ar3 h,x:y;/nclined 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 directly down an inclined plane, at a c)p xmbk/+fhux;m29j constant velocity of mj9f+ puh;xcmk 2/ xb)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 roug)wmcyhqk6a s ,/ocg /0h $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m sl9j1 8 wrf0udjji xhz8(.yokav z51go6ides 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 weighinkrsy()63ioo jw .(rf tg 500 N along a rough surface. The cable attached to the log makes an (iw ofj).( o3yrs rtk6angle 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 inclinedbyt yv* ih,nb6y08:8pkzp 7edb ;n :kh plane tilted at an angle 8by: :izy epb*kbydh nkpnvt, 678;0hof $33.5^{\circ}$ 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 g39hstf99 mtchradually increased until the object begins to slide. The angle at which th399tmt9 sfch his occurs is q. What is the coefficient of static friction between the object and the plane?