Which of Newton's laws best explains why motorists sh mxg9yp0 v88repo l89eould buckle-up?

  When you sit on a chair, the resultant force on yo(iv dkly ud3 bl)-6(ecu is

  In the absence of an external force, a moving object *ljnsuq5p w-ukt4e rp)9 w-8kwill

  When the rocket engines on the starship NO-PAIN-NO-GA. xamo3izt1 k)p-m1q dIN are suddenly turned off, while traveling in empty space, the starship wt - 3m.mizpo)q1kax1dill

  A rocket moves through empty space abskm9q4e t:hy u(95 rin a straight line with 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 e( qhyaks9r :4m5tu9brocket in order to sustain its motion is

  You are standing in a moving bus; fsr8j y9zc.d39tx re, facing forward, and you suddenly fall forward. You 8c.tfr;s3 de9 yjz9xr can imply from this that the bus's

  You are standing in a moving bus, facing foeaa(2 ao;- 2h0gnbb kzrward, and you suddenly fall forward as the bus comes to an iz0bo( ;-ehkan22a gba mmediate stop. What force caused you to fall forward?

  A constant net force acts on an objec l7m )q:lxasv-t. Describe the motion of the object.

  The acceleration of an object is invewda 38-1iash-zysp f)rsely proportional to

  A net force F accelerates a mass m with an accelerationqomzb6, uc2+o a. If the same net force is applied to mass 2m, then the acceleration willb+,oz2u oc6qm be

  A net force F acts on a mass m and producs+ r2hoek+o; xf, e:kyes an acceleration a. What acceleration resul,ho;s+:r2 e keykxf+ ots if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the ballok(n 3nwr7 whqv y0wd c57z4z6aon will fly away. This is a 6zcw5 kz07nq3w7ra hd( 4nywvn illustration of

  Two cars collide head-on. At every moment during the collisi3dwwt9): c kq4qhzqi8on, the magnitude of the fo k9q8 wdqz3tq4c:iwh)rce the first car exerts on the second is exactly equal 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 9u z/h+ 7gqwm)6jfeznobject exerts on you wi 7f/zq)j6 hguwez +n9mll

  Action-reaction force(g;piqcb)p( mx7,x bhs

  Action-reaction forces ;sr-m5ij 4 awware

  A 20-ton truck collides with a 1500-lb car and causes a lot of damag 92 t)n 8dpxq3huxsv*qe to the car. Since a lot of damage is d xt3)sxn2vqq 8*phu d9one on the car

  An object of mass m sits on a f,mjrp ursa2 5(9ef7bx lat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?s57rmeax2 ,u rp9bf(j

  A child's toy is suspended from the ceiling by means of a string. Thoqa*nwme d8hh4a+4 + be Earth pulls downward on the toy with its weight force of 8. aoh+* mw4q4 +dbna8he0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N ins*u6zkjtnt2 20 du6-bqzb( kxetantaneous force. The ball hi-nj(k6texz uq*bz 2dt062 bukts the bat with an instantaneous force, whose magnitude is

State Newton's three laws.qe679 aoezq .pi* mf7q

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of towo9k.:2lgh; d sv5.4 wddgvm he following is true about the mass and weight of an astronaut on the Moon's surface, co hoslmgdkd 59ovd .g.;w42: wvmpared to Earth?

  An example of a force which acts at a yza ro7)ka1b *dq p-ji)z9kx+distance is

  Who has a greater weight to mass rat6jfes0g0*v t+,:dezskhk amej-g+ 7 iio, a person weighing 400 N or a person weighi7sjv, 0*ed +fez:+a60 gstkij- gkhmeng 600 N?

  A stone is thrown straight up. At the top of its path, the nk(tqz(6yq iw ;et force acting on it i ytwqiq; k6(z(s

  A 20-N weight and a 5.0-N weight are dropped simultaneously frssrwu (u+z35gzt mi jh)qi 1j,4 nd8:rom the same height. Ignore air resistance. Compare their acce8 5sr rw(z : jutz)q4g,1nsujm3idh i+lerations.

  A brick and a feather fall to the earth at their respective terminal vel-u9t6vgjc3)w5 b msujocities. Which object sw9g tc3j-u )mvu5b6 jexperiences the greater force of air friction?

