Which of Newton's laws best explains why motorists should bb6t9afumh,* f uckle-up?

  When you sit on a chai/v7 t)h9nl1trb4q n /d-( irjwr3hhnkr, the resultant force on you is

  In the absence of an externa-mfcv14 wvk +rl force, a moving object will

  When the rocket engines on the stao,vb)8tx )t me+olc5 arship NO-PAIN-NO-GAIN are suddenly turned off, while traveling i,))+5alt bcv xme8oton empty space, the starship will

  A rocket moves through empty space in a straight line with consta49:a c ejp+1ydlxba z2nt speed. It is far from the gravitational effect of any star or planet. l94yzb2 1c+jpedx: a a 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 suddenlybqr bsts,idt 6h6 217 zv6vfi0 fall forward. You can imply from this that the buv vi1srif 0762htqzb s6b, td6s's

  You are standing in a movinor3z8:m 0o wktg bus, facing forward, and you suddenly fall forward as the bus comes8t om zo3w0r:k to an immediate stop. What force caused you to fall forward?

  A constant net force ac0 gde-hxrkfnt u6387h ts on an object. Describe the motion of the object.

  The acceleration of an object is inversely proport 1.y2dvaajn )isi5hi7 y im7d;ional to

  A net force F accelerates a ma-ai eduf0nvesm tn;q:) n62v; ss m with an acceleration a. If the same net force is applied to mass 2m, then the accele)n qdeneft0a-un6s :i;v2 ;v mration will be

  A net force F acts on a mass m and produces an accea-hot 3h 7vciy hrokx8q-s5(7leration a. What acceleration results if a net forhih rst7(a8v73o-h-ykcq5 o xce 2F acts on mass 4m?

  If you blow up a balloon, and then releasebsq1q)2 :gqdk it, the balloon will fly away. This is an ilgsq kdq1)2bq :lustration of

  Two cars collide head-on. At every moment during the collision, tt b94nqb1 xz6x 9xosdpc1zn ftq0r16; x 58dmnhe 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 f;xnx p0 zd49 s5xtb9ot6 8crqnfd n6 11bzxqm1irst. This is an example of

  If you exert a force F on an object, ti7cy5,lgxadm 4t jq su7.48jthe force which the object exerts on you wils, 44t8 y.7c i jmq7dugtx5aljl

  Action-reaction force r/*) awfbo,bmsb4ve8s

  Action-reaction forc a*kk:uscw:--zva y,xes are

  A 20-ton truck collides with a 1500-lb car and causes a lot obp;r1r,fv ;paf damage to the car. Since a lot of damage is done ;rpvr1abf;p , on the car

  An object of mass m sits on a flat table. The Earth pullwqvt81o0x a38pos) x46 mgcocs on this object with force moxv8o314p6 ocatx 8qc w)gm0 sg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. T4qt); 0y wo;7hl n +tbplbcj85apn wt7he Earth pulls downward on the toob0w;h4taw5qn cnl8+pty;)7 jb7ptl y with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instanta)t,2uw5knhieo .2 azv neous force. The ball hits the bat with an instantaneous forc.aziu )teko2,vn 5h 2we, whose magnitude is

State Newton's three lmcno i3z )on9+pjc 5n8aws.

  Mass and weight

  The acceleration due to gravit)x6 z edcb*mas) .hx9e g8 5kcd2b-skey is lower on the Moon than on Earth. Which of the following is true about the mass and weizcs )x)-bbx*k 58echd m.seag 6d9 2keght of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a diw.d 4 /r7jkr 7tk2jymestance is

  Who has a greater weight to mass ratio, a person weighindpy m;sbm 6s fh: +: etm0nye2+ub91ipg 400 N or a person weighing 600 N;2bepumh+bepm 9y f6::i dms+y0s n 1t?

  A stone is thrown straight up. At the top of its path, the net fo24at+kxgl 0w +tafi7 erce acting on it ti4 x+ 0ekta a2lgf7+wis

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heigmir*w2rco5*f ht. Ig *2*oirrwm5f cnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective terminal velocitied+t08qxf fhoq 7 07tvbs. Which object experiencexo 7vtbqq+d0f8 h7tf0s the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an elen op j: tdudk,b/(,ytg;gdf0 )vator. The elevator is moving up at constant speed. What is the tennf d0,: ;(dg)gdt,boj k utyp/sion in the string?

