Which of Newton's laws best explains why motorists should.qxu6f*+6d l2fpel,dxgz6z55 whpf n buckle-up?

  When you sit on a chair, thcjba8 7saa.hke n. fa 6es*4vrtz,b**e resultant force on you is

  In the absence of an external force, a moving object wi3 vwud)(iv6x 68wz vqkll

  When the rocket engines on the starship NO-*s ,p;t;lkfq rPAIN-NO-GAIN are suddenly turned off, while traveling ;;s p*lq,rtkf in empty space, the starship will

  A rocket moves through empty space in a straight line with constabtkl;c5a*: zqud yl9 8nt speed. It is far from the gravitational effect of any star or planet. Under these conditionsl z t8d9bkau qy5*l;c:, 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 suddenly fall forw;hx*c ar/q-eu.y,w :4rsab k gard. You can im,*sq y/ahc:x ka4.re- ;rbgu wply from this that the bus's

  You are standing in a moving bus, facing forward, and2vh10lxzri rw2 v036az csc4h you suddenly fall forward as the bus comes to an immediate stop. What for i20xc2z 4rhcwh3v60laz1vsrce caused you to fall forward?

  A constant net force act max;( ) w4,.qft0 c3fwne2egypf5dems on an object. Describe the motion of the object.

  The acceleration of an krm*;jwdw:7w:6 tqs cobject is inversely proportional to

  A net force F accelerates a mae9;a ssf7sa1gn o f:2xss m with an acceleration a. If the same net force 2 og fxs7ase 91f:;asnis applied to mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Whaf41zs mw:m om9 qj8u+tt acceleration results if a net force 2F acts 4uzs9qmo+ 1:wftjmm8on mass 4m?

  If you blow up a balloon,m0 yuj+ e+pq 14giy2bm and then release it, the balloon will fly away. This is ay+i qe1u m2pm+ j4b0ygn illustration of

  Two cars collide head-on. At every moment during th;0t ue gkwb0+3ma0 rfwe collision, the magnitude of the force the first car exerts on the second is exactly equa 00kmew3a0 g; brf+utwl 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 force which the object exe8fifd9f)9 c ajrts on you wilf 9af)jdc8 fi9l

  Action-reaction forces z ax(u (4yo6wcdxfyp4z:z4 u8

  Action-reaction forces arozv 9;s /t ffo12tax-wy45ci i2vqb .ce

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage b zr0xh-xq76w to the car. Since a lot of d q0whb -z67xrxamage is done on the car

  An object of mass m sits on a flat table. The Eardsm3sr xkb1+u30 g um mqq02t1th pulls on this object with force mg, which we will call the action force. What 0m2qgm x bm1u+1ssq3trd3uk0is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ea/62io u.1-oitq5ielv ns ybc4rth pulls downward on the toy with its weight force of 8-oq 6l t.5sin c1buo/iiv4 2ey.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forcem : qy )67affs:(b4scglsgg-c* hv8 en. The ball hits the bat wcq4sgslh- m)b6g:(n: g 8y *easf7fcvith an instantaneous force, whose magnitude is

State Newton's three 1y+1v.k ca;j kw3d-.c limpgjlaws.

  Mass and weight

  The acceleration due sg l )r e7(5ou i:/ks(ew8 60iwjdsfrcto gravity 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 surface, compirc7u)g6s/:0 ls eodjwi wsf ((5ek8rared to Earth?

  An example of a force whichgln3 g72 p+6ykk nea9v acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person wedrd o mem5(6*wig r6 (dew5mm*odhing 600 N?

  A stone is thrown straight up. At the top of its pat +.iq3.qo czmf65(j;ufrihce8z5 g zoi6 fo4 bh, the net force acting on i +iz83fb zooc5ijif (4.ez6;gh56 o .mquc rfqt is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from d em1,b: rnzv:3;:gzrowm)axthe same height. ;dwza::rvb:3)ne1 rxm o ,m gzIgnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respectivw s*.3xwfr hv+e terminal velocities. Whic* h sr.w+vfxw3h object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling omox390gtd:0j 3 udfg xf an elevator. The elevator is moving up at constajx0ug fo 9xtg033dm d:nt speed. What is the tension in the string?

  An object of mass m is hanging by a str s);3p sl5 up3ggh8n-iit )kpming from the ceiling of an elevator. The elevator is moving umhs3 i s5)8ti kpng);lupp-g3pward, but slowing down. What is the tension in the string?