  An object of mass m is hanging by a string z9z2ioja1v8 r from the ceiling of an elevator. The elevator is moving up at constant speoz vrj2 iz1a89ed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an nm+5p16sit yz elevator. The elevator is moving upward, but slowinin5t1+psyz 6m g down. What is the tension in the string?

  The force that keeps you fromp50 i+ ;0jm cjygw2mfo )c(scxh7tb)f sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton from rest than it isco 02zre w+bsr.zbfs3z7+pn3zo v 9 c/ to keep pushing it with constant velocity,2 op +.czzcv0sorzb33/79 +nsbwfer z because

  A horizontal force accelerates a box from rest across a horizontal su::s k79ed9ykv(g8pd v)qsqhhrface (friction is present) at a constant rate. The experiment is repeated, and all condves 8qg ds(p97v ydh:kh):9kqitions 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. Thusx g- a6w35zk)kel rp0h we can d e3zwr -0hk5 k6xlp)ageduce that

  A block of mass M slides down a frictionless plane inclined yk62 fdeqh7k o r*34wbat an angle q with the horizon6kr hq4 2ye wodkf3*b7tal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at an angle qhsqmy .ht y)xfmg t; ga0;+(0e with the horizontal. The normal reaction force exerted by the p+ye hqx;t;g mahf0. )mystg(0 lane on the block is directed

  A block of mass M slided5d,)i x d2fltq8mjn4 s down a frictionless plane inclined at an angle q with the horizontal),d xq82dl i4njt5mdf. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an-7m +7kutayxy inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceluty k7+7-axmy eration after being released.

  An object sits on a frictionless surface. A 16-N for,tx)xn f e .l;gu84kvice is applied to the object, and it accelerates a)n 8exu,g4v;kftilx . t $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7 ozjx t d1ac4vb4l:d7,.0 s. What is the average forward force on the ca ja1x7dc,ot4vl z4:bdr?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/ aq; vg*ci2 ym.xy5ad0s in 2.0 s. What is the net5vay dy2c*qx.g0 i; am force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/sjscvr74): ;hpr*sm ab after travel4 hr : abs)jsc;r7*vmping
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 sameic)xw2e-g2xbzx w*m , )ub 0zdn.6emu force that you push a 10-kg mass from rez-ux ugx inec x2 ,.w)0*bzd6)we 2bmmst,

  What is the mass of a person who witn80tke0 7c 02egdhgeighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eartu 95tpzuc o8ll nv.m5+:bg8mt h where thel c98uo5 g+n .l bp8:vtzmtu5m acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass w gj;j7 g9oxce5f,ss-k/:q ehof the object on the surface of the Moon where the accel gc79ow,j5j :eg-e/fxs;kq hseration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B g0 y+g)zjh 3og5o)oxe1(ueys weighs 40 N on the Moon. The Moon's gravity is on1ho)o gx e35sy+eyjg0u )goz( e sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposf1cyksf h3kn6 sm-m/-i/9 wrmite ends of a 5.0-kg rope. Sue pulls with a 15-Nick/f6rmf -s y19km3wsh n-/m force. What 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 sur8ob4suff58z tface. A force F acts on the stack, and it accelerates at uztf84f 8so5b $3.0 \; m/s^2$. 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 ;vl;)lrpihb7)m, vygstands on a scale in an elevator. What will the scale be rp7i;rm )h)lgvy,;bvleading when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides i;qm +o4e0qywkl pi07m n an elevator. If the mass of the person is 60.0 kg andwy i ;q00kloq+m7mp 4e the elevator accelerates 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 the mass of the pe0w 3*ns97b gqdxs mii3rson is 60.0 kg and the elevator accelerates upward with idb 7 s0iwsnm93qxg*3 an acceleration 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 has a magn11khy6 /yl) nuirlld :itude 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 accey6yu k 1:rhni/d1l ll)leration of the mass?