  An object of mass m is hangi +yqqlw. 2jc7r0/ajxing by a string from the ceiling of an elevator. The elevator is mov y2. wc/jq0iq j7x+raling upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icy sidewal9r( 1 jr7sub9pn mv*nck is

  It's more difficult to start moving a heavy carton from rowh12* .mknnqs4 k jluse a+(/r/,jwhest than it is to keep pushing it with consr1/h 42.qu wnse ,+kah k so/w(*jmjnltant velocity, because

  A horizontal force accelerates a bo2(vs:4)f(yxk 0 w lbz tghxm/nx from rest across a horizontal surface (friction is present) at a constant rate. The ex2lwxt(x (g)v hmkf0 zynb/s:4periment 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 e6c: qv pe6-vvdown an inclined ramp at constant velocity. Thus we can deduce pev:q -e vc66vthat

  A block of mass M slides down a frictionless plane incli4b+(t *xwe4vs vexuv;ned at an angle q with the horizontal. The normal reaction *;sv bwe uv44t+x(ve xforce exerted by the plane on the block is

  A block of mass M slides down a frictioys*+ wql/)s8d7wtq d3)sbmu1n ysyq8nless plane inclined at an angle q with the horizont)+y*m ntsb dqld8 8)y7ws 3q1 sqw/uysal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an angle;mwn qy muk a11j9)(qoru0 sy6,vx1ad q with the horizontal. The d1, omjrs1(x9 n0w)ymyak q u1av qu6;gravitational force is directed

  Two toy cars (16 kg and 2.kd14 t krb:6pw0 kg) are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whkt6p1 4dkrw:bich best describes their acceleration after being released.

  An object sits on a frictionmdz/ )9yogm:nless surface. A 16-N force is applied to the object, and i zgmm: /y)9dnot accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate b 9fydt q,4 1kzy3vm 2(q)wg8olmuvt nc68;a zfrom rest to 27 m/s in 7.0 s. What is the average forwaq2bwu8lzt;6f9g 81naqy m mtzo,k3v )dc(yv4rd force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. W*4 szatw w50mghat is the ne t5 zww*gs40mat force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquir*z6hzmz r46mzk4zw j9f av23fes a speed of 50.0 m/s aft*w6 a4 m6 zhzz4jkz9vmr2 fzf3er 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 w88*tdt2tubr dzw9l4f ad *bc f2 nb:.mass with the same force that you push a 10-kg mass from restf: n82t*wfw 4zldadr82b*tbb.d ctu9 ,

  What is the mass of a person who weighs 1st l 27zv.+fao10 lb?

  What is the mass of an object that wu i20+abjs:w 0bqv jg)j5j4 aieighs 250 N on the surface of the Earth where thvwbabg j5 0:qiasj0)ij +4u 2je acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is thfy,dxlcza)e8m 271 dme mass of the object on the surface of the Moon where the acceleration due to gravity is 2 cy)a,d8zfexm 7md1lonly 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on utpd5:f5 tsam :m,77ir,cj qlthe Moon. The Moon's gravity is one sixth,:7mtpdi ,m7ql5u:5 ja rcf st of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite *s9z9:mvkrgs52akq64 a cz ,7owwdliends of a 5.0-kg rope. Sue pulls with a 15-N force. Wha, v64q 9zdlc2rw9 7sm kzk5wsagaio:* t is Sean's force 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 o5 ad/vc hhv6q.n the stack, and it accelerates ah5vqdc6 v/. aht $3.0 \; m/s^2$. 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 scaf297obh p2ys +p*/k b qubjud8le in an elevator. What will the scale be reading when the elevator is* sqb7jpy829 /bhu +kb2o dfup accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person im ojawrb+t m0- p-y+:ns 60.0 kg and the elevator accelerates downward with an accelerwbm+:ty omjr-na +-p0 ation of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 ve7zbd v7)3gbx.mjha:7 r2jhw3go m1 kg and the eleva72m :aorh.77j1v3wx edzvhb3jbm) ggtor 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-ke9;3pueb*ja(*crb4 ,zznvlgo(d l ftm1l 6w8g mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magn mdfe, v ( oj 8cpl1zbr3b4l**(wtaun9ge;z 6litude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed ojq+ 2wcru*o)d hlj t,4f a truck. It is held in place tw j l qrcdhuo)j24+,*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 cab?

