Which of Newton's laws best explains why motorists should bucks6)5kc /kea lble-up?

  When you sit on a chair, the resu+ut t f98gu,i.4ndv 5yt2sk1d7zexh ultant force on you is

  In the absence of an external force, a moving objdrplru 4 63zg6ect will

  When the rocket engines on the starship NO-PAIk,yp;-gv.ua ;3ok q*rqyt8z3n;shhqp6*gui N-NO-GAIN are suddenly turned off, while traveling in e aruh6p*3;pu. hs v3 gktkn y8oy,q-q;zig;*q mpty space, the starship will

  A rocket moves through empty space in a straight line with constant spee y u+f;wset3 hd19nvs3d. It is far from the gravitational effect of any star or planet. Under these conditions, the force that musst du93 fe +s;3vwnh1yt be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing fors exrwa qi p(*/-v5(i+sptj/m ward, and you suddenly fall forward. You can imply from this that the bu+p*- swt/re5j /(xi vips mqa(s's

  You are standing in a moving bus, face5kali0 s -:mqing forward, and you suddenly fall forward as the bus comes to an immediat: se 0m-qlika5e stop. What force caused you to fall forward?

  A constant net force acts on an obj/b5iy lzp 9b2eect. Describe the motion of the object.

  The acceleration of an object*kdgio vrrgnw9ltx *h 66/y; / is inversely proportional to

  A net force F accelerates a mass m with an acceleratio;hs9ool rm 0ic2ue) ila;5il)c0f5te n a. If the same net force is applied to mass 2m, then the acceleration will b) esr)ltei;ch 5ou0 c a52olim if;l09e

  A net force F acts on a mass m and produces an accelerationy k4wmi3 .lhts/.geo 2iw33j t a. What acceleration results if a net force 2F acts on massl/.tko4wgyje3ws 3. imt3ih 2 4m?

  If you blow up a balloon, and then release it, b,ezjo./p (fithe balloon will fly away. This is an illustrati,. /( fobpjzieon of

  Two cars collide head-on. At every moment during the colli1 0v4o.db1f zar ks 6jw.4sleision, the magnitude of tw. bai 1 04 dfss46ol1evzkr.jhe 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 anq2sd85c- earf object, the force which the object exerts on you willr afqe8 -sc25d

  Action-reaction force3nv6k*qi fxjpl e. :f9s

  Action-reaction forces ared,l+j 7,fxebp

  A 20-ton truck collides with a 1500-lb car and caus/2vczixk3skmi1 0l 9kes a lot of damage to the car.x2kvk3k zmls 1i 0c9i/ Since 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 with)grz gb ri/v6e,6 oa9e force mg, which we will call the action force. What is the reactioni r6z6r vg9e)eag,o/b force?

  A child's toy is suspended from the ceiling by means of a string. The Eart6/rwq6z4f besh pulls downward on the toy with its weight force of 8.0 N. e/6qs4z r bwf6If this is the "action force," what is the "reaction force"?

  Your bat hits the ball 4myo g 8elc+-bpitched to you with a 1500-N instantaneous force. The ball hits the bat with an 4cbmle8 -y g+oinstantaneous force, whose magnitude is

State Newton's three lzlb 7/( ao0mlxaws.

  Mass and weight

  The acceleration due to gravitg,z57aogy 5u e*e1xp ( g.txony is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surfo5 g.( 1pgetn ,x*oxuzyae 57gace, compared to Earth?

  An example of a force which 2 l2vst,ve-jb(;pl ny acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a )8 ,ljv*:d5bsi0 qajpln6r y vofbm 1/person weighing 60nmqb,ari v:dl5s)pfvjlj1 b y/86*0o0 N?

  A stone is thrown straight up. A tuv;v dg48fp2qo4g;hc 7+:eepp c9tct the top of its path, the net force acting on o4 v;9gfp utc+p7p24c:vc tged;e h8qit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heightut7r2m3c md;w t*7apw . Ignore air resistance. Cptmc;3u aw2 t*rwd7m7ompare their accelerations.

  A brick and a feather fall to the earth at their respective terminais:4+tkb-)ermsh c2i l velocities. Which object experiences the greatesbs i4t+2r)ihekm -c: r force of air friction?

