Which of Newton's laws best eb3aw ue fv)d:7c0.bwlxplains why motorists should buckle-up?

  When you sit on a chair, the resu4hx 8 .klzbhj2/ l) 0j;hzijmcltant force on you is

  In the absence of an extern sloe. uj)r-.ecy3fl. al force, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN vk2z+qv/n9 ke are suddenly turned off, while traveling in emptyvqek9k / +2vnz space, the starship will

  A rocket moves through empty space in a straight line with constan n06a da::+ jc*keeuwnt speed. It is far from the gravitational effect of any star or 0na w6kj :anc*:e d+euplanet. 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 forward, and 6g b7+u 6w7 ishi2v8yu 8yhanyyou suddenly fall forward. You can imply from this thas6vi8y2 b g6n 7uuw+a7yhy8h it the bus's

  You are standing in a moving m6)+n)vmo jj;nd *.*rmfbxnqk 0a bg 7bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stopadrgnx bjmnkjq.o* +)n*m6v;)f m7 b0. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the ooki9ez:md myj1tj1 mk (.c9.abject.

  The acceleration of an object is inversely proporx kzf)r nu/r5oz9 4rw6tional to

  A net force F accelerat*,fiql os2zk:+d; pvz es a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accelerq+sv *ozlikz:;2f ,dpation will be

  A net force F acts on a mass m and pr4z :g9: jcgzfpfvtc39oduces an acceleration a. What acceleration results if a net force 2F acts on mass9f p zct3g9vj: fg4z:c 4m?

  If you blow up a balloon, and then release it, the balloon willri2e89qsmj ;ry1p w a/ fly away. This is an illustration9;e2y a1rjw sipr8/m q of

  Two cars collide head-on. At every moment during the collision, the magnitude o b-j8jtd8 brm9f the 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 r8 btj9dbj 8m-an example of

  If you exert a force F on an object, the force which the object exerts ono8f: 3 l*lopwy you wily:*wf 3pol o8ll

  Action-reaction forc + ry*-m/xj s/sbfaiw8es

  Action-reaction forcxduwsl7-2+kfthx/m, es are

  A 20-ton truck collides with a 1500-lb car and cau k24: 7qwfzdlws/7xsy ses a lot of damage to the car. Since a lotq2f sz74 k:w/ls xyd7w of damage is done on the car

  An object of mass m sits8:vo1ht1e fo95ikr dh on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force? hohfrdk18 9v:tio51e

  A child's toy is suspended from the c 8/cg;eq2a a. m dwgco7qboh70eiling by 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 "reaction forc acqb g / 7h82d.oaeq7wcog0;me"?

  Your bat hits the ball pitched to you with a 150(rne0 ydgiu ;1a-1gmg0-N instantaneous force. The ball hits the bat with an instantaneous fgeuy;ardmg1g 1ni( - 0orce, whose magnitude is

State Newton's three laws. 9m(np( h :w1cbdvcsk; 2pg8ro

  Mass and weight

  The acceleration due to gravity is lowerdhx ;ore4-nakpv)f70 on the Moon than on Earth. Which of the following is true about the mass and weight of nvop;ka7 xhre0)f- 4d an astronaut on the Moon's surface, compared to Earth?

  An example of a force w+: *0 rq e pz0j/vs, qqvd(lhtqrag;t+hich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig hv2vnll80k q97mzs o6hing 600 N? 2m h8skl0z6l o7n9vvq

  A stone is thrown straight z;ef:mvqd /+l up. At the top of its path, the net force acting on it/mdqzlve; :f + is

  A 20-N weight and a 5.0-N weight argtc3p+ fd 6 6ecud- z1iu510i7 icvksde dropped simultaneously from the same height. Ignore air resistance. Compare their accele1 31cps+ 6-i76kzedfic ddgvt0cui 5urations.