  An object of mass 6000 kg 1j 4s(m-zusjorests 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 traveling 15 m/s, what is the minzs 1m( uoj4-sjimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 6g,-4j xgtp)eg .svgiq+nih) 0.40 kg, what is the magnitueqp , ig.4ni-h+)g vgg)6 tjsxde of the acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M =8 obi)pt /y0r7 qhbu:elw+q 1c 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pullt) 7ihbeq0 +c8b lrqop:1 /ywuey.)

  A student pulls a box of books on a smooth horizontal floor with a force olf1.nj y m5k/af 100 N i kj5nylf1 ./amn 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 smooth horizontal floor with a fohp y4 z:;vdng5:l: 2ntb +zzftrce of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the bookt2ngz ynv+; lhptz 4::5zfbd: s is 40.0 kg, what is the normal force on the box?

  A traffic light of wel+db f-nm* bc8ight 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes nmb+ 8-f*dblc?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of ,rrt y b./ )vsuxvk-lg*q6xx/the traffic ligtrx6q vx)r-u/,sy/x bl*.vgkht?

  Two boxes of masses m and 2m are in contactd* z95;tlohgk with each other on a frictionless surfaceokh g;9*t5zd l. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eqi2oqtb0 - )cjach other on a frictionless surfacoitc2qjb )0 -qe. (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.) w v+mw4eefv ac+i )9f( If the forward force on the more mevw(++e 49a)cffvm wi assive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are crhtrn/o6r uc: uql31 )7.xbwdonnected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F7do u u 61 w)x.n3qbrtcr/lhr:, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown1m7t(ivcudnr a 49p)e in Fig. 4-5. Box I o9n(7)apc1m etiu 4 rvdf 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 +50q .qmqjx 0pje,dvm.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 isq5., pmjvdmj00+xqeq applied to the box?

  The coefficients of static and kinetic friction om u ;vq8h7tpjd7r43tauy +l.s for plastic on wood are 0.50 and 0.40,7rto87;u upd.yv tjq a+hm4l 3
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 c9o2c.2 j m- jnjq;hmhuar /7lslows and comes to a cmh9-cj2 oqjln7j hu/2 .mra; stop 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 h(.3sccyp9fr-v -z )irlt2p ahorizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the ap-rs2) 9iflv-pcc(zryth.3 motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, frosj.x fd*f;6l 7 yaqw3um 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 initial;oocr-g,jyj9ai3 si123(xy * zquhrs speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinu yx( cr qy3;h3o*1g-j9 2iraoziss,jetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 9o;cut x wh;*ewb*rjus 01ml935l/ (1 yarjaaf0.0 m long. They determine the coefficient of friction ba /abl jywe;51uuhm xrw3*fa0; jlcrt* 9(1osetween the car's tires and the roadway to 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 a4f qxk9mex;a:0i2kzhdyi /: ure 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 the more massive box, what is the s fmxk9xd q4zi2ua ih;:ye/: k0tatic friction force on the less massive box?

  Two boxes of masses m and 3m are stacke /c ./;mx )b-fzb bmu-4nvndxqd. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the-dn-nc/4xf/.bq b xmmb;vu z) 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 i s8, lfcfkla js-g -*nkfjzc;y ;1k5l8nclined plane. The plane is inclined at an angle of8lfs;*jc y f js1z, f-kclakl8gn-;k5 $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle oft x quq:-3:*yljv.zrp*ca/od 7 5hsjv $10^{\circ}$ 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 angle o p3h ezny,;r1wf $37^{\circ}$ 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 inqiv8j(:. 2xves2 d849c9wjbfy clsusclined 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 ifepf b ,/xw3o5h.jz l0nclined plane, at a constant velocity of bpoz. f,wlfh5e3/ 0xj6.0 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 j (zb,y11on q x7t7vkddown a rough $37^{\circ}$ 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 do+*jnpxq,c zg 4xb ,y qve4.tr5wn 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 9nko, fx;dq;qf2vh: 5nc ) -bclj(wkm500 N along a rough surface. The cable attached to the log m9kd( )f;nblj:m 5f2qxcw oqh,n;vc -kakes 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 t vv yi.u3hlu8ezuy4fn6+ 77qbilted at an angle v4zuv 7lh qbe iyf73.y+nu8u6 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 pl s9loqb2utn t dm9wl 89imp-kf7wh1fd .pm083ane. The angle of incline is gradually increased until the object begins to slide. The angle afk9t97iowd1d-9w. pm tb l 3m uhpln28mqsf80t which this occurs is q. What is the coefficient of static friction between the object and the plane?