Which of Newton's laws best explains why motorispufw+py t52hr urv1/g,u+a *nts should buckle-up?

  When you sit on a chlg+wx2ebqus hu g1 82i-)tnn7air, the resultant force on you is

  In the absence of an external force, a moving - scaab 8h3;6z ahth9uobject will

  When the rocket engines on the starship NO-PAIzu/ o4k.l p 0 nki,3st xixn9x4md4vl)N-NO-GAIN are suddenly turned off, while trav. kvt, pmioi4xn zx30l )xkns4u9/d4 leling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant spd /w t c(d no.5wd*rkb8fmj68weed. 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 mo6n w8rd/ t*j(o wc.dwdkfm8b5tion is

  You are standing in a moving bus, facing forward, and you suddenly fall forwb1h69f ga,/jp c-tsztj.)ei fard. You can imply from this)9spatbef-h,jgj t16z/ i f .c that the bus's

  You are standing in a moving b 7cn*xp3pz7m*znw7sous, facing forward, and you suddenly fall forward as the bus comes t z*wopmpx7 snzn*7 c37o an immediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of tq/3 mfx dat/w,he object.

  The acceleration of an object is inversely proportioudbngt3 v,)pi90nsq 7 nal to

  A net force F accelerates a mass m wicv0p8; g s+ipjth an acceleration a. If the same net force is applied to mass 2m, then tv+;p cj8g0pi she acceleration will be

  A net force F acts on a mass m anwdm,1(. iybn -yr g7qkd produces an acceleration a. What acceleration results i1k(- y7mynd bri.w, gqf a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon i1sio,ysmbcg :3;sb+will fly away. This i, b+ 3:mgboi1 is;cysss an illustration of

  Two cars collide head-on. At 2bd.r4i3gpv,rxa9b ,ted ;ml every moment during the collision, the magnitude of 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 an example, ,d 43b;2 . imgrrlaxv9dbtpe of

  If you exert a force F on an object, the force which the objec,v0wgi4n x9)jr b/zqdt exerts on you wilr)nzv ji0 q ,dgb4x9w/l

  Action-reaction forcez+gyy8 qhv)n6m ak8 8ss

  Action-reaction forces areqsbzo 38 j+0ri5q7) tx bf8wajbh 4l(y

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to thex wre* 0k)uo ,pjy+g.b car. Since a lot of,pr0+u e. )jwbkg x*oy damage is done on the car

  An object of mass m sits on a flat table. The Earth pul32 1unwm5j2 yybo1w.w eei*ec ls on this object with force mg, which we will cal2yee5w u1b3*w2j 1enm o.y iwcl the action force. What is the reaction force?

  A child's toy is suspen nyu4748 shq5xlg3hlxded from the ceiling 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 "rea44lxxq yg583lh hsnu7ction force"?

  Your bat hits the ball pitched to you with a 1500-N insw- u:ymqn(-u2if8 zqg tantaneous force. The ball hits the bat with an instantaneous force, whose magyu 8qw(qz f-ni-u2mg:nitude is

State Newton's threeip*k y.v*yxmpd 8t8g o6(r3 sm3hfk9 c laws.

  Mass and weight

  The acceleration due to grav;scj +/qeag7 aity is lower on the Moon than on Earth. Which of the following is true about the;qje a7 a/c+gs mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at ;d i fl 6o/3nats0n(,r)byjid a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N oquka-v:*hy va0i as*s 8:cev u --7scar a person weighing 7v as:-aa*uh*ca - -0eus8qci kyvsv: 600 N?

  A stone is thrown straight up. At the top of its s+freskxx5 su6k95 s0- mgya :path, the net force acting on it kxy s s5u6ma-k0f5s9+eg :xrsis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same hm eo-,/ w vfoos7 a-:w)81ux 7wpmolekeight. Ignore air resistance. Compare their accelerat-)7k,u8-vo:/ 71lfpooeomawms wwexions.

  A brick and a feather fall te + 9,qxr5ihcpo the earth at their respective terminal velocities. Which object experiences the greater force of airh59peq+xir, c friction?

  An object of mass m is+equxoh; /w1x -b(f v/p gjj0z hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the stringeoxj1h;f b(zp j-g0x+ v wq//u?

