Which of Newton's laws /zh0):kqi.(x::ulav ylydw rf)l6*knjh+ dp best explains why motorists should buckle-up?

  When you sit on a chair, the resultant force i ckdhtxdwt(/ c853 t9 v)dp(gon you is

  In the absence of an external force, a moving obp0( c-i d+gavbject will

  When the rocket engines on th )07* 2r.o3pl h)il ipvauf8gstqrxj+e starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in emrpas v u3oj.7*pl)l 082i )tirhxgfq+pty space, the starship will

  A rocket moves through empty space in a straight lin3icq; 4gz j 2)wbyyprozo:2s1e with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be app3b:szq ry)1po ;g2 4iocwyj2zlied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall 6hwsuu23 +qs tforward. You can imply from su2qwthsu3 +6this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly falu 27jz.wzy(*ctwt)qx : adea8l forward as the bus cod(27tqw zc y8tzaj. w: ue*ax)mes to an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe thej gyor* t*.ba- motion of the object.

  The acceleration of an object is inversely proportional tx,ks;7s xys uktr.f75o

  A net force F accelerates a mass m with an 2dg;1n s;twaldiz-3s acceleration a. If the same net force is applied to masslni1d; stz2d-sa ; w3g 2m, then the acceleration will be

  A net force F acts on a mass m ande7 9i):p*wr ftdy9iox produces an acceleration a. What acceleration results if a net force 2F acts on mass 4t:9 oxf*e 9y wid)pi7rm?

  If you blow up a balloon, and then release it, ti jy:uw6 ,7oj519 kebnd nvf+phe balloon will fly away. This is an illustod bpnnwyj+v:u1,jfk 967i 5 eration of

  Two cars collide head-on. At every meyv k*ghy03j. oment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the forcey 3jyk v0.*hge the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the oblu4iu8v+t 7c nject exerts on you wil78tuiu c+vn4ll

  Action-reaction forclk di/1v96pqtvv9fc; es

  Action-reaction forc :kgb+uwclghv d9,d( -es are

  A 20-ton truck collides with a 1500-lb car and causes a lov5-zpxqd m )) efjs1*lt of damage to the car. Since a lot of damage is done on z- 1lfqdv j5mps)e)*x the car

  An object of mass m sitsrk .-og( zyp(m on a flat table. The Earth pulls on this object with force mg,kgzrm(p. y o-( which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ear fpki(i*u1,m6+ ykkco th pulls downward on the toy with its weight force of 8.0 N. If this is the "action force,"c6pu+o(mki1 kk yif* , what is the "reaction force"?

  Your bat hits the ball pitched to q58 w1) lpw0 gs.fkblsyou with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magniwk fq15spbgw.)l08s ltude is

State Newton's three a9mqzw +qvkt:u6( x .ht o8+dkzxq40m laws.

  Mass and weight

  The acceleration due to gravity is lower on the M -,1h t z*dyntk2,z t/)5qiwqm 1ktqrioon than on Earth. Which of the following iy,tit1 qqk /tiqr5dh*t2z - w,1m)zkns true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distancy:ni 4t/wx5 y.bx-dp( .rs qrp6q /frqe is

  Who has a greater weight to mw r2k wq9ytgen9cjt;:rpl1 12ass ratio, a person weighing 400 N or a person weighing 60 kycww2r9 2g1 q l9p;n1e:ttjr0 N?

  A stone is thrown straight up. At the top of its hxfd*t)cjjc7l c;5tlu 69 -h giocq;8path, the net force acting on iht69d -qjhli8co; ) j;cf7ux5cgl* t ct is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heigzv89,78ro tugr1ho t ei9ck-d ht. Ignore air resistance. Compare their accelerations.z 8goh9 c7kerd t, 9rt-ov1u8i

  A brick and a feather fall to the earth at their respective6ps2cx)p m-sgr8 s ugz ;-oiizwn)j.0 terminal velocities. Which object experiences the gr uzsojxwp- igpc0 . 8rsg)imn-)6z;s 2eater force of air friction?

  An object of mass m is hanging by a string from the ceilin)r+ od j.na*wa5ad;hcg of an elevator. The elevator is.hd;w)+ r cad *aaonj5 moving up at constant speed. What is the tension in the string?

