Which of Newton's laws best explains why motorij nbsx.t8px7;n3l n7csts should buckle-up?

  When you sit on a chair, thenu f1vvol 3(k( resultant force on you is

  In the absence of an external force, a moving ob s:) zgnb:l-t8;jxalzject will

  When the rocket engines on the staro71r/3ny aqi lship NO-PAIN-NO-GAIN are suddenly turned off, whiqr a31/inoy7 lle traveling in empty space, the starship will

  A rocket moves through empty space in a straight line wi kb8m1 2rr+hlqf qy8)tth constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the r fhmk 8 2y1tlrrb)q8q+ocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly fall forl*ph hnka(bcd1v 75 b4ward. You can imply from this that t hbkvdc7p 1(b*n5ah4lhe bus's

  You are standing in a moving bus, facik8 v vbhn7okr w7((+mcng forward, and you suddenly fall forward as the bus comes to an immediate stop. Whatr 8 nokbm7c7k+( wvvh( force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the obj, kg56 trzph2bect.

  The acceleration of an object is inversely prq,j 0t8 l+tsjw e( a.3qwkoui/oportional to

  A net force F accelerates a mass m with an acceleras gf)lf za9acfhz+ ,*;.zk7uftion a. If the same net force is applied to mass 2m, thfa 9sz *+l7 z;czhfg)fkuf,a .en the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wha k8ucjdxjy.77kdc/g+ t acceleration results if a net force 2F acts on mass 4yjjd 7c+dgkk8u7. /xc m?

  If you blow up a balloon, and ther.*m p8i o9d4sm,hb.i8zd o lmn release it, the balloon will fly away. This is an ild.4o p.zmhsm doi,8 9b8rl*imlustration of

  Two cars collide head-on. At every moment during the collision, the magnit2p5 dp tm.1.e aeyfty+ude of the force the first car exerts on the second is exactly equal to the magni.tdaep2 +pft1y5m.e y tude of the force the second car exerts on the first. This is an example of

  If you exert a force F on(6gd7owby s h8 ohv;f uuop8hc6q*-1c an object, the force which the object exerts on you will6s dw8oh8y;h (gohcv1uo7fq-6 p *b cu

  Action-reaction forcet f033 m7l7ooe ,3eww,5jokh wcxlj 5ws

  Action-reaction forces 9w s ayrtfiwdl: g8*1;are

  A 20-ton truck collides with a 1500-lb car and l1hb t,, -fnhlcauses a lot of damage to the car. Since a lot of dam t,- hh1fbl,nlage is done on the car

  An object of mass m sits on a flat table. The Earth pulls on this obje:u jzfywv2p(-9.ps 7vi0 hvuhct with force mg, which we will call the action force. What is thfiyv7vw ppu20(sj9uhh v z:.-e reaction force?

  A child's toy is suspended from the ceiling by means of a string. T 53ggj;g+suvl hnn4k:*dn3huhe Earth pulls downward on the toy with its wuv4+ j3ngg3 l5dgnk: u*hnh;seight 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 inst n yh8ve,ab69aantaneous force. The ball hits the bat with an instantaneous force, whose magnit689ynahevab , ude is

State Newton's three r. f)xqp1dc(0)d htram yjd(9 laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon thane11u u.p4twfi on Earth. Which of the following is true about the mass and wf4p eu1t1. iuweight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distay-+-satp b41c6 czrcrshm9 sj.l e43ance is

  Who has a greater weight to mass ratiou*, izrt8nb4 aa;- - 6yywtxbc, a person weighing 400 N or a person weighing 600 ybanxwc z-4i8u-t* 6; r ,yatbN?

  A stone is thrown straight up. At the top ofzow: yf/m3)x t its path, the net force acting on it itfx: zoy/m) 3ws

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heig0rqi t )7mz3wrl*6 gltht. Ignore air resista7mzll 30 )gwr*tt6iqrnce. Compare their accelerations.

  A brick and a feather fall to the earth at their respectg7h mce;1t5 lxive terminal velocities. Which object experiences the greater force oflm;tg1 he7x5c air friction?

  An object of mass m is hanging by a string from the ceil0tp /rjr bkx44s7 mjg5ing of an elevator. The elevator is moving up at constant speekt rb4p45/7gjs 0mrx jd. What is the tension in the string?