  An object of mass m is hanging by a string from the ceiling of an elevator. Th gs 8e v5r9.njxz)o;jbe elevator is moving upward, but slowi;nv bsoe)g5 xjz9r8 .jng down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewawju(ck o(qv ra :k(8rn1p,4pjlk is

  It's more difficult to start moving a heavy carton *u3a)xlug ,lqfrom rest than it is to keep pushing it with constant velocity, becqa3 l)uxu,lg*ause

  A horizontal force accelerates a+fl-l4-wnt 3 hw clwk -1g5gsr box from rest across a horizontal surface (friction is1l+-ncg w-lr-ww fk 53t4glhs 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 happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant veloc )umq cb/7;r/ ybeh )j+8j*qwlq8ft uz;l iqv8ity. Thus we can dedu/hjib+lu 8; eu/lwjb r 7 *;v)mz8fy8q)tq qcqce that

  A block of mass M slides down a fric nxq(jp2z)c;00 ui v,obf,smqtionless plane inclined at an angle q with the horizonso z,)q,q2;u(mnpv0j cb 0 xiftal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a *s0d.r q2t7ilvr sf7i es0 9z7y.nuzbfrictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted fsti70 be 0rilvynzz uq7s s.9 rd.27*by the plane on the block is directed

  A block of mass M slides down a frictionlesj+a nx9,egp yg wv8m2;1srec ;s plane inclined at an angle q with the horizontal. The gravitational force iggj;1 9ps wax+yrvce ,nm28 ;es directed

  Two toy cars (16 kg and 2.0 kg) are released s0w yx5j3akvz.n13z ovimultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being releax5o3zwnjv1v ky3z. 0ased.

  An object sits on a frictionless surface. A 16-N force is applied togc om*w vg90in5us0cz8 0teb + the object, aic0n0u 5*v9ogtgb szm +ew 0c8nd 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 rob.nbroo : p 2ouvd,v:7,y2s xest to 27 m/s in 7.0 s. What is the average forward force on the bnvybp. x roo:s,d2o2,:uv7ocar?

  Starting from rest, a 4.;fw5tkros ,w v8k9r0da w2zg ,0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the nwv9rt;sz0285gk w , rkoa,w dfet force acting on the body?

  An antitank weapon fires a 6l* 3qmsb7 9tpgzzu3j3.00-kg rocket which acquires a speed of 50.0 m/s after travelinlmjt33*u s p zbgqz967g
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-kgl zyo: n- (zs:2lhzm4umduz(sh ;a .xk7,j+zb mass with the same force that you push a 10-kg mass from rem::n(47+zb z2(hhsmu-yaz,;ozj.lls x ukdz st,

  What is the mass of v8 hzer 7yn;csj0bi+fayy )s9 n/,3fba person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Earth whew+;llpmg-2 )/z vtwbere the acceleration due to grav wvezl bpg -lm2)w+/;tity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of t 3pnx/ da61bpu+8jro hd -2jewhe object on the surface of the Moon where dp+32no1/j6dbxurpwh 8 e -a jthe acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Emntgshx4: ol 89sy8m 9arth, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earsn9m l smyt9:h48gxo 8th's. Compare the masses of the objects.

  Sue and Sean are having a t;qsp7:nu1h1*gllrs q ug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Seq7 1ng1uplq;sr:*lhs an's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface.f9xxzyt b sruf5b+) -2 A force F acts on the stack, and it accelerates uystx -+z)b2fx9br 5f 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 ina; y1gr+xjm.+qg lsq . an elevator. What will the scale be reymlqs;q.g ++. ga1rjx ading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in 40 t lsagjrqhl4 dzf;h,1d,z6an elevator. If the mass of the person is 60.0 kg and the elevator accelerates do06r,dz;s ztg, 4l1 dj4afqhl hwnward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridd;3 r h5mbg-ca pt+/p)a+ ntqqes in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward withtmpp3d qn q arat;b- /)g5++hc an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act/gh wz8e(vi-u on a 5.0-kg mass. 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 ev-h8u /zw(ig N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held odp/ pfr/h28din place by metal brackets that can exert a maximum horizontal force of 9000 N. W d/8fp2p rd/hohen 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 truck. It iibjz5i 97o,feks4 fhtt2/g; vs 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 forward intoks72 5 gfjth ;zf9/o4ib i,etv the cab?