  A brick and a feather fall to the earth at their respectinh *m91of9(z koxc1jpve terminal velocities. Which o n9mofc z(x9ph1kjo1 *bject experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceilin 3r7n:vil lg(w4org.m g of an elevator. The elevator is moving up at c.i:wglr 3g 4nrol( vm7onstant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an elevator. )1us 0dt-k 5mypdrmb + The elevator is moving upward, but sl k0bm1-psty)dr+ 5mudowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewall wa5 i3+nu..zmq1s ymk is

  It's more difficult to start moving a heavy carton from rejwyn3-m3 f z+iqrch6 d8omy) /st than it is to keep pushing it with constant velocityn3 hrod6j c3wmmzy+q-i/ )8fy, because

  A horizontal force accelerates a box from rest across a horn0vj 535m wlru;i 3jdn;jme e*izontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal 3nm 0e5vjjew;ljum5*i r3 n;d force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thzx lj2g8q5(eunhn ubv g ),a5(us we can den,a)((5u 8q ngvelzx 52ugbj hduce that

  A block of mass M slides down a frictionless plane inclined at ayvgk b a9n, ,4hg6m eq:a6-ovan angle q with the horizon-nq 4 haeoav6kv:9y6gb,,gma tal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides dh +hyv j075dcvz k nu.cfcte /b)4i/b+own a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerct/70nh zdv+ hc+y )k.bj/v5ebi u4cf ted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with tiq6 p oxr02hj z;0m6i n/xan1/qyuuw;he horizontal. The gravitatioqj/;y wu1qi/inunrx a06xmz06p 2h;onal force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an incj 8t:prw(+k;j7 hf)l(ssite ulined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being releal(is )hs;j+f:et trk jp8w (u7sed.

  An object sits on a frictionless surface. tj yb ,h v(s)4fmo;pja +x+.o88pdswg A 16-N force is applied to the object,fj8 , hoavxb.8mg+ ;swyjd)ts+p(op 4 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 sr8mb2c6+c1n r*zscto . What is the average forward omnccrbs z68r2+ct 1*force on the car?

  Starting from rest, a 4.0-kg body rtsz0s kltzjz7 f+(g-9 eaches a speed of 8.0 m/s in 2.0 s. What is the net force acting z0 -9zs zgt(j+tlsf7kon the body?

  An antitank weapon fires a 3.00-kg roc,hx/vsnl 65 woket which acquires a speed of 50.0 m/s after tr6vxl /hsn, o5waveling
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-kgad.t/ 2rbh d7k mass with the same force that you push a 10-kg mass from rest,a7 t2dr.bdkh/

  What is the mass of a person who weighs 110 lbj hdal,lfxv9,z m.8s*?

  What is the mass of an object that weighs 250 N on the c/ i* jd )qvbm)svyegsz 59,dmb0vf95surface of the Earth where the acceleration due5/ zc*q509vdmsb gv ,9dsm yb ))fvjie to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is t3.o m tvw;.se;m6mciya; k4 gyhe mass of the object on the surface of the Moon where the acc;e64osvkgt wm3y; im..ay c; meleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N owlji8c, i(r,mpd5s vv, 2nj 6tn Earth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses o j8wvi56(,it n djc lm,2r,psvf the objects.

  Sue and Sean are having a tugr14 fqc 1-mvn-p5:cv x( n-g dmrd1tfb-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 the rope accelemtvqnc r(-1-4m51n frx: b 1vgdd- cfprates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A fot ahpzn;t.2c+ rce F acts on the stack, and it accelerates atahntz. 2 ;tpc+ $3.0 \; m/s^2$. 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 elevator. What will;/4rg *s7ti yy2yg fjomj99yf the scale be reading when the eleva 2j og*;y9yyyt9 mfj/4r 7ifsgtor is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person z;n dxmofn;tfif4mwe+0 c b+9tc-w71 is 60.0 kg and the1x;o c-+w0m7 f w nm dfn4efttz;ib+9c elevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridevk;r:q mv-i4 pr +es8as in an elevator. If the mass of the person is 60.0 kg and the elevator acceleratisemr4r vvp+ : 8-kaq;es 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. On-hcbcfj4 y w;:u1r2oq /wjxv.e force has a magnitude of 8.0 N and is directe12cor y/b h cjvww.;f4qu :xj-d due north. The second force toward 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 aq 4 n1r+cnid5b truck. It is held in place by metal brackets thaq4in 5d+c r1nbt 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 of6b4 xu bncci:) 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, n)6bb:xcic u4 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.rf)w) 6b-dknh 60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the syste -k))6bnfhrdw m? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and q h8x/zge8 lb kyy 1a7ydfoc:v*:4ic.m = 0.40 kg, what is the tension in the strkhv yay8x/ib 7lzd8*. qf:og1 ycc :e4ing? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a sg8 x 31q1hwva rdf0ce1mooth horizontal floor with a force of 100 N inhx3gc 0 1 a8rfvw1d1eq 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 force of 1t/li1 q nk;*ry00 N in a direction of 37.0e above the horizont1ytn/qkl; i*ral. 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 gd k;+93 f:c3,vibqqiojpa u5supported by two ropes as shown in Fig. 4-2. What are the tk qfa+5 g3:pui;od, jibv 3q9censions in the ropes?

