Which of Newton's laws best explains why motorisbcu3i(b-b 3lq ts should buckle-up?

  When you sit on a chair, the resultant force on x3zfs1pb+stj e 6 2u,yyou is

  In the absence of an external force, a moving obj-6,mmipynxpe4gh 3 e )ect will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned+,x i*5my*1u9d w wecgsu3anu off, while traveling i* 1n cdxem,gu+*53uwa 9iswyun empty space, the starship will

  A rocket moves through empty space in a straight line with c/r2ohti )la8 tonstant speed. It is far from the gravitational effect of any star or planet aott/)8il2rh. 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 you sudde:+idt .5x.tq hh bfqmy9e.id ahzms s .:+4y-rnly fall forward. You can imply from this that the buyqmrtz eq+h. xssbm : hiy.i5t .dh+4.d f9-a:s's

  You are standing in a moving bus, facing forward, afzw)(u xx53kxnd you suddenly fall forward as the bus comes to an immediate stop. What force cfwx(z5 )3xuxkaused you to fall forward?

  A constant net force acts c/f2/x0bcqy7 ojz s.h9st4v eon an object. Describe the motion of the object.

  The acceleration of an object is inversely pr.lgj2 ayn dj2jc uds+(w ,+6aqoportional to

  A net force F accelerates a mass m with an acceleration a. If the samvu l(b 2/9dyt dr3q eism0049 q1lclale net force is applsuaq trb d4c2ld3(yi0e /0 lm9v9 qll1ied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produc dyo,:ty:/ar res an acceleration a. What acceleration : /dya o,tyrr:results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the :u*t7 wtymwigi*. ((wavu m,rballoon will fly away. This is an um ug7awiv *t ,t.y w*mr((:iwillustration of

  Two cars collide head-on. At every moment during thc) c1/ )hy:w-zyzdk3e2g6ru.xmbojfe collision, the magnitude of the force th xbhwozcgjduy z2)m-6.e 3/ ky1rf):ce 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 forc:fj*5v o14rj 4wokrrv e which the object exerts on you wil5 f4krrvo14jv: *r jowl

  Action-reaction force biyju0su.v,u /f:b 1qs

  Action-reaction forces -2o6o2ve0nqzz*ere w0:vh /j ukz0 n fare

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the )0qb3 9jed7f2q xuqk igvs3/ 7gt0 ogfcar. Sitb dgeq f7 q9i 0gjq 3230s7xku)/vgofnce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object w5.01u ni8j ho8fsrzvs ith force mg, which we will call the action force. What is thevjsi85fh .8 onr us10z reaction force?

  A child's toy is suspended from the ceils i. - w fwbb(qcmrpywjlw:f:)oq(-xxx--).ping 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 "reac x:p- r-. -q:)fm posy. wx)xlcibww b(wf(qj-tion force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. The x2rks*s tubt7,x;1nb(+ 7svko w 3i jwup +xo:ball hits the bat with an vow 7 obn;: +i7 kju,(x*s x3wptkusrxts 1+b2instantaneous force, whose magnitude is

State Newton's three lawk:oxq x4c)l3. st9cu ds.

  Mass and weight

  The acceleration due to gravity is lower 3dj oy gq-/ave/3ux7 bon the Moon than on Earth. Which of the following a x3ydb uo-j/g qev7/3is 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 distamrqf lw3l9yw,+nxn k .;t,ur; nce is

  Who has a greater weight to mass ratio, a person wuii (ir*l 9l5y.kb o;09a ,xqr;qtj rh fv9,kneighing 400 N or a person weighi(ikk; 9.q09ta f,nlr *9ri oy;,ub qr xihj5lvng 600 N?

  A stone is thrown st3:s avi,s;; eyopga xlgson,9ava/09 raight up. At the top of its path, the net force acting on it isaovaia olng;s; ,/yx9 93gv,a0:se ps

  A 20-N weight and a 5.0-N weight are dropped simultaneousl +6g1d6f7(i 4q-cc28yzmlr db elgzeu y from the same height. Ignore air resistance. Compare their accelerations.cdeib1f27d6emzlz(l4 +cy6g guq8-r

  A brick and a feather fall to the earth at their respective terminal velocitie;0+okgvr1bh q7t; byos. Which object experiences the greater force of air f0 1; ;bt7qorhb ogyk+vriction?

