Which of Newton's lae 1hy igh* i 20a/caepyzf3y,6ws best explains why motorists should buckle-up?

  When you sit on a chair, the resultant force on wu1 *2f 1ehzgd+sli++f p;mhayou is

  In the absence of an external force0-d8ak )uv nda3ai z3)pfc)m d, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly m;xn/txz q0kb;e ;c,t )wc8edturned off, while traveling in empty space,zk;cxett/mqn 8;;xbew d 0c), the starship will

  A rocket moves through empty space in a straight tnwk. x(yjm uhm+ /nkz27/7oyline with constant speed. It is far from thjuy7otkn/w+y x(2.m/ 7k zn mhe 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

  You are standing in a moving bus, facing forward, and you sudo6,w9m+b wgtyp x-xx 9denly fall forward. You can imply from this that the b9ogx p-m xx+6b wy,9twus's

  You are standing in a moving bus, facing forward, and you sudd-0g q d/dpfkz tvn73w4enly fall forward as the bus comes to an immediate stop. What force caused you to fall forf-d4ntkpqdv /7z g w03ward?

  A constant net force acts on an object. Describe the motion of the )ty8 a v*mxb8e xke12180/vc whsvtwh object.

  The acceleration of afb +kl+a 3b-j2,xunw rn object is inversely proportional to

  A net force F accelerates a mass m with an acceleration f.p:,0fmz 3ixrw-z r ca. If the same net force is applied t3f,-.z0wrc:mf pi rx zo mass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceler:jo9t9vi3l7pmx t3 vh*w*t yeation results if a net force 2F acjtte** 93ol7 3p9vhmitxy:v wts on mass 4m?

  If you blow up a balloon, and then release it, the ballp4jzm,97 xe t,u *gz 4uoxh1jloon will fly away. This is an illxlz jtu*,x7e uho 4g,9jm 1zp4ustration of

  Two cars collide head-on. At every moment dur.s(2 n zdl b *k1b7u8oljlvz+ying 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 blko 1lv8z (u2sy blnj.z+d7* car exerts on the first. This is an example of

  If you exert a force F on an object,0g -ywyp: g2ci bjl1q7 the force which the object exerts on you willj7y ygbcgqw i1l20- p:

  Action-reaction forcesu)rf, b 79tbr3zbp8k k

  Action-reaction forces arng 6la2m9 pg kb,;w)lf7pkn/m zyd+z9e

  A 20-ton truck collides with a 1500-lb car a1-x 5 6g3 knbpzj(gqksnd causes a lot of damage to the car. Since a lot of damage is donezknspj3bg 1q-xk 5( g6 on the car

  An object of mass m sits on a l 5l.vt 0j j;ob+nr8maflat table. The Earth pulls on this object with force mg, which we will call the action force. What is the rea;8a+5t0 ljvj bnoml.r ction force?

  A child's toy is suspended fra) jug3r8:bt )xf* rauom the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. xa:rbt3j fag*)8)u ruIf this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched tof)yv1 h 7lme:4ixxs-s you with a 1500-N instantaneous force. The ball hits the bat with an instantaneox xl 1)im7h-sy4sv ef:us force, whose magnitude is

State Newton's three :r3atdnm afqyae9 ( 9.laws.

  Mass and weight

  The acceleration due to gravity is lower on4x/ xjf:4 p /uxqz:ijm the Moon than on Earth. Which of the following is true about the mj/fxm:j u/qzi: xx4 p4ass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force wv pl;fwxu -h/35t5j h:mm+mi phich acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400c2v aka6:r1p+ec /lom N or a person weiga1k26ma/ccevp:l+ r ohing 600 N?

  A stone is thrown straight up. At the top of its path, the net k-:c+ut7 u qt im4(wozforce acting on it+4qt uut7ocwikz:m (- is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sbqe7rz,mio;x(.gegk+d,;, u b zcu6 k ame height. Ignore airgq ux,r .um6+zegzi 7d k(,;,boeb;ck resistance. Compare their accelerations.

  A brick and a feather fall to the ear e,aaed *zjy86th at their respective terminal velocities. Which object experiences ae6ay z8j,* dethe greater force of air friction?

  An object of mass m is hanging by a string from the cejgnnw8)t-f2ty7k h(s 1dg3t 7t(yqw eiling of an elevator. The elevator is moving up at constant speed. What is the tension ieng 371 q y-y(k2f(t htdtjnsw7)8twgn the string?