  An object of mass m is hangi uav;8d .:m2fz6plddy ng by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the yp; :z2dmd6ldf.u8 vastring?

  The force that keeps you from sliding on an icy sidewal4tts7 , hpxhr;k is

  It's more difficult to start moving a heavy carton from rest than it is to ke81f.jjbk r;c f r gfnm,f18//wiierqg(jsz90ep pushing i,ggs0rrr / je.kf fbf/89c1;m fz in1ij q8(wjt with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontagz wrcrw*(l )ne0dae.: z0r 3il surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal foclgid*0a(wzrwn .re r0 e) z3:rce is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp r3lrm 0eulp/5at constant velocity. Thus we can deduce tlr e0rpl5/3muhat

  A block of mass M slides down a frictionless pa334 g) xhlkjqlane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block i34h3q akgx)l js

  A block of mass M slides down a frictionless stgvtiac, o:y t6 5g75g/-eh5 r;vd saplane inclined at an angle q with the horizontal. The normal reaction force exert ci- sv gtvg5;5ota7gdehts6/ yar:5,ed by the plane on the block is directed

  A block of mass M slides down a frictionless plane incll h;fxui bq.u:ak6zok-5 hh4ld3gi /5ined at an angle q with the horizontal. The gravitationbad u6q4iu z ;x kigl5ofl-:3/hkhh5. al force is directed

  Two toy cars (16 kg and 2.0 kg) are released simq arzv9 .aq81bultaneously on an inclined plane that.a az 8bq1v9qr makes an angle 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 forc1umz bhwqi 02)e is applied to the object, and0b2qwi 1uzhm ) 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 ta1athg.uv4h(wx5m 1 s o 27 m/s in 7.0 s. What is the average forward force (.st5mxh1 vaua 1hg4won the car?

  Starting from rest, a 4.0-kg body reaches avvl: ee cu3g24,rk xzes+blc(1f08vs speed of 8.0 m/s in 2.0 s. What is the net for1e+kbsg8uc3f xsvzl2v ce ,e:4lv0r(ce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50ks59+qso bt c,.0 m/s after tkc5 b9sq+sto, raveling
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 samex*dnzg5jn3m:)ph j.bql2 w; x force that you push a 10-kg mass from rest,hjb5jz2nx3.)q; :x*w mgl pdn

  What is the mass of ake d83 j6g+d()6vh/gtma avq t person who weighs 110 lb?

  What is the mass of an object that weighs 250 N f 1,0um; mauoyon the surface of the Earth where the aa mo ;10y,uumfcceleration due 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 obje 5lcl:c lv-ce,ct on the surface of the Moon where tc v:c5e,cl-l lhe acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 +gimi0q y:2ia N on the Moon. The Moon's gravity is one sixth of Earth's. Compare theiq2:a0y mg +ii masses of the objects.

  Sue and Sean are havingy.cu5tx*gza htk)0 a- a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if thy. aa-uh xczt5t g)*0ke rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surtq*1g b;i;ge2uiq spi / kvs48face. A force F acts on the stack, and it accelerate1 qk iu/ pgt eb2;8qii*vs4gs;s 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/q)y :yeu/v: amdjim3 N stands on a scale in an elevator. What will the scale be rea3a)// y yuemqdj :im:vding when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person islo65 amx(a mnu)qf gc:zai:l f6, ms;9 60.0 kg and the elevator accelerates downwa:z9ul)gxia sc6maqnaol(fm: f 6, 5m;rd 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 perpjekg7vjt*v:es 4)l 0son is 60.0 kg and the elevator accelerates upward w* jpgle v40v)e:k7 jstith 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 magnitude o58t uh1eo hxd5f 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acxhu 5th5od1e8celeration of the mass?