  The force that keeps you from sno u,t;ti: ,p4fta:exdw 71hpliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than.(d lorvkw 4zm(r4fx4z./nfk it is to keep pushing it with constant velo l/ .kmzfwz o44(4.dv xf(rknrcity, because

  A horizontal force accelerates a box from rest across a horizontal s105i 0t+ 2m ttxepc zdbyty*6qurface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is double0tcympe1+ib5t * x2y0t 6 tzqdd. What happens to the box's acceleration?

  A packing crate slides down an inclineck 2youkd *earl(1 m5tqj84 g0d ramp at constant velocity. Thus we can deduce that51r m qja(yk *gde0ct24ouk l8

  A block of mass M slides down a frictionless plane inclined ainwe6tzg/ e 8l0u ly))t an angle q with the horizontal. The normal reactugi nl)/e86z e0)lw ytion force exerted by the plane on the block is

  A block of mass M slides dow n* 2l7mqhe7bkd lgiuic4,6 r,n a frictionless plane inclined at an angle q with the horizontal. The normal relelkc,ung rd mh*i ,76 2qi4b7action force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined f-r+;mu hva3v at an angle q with the horizontal. The gravitatiu+avh;- m3 vrfonal force is directed

  Two toy cars (16 kg and1s+oeqo6 7je ,f19c: tf,hbd zaaz:i m 2.0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their a,jidt: 9o ohff6+1:bz ma1e caezsq,7 cceleration after being released.

  An object sits on a frictionless surface. A 16-N fo xyo1lwp+lbqs 7y4p+ .rce is applied to the object, and it y++o l4. lp1s7yp qxwbaccelerates 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 7o9vdb r-o( mlv y*w33m vrq8dwcvz/3/ .0 s. What is the average forward force on the cav d( yrv3vmv dow/co8zl9b3m3q* r/w-r?

  Starting from rest, a 4.0-kg body reaches a speed of 8as k9d6g.v58 zpcy 3ldek 4;as.0 m/s in 2.0 s. What is the net force acting on the body? .5e6psgzsdk a89ycka ;l4v3d

  An antitank weapon fires a 3.00-kg rocket which acqk -pbzecu vc;xrr 4-q u)du:9)uires a speed of 50.0 m/s after travbr9--e4 xqr) )c p:v cuzku;udeling
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 fjezjk( kmqtd6rqp ,.t;6 )sp3 orce that you push a 10-kg mass from ret6,ej6 jpk s3d kpm)qtzq. r(;st,

  What is the mass of a person who weighs 110 i(rv(/:1(r yvncuktx )ayo;i lb?

  What is the mass of an objenoj0zej i2 yy0: c,zbzu1nf;,ct that weighs 250 N on the surface of the Earth where the acceleration due tb , ,ezn0;c uojzyz:0fji2y1n o gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 7* e4jzty 59wolp13/ydd ypa nkg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is onl1 7 po94nedy /t*pj5wy y3azdly 1/6 of that on the Earth?

  Object A weighs 40 N on Earthm..q 6vt)d:w ftuf ig:, and object B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objects.) : if t6vq:wgum.d.tf

  Sue and Sean are having a tug-of-war by pulling on opposite en-tdk.v1yn/ 74l- hhyzjd+ rbnds of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acc k.+rthyhy 7nzv bn14lj- /dd-elerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests m /p1t .ds/8x ek*uxdlcv1*c sv)dk8 don a level frictionless surface. A force F acts on the st1v./d)ctpx u d *kkvsdx1se*/ dcl88mack, 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 480 N stands6qm -csbq e ciyo 7-ton,)v+ui,csi-0 on a scale in an elevator. What will the scale buiqis- m)o-c6i70cv+oe tsb-n,yqc, e reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If theu5 rbyl*r8o pesrr) 9; mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration ors)rp9e b *oru ry85l;f $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an ele qky81i.i*y+icc vm:dvator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an accd+cqy*i ym18k.v c i:ieleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force haspc*;* ;gya5k lhgcnx uh69y8n 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 acceleration of the map;a 5 hclhy8c*g6;*gkxu9 ny nss?