  In the Atwood machine shown in Fig. 4-1, if M 314 d1t6us4,mavisawrb ap5s= 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the 3a4w6a4vat1r 5i, bms pussd1pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kgo-fm 4+g 9c5)q n)zt g1eianif, what is the tension in the string? (Ignore friction and the mass of thefq aofe)) nc gi4-zn5+9g 1tmi pulley.)

  A student pulls a box of books on a smooth horizp -(uendmv8x 8ontal floor with a force of 100 N in a direction 8d m(x8- pnveuof $37^{\circ}$ 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 wiv9 nh9k2ej:m7c 77zdq g6ed5sa rn0hgth 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 echm5n67d9 z 9gker0s ajgn77d:vq2 hthe normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as she;-l6jv.zjos izz8ukub 94 ctj1nl :2own in Fig. 4-2. What are the tension;su8 -jolz.cjt9bn z2e zkl4uiv 6j1:s in the ropes?

  In Fig. 4-2, if the tensions i8zsh3uiy0b j h6lpp- zck( ;.cn the ropes are 50 N, what is the mass of the traffiy;u csj3p86l-0bzcp h i.z( khc light?

  Two boxes of masses m and 2m are in contact wit .v93bie z+gljh each other on a frictionless surfa+b 9igjv 3l.ezce. (See Fig. 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 frictionless s qtn-jjpg+0 h:a-b7 qrurface. (See Fig. 4-3.) What is the net force on the more m jt pqqrag-+hb:0j7n-assive box?

  Two boxes of masses m a0 /icm tx6omfzkf:s gi 6i ny;q,8nc-:nd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connectin6/; f m cxtz6ik0-:,ym gs :cniqo8fing rope?

  Two boxes of masses m and 2m are connected by a rope. (:r(tn/w7ak o oSee Fig. 4-4.) If the forward force on the more maw / oka7or(tn:ssive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running ow .b,8upm5e rover a pulley as shown in Fig. 4-5. Bwpu 5bm8o.,r eox 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 kinetic frictions between a 3.0-kg box and a dehklecwdjj1+n+ 8 zz01sk are 0.40 and 0.30, respectivel+wczj kl+ e8jn01hzd1y. 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 frictions for plastic on wood ar k5lo*rw)t l:a/sd *ume 0.50 and 0.40,ado )stluwk/5m l**:r
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 diryd;6ga*p:mzc kc.a/ hection. It slows and comes to a stop witmy;aha.c:6/ kgdz *cp h 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 pu sk7aarqm8z 5+lled by a 5.0-N force. A 3.0-N frictizm kqa85 sa7r+on force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a r9 , vg:svr0kemate 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 ,*:a v5 +h m0j4dzmitsqqf7q: ;t*if 2wgr fnx10 m/s. It slides 50 m on the ice before it stops. Wha,gf v7 qfm a*:q2j*sr :x 5ttw0nihqzf;m4+ idt is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police9kwih b7s554n xevv(qcyw 0 k5 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 prevailivc qnk bx5vi50 59y sw(k4w7heng conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stack d l 0k35ox17bsktp,tbed. (See Fig. 4-6.) The surface between the more massil ott0 b13d7pkk,xs b5ve 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 static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Figd;, g crzb;/ 51qovqaz(,z d0huozy1q. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If tq/uvqod;ohg0 ;a ,qr15(,bzc dzzy1zhe 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 inclinn2t) j-wfvp*ned at an angle * nn2 pw-tj)fvof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat 3pa)s146racp u,f sp qhill 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 twe a+ o)l 4neiz+cw70an 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 incl 17lqd r+a:6lu 6umhe3t cl2wcined 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 constwte;.g5nb h -m8p r fxmr46ee;ant velocity of 6.0 m/p-. ;e4rregb5;etwmf8 6n xmhs.
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 roughj:zdccwb19p3 3d4 zv c $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a masf ih) evvv(y4;coad* )k9:ky ks m slides 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 500 N along a rough surface. Thiho3; f /+ wzr6)*szoljzag c:e cable attached to the log makes haw)o3i;r* zgsjc zo /:6lz+f 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 tcs ta96jx28 -6nkojbz nl-u/ rh/:kgfrom rest on a rough inclined plane tilted at an angle xs6ghkb8 tcjj:-o2// rlka-6tnzun9 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 in pj) rr zmw1 w7c0bnxc8-5r,wncreased until the object begins to slide. The angle at which this ojpw5-)n xr0bnm 7w18czrc,wr ccurs is q. What is the coefficient of static friction between the object and the plane?