  An object of mass m is hanging a ,2 nd1zfkop, l 3r18wiytb4mby a string from the ceiling of an elevator. The elevator is moving up at cw84 da1 b3oyt z1fmlr2 np,,kionstant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the cel*pbwq l7: v59)li ppniling of an elevator. The elevator is moving upward, but slowing down. What is the tension in tqb59 pv)lli: l7 nwpp*he string?

  The force that keeps you from sliding on an icy sidewal(fohvpi. en6 ;y lx3a4k is

  It's more difficult to start moving a heavy8knzk;kppzifwmd 5*kf18y -+ 0k np(l carton from rest than it is to keep pushing it with1pk(pkmn 5 +kn-zfl*fkyd 8 80;zkip w constant velocity, because

  A horizontal force accelerates a f3sp pgr/th6 ;box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditi; rppf6/gtsh3ons 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 cons,l,iao:v (v,hhxgh 5ldp 81lhtant velocity. Thus we can deduce thahv5ado , 1vlxl ,gi(:, hphh8lt

  A block of mass M slides down a frictionless plane incli 5nl bth6ksrq:a2i v6a 4(tw0xned at an angle q with the horizontal. The normal reaction force e xq at2avr:54tn6i0 whlk6bs(xerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at 3,lt-4c vkrv:6u wr tnan angle q with the horizontal. The normal reaction force exerted by the plane on the bn,utt 3k6wcr-vl:r4v lock is directed

  A block of mass M slides down a frictionless plane inclined at an anmpqcsr)2yr)5 v 4 ,cqqgle q with the horizq2c 5rrsm 4,q) c)vpyqontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously 92pv9gnq7 v cson an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their agsn9 cqvvp9 72cceleration after being released.

  An object sits on a frictionless surface. A 16-N force is appliedrwwh6z/i;l5 0sz 1:jgio. 9d1ubp ped to the object, azdbu5 :wrwj 11/phlsed9. z6oi;p0gind 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 mz 8 tact:57ycw/s in 7.0 s. What is the average forward y: tt7a5cc w8zforce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What i h.f g79dpkjj )lor9m;s thej)o 7 km ;prjgfd.99hl net force acting on the body?

  An antitank weapon fires a 3.00-kg p j2 :+h.motmbrocket which acquires a speed of 50.0 m/s after trave: . bht+jmmop2ling
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 for0um )htgaxg0b 9 u++rdce that you push a 10-kg mass from rer) m+ag9x gh0ut0u b+dst,

  What is the mass of a person who we7qd)u e-n-uanighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface o10q;gcpkd*dz/j jyy e-./ afaf the Earth wher afz dp aj/g yk/q*dyj1.e;0-ce the acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of q b*r4d u7xmpjiim.)5: ;cacx60 kg on the Earth. What is the mass of the object on the :jiiq ba cd.4x*5)mr xu;pm7 csurface of 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 Moon. 84q 1ghw*lija,o mlva n8;dm :ob 9rq7 The Moon's gravity is one sixth of Earth: qamrwdamglv4,b* 1;l j9 hqi8 78ono's. Compare the masses of the objects.

  Sue and Sean are having 7+ektu)ov.5utgjn 0rmd8q 4y a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue put5+8eug 7k mun tjo0.d y)qrv4lls 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 frictips8z 34:yhgmf onless surface. A force F acts on the stackz 8gp:3 mhfs4y, 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 48qh 6hq(kp0brdw8pj ; 40 N stands on a scale in an elevator. What will the scale be reading when the elevator is accele;hb h0kprjd4q6qp( w8rating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an eh c m39z, xpx,fwoqqz:2-*qnflevator. If the mass of the person is 60.0 kg and the ele,nzh-qmqzcxp fw*,f3q o 2x9 :vator 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 th p8q70.b h 4u1w)tnyqu ey9*wzp)lrxne mass of the person is 60.0 kg and the elevx nyun4thupq*8l9yw0 1we).)qp 7bz rator 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 mass. Onen/mf jz1/g/u kj ;3s5di/ow r y/xll6q 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 accelerafy/ /q rl5/3gj/mkjlo 6nsw / di1xzu;tion of the mass?

  An object of mass 6000 kg rests on the flatbed ofx; e w9mg+)d nl06+b2w elqwxh a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000;0h 2+delxn+6bwxqwe wm )lg9 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 truc -7j0qrw-9arvp -y7p swqiom*k. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the trucqr07vw-iqwp-yra*p o m 9 s7j-k 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 shown in Fig. 4-1, if M = e 6l) . ;yzhv7;vajdlt0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction a v; 7lvtla)z6e;. hjdynd the mass of the pulley.)

