Which of Newton's laws best explains why motorists should buckle-upe+p//.f5 q;mkb,s(o q0xl j ytffjr( a?

  When you sit on a chair, the resultant kj3 hja8e;ye3 force on you is

  In the absence of an external for*i ;x4vs2pg7:bali 4uzdou.t ce, a moving object will

  When the rocket engines onzd s/pit djpx8 t* id9),c1+es the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship wil8de i+9ij1szt x, t*cs)d /ppdl

  A rocket moves through empty space in a straight line with constant speed 4 e-+y6hoqv8ca2v ryzt09zrk. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the r-62v4eyv 89yt+rqh ozak z0c rocket in order to sustain its motion is

  You are standing in a movin6* i rtpln9j:(r)naitg bus, facing forward, and you suddenly fall forward. 6* laptnrn(9 i) :rjit You can imply from this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall forwarn1 osgo-c esz9: (zyv-d as the bus co9s-:yooz 1nvcs(z- egmes to an immediate stop. What force caused you to fall forward?

  A constant net force acts onvtu(p aig 9l h(mrff(2+ f0.vznhwn 3m697gxv an object. Describe the motion of the object.

  The acceleration of an object is inverselku6nmy z 47ylvooh v1/4s74zyy proportional to

  A net force F accelerates a m, yyaz f*,y 9;n91wwzomapx u6ass m with an acceleration a. If the same net force is applied to m;,yaufz1 , nwwxopy*z699a ymass 2m, then the acceleration will be

  A net force F acts on a mass m and produces an acceleration a. What acceleratio f.4wynksrpoow55+ eae* :sp+n results if a net force 2F acts 55 p:psnfye.*o a+ sr wo4+kweon mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. Th(gd5 0ksrv c8u1g3ulp2e oe f9is is an185u v(9rgpdl32g0uocfese k illustration of

  Two cars collide head-o,ex -kdml dogbmx8626n. At every moment during the collision, the magnitude of the force the x,k2dg mo e xl-68m6bdfirst 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 object exer:mg*htp+ tngy99vfm dqv p. 2/ts on you will p/yf9g+mttq pm29:hv.vn *dg

  Action-reaction forc;z5j )tcn0c )l mk)qares

  Action-reaction forces a2qrz3mpr o xpnp837a/re

  A 20-ton truck collides wiq5 wd7vsx 4fb7th a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done oqw7 bfdv457sx n the car

  An object of mass m sits on a flanwob+o86v5sot.z5 yh mg kid)xj bf:r*k )i87 t table. The Earth pulls on this object with force mg, which we will call the action force. What is the w)+: *hng8vtjm.dr kzoi io5b8x)ok fsb y657reaction force?

  A child's toy is suspended frommju6i+ hus. m;pi9s w( the ceiling by means of a string. The Earth pulls downward on the t wu+6iis( uhmj9ms.; poy 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 instantaneous force. The 3hyy d +a2rdge)x2dcu9x4jo0ball hits td + gdycoh9)4y02xx23ajreu dhe bat with an instantaneous force, whose magnitude is

State Newton's threes ,,q -t e*l1msfxm9ir laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on6kd;gydf- 7hf Earth. Which of the following ishy 7g-;fd6d fk true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts a7 wtv88bpw4o7:bg gqot a distance is

  Who has a greater weight to mass ratzo, vj,x( veaxhh2r/1io, a person weighing 400 N or a person weighing 600 1z2e, h jaxhr/v(v xo,N?

  A stone is thrown straight up. At the top of itpt8;xrltvr:b5+ 4+avaa y9s us path, the net force acting on it is btl 5:ruxaa8vpv;ta+r9 sy4+

  A 20-N weight and a 5.0-N weight are dropped v5n(fuse i i-v:;ef.ykh n+9j simultaneously from the same height. Ignore air resistance. Compare their accelerations.kyn ;vife .e+ fj :u(i5-hvns9

  A brick and a feather fall to the earth ;6 5slsjzd6oc0md1p- *nwf opat their respective terminal velocities. Which 6js *;6cdfd0p1-s w o5zlonpmobject experiences the greater force of air friction?

  An object of mass m is hanging by a string frkab rq)qy(r g/t91ql*om the ceiling of an elevator. The 1g)r(aqk qlb9 q/r yt*elevator is moving up at constant speed. What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of an zw3u;3i0x xbudgc3 t3elevator. The elevator is moving upward, but slowing down. What is the tensi 3ug ;3w cbt0zdxi3u3xon in the string?

