Which of Newton's laws best explains why motorists should bs ow 8jy2.dwf4uckle-up?

  When you sit on a chair, the resultant force on yo-1v v5s1j hq9*ddh6pi8l kct uu is

  In the absence of an external force, a moving/193oyy83bkusxaq03(utv ltmh 8w o nqe;k n8 object will

  When the rocket engines on the starship NO-PAIN-NO-x83py,,q oz cm ,fh,xlGAIN are suddenly turned off, while traveling in empty space, t,l ,zmpqxc38x, o,yhfhe starship will

  A rocket moves through empty space in a straight line with constant scwf xx i 4nwo-*;z0ou1peed. It is far from the gravitational 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 xx;iow wuo 1nf4*c-0z

  You are standing in a moving bus1/ )ojihotxf qi:45zd , facing forward, and you suddenly fall forward. You can imply from th:ijo5z 4 ithqfx)1 /dois that the bus's

  You are standing in a mov(h/sg*g*gy1gw tr z5hing bus, facing forward, and you suddenly fall forward as the bus comes to an immediategth5 s/h(ry*w gz*1g g stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of t gnn* 6hs-2eiohe object.

  The acceleration of an objecs. s ooemhje. a18z ejv.h::+ct is inversely proportional to

  A net force F accelerates a mass m with an acce l3ug .p9bh6fxlo4n j(leration a. If the same net force is applied to mau4xh6lpn ljg 9fb(3. oss 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. Wh*bs5o xm /a j-h 9-g5bdxjx9xaat acceleration results if a net force 2F acts on mass 4 xhxb dao/mg5 -sx*jj9ax 5-b9m?

  If you blow up a balhyxiwqcir8y ; t 345d4loon, and then release it, the balloon will fly away. This is an illu;h48q53di y x irw4yctstration of

  Two cars collide head-on. At every momentkidx fz (qq ;4yrljn/ prz*)59 during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of tfq*(4ziq rn 59)p yl;dzrkjx/he 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 exerts on you wivp6 poo85n7ymjca4 ,r 6nj8p7 4ovc5oy m,arpll

  Action-reaction force/b fwud mc,/w(uwp85 js

  Action-reaction forces w ( ,(uef26a,)cl vf*lnh sz*jc5ze8 vj7iflr are

  A 20-ton truck collides with a 1500-lb car and causes*lwo nw d,g hbig8z1p l1 n:f5+bnb:,f a lot of damage to the car. Since a lot of damage izi8o* :d,n:hgpn ll51nfbw,b f+1bgws done on the car

  An object of mass m sits on a flat table. The Earth pulls on this object withh,kl ap bo kis*.bu1.; force mg, whic,s lu.;hbki1 p.abo k*h we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceilic t*en(39p-slluo(f b ng 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 "reaup*3c-(fle9nlto (s b ction force"?

  Your bat hits the ball pitched to you witwoebqs78 ijid// mzc0 sd3;l 3h a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude i s83ei7jc0 sdz3oqw/ i;db/mls

State Newton's three *wn ke:1*loqok/i jhgr: ya4 3bfj2r9laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Eartn cqpwzm87-*e z5 ;sbmhp vz;1h. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth51vmppshzqb;*; 7-wmce8zn z ?

  An example of a force which acts at a dihfg)a2;. qez6 mb/ etustance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person wthc5 n n7si8ewrk36z5 p;ky;qeigh5ksiy w; p t6cn eh;5qrz387kning 600 N?

  A stone is thrown straight up. Ax*///x:x gxfilp4)fjzx tt g9:bi,j qzs */p ft the top of its path, the net force acting on zjf/pqz/j9, gix: xixl:*) f*4 bxp sxgf/t/tit is

  A 20-N weight and a 5.0-N weight are dropped simultaneousl4 381 la.bk8ooftfocr x.(pgqy from the same height. Ignore f t.p8qfo o rx1bk(834l.ocgaair resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respectivdt :+5efrwg 4*,xe shee terminal velocities. Which object experiences the greater force of:+xd4 se5ree g,h w*ft air friction?

  An object of mass m is hanging by a strinh jy3avy1)( 7gjk je)vg from the ceiling of an elevator. The elevator is moving up at co a7g)v)1(kjy je 3yjvhnstant speed. What is the tension in the string?

  An object of mass m is hangz ucw3a53s8v bing by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the strin83 acv u3ws5zbg?