  An object of mass m is hanging by a string from the ceiling of y:ngoz(mc (6*y ndtk. an elevator. The elevator is moving upcz(6k*t n d ymn.ogy(: at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceil v:2-/t1nm psztzqesl kekxb c:*a;96qd y)r)ing of an elevator. The elevator is moving upward, but slowing down. What is the tension in t/z9 *ma)y) lq e2bs:ecd-v :6;kpxtkzs1nq trhe string?

  The force that keeps you from ;xgk3(n aq 8iesliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rey +y+o3gc nlk0+qaq2m st than it is to keep pushing it with constantyqk2cm oq0 +a3+ylg+ n velocity, because

  A horizontal force accel(jyehamxgh( 7ub*t 13erates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, a7g(b 3e j*1hmyaxu(t hnd 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. Thus we canv a1vt ,cqp8f 3y+hd7o deduc p dqo,vyf3atcv8 h+71e that

  A block of mass M slides down a fr+go6;c)pa suldd wigp;0px7 7ictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on t6 cdwp dl+g ;pix g70a)u;spo7he block is

  A block of mass M slides down a frictionless plane inclined at ;wb2ft9 )t)d wkdw7fo-pm. csan angle q with the horizontal. The normal reaction force exerted by the plane on the bl9-tfwf7 ; c).p wsdm)bd2tokw ock is directed

  A block of mass M slides down a frictionless plane inclined at an angle q with t: *xe jw,q1 ,miczf:ckla ,8pthe horizontal. The gravita,w ,l xj qeik:fc,t:cpam z1*8tional force is directed

  Two toy cars (16 kg s86bk370rd dzb bbx:uh2 rl4nand 2.0 kg) are released simultaneously on an inclined plane that makes an angz 4d rur bhsk:l3b8bb70 xn6d2le of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surgd84hhekqpy or a7hl*4 a4p5-face. A 16-N force is applied to the object, and it acc 47do p5hh-4pea*y8a l 4kgqrhelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelergn 2((jn ckr9 m9z;dg7 irerb(ate from rest to 27 m/s in 7.0 s. What is the averager(gnzm2gnr;9(ij br7e cd (k 9 forward force on the car?

  Starting from rest, a 4.0-kg body reaches a spjxvbq+ rw.y;7l( -v x, xalu.deed of 8.0 m/s in 2.0 s. What is luv.j,; xvylr+ax w.b(7qdx-the net force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires of deuv 6/hf7+a speed of 50.0 m/s after traf/ +uovhd 6fe7veling
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-ks2 ox de64isch+s bg-3g mass from rest,h3x d2s oe-gs+s 64bci

  What is the mass of a person who weigh3ih)t;jaz3 xqs 110 lb?

  What is the mass of an object that wefo(uwst tw:) 8sm)d t;ighs 250 N on the surface of the Earth where the acceleration due to :;tots(mfs8)wd uw t)gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of-krfujicl4 (tgx 7v*ms6j)j 2 the object on the surface gju*- 2tjf rmx4ksl 7)ij(v 6cof the Moon where the 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 N on the Moo 6hfdkaw t+(8wygyud9 7o1u 0bn. The Moon's gravity is one sixth of Earth's. Coy0f+ k6t8( 7 duobg9hwayu 1wdmpare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppokc:ytgn +-w.o01 * yuu3z hwzdsite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's forc3u:0c w.h*ny z+ 1yu-gwdtzk oe if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books resy-+wl)/m8h r xyb2a kjts on a level frictionless surface. A force F acts on the stack, and it acceleryr+h jw -b8/lk)ya xm2ates 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 elevator. What will the scf4bhfa*k,yatl d v tck53 : 6yen*.vn.ale 5btyf3 vd v.e kk.chy*lt *f:,4nana6be reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator.fp/ lw*frz+8q:/oqf du.:dhh If the mass of the person is 60.0 kg and the elev/.:f q/h w *+8pzlf rqdfu:hodator accelerates 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 r-5nab lhzu1 8mass of the person is 60.0 kg and the elevator acceru5b-8l 1ah znlerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on aq.fjm q)/ p urh4;pg g8;.s9gx/zfrhi 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force towgm g9//f.4qr;)zrsp8p ;gih. jqhxufard 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 hel4 80yulwhg2 f 4ozq0dkd 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 not to slide forward into the ca0og8k yldf0qz4w2 4 uhb?

  An object of mass 6000 kg rests on the flatbed of a truck. It is h(t0gxvyg h1v/3r1i r aeld in place by metal brackets that can exert a maximum horizontal force of 9000 N.3vi 1a tggyr1(/0xv rh When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine sn7xas polhaml3i2)5 s;ri01j/ uk2cn hown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fricto12c3xnj l h a 52ski7is)nm0 lupr/a;ion and the mass of the pulley.)