  An object of mass m is hanging by 3 rsry2 pfxx* xip0*pol8/6f/g ig,m ja string from the ceiling of an elevator. The elevatomo/3*xgy6 p ,xflipis 80pg/* r2fxrjr is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you from sliding 4) k9p6s fgmaion an icy sidewalk is

  It's more difficult to s-bw)6z/ 9zawvvvj s+x,rx l7 vtart moving a heavy carton from rest than it is to keep puvw7 9bazsxr w+ z,)/v l6vj-vxshing it with constant velocity, because

  A horizontal force accelerates a box from rest across a hori;ho93 gnnvx h1zontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the 9nvgx n;ho3h1 horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity2q ;*jootsm6l. Thus we can deduce thaq *2lsooj;m6t t

  A block of mass M slides down a frictionless pla2ag0,z :xrpf pne inclined at an angle q with the horizogf 0pprx:,2a zntal. The normal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at avv s5.r, p;mlcn angle q with the horizontal. The normal reaction force exerted by the plane on the block is cp;m.v,5rs l vdirected

  A block of mass M slides down a frictionless plane in1y4pub 6f5l:ljvk 2 3e:trznwclined at an angle q with the horizontal. The gravitatu:r4l5tz6b y n 1kepv3:jf wl2ional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneousl n5rotsye5reo y+sb)p; 3f c(9y on an inclined plane that makes an angle of 30e with the horizontal. Make a statement whon ps)+;yesyrr3c5 e(f 5b9o tich best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is apcxowi0( m3(af,7 qj)mwx-rzf plied to the object, and it acceleratesajc mr0ximz7)q(wx- ,o ( 3ffw 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. Wha 0zs+q 7mzxb9qxwfw 4,t is the average forward forbfx 7+ z,wsxqw4z90qm ce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Whatff ix82 2cz,bi5zxex8 is the net force5i8bfc2zf, xxez28x i acting on the body?

  An antitank weapon fires a xcgdv0qjk )s+j +3--pox, hqn3.00-kg rocket which acquires a speed of 50.0 m/s aftepgqx xj -n)+3 qdoh-jc0k+v ,sr 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 that you push a 10-: 7s9ulms*u mykg mass from reu mly*u7 sms:9st,

  What is the mass of a person who (f4rc* 8cegp 5eqa0kzg sga +)weighs 110 lb?

  What is the mass of an object that weighs 250 N on the 8t(c jhf ft-hd 5ql7ghcui , m4:j,(g.dv8umpsurface of the Earth where the acceleration due to grav5(4 jq ch8. fhldvp:u8c-(,m ditm,guthgj7fity is $9.80 \; m/s^2$?

  An object has a mass ov dvfn,+c,(f of 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of that on thedf, ,(covfn+v Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on thkem19h u frr98qztp48 e Moon. The Moon's grf9zmp4t1ku8 er9qr8havity is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a t1w - f3z0uqmj,(jt ollug-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 ropjlfo(1,0 q tj3luzw- me accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rest(l93sh* cw loks on a level frictionless surface. A force F acts on the stack, kchos*( lw93 land 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 -u1ncy3.av0t )*y b vrlag86ru.judielevator. What will the scale be reading when the elevator is acceletyvr8 nc6ibjg 1.)vu-lad .ry3*0uu a rating downward at $4.00 \; m/s^2$?

  A person on a scale rides nh1h 97o1fzk1o o,gdk in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an a kog1,h171dzfn o kho9cceleration 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/bli u4+ /hn8-uabz vq3s/p ea 60.0 kg and theh /l -v+u3e4qbz/pin/sa8u ba elevator 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-kg mass. One force has a magnii5vt9z*qo .bnnetypd/z9z f6.. tor7tude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. W zp.rten / ifz6.o97dovzn9.bt *yq t5hat is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held i*r(mg(zr b5 vln place by metal brackets that can exertrb 5lvm(g z*(r 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 6000ouk+r7k7ka;* dyr a-d25 uubp 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 lo dur;* ku+7p -5u2orkydaka7b ad 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.lf4v l m yf:,.yhl.-sa40 kg, what is the magnitude of thela fs vyll-f.h .m4:,y acceleration 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 9w6 l 3o1hfxi2;)kb fq9kuxkwand m = 0.40 kg, what is the tension in the string? (Ignore frictiluk; 1 i)x 392xq6f9 kkbwfwohon and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal fl9mn,1 mxu w5ftoor with a force of 100 N in a directwumt9 xn 1,f5mion 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 8xk(ont9kqz d l3zj d4z45g+nwith a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the b l oj(qz n38z+dxkzg 5n9ktd44ox and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supporc(b3i bcncsqgzuj . .:anj28vk*3c3 wted by two ropes as shown in Fig. 4-2. What are the tensions in t *j33abcb 3nkuc.wi8.z(nvq s :jcgc2 he ropes?