  The force that keeps you from sl36ccb2x2ida5 3qmn dhiding on an icy sidewalk is

  It's more difficult xn4ymtcaase,-22ac*pi)tv + to start moving a heavy carton from rest than it is to keep pushing it with conap2 tc)yv s i+ 2x*4-netacam,stant velocity, because

  A horizontal force aca1.pvz*e s lfk t4js:2celerates a box from rest across a horizontal surface (friction is present) at a constant se ft:k aslj.v1 z2*p4rate. The experiment is repeated, 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 he*h*o b7nua/inclined ramp at constant velocity. Thus we can ded/oeau7hn hb** uce that

  A block of mass M slides down a frictionless plane inclined at an angle q wyqy4 * esjxk*d2g ay-3;g ;bwxith the horizontal. The normal reaction force exerted by the plane on the b3ax ;4sy;w**xy gb- ge2 qkydjlock is

  A block of mass M slides do+njsxy*mvlp v y1wp s5ng);.7wn a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the bms)vpnpj * ylvg. w71 5+y;xsnlock is directed

  A block of mass M slides down a frictionless plane inclined at an angle q w,,f/pf a7+ dzngq.-9 cogkioqith the horizontal. The gravitational force is d79 okg.fni,,/ q fc+daopz-q girected

  Two toy cars (16 kg and 2.0 kg) are releaseocet79fx mi- *d simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration after be -i79moc *fxeting released.

  An object sits on a frictionl4 0foe3)hkylwpcyx4y753g vp3 xj1ow ess surface. A 16-N force is applied to the object, and it accelerates a05p1 f3yeo yx)g3kpvw yw44 7h c3loxjt $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate f 0bxc1 ;cd rhj,7zkkt0rom rest to 27 m/s in 7.0 s. What is the average db00k xtjcr,zk7; 1hcforward force on the car?

  Starting from rest, a 4.0-kg body reaches a sprgf hy, ,c3fo-eed of 8.0 m/s in 2.0 s. What is the nfyg o3,crh-f,et force acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s aft);ek6y ggvo /ger trayogge;)v k6g/ veling
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 3iy sb0vrbo:.i d; fv )3ecu/iwith the same force that you push a 10-kg mass from rest) :oyi3bi3r /ufv0i .eb;sdcv,

  What is the mass of a person who weijoq ui ( s1(:6j mly/+whcobq6ghs 110 lb?

  What is the mass of an,l (8ike4 fbhh object that weighs 250 N on the surface of the Earth where the accel,l f hek84(biheration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the E7c l;i7y+ a(6 3q fr-xrvpaq e.cfqcw.arth. What is the mass of the object on the surface of the Moon whe+76pc.aiycalfcr e .f x -q;rw3q7q v(re the 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 on the Moon.s(f-v bdz z;k( The Moon's gravity is one sixth of Earth's. Compare tdz (zvf;ks b(-he masses of the objects.

  Sue and Sean are havin u rb8vq2m(2 v2rso)u 3bdo-cz zo,(rhg a tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. 2uhvoq,3rbdu rzozc(ms-( br8 2 o)v2What is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books restx 9iq-i1(wa mkd e6st3s on a level frictionless surface. A force F acts on the st1t i(qsxdaw 3mkie-69ack, and 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 elevator. What will tb e.rplf -6ao(*c qc*zhe scale be reading when the elevator is acceler*lof .az-(rbcpqc*6eating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If t l/tb o0h*f yhi,/us/ihe mass of the person is 60.0 kg and the elevator a yl hu*//iotb0/fshi,ccelerates 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 mas u7o7nym-jw* a dgln bt3, r;ns( b:ekv,ou,n8s of the person is 60.0 kg and the elevator accelerates upward with an acceleragn,aetoj-,m:n l wrbn3syun 8 k;*vudb (7,o7tion 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 magnitude of 8.0 Nvim+64uu j706zrc dlwy wf6i/ x0tog4 and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration +66gzm 4txd0vu6wfuiclr wj4 y/0 i7oof the mass?

