Which of Newton's laws best explains f1 9b xqzx/1wz c-g1j e:uvra1why motorists should buckle-up?

  When you sit on a chair,4:;sh q:w* gqxcbj3d a the resultant force on you is

  In the absence of an external force, a movi-f)ov; vg-ri.kql a 76 /hrke1.ej qrqng object will

  When the rocket engines on the starshisw n:ffrbg1fgnfcp */( *19ktp NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty spsfnfc p1/fg bgk :*ft1w rn*(9ace, the starship will

  A rocket moves through empty spo6j2/ tuj+rzn 5ja8 xxace in a straight line with constant speed. It is far from the gravitational effect of any stjr+8/65ztn oxj ajxu2ar 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 bur8efr93kf(u.uj a;pni7z th- s, facing forward, and you suddenly fall forward. You erf -ku9(r.nhijt;8 f p7az u3can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenou4 w h4b3zc 7/jqyj4lly fall forward as the bus comes to an immediate y/qu z cjhwb j434ol74stop. What force caused you to fall forward?

  A constant net force acts on an object.p sh t/4+ tvp09:nqrxi Describe the motion of the object.

  The acceleration of an oe0i4qcbfx 29qer .ng 5bject is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net f s94 4wrk +*rdm(bqkinorce is applied to mass(49srn4k ibq* r dm+kw 2m, then the acceleration will be

  A net force F acts on a mass mqhscd- m+ 6:hx and produces an acceleration a. What acceleration results if a net force 2mc6:x-hsq +hd F acts on mass 4m?

  If you blow up a balloon, and then release it, thenmwg jc0hr15 wsa i;0kf+ j*9u balloon will fly away. This g*ww hmfj+kn50asu;jc i1r09is an illustration of

  Two cars collide head-on. At euqw. 5,0bcb zjvery 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. This5wqbj,0. ucz b is an example of

  If you exert a force F on an object, the force which the object exel tc8+ nm (p63yp8ewdzrts on you will8lpc8m z 6y+ndept(3w

  Action-reaction forcesfolthgmc 80gw 2+5n +m

  Action-reaction forces are6a* hi-2wkh2 aod pkm;

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the c 0 )l: u-ib(ny:l1zqznsbe6j- uty.kpar. Since j-:i(bu knnuzb.tz)sel0 yp q1 l :6-ya lot of damage is done on the car

  An object of mass m sits on a flat table. The.iwsb-of8 2x2 7nt.dp tz.-lj aqf, kv Earth pulls on this object with force djpn lqfi.vzw.sb xt2o,k-f t72. -a 8mg, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the :q/vo4 qvjlyp( d5n7 yceiling by means of a string. The Earth pulls dd(yno /vyq5q p 7jv:4lownward on the toy 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 instantaneouszl*o p 8 muh.x5n/p)sx force. The ball hits the bat with an instantaneous force, whose magnil*zpx. sph8 )um5o nx/tude is

State Newton's three lawmt-0f9as6q xx e98o;xk wc(ovd m-de0s.

  Mass and weight

  The acceleration due to gravithlu9jz 4l5 ia-e2 j(n xi0ck ic+lc*y3y 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 surfacia( lelzlu iyn*kcxc9+j hcj-4320 i5e, compared to Earth?

  An example of a force which acts at a di o x10cd+hwi zmk( 8;qzu7,snastance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person um; n:hxap2t x7k18 qu;;*kmx4misgk jj9a0xweigmiaqkm* pk 8x 9a0xu:gkjshx1j;n;xtm4 ; 7u2hing 600 N?

  A stone is thrown straight up. At the dd 0zl v33b+kztop of its path, the net force acting on itz z+ d3lb03kdv is

  A 20-N weight and a 5. :+pat* lak+ex0-N weight are dropped simultaneously from the same height. Ignore air resistance. Compare their lapt+*+ak:xe accelerations.

  A brick and a feather fallf.0urr sg2 b.;cz1er i to the earth at their respective terminal velocities. Whic sz fb.r.cr i1;g0eru2h object experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of ant9n: hvaa zq(m.8gk b; elevator. The elevator is moving up at constant speed. What is th;(bm.v9a8gq k nz:htae tension in the string?