  The force that keeps you from )oibj g5(g*e xh 9zr/l3l rq2hsliding on an icy sidewalk is

  It's more difficult to start mouv de0b2o (xpe4 p(b-bving a heavy carton from rest than it is to keep pushing itbdppoe 4ebbx-vu (2 (0 with constant velocity, because

  A horizontal force accelerates a box fro .x6 jxtq*e4dom rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeaqxjox*t4de6 . ted, 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 ve,nz 87e: 9m 1d8ay6w uyary2m6ooozuprg 4h *alocity. Thus we can deduce emuyaa4z86 7wuoaz61,2 mg hyo:o9 dr*y 8pnr that

  A block of mass M slidy c 8qmdx6.p.wes down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blo8ymw. .q 6xdpcck is

  A block of mass M slides dmw2/th r rcbne b3yzxas:--8+own a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on tt/er:b mn 2r+3zs- cxhwba8y-he block is directed

  A block of mass M slides down a fric(n2 zabwj : 8)qo(mhihtionless plane inclined at an angle q with the horizontal. The gravitational force is dire oniwj :b(8qmhz)(h2a cted

  Two toy cars (16 kg and 2.0 kg) are released simul65 al/sp0 ewli11 er6b;bjp ar.) xfsrtaneously on an inclined plane that makes an angle of 30e with the /jlbse5rr1.f0x61)irpae;w bsap l6horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to th30( ppcdnjea* (k*o zme object, and it acce zn(3 0dep ac*om(pj*klerates 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 l +8c3d*u 9xsc-t a(f lhoz8wrm/s in 7.0 s. What is the average forward forfo3hl sr+caz 98lwx*tu(- 8cdce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s, 1u;. lnwg y) *k:ju gnxp-4rr0j3 egzbvqn.g in 2.0 s. What is the net force acting oyr.ew u4gjn 3p jk-.gb:*un;zrxn1vg )g,q l0n the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed c5e) :d fgijad/m6z.d of 50.0 m/s after travelin5cagji6 fd ez).dm:/d g
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 pbt+3*m mj-tp;,jhzeg ush a 10-kg mass from resp jzb;mtm*3+j,-eg th t,

  What is the mass of a person who weighs *02l- 6othkmsmcc;ph 110 lb?

  What is the mass of an object that weighs 2byugpo4ma+8x.0 * q yz3*k0ria +isf qy,.gdm50 N on the surface of the Earth where the acceleration d 4 rps. mk*8xao dg,b*iiyfq aqu +z.3m0+yg0yue to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the ob xdt7jo*pgh5 )vzd( h 50d eg0j*(zsnnject on the surface of the Moon where the acceleration due to gravity is only 1/6 of th zd0t*nj0hgp en5z gjxod(h7v )(d*5s at on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N i ja;6iq:erxwe )+ut4on the Moon. The Moon's gravitywjti 4uia ;:eq6)x+er is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tugi pum0ah1wzl;q :eb,f 0z,z5x -of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the r ,10pb5 ;,z0fil hx am:qzuzweope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force 1tsamcre6.xc m +l.x4 F acts on the stack, and it accelerates acx 4xlra c6+. 1.tmsmet $3.0 \; m/s^2$. 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 zw65ql ntbimsju6-jh8st(-5 in an elevator. What will the scale be reading when the5 uz86jb6(jt5snti -l-hm swq elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of thelt uv1n n8e5v-8ogp3 wf4ue p. person is 60.0 kg and the elevator accelerates downward withgwnn1 t3u8- vvope.u8ep lf45 an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. Ift( cuiw9l9 cpuqni m/sf1sj24j,d 7j2 the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration of 9siuj,ni/muc1spjt9w 2f( l 7 42dcqj$4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One fcfnulp- 8( 5ewajhk+-q q+ge:orce has a magnitude of 8.0 N and is directed due north. The second force toward the east has kq(8leu p:w+g-jnf h eaqc+-5 a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbe3rfrnoy6 3xp 3r+de o2xtq 0rl4*7nvbd of a truck. It is held in place by metal bracketne 3+prr3rto2dq60orxf 7 4bxyn*l v3 s 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 rests on the flatbed of i d65haopq+p7 a truck. It is held in place by metal brackets that can exert a maximum hora7+i6hdo pp 5qizontal 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 cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, wr1v0 ajlhysuccf9-9glv37 9lhat is the magnitude of the acceleration of the system? 01 vcsalugflr7yvh-9lj 39 9c(Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 xg;/ew3yux :/ ck6tg gkg, what is the tension in the string? (Ignore friction and the mass of the /ggk t6wey 3cux/:gx;pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force o q m3t)ku3un)qf 100 N iq nm)u)u3tk3 qn 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 horizr ,que1y irt2;4fxq9 x d+vzd(ontal floor with a force of 100 N in a direction of 37.0e above thf4rzqrudx2y v+, (d;91tx qeie 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 1q7 /qsi+() -j6i)5ys edqxwhud /zrrh00 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rop7 i(s 6he/-dr/ 5) ixqzryqhdjq)sw+ues?