  An object of mass 6000 kg brcf 5 oow+ie( noro8l+37l0+uiyw 6orests 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 is0oo6nr+i 7 3+roce5o( ybwul ofi+8lw 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 a truck. It isw2c6v v fp6q8a7d0bdu held in place by metal brackets that can exert a maximum horizontal forcevd7w6bqcf2pu0 8v d6a 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 rl-ppc+ roe.6 shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acce6-lrp . o+crepleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M =qwuyu)/lb9p 9 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the ma lwubp/u yq99)ss of the pulley.)

  A student pulls a box of books on a smooth horizon;2 yynp1rlsrrft()-htal floor with a force of 100 N in a direction oty21;hrn l (ps- yrrf)f $37^{\circ}$ 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 onfy r1+pcf*ed-a i5b 2n a smooth horizontal floor with a force of 100 N in a direction of 37.0e above f1r n*5 fdbc-+ iy2apethe 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 by two 9hbq/z)e7euajy t cnek0 +ki.+fp*e 2yw9ec7 ropes as shown in Fig. 4-2. What are the tensions in the 9i f*)aq79+ eyket0c7 wck /zby.e hpnjeu+2eropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, wh qll)lobm5a3b+d9 - wcat is the mass of the traffic light3o-q )9lw b5lbdca+lm ?

  Two boxes of masses m and 2m are in contact with each other on a fric*1od r4uvmd5s tionless surface. (See Fig15sdm uv o*4dr. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2mbz4lru -9qzt24nzqme82pb;zg)5 ivy are in contact with each other on a frictionless surface. (See Fig. 4-3.) enzq uyz225m)plvzz bb4 4rqg-8t i;9What is the net force on the more massive box?

  Two boxes of masses m and 2m are connecte/+ma erbi( tglcr+ .5ud by a rope. (See Fig. 4-4.) If the forward force on the more m r.+gmruc 5/btelai (+assive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4z2 lxc.jfijt; 7:y(qv .) If the forwaj:ix (vfq7.; jc2zyltrd force on 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 pulley as shown in Fig. 4-5. w(ufev23,wm4no wrb6x 4 mln. Box3fe2lxrn4nwb v wmmow ,4 6.(u 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 6kp6fttg4riiv 9c 7la ;dj1k7 between a 3.0-kg box and a desk are 0.40 g ;d76lfik 94jpa6k1vt trc7i 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+sfjp byq 0rqd,ou( s t.6*f5s for plastic on wood are 0.50 and 0+ qp (r*osbsj s, fyu.6d5tq0f.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 anp7rg dkk c:r0,d comes to a stop with a constant accelera,r7 gpk d:rc0ktion 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 a 5sb+* q79w), ctbid brn.0-N force. A 3.0-N friction force retards the sd7br b)q,*wb 9n+tic motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, atj jfon6s0m ab 1(hs;4b 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 slides 505rl3o i use+z*ky/zy5 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and thu/e* ylykr3+5osiz z5 e ice?

  During the investigation of a traffic accx pwyot,* d 1:es49szmident, 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 spe4t1weyxs:,z p*d oms 9ed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (S2+87 2z 6oggry/ b-r8itxrzazktmhx. ee 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 st+zgy z tr 7im8k/rr2x-btx8o.6 gzah2 atic friction force on the less massive box?

  Two boxes of masses m and 3m are stgy-;4i qy7r5uj9lf;e*zt -isf q*s atacked. (See Fig. 4-6.) The surface between the my sl4z-ti 5g;rsqtfaeji9*q;fy *-u7 ore 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 io8uj 9oc ;zaj6s inclined at an angle ojc ;9jz6oau8o f $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill ty+k h biie;4/uhat makes 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 incliq+ qbu1 v( jm.6ftpbu+2;oifu ned 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+o9c kprh 89dd 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 direo+d)f-lnnv fk) 3gb/0c f 3hjd*lcl2xctly down an inclined plane, at a constant velocity of 6.j/kh*d3lo n)llf nb gx20c3c)f- fdv +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 down a r c4fa.h8-t 4i dt,rmc*zl1)9iezmo z wough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m s:tzjy *x.1.nem9lu na lides 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. Thebzu; ;h/7t zngjss4z (h+9hdp cable attached to the log makes an angl9nj zsu+zht4; bz 7h/gh;s(pde 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 ince/15pcv oiyexd p26.rlined plane tilted at an angle /1p p5dey2 xv.i6rcoe 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 inclined plane. The angle of incline is gradually y5usq8q5i3k o u fy2ki(.g a/nincreased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction betwu 5f5ski.q 8/2ag uoq 3y(iykneen the object and the plane?