  An object of mass 6000 kg r. q ,ndeui/ .fprm6;a-bn w6eiests 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 tfde e-a6..,n pnwq 6b/uii ;rmraveling 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 zfsi mt7f/h, 8dy(o yr64uz o-kg 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 i, z y/874myoffd it s(rhu-z6of 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 = 0.40 kg, what q o4ny9,p1qam is the magnitude of the acceleration of anp9qmo,14qy the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if q,nsdo-jg dn52p :pv) M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction an5p,qdn j-n) spo:2gdvd the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal f e1 .krp5w*tfo8h9 9.upchuufloor with a force of 100 N cf* t kp h9ruh1puo.8fwue. 59in 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 hor+3-sqtdal-hr izontal floor with a force of 100 N in a direction of 37.0e above the q h3al-dst-r+horizontal. 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 we bxew/a:v7;ay sr 0c1eight 100 N is supported by two ropes as shown in Fig. 4-2. What ar /ba; eer7s1v0axwcy:e the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is -z mhv5zj: a snj tzr02ti/48kthe mass of the traffic lighthivt82am jjsrz:5 04 n/zzk -t?

  Two boxes of masses m and 2m are in contact with each other owtdr7 2-5lsdofaj z -+*9vovrn a frictionless surface. (See Fig. 4-3.) What is the-*fr5s ojldd zv-ta+ 7wvo2 9r acceleration of the more massive box?

  Two boxes of masses m :/g sabp9q,(xkel(bt and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net forc:, g9k( lxbap/(tqbes e on the more massive box?

  Two boxes of masses m and 2m are connecteqrjpa+jsc .qq (jh 3k-*cw:yvsr(7b ( d by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what kj3 arch7 (qjwj+rc:sy-vpq. * sb(q(is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) 4ci ro(r i cyfl+4(d. w2ujc4q If the forward force oruw( .i co(44 2jcyrc dif+ql4n the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected b, 9wip)zh7j p964o sz(rhzgtgy a cord running over a pulley as shown in Fig. 4-5. Boj z)6z 7ts,zhpw4og gp r(9i9hx 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 stu yuh7az:oj c1v*l99r :ojx;x *ztdj 0atic and kinetic frictions between 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 iso997x*0o: rj*z1ct zuv: yaxhld;juj applied to the box?

  The coefficients of static and kinetic frictions for plastic on w9z/eze 64.lw5b -nef q/jpm- 6agzy nzood are 0.50 and 0j- e ny9l.f6be64z/qpn mw/zag- 5zz e.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 direct aj;6hrkg(x:6k xyw, iion. It slows and comes to a stop with a constant acceleratio6rwikx6a( y,: ghk;xj n 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 h+8 d hgxmtyfs(s0 dd:t7k 41hvorizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retardsv (ytsmd10d +hf:4hs gdt7xk8 the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N azk 9l 5l ;;jmzri*5h7kj(lj rzccelerates 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 ins70x jnco+* welb ;w+witial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puccj;+wb x wl+e*s7nw0o k and the ice?

  During the investigation of a traffic accident, police find skid mun za/t*:hc1darks 90.0 m long. They determine 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 caruzadn *1t/ch : when the brakes were applied.

  Two boxes of masses m and 3mcqk4s+c t,qv wl: (3qx 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 rou4 x(csqw+3 vq:ltk,qcgh. 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 s vta0 4h+toh+,iuc)fw 51h1j)kjet eourface between the more massive box and the horizontal surface is smooth and the surface between the boxes is ro,5vae40hjt +) kw efu1o+ohtt) j1chiugh. 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 inclinm75 ex9x nter(ed at an angle of rn7ex59etm (x$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat higxn 9.ckx j bm;8d,gb7ll 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 smo;x0kgrf gn:2vzeu1l p zv1n18oth 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 smooc :j 6(ofn-aj)8knnzoth inclined 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 inclvf8 )m: uccev6ined plane, at a constant velocity of 6.0 m6c8)f v: umecv/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 downz1db q6)2uqn h1( tm/ abyc:un a 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 p.u+v mhrzc(ptur(j6rz(2b*a rre / 8 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 f9z 8k9ijo97scygmdyx5 o23 u4sf ax3 cable attached to the log makes an af3d9xkos4xf28sya 7gz3 c5omu yj9 i9 ngle 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 tif e*)aowh*gc/lted at an angle o ho*)*w /fcagef $33.5^{\circ}$ 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 graduallyli+(7 l rrh o3vv7qct1 increased unti17q(rh 3c+lr7ovit lvl 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?