  In the Atwood machine shown i tc.ik2og5 k:urx r,0rn Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ix:r50ir 2, ko uck.gtrgnore friction and the mass of the pulley.)

  A student pulls a box of books+-il p p,un:lcn-* v a/lmm+lc3t7jwl on a smooth horizontal floor with a force of 100 N alctm*up7 l+jn+3cvn:l,l w -p im/-lin 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 l-jcxr zh +4m;smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If t4ljhz - x;mcr+he mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weqc6y sl62cypp u s :/ob,s gk)9dnz;1right 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ssyp2: rug;bn o/ sp6ck1 zqc9, )yl6dropes?

  In Fig. 4-2, if the tensions in ty17xp-c be 2oqhe ropes are 50 N, what is the mass of the traffic light?oc e7q2-xyp b1

  Two boxes of masses m and 2m are in contact witj 6r*n)o woc+2ben: jd:g6 h5x-ydxu hh each other on a frictionless surface. (See Fig. 4-3.) What is the accel gu)hedn ox6 c5:-ybjon +whjxd:26*reration of the more massive box?

  Two boxes of masses m and 2m are in contact with each othervx/ik , +nq,sp on a frictionless surface. (See Fig. 4-3., +xk /,vsinqp) 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 jqk3f hdj sewz 0f0 kz3 ltv-9s+/p-c.the forward force on +0flzh3 e3k0.-szdp k9cjtqswvjf -/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. (See Fig. 4-z(dmnqxqv0/ ) :gbe f*4.) If the forward forcg/0n dm) zbx(eq*v:q fe 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 shown in Fig. 4-5:t:johpc/4jvo vs- *s . Box I ofs4/ stjjvoc : h*o-pv: 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 b2q l v.d6/4pb71m x(od ,3raliecebzsetween a 3.0-kg box and a desk are 0.40 and 0.30, respectiv l dbdlrb eocv6x7e,/ iqp2143 z(a.smely. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictiogvy 51o9:s:n oy+ta xqns for plastic on wood are 0.50 and 0v o::g yta +ysox9n15q.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 and comes pm. rxk82a-/jh.qnc oo3 n tt;to a stop with a constant acceleration opn.-o2 m.tro 8n/h ck t;q3ajxf -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal szgnq xw39cwk4p 49 -kdurface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the obq wwg949nz4k-3 cp dkxject?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, avwboakiug;8z;(l j;ty-u (kypu g5.) t 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 speed of .k; pp:d yhzs 3qfdyh+x6.r b310 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction3hf k:by3. qpz d. xr;shdpy+6 between the puck and the ice?

  During the investigation of a traffic accident, police to4vsu 5 quy),jv3 fk+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 conditiu5+ qvk)foy,4jt3v usons. 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 sr7i -f i(83go htpssigi/ .)qiurface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box d3i( s fhgi )rq /t-.8soipgii7oes 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.) Theklq gu9* w,cz qh902x :zzuq9u surface between the c9: wuuuq*0,hqk9 lz gxz2qz9 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 is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inn+0lgqxx ;bqybco3;/ 7b yt7uclined at an angle o7t;olqb0n7;gbc+ xb3x/uy qyf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a f-vi8kh ,czvr( 4g1 egxme;yg:lat 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 an anglg agn;,+cwo9x(ouo t( e 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 plannfm e; w(c3b p+zu-7 h/*bwvuue 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 consa0t 31en 3ewtrm7 p98z wf9blhtant velocity of 6.0 m/s.he e1t tzw 389w7la3mp90 nfrb
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 rouopot2 y f11q pq-a;f* nue7g,sgh $37^{\circ}$ 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 6 nepy+sj8* ghdown 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 cabm gwe/ifs+5za6k0jm + le attached to the log makes 0/amk56 mgj swi++efz 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 fr.c.ds g cq+d/oom rest on a rough inclined plane tilted at an angle dg+ /ccqo. d.sof $33.5^{\circ}$ 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 ao p qmd(us(:u78k sl-z /2ehdcngle of incline is gradually increased until the object begins to slus/: qz7dusdo h(c 2(mkep-l8ide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?