Which of Newton's laws best explains why motorists shoulaer, lyfid1 +;d buckle-up?

  When you sit on a ch*xx mzz++zmzo(d lk-mul4 : 8vair, the resultant force on you is

  In the absence of an external forcerswsp,kimw 76tu iii dz8xws u1al49150s p9*, a moving object will

  When the rocket engines on the starshipk, fzi,.zn e9i NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, thezkz 9ie,.,nf i starship will

  A rocket moves through empty space in a straight line with consuw)m(1d k 7rfetant speed. 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 (7udemk1w f)r sustain its motion is

  You are standing in a moving buz/v h+*jh.t hqs, facing forward, and you suddenly fall forward. You can imply from this that tj / hh+thzqv*.he bus's

  You are standing in a moving bus, facing forward, and you suddenly fall f hjic;g3sc/sm:ddzdq.2x * v+b o i5a6orward as the bus comes to an immediate stop. What force ca+x3sz2iv dsoc/ :6i . gcjhb;q5*dad mused you to fall forward?

  A constant net force acts on an object. Describe the motion of the op vz2il7n,q9no b.r-8dh iz+lbject.

  The acceleration of an object is inversely proportionn4a9* 3usgbn rpv:cc uaf:f;0 al to

  A net force F acceleratest-ngx9/(9 .ucaqe fw*x o9 ncx a mass m with an acceleration a. If the same net force is applied to mass 2m, then the accel 9 /*q9u.tgenx (wxc9anfc-xoeration will be

  A net force F acts on a mass m and produces an accel u*wlq;awv5(heration a. What acceleration results if a net force 2F acts on mau 5vwawqh(l* ;ss 4m?

  If you blow up a balloon, and then release it, the balloon l d;5,2nvw qei6z6qldwill fly away. This is an illustration w2n d5 ei,6lv6;d qlqzof

  Two cars collide head-on. At every moment during the collision, the magnitu hwd :+wt )0kcayxo: ;6 urinpubv7qi9r )4d0bde of the force the first car exerts on the second is exactly equal to the magnitude of the force the second caiv :yrnui)dohp79 r+c0dwuq6tb0a k ;)b4:wxr exerts on the first. This is an example of

  If you exert a force F on an object, the force w1 eku/a/ n 36qsr0.4 esqjam*tbxoz q1hich the object exerts on you will1s3xu/e1* s6 ej nmq4qzo0qkatra ./b

  Action-reaction force0ysv)gvik )qfa--4r d s

  Action-reaction forces arf gm vny 1h)/ax+r0 vy1:/nbwb8z)e 1)qyq ebve

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to thes ;2bx(lz s )17gm-us ep)spyk car. Since a lot of damage is don)pyksmxbp)1-u g 7e (zs2ss;le on the car

  An object of mass m sits on a flat table. /*t7e)wjzzrx The Earth pulls on this object with force mg, which we will call the actionjz7*)ewt/ rx z force. What is the reaction force?

  A child's toy is suspended from the ce7 02sosl*tjpd iling by means of a string. The Earth pulls downward on the toy with iloj sd*s27p t0ts weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to y6y 8 2oftgecnh .gl3si6qr(b+ou with a 1500-N instantaneous force. The ball hits the bat with an instantanebel y(c qirgntf8 s3g.62h6+oous force, whose magnitude is

State Newton's three z /qgp92z qel0cab.9u laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of hlfkz6/gs,b *the following is true about the mass an6f*,gs k hzbl/d weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distapnb fbqmu+z / wm5o-( (.:pufjnce is

  Who has a greater weight to matzwm 4*nj;ldwq;m1y1z 1o/ .wi4pek ass ratio, a person weighing 400 N or a person weighing 60we*l4o4 ;1 ;zw.q i/ dywm1np jzam1kt0 N?

  A stone is thrown straight up. At the top of its path, the net force actin)c a s/5gp*iqsucr, )si ;as;mg on it issq)sc ;s/sm)g aa ipi*r5 ;,cu

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the same heig7nbb rh3:fde 0mk m:;ght. Ignore air n 0mfg mbe:7hb: 3kr;dresistance. Compare their accelerations.

  A brick and a feather fall to the earee 9 ekc6z 995d5).ppnhrejh-ehtv r +th at their respective terminal velocities. Which object experiences the greater fe 9ezre -h c)njept hkhpd9 65r.v95e+orce of air friction?

