Which of Newton's laws best explains why mot (u*pjxtk;:0fsm k* cforists should buckle-up?

  When you sit on a chair, the results 0h9f7w h-ucsant force on you is

  In the absence of an external fquapc .977knx5 c;zcw6k cp dy2,wui) orce, a moving object will

  When the rocket engin xic,3+-vd(iixvbq2bqdf + * nes on the starship NO-PAIN-NO-GAIN are suddenly turned off, while tra+xndid q+ ,-( cvfb3v*iq2ibx veling in empty space, the starship will

  A rocket moves througm(nzb, w5e2po7 yte09hide+ jh empty space in a straight line with constant speed. It is far from the 2+m7obeey0,9i t5je(npz wh dgravitational effect of any star or planet. 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, 41 wrvgnfq 7-yand you suddenly fall forward. You can imply from this th- y1vfr w7n4gqat the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall for2rq,x3)ptg9 s* cmc w41hhzik /3irm zward as the bus comes to an immediate zhtrcs1, / h*9k)z mmp2rcq i3wg4xi3stop. What force caused you to fall forward?

  A constant net force grm7* )9z,gp6u7koi / nd hqfqacts on an object. Describe the motion of the object.

  The acceleration of an o0dqf8b xvrfoq69-x m;bject is inversely proportional to

  A net force F accelerates a mass m with3h 3ew/fjc +ak an acceleration a. If the same net force is applied to mass 2m, then th3c3ewf/ak +jhe acceleration will be

  A net force F acts on a mass m and produces an acceleration a.8( d1uz u:rfwy What acceleration(u r:1 fzwduy8 results if a net force 2F acts on mass 4m?

  If you blow up a balloon, and :nfj9tzh qnet5.;w4f then release it, the balloon will fly away. This is9qj4nn;:w zf.f 5thte an illustration of

  Two cars collide headkmq9n -xbdaf*3ga8 w 3-on. At every moment during the collision, the magnitude of the force thebmag3fk d q-*n3ax w89 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 F31w jdlz76wb w-a3 oue on an object, the force which the object exerts on you willj 6oea3 dwwuw3b-z7l1

  Action-reaction forco dci99eh-;iwoe i1g9- b; hkces

  Action-reaction forcevtf9xhvq, aaw;(9:wfs are

  A 20-ton truck collides with ,(yyhwli4e /,rdxkc9a 1500-lb car and causes a lot of damage to the car. Since a lot of damage( ,hxi4,cdew yylkr9/ is done on the car

  An object of mass m sits on a flat table. ed:xo;e50i ggrkty 5y k2t 2)u The Earth pulls on this object with force mg, which we will call the action force. Whate2gyk5k5rg2 o;x:tey0tidu ) is the reaction force?

  A child's toy is suspended from th+b9 7 jwo29v90c uml +iwxtiure 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 "relor0 b jw7iu 9v2tc9u+mwi+9 xaction force"?

  Your bat hits the ball pitched to yo qjlepj 0 ab18x7dxq06u with a 1500-N instantaneous force. The ball hits the bat with 0j6 17xjlxqd80 ab pqean instantaneous force, whose magnitude is

State Newton's three laws. xqatcv151grqwc6ptf0: j 3m +

  Mass and weight

  The acceleration due to gravity is lower on the Moon z4hla:2nroei9tprw41acjy ot8e. 64 than on Earth. Which of the following is true about the mass and weight of an astronaut on the 6t azrp j9e.r41nt4 a hoyw8o:4 ei2lcMoon's surface, compared to Earth?

  An example of a force which ai4pe0 bmr)+ ses.8mg ccts at a distance is

  Who has a greater weight 8 *bn4n cgqe6 wwhj/c;to mass ratio, a person weighing 400 N or a person weighing 6hwnw ;jnc8 6bc* e/q4g00 N?

  A stone is thrown straight up. At the d70s -3+ea,xh xnkvgu top of its path, the net force acting on +x37s, ngvd ae kux0-hit is

  A 20-N weight and a 5.0-N weight are dropped simultaneousl tft35jlnjarv0/ +br 0y from the same height. Ignore air resif/ja 0 l0rtb+3jt5 vnrstance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective); ;c(p uriwb2fgnc2 y terminal velocities. Which object experiences the grea);r(gb u22 ncwf piy;cter force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator.p3k1 o p37kg/;cmcg*skqk b;j The elevator is moving up at constant speed. What io;kg*ck/p1 ; bcm3pqgs 37kkjs the tension in the string?