  In Fig. 4-2, if the tensions in the ro f 5tu3aj/5kjspes are 50 N, what is the mass of the trafft3/5u js f5ajkic light?

  Two boxes of masses m and 2m are in contact with eac pg*6m3/nn(b568z3sfagjo:m g ycqzdht 9k n 5h other on a frictionless surface. (See Fig. 4-3.) Whanb*6(kzh:zq5tnfj3yggng /635m p 9s8d caomt is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contar ww-vejq0 a6z0tn*g*ct with each other on a frictionless surface. (See a0w6 grj znv0e*- *qwtFig. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope/0yn*fp ac1 ome j(o5x. (See Fig. 4-4.) If the forward force on the more massive box is F, what is p /5oecx( j 0afny*1mothe tension in the connecting rope?

  Two boxes of masses m and 2m are connectexc 4 9-2mgsibqu 1muxs/(r/ea d by a rope. (See Fig. 4-4.) If the forward force on the moreucb24 r9ig1/uex ax s m/q(sm- massive box is F, what is the acceleration of the less massive box?

Two boxes are connected.c: 6jdu1r2i et wx*b.el1cba by a cord running over a pulley as shown in Fig. 4-5. Box I of massbe1x.*1drlb 2: 6 accwtu i.ej
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 a,k rvwr0 ; wpd1;nglr: ig1id-nd kinetic frictions between a 3.0-kg box and a desk are 0nl1i0d;;k g 1:vwird w gr-,rp.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinet zok,4e,u b4,4(vhwd b epunim5w,bb6l0 ze-kic frictions for plastic on wood are 0.50 and 0eudw , 64pkv4 ,40zbb-ehzl,ou e(5m bbiwkn,.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 direct/. b0w) bnhtvpnbj3r *ds-9a tion. It slows and comes to a stop with a constant acceler3b npvw.n)t sd b9bja/0*h tr-ation 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 horizontaor4l +qi53 o5pwmzzg 1ab q--+kz o*ail surface is pulled by a 5.0-N force. A 3.0-N fricti b+lo5zi zw aa4k*g qoim1-+r 5-3oqpzon force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg wa4z3jb56agg 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 spe6n;)q3ljn2 y:qce0 hlmbggeu :5 vr 5eed of 10 m/s. It slides 50 m on the ice before it stops. What is thl:5m6rnjbu32eg el;c :q )0 qnehgyv5e coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic wxr,l7d.v w(qa 1j4r faccident, police find skid marks 90.0 m long. They determine the coefficient of fjx 1.,rw4aq w7f(dvrl riction 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. (Sqx d u*m1f)5 bemoi-9yee Fig. 4-6.) The surface between the more massive bob915oi xfm- qe* duym)x 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 static friction force on the less massive box?

  Two boxes of masses m and 3m are stach8htcj,7 5vp.d mezk k 1ol;i/ked. (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 lel e/iok 7mjcthpdzvh5k,;8. 1 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 pla.7 /;nzt d qwvkuu224imx9 9ld9s pkpjne. The plane is inclined at an angle.ptw q 7zjp; vun lmd42s9i9dk29 /kxu of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makesame .h5o,-tl,hwr-f r 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 dzazla u0v;..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 tilted aaeyh b j w5xp /7ua*2u)ae*k6jt 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 pl0(yvrpu hnoz9uk, o) , )n.ookane, at a constant velocity of 6.0 m/s)h(rk9unn,yo ov k .) p,zouo0.
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 sl wh 9 sto;svv8p)nr27lides down 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 masbj no 8m7z(sq 1 6;hyasj5,hgrs m slides 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. d5)yld7yv2 lf69ck5v o,y agd8 n2bhuThe cable attached to the log makes an angley6 hof2)d25 lyvdk ba y5u7n9d8,cgvl 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 l2/xb1 4hc esyinclined plane tilted at an angle of /1 bsx4hy2le c$33.5^{\circ}$ 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. The angle of incline is gradifkuiu(z8vn +)l ,4qrually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of s+)k(inq4vi ruf8,luz tatic friction between the object and the plane?