  An object of mass m is hanging by a string from the cei ptm07v(x :*k 5(s,ojcqkg xvwling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the ((q*k,ocxjtv m5wv s 7x k0p:gstring?

  The force that keeps you from sliding on an iu lmjhz2y9h,2p6s)h k cy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it is to keep m:o *cn0 v-nwbpushing it with cons wn0cb-: onmv*tant velocity, because

  A horizontal force accelerates a box from restoiaivr;kuc-aez 4 ; 8+ across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, a4a i;a covz8rk ;+uei-nd 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 velocity. Tw z 2omr+of/b5hus we can deducw bo/zmo r2+5fe that

  A block of mass M slides down7cv i4mai *t9wga+u//:9 kz ,bm cdrtj a frictionless plane inclined at an angle q with the horizontal. The normal reactionu: b+c9kr7tdma4c9az *, v/m ji/i gtw force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane incl v 9,4t*pnaxdjined at an angle q with the horizontal. The normal reaction force exj*t,v xna94pderted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at :ky(*7 lierzojalg7 +an angle q with the horizontal. The gravitational force is direct7 yroj7gza(klie :*l+ed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined 75)n6 m;nre y.u3xuod;u*4mzrzyh k qplane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being releaezq ym; 5n hx;)4ukdu* 3r67ouz.mnr ysed.

  An object sits on a frictionless surface. A 16-N force is q*qq -m5me(b kapplied to the object, and it ae5m- *qq( mkbqccelerates 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. Whahgwc4 5ldo1 cb-lq2)it is thhdi-5l1l4wo2 bqcc g) e average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 sct-mxh q h x,2.28yvcd. What is the net force acting on txh .cm q-y 2x2tdc8hv,he body?

  An antitank weapon fires a 3.00-kg rocket which acqui6j1 av0/h4zy bpx-gnv p q)2psres a speed of 50.0 m/s afterx zn 64jhqvvppp)bas/0-y1g 2 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 same force ty9 t kkikxuh6;xiuzet-u/ y1tjv8499hat you push a 10-kg mass from rest,i- 8u;9xk1kxjhtizy/uvtuk e69 yt49

  What is the mass of a person who weighs 110 lb?(hx b6l8yd 3rcn c (v.0sdv/hv

  What is the mass of utnl(f /- u.de9 nqumlt6 ki/b+-drq2 an object that weighs 250 N on the surface of the Earth where the acceleration due to grav2d t(-n/6f-k+q9n/.lu bteuq u rmlid ity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of th3 tv7xq m0e(tm)b 6bhhe object on the surface of the Moon where the accelerationmt6etbm30hv 7x) (bq h due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and obbee/wg gvl+f;ih*-o*/yit g +ject B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the massl+/-gw gbyi/ **hvi+te e ofg;es of the objects.

  Sue and Sean are having a tutpo tmh-b/3g07 nzng9g-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What/ zom0g-t3h pnbt gn79 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 surfaczw:, t ynvy23je. A force F acts on the stack, and 2vy j:ty ,znw3it 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 scp/0ipgt-upf x, ) -ky2uah2ahale in an elevator. What will the scale be reading when the elevator is acceleratuf/gth-2i )k-apy,a u2px0p hing downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60.0 zhc bi 45;fizvy b*0l+kg and the elevator accelerates downwardiv;c 5l0fhbzzib *4 +y with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale ridesd6: piqyznj6;k*y6xg in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acx6:j;6iyd kn p*q yz6gceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-+o8)t x6 /nn*wpdf rlkkg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnituxw8f) rlkt onp/*6n d+de of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a ; v 6 0z-vlsot1n9y9. btoximatruck. 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 l96xt lz -1t0 sov ;n.obmivya9oad is not to slide forward into the cab?

  An object of mass 6000 kg rests on r ql22q4xuqan/ n.hd; 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.u2n a/x 2q dq4lhrqn; cab?

  In the Atwood machine shhb 6u)5 ewqadiamw9. :own in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the m.e5 w dw:uibam6a)hq9ass of the pulley.)