  An object of mass m is han)x)4rix 7vw )hdi0x rvging by a string from the ceiling of an elevator. The elevator is mo4ivi70 d ))) hvxrrxwxving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding qir ,45)bezzpk dx7lpu9wf*2on an icy sidewalk is

  It's more difficult to start moving a heamc/b um+7pm+gvy carton from rest than it is to keep pushing it with constant velocity, becausu+gmc /b+mp7 me

  A horizontal force accelerates a box from resnmahp:f y+o jkj*-j( 76giw5it across a horizontal surface (friction is present) at a co7gijmi-p( f n hwjyk+5jo6a*: nstant 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 incd7 /g(ej/ h6 0fpqarpjlined ramp at constant velocity. Thus we can de j70p6paq/d/jgef hr(duce that

  A block of mass M slides down a frictionless plane q(3ua4d g9y jfinclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bly 9faq4(j3 udgock is

  A block of mass M slides down a frictionless planj8ipv i9 )g,sse inclined at an angle q with the horizontal. The normal reac ,8pjsi9isgv)tion force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incl82 /4e0 jsb favwy2lylined at an angle q with the horizontal. The gravitatio82f42yb0s/ea y v lwjlnal force is directed

  Two toy cars (16 kg and 2.0 kg) are relea cu3n3t:mtj ecl:1:v hsed simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being rv c1mh n3l:3:j:tceuteleased.

  An object sits on a frictionless surface. A 16-N force is applied to the objectdt, q1;ktv/ge ph9,yo, o,vh1/e9, ytdt; kgqpand it accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can acce*f :p3 2fkkazilerate from rest to 27 m/s in 7.0 s. What is the average fo*pfi k32fzak :rward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s ie n(f0;pu +eaiw ydz:2n 2.0 s. What is the net force acting on the bf;+ eiywna:up 2z( de0ody?

  An antitank weapon fires a 3.00-kg rocket which acquires a s 9ti8:rsq c3cks; dz+a(c5ododm )/0dciirv:peed of 50.0 m/s after trar :9r5 iozo s+ik/m8cdd(d q)c0 :civt;scd3aveling
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 force that you pusht5z- o47t zz; h*) frhxz7wdmr a 10-kg mass from reszfz*7o;5mtx whtrz -)z4r7hdt,

  What is the mass of a person who weighcznxi1y10o3f:x wx 2bs 110 lb?

  What is the mass of an object that weighs 250 N on the sx0 twl,na/;l aurface of the Earth where the acceleratil0;n w /a,xltaon due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of thc-b/gb1tyhyl u; d8w8zj/sjd-ni d0 (e object on the surface of the Moy -8sj0h 1(ylwd-ijc/utdndzb/g8 ;b on 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. yqtdr 8ha (h f6alx6b*;lhw -/ The Moon's gravity is(-* bhl6 qhdw ryl8;a6a/ fhxt one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends oq9uknxs 0gy ;gd(c7q hqt. ..pf a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope acceleu(k7q9;n . h.cqgt.qpdy0gxsrates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests ont vuf lgw2,4;o a level frictionless surface. A force F acts on the stacktl o;gwfv2, u4, 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 stands on a scale in an elevator. What will the srtc3ki1rfc yn5 j+ -:ocale 1rcjto5r-y c: +k ifn3be reading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an .6qrpr8a+znx mcj,v+f92g c ,bq*znoelevator. If the mass of the person is 60.0 kg and the elevator accelz r8cn qv,6+,9acbxjmopzn + qf* r2.gerates 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 thefd7;) olnwf/2 2n o.nciz4 hel mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration .dfoonn47iwhn2 cf/2l l)ez; of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One fw u2kyn*ls6,u orce has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of ,wsl *6knuu2y 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kl p-b-8z:/cl q5db oljg rests 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 minimum stopping distance if the load is not to slid:l p 85qc-l-o jblz/dbe forward into the cab?