  An object of mass 6000 jx+x3vq/eq5 z4vwf26v,h km v kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of ,j +v/zw vx3hxe6q5fv2m kq v49000 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 6007pf,ewuq *1wdq q)-jh0 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 isew )q7dpu- ,1jw*hqfq 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, what i1to4gi9q0 /ds3gh d-x8 ohmxi s the magnitude of the accelerationd1 s4h-g q/xiim to8x3h09odg of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m =qk -ym2pp+q b1 0.40 kg, what is the qbq-+ 2ky m1pptension in the string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a force ofre o3h:su7;j/p c2rqxa 4ryd; 100 N inax;s d7 o;reryj/pu243:qhcr 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 force of 10 v+kkuu rd,sw),en5t40 N in a direction of 37.0e aboveu k+dt,)4rus, vk5nwe 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 is supported bys qy* klmp* 35t+duo7floyk6, two ropes as shown in Fig. 4-2. What are the tens*6squ +3,ydo*7ltf mkyokl p5ions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of )jw+b(zac jz (the traffic light( jc+z)b (jwza?

  Two boxes of masses m and 2m are in contact with each other on a frict; a4ah8n r9; ch6jzoybionless surface. (See Fig. 4-3.) What is the acceleration of 9 zyjabrhh64oa n; c8;the more massive box?

  Two boxes of masses m and52hvxeie 8:f d 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force58hx fi:ee2dv on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4jufi/4b 7 k/1-tuanvu-4.) If the forward force on the moreu/ k1nti/uaf74v u-bj massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 244h3vcu8u q3tavpp 1 gm are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the les1 ap3g8uh 4vt3p4vcuqs massive box?

Two boxes are connected by a cord running over a pulley as shbu: tc6a *gwl m3(hz/qown in Fig. 4-5. Box I of mb(q ct :wm3uglz ah6/*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 kinetic frictions between a 3.0-kg box too*-y*9gl-x se:9dgwbvd3 f and a desk are 0.40 and 0.30* es* o9 -vdbg xl:f9dgo3wty-, 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 kinetic frictionsqy3w,g3gj9 sd for plastic on wood are 0.50 and 0.40yq,wsgjgd 33 9,
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 p 1-rung)(nuccomes to a stop with a const (nncgp )1-uurant 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 surfal jkvb(hwml(yh6; /7pnb*iu: ce is pulled by a 5.0-N force. A 3.0-N friction force ret7u/p y (;m *inwhbj6l:lh(bkv ards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, :cgd/plbp d be x1m5v.i-o40oat 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 of 10 m/s. It slidew +h 7rthb+r *)hc-ovks 50 m on the ice before it stops. What is the coefficient of kinetic friction bot-h+v hk7crh )*+rwbetween the puck and the ice?

  During the investigation of a traffic accident, pobj8pa *zyquz6gt .+s6 lice find skid marks 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 spezba6q+.6 jt zupg8sy*ed of the car when the brakes were applied.

  Two boxes of masses m and 3co tsa*l y/ 7 -jgbjew/9f7rsxr g(6)hm are 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 static friction force on the less massiv-asx/bcw *t 7eg6/y o gl sfrj(jr9)h7e box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sbd89tsj- cg08 a3 g3mrbm0 tzas0se,dv: v8 igurface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less mass ge,gd9ar:sb tms80-zi3g8vv c3b d sjtm8a00 ive 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 inclined n3q(w b:f7 tbkat an angle ofnqbktwb7 ( 3:f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of p7 *4*0t ;j fei6+lv claqhlkoc( 1fvr$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plane n*r/ gky(ww7jwith 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 til5 xijv k(2,piated 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 inclined planx:fo5kw h8 iu2e, at a constant velocity of 6.0 :w58okfihu2x 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 slideww5m.n+. /rwe+m u.kev-dvpw s 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 mass m sll:e (p 2ek1oy/+ienmn.zw(t(pi.l vuides 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 weighinh4z9 nvda36/jca 1tt 5yyvc x6g 500 N along a rough surface. The cable attached to the log makes an anglenax6y9czvj1dhv t c3 y4a5t6/ 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 tilted at an f/gir )z1 7ksgmkr-s* anglesm1fg k/* gr)sr k7-zi 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 oz4qb**jek a)x 2e *ubdn an inclined plane. 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 between the objectq*buej * 4ke2 )a*xdbz and the plane?