  In Fig. 4-2, if the tensions in the ropes are 5m3+w+ /j6nvgffyc4g t+sga5y0 N, what is the mass of the traffic lighggs+w fn ay+m vcg3jt6y/+f45t?

  Two boxes of masses m and 2m are in contact with eachjf+f3x 88sapj other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massivefax+p88 3j jfs box?

  Two boxes of masses m and 2m are in contact with each other on ak.hy 9xk uv9,b frictionless surface. (See Fig. 4-3.) What is the net force on the more massivek.ybvx9 ku 9,h box?

  Two boxes of masses mt*y2cz:gq9 hy and 2m are connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connez9y*hyc t: gq2cting rope?

  Two boxes of masses m and 2m are connectvb6*ypei z/ .bed by a rope. (See Fig. 4-4.) If the forward force o*iy b6ep/v.zb n the more massive box is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pzu(1 v( p7 .itnv5mgtx/4lvpvulley as shown in Fig. 4-5. Bvit( v7 pg14x ut(n5. vp/lmzvox 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 staticsg5h/z /l;knx1-1 tywnab)ik and kinetic frictions between a 3.0-kg box and a desk are 0n1bl/gz-/yw a)s1k ;h5ntkix .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 kinetic frictfvn(ord h9szh +:o l5,ok-.p,.qqn7jz9s h ztions for plastic on wood are 0.50 and 0.4(,nhho q- zdh5f9p9+qrzvool: .st7k j, zns.0,
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 ih: ayi 657cmaslows and comes to a stop with a constant acce7c6: mia5y ahileration 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 9awa v;q3sf r/a 5.0-N force. A 3.0-N friction force retards the motion. What is the accelerati;a f as/v3wqr9on of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rat(uor/z ;.hy0ps3v wgc-kmy9w e 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 speo89z8ik/qnb9 j.vqz eed of 10 m/s. It slides 50 m on the ice bez9q/inzj9ev qb 88.kofore it stops. What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accid 5aef/9z;ciotl4 tllxc7.uj 2ent, police 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 speed of th5.ltlcf uix7c2j9o4 ea/;ztl e car when the brakes were applied.

  Two boxes of masses m and 3m are sta7is ue/c2rs up9ffq0c 5n *+qncked. (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 fuq2f/ sr0n+cucs5e9 *ni 7qpdoes 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.) Th .:bov 2ibbt q ieqy.;e9k2m/r oz(r;ie 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 9o . bi2 . o2r(:qvmeq;iyreib zbt;k/coefficient of static friction between the boxes?

  An object is on a fricf :9ul/,yx+y fboc )b2ics6k ftionless inclined plane. The plane is inclined at an angle ofx)6,lfbkc /+yi92 c:yffbu so $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of rfg1;p a1s ecj4du7n 6$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a;eoy+( 6h5sddpfocd3x 2ae1 h smooth inclined 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 plan0 y u 98hn0y.bcavt/ybd8of(xe 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 direc- m b,mvpvov z*1t)-bwtly down an inclined plane, at a constant velocity of 6.0 m/m-m -zpovt )bwv,*v b1s.
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) *a beafq6nz) c g,b+jaf5vj+-nwu1x 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 a r/xmyfaew72 h 4 i,dn2mough $37^{\circ}$ 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 rough1 *2o hfd2qpr5ceb 7ur surface. The cable attached to the lbofd*pcr52 re21u h7qog 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 relm(m em)of74lo4zbvy5*: moa zeased from rest on a rough inclined plane tilted at an angle ofb m5oz4 zmle*:v4o() omy7fa m $33.5^{\circ}$ 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 ow7*ii iv8j3 v/i (5owsv t 0wum,sftrpz+28uqn an inclined plane. The angle of incline is gradually increased until the object begins to slide. The angle at which q z2i+ivjrsuop(i*8 0 ,wmtvv w7t85wsf3i/uthis occurs is q. What is the coefficient of static friction between the object and the plane?