  An object of mass m is hanging by a string from the ceiling of an elevator. leab* z +lwa2qp67v2 jThe elevator is moving up at consw av2 6jlp2z 7eaqbl+*tant speed. What is the tension in the string?

  An object of mass m is hangij)2f; 4f2qo:6qk5chi n kok ghng by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensio4 :qnk 2q;kcg)k oihfjf2 6ho5n in the string?

  The force that keeps you from sliding on an icy sidewalk iet wq4cl:)+t zs

  It's more difficult to startk m 0+ae(z0dsq moving a heavy carton from rest than it is to keep pushing 0 qsdekm(+ az0it with constant velocity, because

  A horizontal force accelerates a box fro5w:s)jb,h xdi cz)yp1rd5q, 5l hzqh9m rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubleh 9:zwhd,ch qj5)1,yd5ix zl 5)psrqb d. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity)i ;rg/niqp dhf73 y9b. Thus we can deduce tha/f hy;3r)d7i9qbgni pt

  A block of mass M slides down a friction9jwc 1w(;2;wk jmyn zqless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on theq( 1 z9kn;; wmwjyjwc2 block is

  A block of mass M slides down a frictionless plane inclined ac - 0 qtfc30nlgn;hj)ut an angle q with the horizontal. The normal reaction f00cl -gth3 jn;fc)qnuorce exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an akhn:. 5m 9ve/ma3nd8dmpkxxwhy*c2g -23j s gngle q with the horizontal. The gravitational fodx 3h:jmwag9k2v 8nnmc/5e*sdg2yk 3 x hmp-. rce is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclzmf. )euq s+7o4 7hlhzined plane that makes an angle of 30e with the horizontal. Make a statement which best describes thel7 fz.os q he4mh)u7z+ir acceleration after being released.

  An object sits on a frictionless surface. A 16*)r(5esavp dk-N force is applied to the object, and it acceleraterd k(5 espa)*vs at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate f)b: j9ualj k :ks5y*ezrom rest to 27 m/s in 7.0 s. What is the average forwar)u9jbk*:z a5:syje l kd force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What )o6f ifx e06l ek;12ao9ya tsvis the net force 01ovakoetfxi2 fe)y 66 s l9;aacting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.o.u:kk;aggim5zz( a .0 m/s after travea;k(o5:kizg . azmg.uling
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 sa-)oz lx oz7m1o f.g4qame force that you push a 10-kg mass from restf mxoq4a)7lzog o. -z1,

  What is the mass of a person who weighs 11q68sw+sbe fjc;;o e+h0 lb?

  What is the mass of an object that weighs 250 N on the surface of the Eart(mamue0z1wrxl3 +z 6/eb. imph where the u(6i zempr/ ebz1a 0xl.3w+m macceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg o. 6mjl28wgdeut4o- xs n the Earth. What is the mass of the object on the surface of the Moon where td 64e t u.gs2wox8ml-jhe 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 o21b i m7taxwy:n the Moon. The Moon's gravit xy1t2iwm 7:bay is one sixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a hpl xo0pn2j5 3v 1s/tetug-of-war by pulling on opposite ends of a 5.0-kg ropep/hns elx3ov jp 2051t. Sue pulls with a 15-N 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 surface. A foco xv;f-ma .v) n-tnk/rce F acts on the stack, and it accelen-m ) ;/-tfvxnak o.cvrates 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 thy.)f/k2buo9*o ;qai-mokgrte scale be reading when the elevator i9oagoyui.kk tmoqr2f /; * -b)s accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If vavy t* k0m.vg2pq. 8bthe mass of the person is 60.0 kg and the eleva vg.v .vt *pmk82qby0ator 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 o6zu-dzm *,c*sv4b oehf the person is 60.0 kg and the elevator accelerates upward with an acceleratimc 4 s *u,6dezz*ovh-bon 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 4 mj3mp0m /vg: z:myoqhas a magnitude of 8.0 N and is3 0:p omyjvqg m/zmm4: directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is heccs- y o;d kf75og8hd+ld 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 notofd- s;7co+chy58gk d to slide forward into the cab?

  An object of mass 6000 kg rests on th0wz ;bq;1njg6ojc jn8 e 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 tbj gzj;18;6woj nqn0 co slide forward into the cab?