  An object of mass 6000 kg rests on 9(r ph 4q yvtuut q).sk0/nw893nkfab the flatbed of a truck. It is held in place by metal brackets that can exertu u0q kwtq9af8.kr/b(34ntpn9) y hsv 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 y+ ,2ahx m-oxtrests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is travelinhy-ox 2, +txamg 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 inuso jd)z jhm/k4s /my4m 2c;58fdumv 5 Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore of48ch) mu uvysdzm msj54j//;5md2 kfriction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 8-m6o(2pdrd,usykq r 0.60 kg and m = 0.40 kg, what is toq s-rdp mr2duy8(k6,he tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontax i7z.;eb lehg8h+*khieghj0 48xyb9l floor with a force of 100 N in a direction of e0 4.j7ih lbh ;zb8 kehey9x+xh8g*gi$37^{\circ}$ 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 100 he: (cy,;obwb N in a direction of 37.0e above the horizon;o(b:e wb ,hcytal. 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 supported by .1z;;dmcwm;f t3hh cjtwo ropes as shown in Fig. 4-2. What are the tzj;w f.mc th;dc h1;m3ensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of thp:0jbv q ojz,:/qpt:te trafo/j:p:z p:,v0tjbq tqfic light?

  Two boxes of masses m and 2m are in contact with each othei5ikh-ackt c uyshz d( 29f5rl; l29p-r on a frictionless surface. (See Fig.sihcc hfk dlrl99ty-22 ak;5iu( z5-p 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 frictionlessqf 97acik2zm7c1 ;yfh surff;z 77 qy1ci akmh2cf9ace. (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 Fig. 4-4.* sjoem/vk(34/;8wqjp s kljf) If the forward force on the more massive box is jo4s8f/ p qe jks;k(v/* jwlm3F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) I8sawldrbe) vp *hycbgm gn )j3,h652 0f the forward force on the more massy6a8rwhbpgs, 2)gcl3d 50* je)mnhv bive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over 9y le*ejbg 3-/ta zzj+a pulley as shown in Fig. 4-5. Bo - jtbejel*g z+yz3a9/x 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 fric9v1rrqcj aqps) oybyisg.5 8p7)r k,8tions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. 1 ibro)spqr88kjq,y sy5v arg)c97.pWhat 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 plasti2e n;5oh.3j8cwuyf on c on wood are 0.50 annfy8un.jw o5ch;3o2e d 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 atz fd8ce,1b-u nd comes to a stop with a conse8 bft1 du,-zctant 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 horizobc. -szpy *5(ydww -drntal surface is pulled by a 5.0-N force. A 3.0-N friction for dp5(*dysyrw .-cz w-bce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 Nzh/ .hcvf0x0g/y/.f. zr2bkvx skb2c accelerates a 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 puck lqro;-g 0nj/ iis given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic ;qgl- 0r ijo/nfriction between the puck and the ice?

  During the investigation of a traffic accident, lmps,kv * t cc9b-70rtpolice find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway tomr7- *p, sktctvl 09bc be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stackedv bl1b)2w c xhw7/e;0 lpvrr*w. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and wrbwl71 ehb;x/*2cv)vp 0 lwrthe 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 (inq6uj 1 kpv4y.x6fe 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 lev4xp6 neif1yjq uk6.(ss 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 planeybr3uph.uo3k3 bzw(cjyb5( u 9f8 n6 z. The plane is inclined at an angle ofp8cz3y6 .yj (3 5ukon (wbrbbuhfu3 9z $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill yc:c8u p*6(nz) qly+lz k5:+gna gymathat 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 smn6cf -3qe zl0 3fk+fcaooth inclined plane with 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 inclike6wj:q.;adk)hpqc 1 ned 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 inclined42gw b5ly*r ol plane, at a constant velocity of 6.0 m/s.bw2gll *oy54 r
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 rou8mws. ic:h)/smeg;s;fz9o x qgh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m sli92 dmaw 8;omak4b-f+cwos 2si des 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. The cabu 86l2sxdx( ,qxgcuj0 .tieh+ le attached to thehds+jilexx8( uugt6q.x,0c2 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 onhu ejh7+f mrrjo-8o,qnr cqx-+7 .1 z-( ndpzj a rough inclined plane tilted at an angle 8rm+ezq1c nrf o+,xjjqzdp7r-.jh(7uohn- - 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. jzet;em9 t 1a.y7s5sc The angle of incline is gradually increased until the objt j5e.9a1 syts;mecz7ect begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?