  In the Atwood machin 4r7/)z vlfefoe shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulve/lrf7 fzo 4)ley.)

  A student pulls a box of books on at4g4s4lff7q:-o sn iz smooth horizontal floor with a force of 100 N gqsstfi: 7n-4l4 of4 zin 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 horizontalomxi(a* ;z.mali, yk83y x,bp floor with a force of 100 N in a direction of 37.0e above the horizontal. If th mzi*m,,x (ablyopkx i3y 8a.;e mass of the box and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight(i0 qaow:m ba- cc+ 5kg6zq9ri 100 N is supported by two ropes as shown in Fig. 4-2. :96ba mqqz+g0 wko-ci5cra( iWhat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass o r.bd0bgo8qh4f the traffic light0ogdr qbb84.h?

  Two boxes of masses m and 2m are in contact withp/ 2fcxn. cdl3; /1ak9v4x0sztqupm k each other on a frictionless surface. (See Fig. 4-3.) What is the accea0 ncu /9szdltv k f14 2px/3.xpqk;mcleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eah 2.h 76p6ifu -odzr1ghemt,yd8b up*ch other on a frictionless surface. (See Fig. 4-3.) What is tdpm o6yu- *iu,z gbh712fe.hr t6ph 8dhe net force on the more massive box?

  Two boxes of masses m and 2m are connected bgv5 /u).(jckcqzcr4a t.z r4ky a rope. (See Fig. 4-4.) If the forward force on (zrkjavcq z )4 crktgc5 4/.u.the 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 Fo2 v(p xhz -tjki(s*(tig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the less massi (*xsktj z2 p((t-vihove box?

Two boxes are connected by a cord runni tntagi-vrn(rg*f98 n mn63ec2s,nn /ng over a pulley as shown in Fig. 4-5. Bo/-3rtgs *i ve96nn (t,m nn nn8fra2cgx 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 fri-wd+m)qcw( w+fa8 lcdqn6.w wctions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net+-c.wmddw waf)c 8wqql wn+6( force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plaqu0,t w0aeo b1b cs mjq;37n0dstic on wood are 0.50 and dcn;s a,jqeb ow t3b00m17u 0q0.40,
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 and comes:(7zx4qymmj9 ;*eqwe mdf t5xlb:2 wl to a stop with a constan7:lqwx9 e(jbmzw 2;4 ftd5mlmeyqx *:t 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 sugt ,ujl-m 2cm/))rc8 f/ixboe rface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration oi/8g)2rxmlmu /),ce oft- cj bf the object?

  A horizontal force of 5.0 Nqopm3h p 2,v9n 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 is given an initial speed skl th;+6(ill of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the is;(h6l il+lt kce?

  During the investigation of a traffic accident, police find skid mar dj4 r fq:eep)dt.87urks 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 speedfur :q4.8d7)t rj eped of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sur jmf,m3 -uu-8 t6beejcface between the more massive box and th-bm6tu mj efe8,uc j-3e 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 Fig. 4-6.) The surface .c) z,ja-wz ebbetween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If thew-bajzz e.,c) 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 inclin (s1(bccb xa4.j.bl4fijd9xq ed at an angle b jjxcdf.(49a bx4l 1ic q.bs(of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that 8kpj m 2v(s1khmakes 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 inclinc nj-xw gg1ey 6*m9h x6,4qa)-qllmeaed 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 inclined plane tiltedn/ls8zokkh 1 /*gh1 :k*ttqw q 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 3 41cgp:ygq9id y r;ldcj(nm3 directly down an inclined plane, at a constant velocity of 6.nc1(ydjryl ;q4 pdmg g:9c3 i30 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 ro z+xaal66 ;iycm dlkc g511j3mugh $37^{\circ}$ 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 dof)pa ,ey*sa9, ;d icpawn 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. Tr7.c0 3 dftufohe cable attached to the lo tofuc3d0 .rf7g 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 ,mm+ rqffzi0 k u;e-a-a rough inclined plane tilted at an angle -f0imamr eufq;-+kz ,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 incliuh9 lik+ikn,0ned plane. The angle of incline is gradually increased until the object begins to slide. uin0lhi+ k k,9 The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?