  An object of mass m ilbe4xp r)((;e+inpufi, , p 8pfxu6y qs hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing ,f lnif; e)p, qupu+p6xyxpie4r (8b(down. What is the tension in the string?

  The force that keeps you from sliding ce-g*f9lz ujv ixdj4 t3 cv65asq09o96nq-xhon an icy sidewalk is

  It's more difficult to start moving a heavy carton 2ocp.(;.bfb al)b;uf sau.qgfrom rest than it is to keep pushing i2;csou)ublb q. fp ;ag a.f.(bt with constant velocity, because

  A horizontal force accelerates a box from rest across a horizontal surf+ w;-,ptt dx.zz9g xtoace (friction is z;9 g-ttx ptd w+ozx.,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 v50v3/t5p(q qewycq*cyu eu 7welocity. Thus we can deduce thayeupceuw qtv(3wq c/q 0755y*t

  A block of mass M slides down a frictionless plane inclined at an angl *z( v; 7fpzqu52/jzthycg5bd e q with the horizontal. The normal reaction force exerted by the plc*y75 2fzjg th(/dqzv ;b pu5zane on the block is

  A block of mass M slides down a frictionless plane inclined ahyx: xb5euh yh+ 6i98zt an angle q with the horizontal. The normal reaction force exerted byh5by uzyxeih :698hx+ the plane on the block is directed

  A block of mass M slides down a at :) vw(1meuicf2ie-e rn)b 8frictionless plane inclined at an angle q with the horizontal. The gravitational force mi(: f )rc8i nea-be1)vu2 ewtis directed

  Two toy cars (16 kg and 2.0 kg) are released)ak0fp(duuu:8y xp ca*kmt .3 simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describ:tmukay3a cp d)x.ukp 08 u(f*es their acceleration after being released.

  An object sits on a frictionless surfac y:dt0cj0)sng e. A 16-N force is applied to the object, and)sdc0ny g0t:j 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 s. 9) b h*6ynckje What is the k* e6)bcynh9javerage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed oku.vei. ;mh.jf:q om;f 8.0 m/s in 2.0 s. What is the net force actim qkjf.;.mi;ou: hve .ng on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s1ydl) 35 fnpli :lwx2l aftx p: lwl3y1d2l5f)i lner traveling
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 samemw32oopsjb: ae2 no :1 force that you push a 10-kg mass from res:oo2 pmjab o13w ne2s:t,

  What is the mass of vv.:t 9 ljavfs2ou-w, a person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the xl2k+g oh7w,.a k kqc1Earth where the acceleration due to gr7q.go h+xc k k2,1kawlavity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on t e cv ,kmyp:-eb :qfh753xgyl8he surface of the8v:mhpbel- fy g:c75kqe , 3xy 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 ot:pouo1au 9j3kq)s/xn the Moon. The Moon's gravity is one sixth of Earth's. Compare t ut9pj3qsa)ukx :1/o ohe masses of the objects.

  Sue and Sean are having a tug-of-war bep e 1: el40gft8yd m)tvd*)uny pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's fo)elf*d8 1mgeypev: n) 40utdtrce if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts 8c,gszztr0ws9 t 5s;, p 1wvwgtmg/v7)uqxl5on the stack, and it accsgu)71st 5,zx pz9m5gw 8stqtv ,g;lcwvwr 0/elerates 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.g-qwq 13i lihq1r5atg;w;ls6 What will the scale be readingl165-iwgqq ;la1twsiq ;g3r h 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 qj,qf, vtb1:fperson is 60.0 kg and the elevator accelerat:bvj,qf 1ft ,qes 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 j.ek/ y +r q)imps+pn*the mass of the person is 60.0 kg and the elevatormky+r j .p)nsp* ei+q/ 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 0cpj2 dex)ae:mass. One force has a magnitude of 8.0 N and is dirdejc20 eap:)xected 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 a trt 5rzo 2u6skz3uck. 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 distance if the load is nout362zz s 5krot to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place uoec2tlj,w /5by metal brackets that can exert a maximum horizontal forc,l5/ewu 2t joce 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 into the cab?