  In the Atwood machine shown in Fig. br:sa,z0*dffn ;efp + 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignoenp0ff*s+,a; drfz b: re friction and the mass of the pulley.)

  A student pulls a box of books on a smoo5 ecvvv ,u:g1zj 0zky56 +rtlkth horizontal floor with a force of 100 N in ac1+vlyz:, gev5vkt z k5j6r u0 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 bir/o oo* jl6os8x/v9uooks on a smooth horizontal 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 norml j*/xo8s rvo/u9o6ioal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2. 8dhx (1q a2mnnha)h g,c6hzg( What are g6a8znah,m 2hnh ()q1hdxc(g the tensions in the ropes?

  In Fig. 4-2, if the tension/48 4wgiid) t vgvc2.uw lzgz7s in the ropes are 50 N, what is the mass of the traffic ligv .zg2 4izglw8 7w/ctgiud)v4 ht?

  Two boxes of masses m and 2m are in contact with each other on a fx4+n v. 9jg-lfdr qni8dohor, )5hx kde580ajrictionless surface. (See Fig. 4-3.) What is the acceleration of the more massiv,0dg5d orf + x-)8ordnhnliv4 8.x5qh9kja je e box?

  Two boxes of masses m and 2m are in cont jy(ay-it2j/yhnam 0 2act with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive j 20yajy-(ih t/ 2ymnabox?

  Two boxes of masses m av+a)x9 ): ;3 pp9xrl l(l2mpylpinnuvnd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on thepuv lrxavn)l99pplmpy2: n i )+l3 ;(x 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. (S/ le)j pzr;n7jee Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration or;jezn7 j/ pl)f the less massive box?

Two boxes are connected by a cord running over a pul9:1uoolk (j+1,s t7wy ae am.hv 7yqbgley as shown in Fig. 4-5. Box kjt: o,el7v97 m1q . b+awyh asuy1go(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 k)19;f qcg p ,w l/ovpdjm +.w7ht4ywxand 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 horizohdwpw p7 ;1 mjv/+cykq).4gtx 9,woflntal force is applied to the box?

  The coefficients of static and kine- 4rh:oorxujb60hxqx ng*1.ktic frictions for plastic on wood are 0.50 and 0.:uhr 610obnxohg-q r *xj4.xk40,
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 direction1is,-gyx x7y g. It slows and comes to a stop with ixg1ys7 gx-y,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 horizontal surface is pulled by a 5vfzv x qf*wu0g9jl;3+.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the ob;g0lv fzq*u3xw 9v+f jject?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a yq+l8p pz6.82xh orw8hz0x+uv e;y wg 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 mgr :- aar:8/ftoi0 egf/s. It slides 50 m on the ice before it stops. What is taa/g8 -rf: t0iero:gfhe coefficient of kinetic friction between the puck and the ice?

  During the investigationm6 hu ky,q:ra a3/:euy of a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadwayh3::uq a/r yuk6yem,a to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and4sec+ x7u5m5v24 qwvl;id zbh 3m 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 thbq s4i4d2c uw5+ zxmv5e;hv7le more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are 8ivz; bo2z/.ux 7kuvjstacked. (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 box, what; jiv . zkxu/v27ubz8o is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined planeyl7)hs r pb:cgahn(.teim0 77. The plane is inclined at an angle oet70n)hcsl7h .imgp :a 7(r ybf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down. z*.jjt youa kbxgj;d-4 a5b: a 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 withc;qsvqpf5. ilnn/ l13699hs:br tlb j 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 at anxbr4gtymwnpl b2u5g9 ri81 62 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 dire)o8q7v ibq/ bbctly down an inclined plane, at a constant velocity of 6.0 m/sbq8/bbio q7)v.
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 rough +w4pke 1ct;x/jmzve- $37^{\circ}$ 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:s;ugw( *r i-apw m7va 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 weighi nks)ofa8s( (z+ ej4 7vyv)tgn*0 gynpng 500 N along a rough surface. The cable attached to the log makes an angle of 8+n7pnvn*0 zgeyj v)y (4t) s gokafs($30.0^{\circ}$ 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 in:zw 9n ropf84rclined plane tilted at an anglewznf:rr4o 8 p9 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 an inclined plane. The angle of incline is gradually i xnye44 */0k;fv:sxauruu)wa ncreased until the object begins to xkex )s fr4:0;a4n*vaw/ uuuyslide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?