  An object of mass 6000 -qlt uj-i 9- zdhd-vq:nbd8)u kg rests 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 minimum stopping time if the load is not to slide forward into the i- dq)b8dq:9-d-ul- t jnuzhvcab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, wav sb5q3e:wmxh1d:e n 2e kp lb24*u-2kln o;xhat is the magnitude of the acceleration of the system? (Ign 5q a2bu-o3sx; nxb ve:l2he*nk2m 1: p4edlwkore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 rs1 /g(fxzk( fkg and m = 0.40 kg, what is zk/rs( gx1ff(the tension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a boxhfpsq.t8lf8 o rng *+. of books on a smooth horizontal floor with a force of 100 N in a d lrf.po+n 8tg.f8hq *sirection 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 e*ujeq0gj-s -zq qq,6c7-pk t smooth horizontal floor with a force of 100 N in a directionjkqe- js-qpq ,6*cu0t ez7gq- of 37.0e above the horizontal. 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 i kl (lnw7am:1a7h2h be8fw te2s supported by two ropes as shown in Fig. 4-2. What are the tensi78h 2w 17nftheaa :kem(blwl 2ons in the ropes?

  In Fig. 4-2, if the tensi;f d1u0 f :jc:ad*vienons in the ropes are 50 N, what is the mass of the trafficfc 1uif0vja de*; ::nd light?

  Two boxes of masses m and 2m are in contact with each other on a frsy5 rzp54vb,xh .+ek aictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive bz.yeb+av45 krh5 xps,ox?

  Two boxes of masses m an1j;c e7eas glss7td84d 2m are in contact with each other on a frictionless suts7ges4 js ;al8e 7cd1rface. (See Fig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m an jg: -ze , ru*z6qe pjg:bstm(lj/wq00d 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what 6g*wz lmp:bej r(/t0g-ej,s 0uqq:z jis the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a roq)i dqj-5 s xyw-,u)mlpe. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the leu) 5,xysimqq wj d)--lss massive box?

Two boxes are connected by a cnro wx2a)z/l8e*c0hl7ylpz5mj. j . rord running over a pulley as shown in Fig. 4-5. Box I of m8 ar72 l0pce.j.lx /5mzwjhno yr)*lz ass
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 kin g9sjwk)6/ajx,nfz f*etic 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 jsj* w)nk agzf,xf 9/6applied to the box?

  The coefficients of static and kinetic frictions for plastso5mamy sv n*z3:6(qq ic on wood are 0.50 and 0.4n5m m: syaq(qzvs 63*o0,
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 slg-mau11 vw6d ijj20lu ows and comes to a st-wda6vi2 01g lj umu1jop 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 pulled by a 5.0-N force. A 3.01l/yt2qq9dtiyi p kl( 7i /5ds d4s*hr-N friction force retardsi*5q4 ydi1(d9th qsplrs i t27l/ k/yd 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 r/eu/l u0.8;wx pngwz sate 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 10 m/s. It slit8nbzg) 4ou/. ph8hfcdes 50 m on the ice before it stops. What is the coeffp no8hht.g)z/cb fu84icient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 mprbk:f95e 9fbpz *fr5 long. They determine ther5fz9efp :f9r5 bk*bp 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 brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig.; -9,8:hm8opsidml my ac1t md 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. Idstd9 88ip -:c hmammylm1 ,;of 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 Fig. 41)ade-br r .gn-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 coefficient of static friction between n a d.erb1r)-gthe boxes?

  An object is on a frictionless inclined plane. The plane is in0yj1bu*9 rtil clined at an angle of t*ljy 1ir ub90$30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hvlz;d: j5-tp-.hlc d, vrrpz/ lp)-xnill 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 ai0urs (jq+. uq0z,kb0g fxsf 1.u3obengle 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 at an angle d. a pjw;p6fc1of $35^{\circ}$ 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 direct;)ylf; lz3lb wg k,3ahhbkwk9;o7bb- ly down an inclined plane, at a constant velocity of 6.0 m/syfbb gwl;h 3b- lk3a)lbw;ho 7z;k ,k9.
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 do ud8r+ue )x9xzwn 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 down rii3 -4)fxh0lu deus9tkas94a 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.8h:noaw v 3tflag; c69 The cable attached to the log mlo 3nava86 cghw; t:9fakes 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 roughl 7dyxqi36go ; inclined plane tilted at an angle o 7y3 ogl;xq6idf $33.5^{\circ}$ 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 planeop(prfy/ ,og u7h,6xx. 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 friction u fp6ho(,,g7rx y opx/between the object and the plane?