  In Fig. 4-2, if the tensi/lrh)m5j a:f dw u z8f,kmze1+ons in the ropes are 50 N, what is the mass of the traffic light?m f+/:l ze mwr,d5j)z8fh1uka

  Two boxes of masses m and 2m are in contact with each other on s;+nxy z7bvu1i c9d+/ads0fm a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more m1v+d/zc9i; yfuxsdsn 7 0 +mabassive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionw4h 1mdb:j)rs less surfahm)s4j bd1w:rce. (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 fjw7na tx8m(/ y:u1u qFig. 4-4.) If the forwardmawj yf 7t81:xunq u(/ force on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See4ub*la0tk6xz )zpenze)cdf4i)9v +e Fig. 4-4.) If the forwardbef4e)l)czz9 vi0xd tu*p6a 4 n+e)zk force on the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cordhg8-w osvq3h1 running over a pulley as shown in Fig. 4-5. Bo g3s-hw o1hvq8x 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 ki1bkf83 ugyq/ enetic 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 /gu13fy keqb8 horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 02r1emal1vxken: 6e+3f8z i zog+e )vt.50 andi 8+r+zz)oe n a16fektx:3evv21lgem 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 slows ahy sp9,8/:1rbf dhpl knd comes to a stop with a constant acceleration of - p,hpr9k : sbd/hyf8l1$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is :wgtdp-q jx,;pulled by a 5.0-N force. A 3.0-N friction force retards the motion. W dgj,w:px q-;that is the acceleration of the object?

  A horizontal force of 5.0 N accelerates pud2wkvxf-b (5g 7p5 qa 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 puc f(nv6dq+x7 oqk is given an initial speed of 10 m/s. It slides 50 m on the ice b6x dq(noq+v 7fefore it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffi zek/ 8dkmzhh6rp:9k6c accident, police find skid marks 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 8: zz9pkh dh6 kmekr/6car when the brakes were applied.

  Two boxes of masses m and 36 8jtq, ytsvttm.jmx;a6gh5 3 m 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 box does not slide on the more massive j6;3mtqhg. vy6jtt8tm5sx, a box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. h 7 74xx:fmqef(See Fig. 4-6.) The surface between the more massive box and t :fxqmh4e xf77he 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 frictionlesst 62gz2 k/nwa hv0vdc:yf+fm/man5 n/ inclined plane. The plane is inclined at an angl+g wn thm2d/n fcman:z 0/ k/y6f2vva5e of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a8 s(; ngfoj.a 8cun9ss 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 a smooth inclined plane tmbe .:dklwf)0z lc 25with 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 in 00fguwm6ocv :clined 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, i 2,l5c+msga 3ouvb -wh*n7pe at a constant velocity of o v*,s3plmghc -2 e w+n7ubai56.0 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 dowjt w7b u)c;-nxn 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 snelthpzi,s *9+ p;u1a lides 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 weighing 5 ugqf8* 2qv:ss00 N along a rough surface. The cable attached to the log makes a8s *sgf:q2uv qn 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 rom8msd6xxyc75 ugh inclined plane tilted at an angle8x cmmx5yd6s 7 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 4((w9hu i:pl h/ukkbw;t jnx6 an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is th /wbikx4:w nu h9 (ptj6;hulk(e coefficient of static friction between the object and the plane?