  In the Atwood machine shown in Fig.,g,6oynmn ,o1 izrss, 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Iosn ,,oz y1ngsr6, mi,gnore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 5u5do oki7ev *hun)4sk+wqw;0.40 kg, what is the tension in the string? (Ignore friction and the mass of the 5v kwo5)ok;sdq ewun4+ i7u *hpulley.)

  A student pulls a box of books on a smooth horizontal* k7vo3(l rxkv5g+kiy floor with a force of 100 N in a dirlk +*vgvk xoi r75(3kyection 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 fl hyu3s k8/7z ntc;46s8sfhb lkoor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books7zu88s4k6 nsfsklb; thh/3 c y is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2cd 2a0aa1dq u2vk*w*e :dqqt x40 nr+n. What adukcnawq 2dd r1a20 xvn*:+aqqet *40re the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what ohc0cv60h.t tis the mass of the traffitc.v6 t 0hoch0c light?

  Two boxes of masses m(z:c pj ik3vh8 and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleratiok 38hc jip(v:zn of the more massive box?

  Two boxes of masses m and 2m are in conta :+zeac5yoj2t ct with each other on a frictionless surface. (2a+:oz yec5tj See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m an hqov-.c hj(2dd 2m are connected by a rope. (See Fig. 4-4.) If the forward force on t2qjdv.h(h o -che 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. 4.1ivrda 8(ipd-4.) If the forward force on the more massive box is F, what is th 8ad(vrd1.i pie acceleration of the less massive box?

Two boxes are connectedv :74k5mg jkm( 2hwwdp by a cord running over a pulley as shown in Fig. 4-5. Box I of maswm 72vjwg(:d 54hk mpks
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 7a qukkxe)thx1d73u /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 is appl k duu3e/kq)7 xx7ath1ied to the box?

  The coefficients of static and kinetic frictions for plastic onha 97p/qw j.ccx: e3hp wood are 0.50 and 0.9 c .ehx/ppaq7cwj 3:h40,
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 ty ;,bno kaq.0tzihj(b3 6h +seo a shh3bqa,(+ks n6 y; z.o0bte ijtop with 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 pulleb(bb.ak-b(( uf9m czj b9qu3sd by a 5.0-N force. A 3.0-N friction for.k bu9fm9as- u cq j3(b(z(bbbce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a yce2/2l fn k1j4.0-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 initig1f*bam)j9h ci. 6r ifal speed of 10 m/s. It slides 50 m on the ice b1ci g.h* mij6r)faf9before it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigationipsohw0;;u5 dzh/ bvc6 *z)gg 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 roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the ozb p*g;uhd5g6) /; cz0i hvswbrakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surfa vsivi) wpl,o5ep;x-cy1 -q8r ce between the more massive box and the horizontal surface is smooth and the surface between thc 5l-8roi- pq;y) x,i ev1psvwe 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 wlsx sk t8d:/3m and 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surfat8 kslxw d3s/:ce 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 inclined at an angl7 gdef(al 8u0ne ofagl(0 en8u7df $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mak-kyb1 5wqxjktd( +i8 mes 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 angb hjp0kavz6 88le 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 atxutq)y8pfimi fb 1 /.zqv.d ); 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 plhpljw t sc(d ,8;/bv. nj,cy3pane, at a constant velocity of 6.0htbd,.w3 p8s cnjcj/yp;v, ( l 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 down a yuxr6kg q1wj(/v 5-5(qw flvlrough $37^{\circ}$ 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 downt b 5s4kr+lp8:w n:hau 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. Thtg) j+yq jbaa-- i7yaif78 jlar.3(y8y*h hzme cable attached to3b8ajfj+iza iy m) hylh-ry a q-tg.8y (77ja* the log makes 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 from rest on a rough inclined plane tilb154h 4tnu fqhlxi-:eted at an angle1:- u4q 5iln4xf hhbet 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 a so gw-wj3+-pb)sggw0n 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 the coefficient of static frictg+0bg -3jpwsows-g )wion between the object and the plane?