  In the Atwood machine shown inhcwqy pd. 23cxp07wi( 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 tc 3w(qpiwxp 7.0c2d hyhe mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if 0nzqvvv41m oy yf74a9M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignoqn91v4y v0y4vza f m7ore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor7m0 d sc4(holimug/5 q with a force of 100 N in a direction ou 5i gqhlm/dc(mos47 0f $37^{\circ}$ 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 floorlk6 7 9rdpi;1prloa)u with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal fo a1 llpi 6rpk)ud7r9;orce on the box?

  A traffic light of weight 100 N is suppwx-y+3qte)rews h24n orted by two ropes as shown in Fig. 4-2. What are the tensions in4eyhwnw - qxr)+e2 s3t the ropes?

  In Fig. 4-2, if the tensions in the ropes arnrc +s eud,+8 ip eid,;jgxfnc1c;6p7e 50 N, what is the mass of the traffic ljece iic; srn;du6f8g1+p c+ p nxd7,,ight?

  Two boxes of masses m and 2m are in contact with each otherzg1 :;/ zatwkkseh,f7o g3in 5 on a frictionless surfachk1; a/f 7ztg3skzgw5 n o,ei:e. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with eagy r u*)it01kqch other on a frictionless surface. (See Fig. 4-3.) What is the ne)k q* uyig01trt force on the more massive box?

  Two boxes of masses m and 2m are connectedgmdo1qn16mx:9shb 6p by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in the poms 191hd nm b:qg66xconnecting rope?

  Two boxes of masses m and 2m are connected by a rope.y px1r23i5vg(i eh7mm (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration 7hr(i 2vg1pe 5mxm3iyof the less massive box?

Two boxes are connected by a cord ruxfqh o wza65-1nning over a pulley as shown in Fig. 4-5. Box x1f5wozah 6-q 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 frictions between a 3.0ja,ims1bf 6b.ti p3 j+-kg box and a desk ar3sit 6aijp fbbj+.m,1e 0.40 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 frictions for plastic on wood asy3xona 3/b+p re 0.50 and3 /pyoa3 xb+sn 0.40,
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 mot8-vqi w o;xy6l)2f9 vss6fcomes to a stop with a constant accelera;f6 x9-lsisvyom6 8ftw q)2ov tion 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 surf0 )c 4auc6ttsm,qwww/ ace is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?qat60 cw swut,cw/4m)

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at g7q fugh-nf99a 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 slides 50 7 fynp o.gne(:rqwp 91m on the ice before it stops. What is the coefficient of kinet9e p.fw1rgn:p 7yn(qo ic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 if5pa j7mv:3sr 5dn 5ym 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 the car when the brakes were ap7 3d ji5n:yfa vr5ps5mplied.

  Two boxes of masses m and 3m are std ngaw r(t;.grq.n7:m acked. (See Fig. 4-6.) The surface between the more massive box an.(n7;dq: w gtrn r.magd 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 stacked. (See Fig. 4-6.) The surface between a m88s1b(:5ukpsb25z qrbns eth8bn:152 bspm skrezbu (sa5 q8e 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 the boxes?

  An object is on a frictionless inclined plane. The plane is inclined ap vc4yc w:b 3e bfayxxv+yz) :5d:6h9pt an angle o9:yvabe3p :6+ycfpz xx v:hd )y5b wc4f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an anglv kos(x4i0q 6 xf,brm9e of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smoothu37et c gaukb9h0 s48p 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 inc(dvpvbr+:dy - lined plane 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 directly down an inclined plane, at a constant velocit cw60b pkrciy 1,, f8sos(ox9gy of1 ,(orss,yx9wc0 cfip ko86bg 6.0 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 hxgoie+ 2i 0 cimo8rved/am:c0/-2a ,is+gw tdown 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 dw vn .ve9*t2r q5afnl6own 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 rohfw )/ir) dwz.v*pqua0z1 v2cugh surface. The cable attached to the log makes an angle/p )a2r.*d vfzcv i)q1uhzw0w 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 agl2c.a r5hfqs;pvf oktn/9- - rough inclined plane tilted at an angle of;/ -s.onq-fvf2rp lkg hct5a9 $33.5^{\circ}$ 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 gratsp tj(uk7n0 4dually increased until the object begins to slide. The angle at which this occurs is q. What is the47 kts0(tujnp coefficient of static friction between the object and the plane?