Which of Newton's laws best explains why motorists should buckle-uphlptkq6)4 - k0/ncah h?

  When you sit on a chair, the resultant forcj f-f 7ppu(aq 6ppzo 9;laa.-me on you is

  In the absence of an external force, a moving obji+nb+fo 4 +om lkbi: ,54v-uzuwkf1agect will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlp25.8y(xnjzshig )g9g.z wbx y turned off, while traveling in empt zjzy 9(8gw2gsgxb .x)hni5.py space, the starship will

  A rocket moves through empty space in a straight line with constant sper.m5*qrw/hp yv (n gw1zemk/ w prk59*ed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to t*y/ qh(w mrz5/kkre.w 1*rpgw p59mn vhe rocket in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenly f3 drzsrc 6moab 3eij8wqa (;:.all forward. You can iiq o3wa:. z;sdae6(8 c3brjrmmply from this that the bus's

  You are standing in a moving l5- s hu hcasp/pgo1):bus, facing forward, and you suddenly fall forward as the bus comes to an imps5hha s/: pog-ul)1cmediate stop. What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of the objecfx+0nxz 1akd tb6c-xvxe z; ia)d7, .ft.

  The acceleration of an object is ij7ea9 srxx6cekk2,z1r c-j -lnversely proportional to

  A net force F accelerates a mass m with an accsggab.0/vc *x z:kz1yeleration a. If the same net force is appli yk1.xbg zs0c:v* zag/ed to mass 2m, then the acceleration will be

  A net force F acts on a mass m and pro ;.eo5c p4zrym *d 8abgnw-ny+duces an acceleration a. What acceleration resuly.* abyre8wog mc5+ zn4n dp-;ts if a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the b c 9khd t-xz;sht/8m7talloon will fly away. This is an illuh /8x9k;c-m tszhtdt 7stration of

  Two cars collide head-on. At eh;5/ge bmg,h every moment during the collision, the magnitude of the force the fir/g ;5gh,beme hst 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 q dyd+tpi/;g,g; 5zimexerts on you willizqm t;di5;/pd ,+gyg

  Action-reaction forcesp1bizcl iv yz l ekyfc7weo:76n649))

  Action-reaction forces ar.aqxcy4h p4k)j*z4 c g;wt ,ode

  A 20-ton truck collides with a 1500-lb car an* zsex4g;. n- 3lgcntyd causes a lot of damage to the car. Since a lot of damage zyce n;4x3tn.- lgs* gis done on the car

  An object of mass m sits on a flat t,b;t xar+d:mo p1hbe0able. The Earth pulls on this object with force mg, which we will call the action force. What is the reactbob1:x h0e; dm+r,tpaion force?

  A child's toy is suspendeal*swp/l2*j ) o/ld gad from the ceiling by means of a string. The Earth pulls downward on the to 2aw)ds lpj/ ag**/lloy 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 rey1p4+7hlp*ri1a- /es u xybp ac(,lto you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude4prarueep7ip1 +/( ,l1-cy y hxsbla* is

State Newton's three lrh ii5u5:9ykxd ar vfxpe) 7/6aws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on E3-kr58b, v)*jnvo aqg bwk4dzarth. Which of the following is true a k5*gdjwbo3qr,a 4 bz8)-nv vkbout the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force whic8marpe42 fr /rh acts at a distance is

  Who has a greater weight to mass rat3af k3csswjac* /;*ujio, a person weighing 400 N or a person weighing 600 js**a;kc 3/cwaufs3jN?

  A stone is thrown straight up. At the top of its path, theek8zk:esk 44a/b 4tjt*ds)c fw- zr1d net force acting on it is1ekk w ss 4bc*8a4kzzttf rj/:4de -)d

  A 20-N weight and a 5.0-N weight are dropped simultaneously from the sap-jx :t 53gd zxgzh86uemu4 h1me height. Ignore air resistance. Comp-eh5 hgx zmgxd 1846ujtp:u 3zare their accelerations.

  A brick and a feather fall to the earth at their respective terminal veltuo1+jj0: pox ocities. Which ob oopj01 :xujt+ject experiences the greater force of air friction?

  An object of mass m is /lo9pb cx+u :shanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in t ulsxoc+/b9:phe string?

  An object of mass m is hanging by a string from the ceir)6 kh+ kts62gtjn5r qling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string6gj6skr)ntr 2k5h+t q?

  The force that keeps you from slid2p ;z*iaa wfso. qe2+xi i/5mping on an icy sidewalk is

  It's more difficult to start mok)mwx1ctq z*xlr t: r 6zk +*5/p9jzocving a heavy carton from rest than it is to keep pushing it w+r/xwq*zo :czpr5*ktxc 961mjlk z) tith constant velocity, because

  A horizontal force accelerates a box from rest ac9kpujomqj(k: 73)s m / 0ts*umhb7 fwrross a horizontal surface (friction is present) at w(9 / 0sku m* 7mju:)fb3trjpms ko7qha constant rate. 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 inclinebz wn),qxs/c* d ramp at constant velocity. Thus we can deduwbq *),sx n/czce that

  A block of mass M slides down a frictionless plane inclined at an angle q with + la6u znr4)dsthe horudn a6+lsz)r 4izontal. 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 scy1a0c: ay(rse+cv4. xsd5tangle q with the horizontal. The normal reaction for01ev c5d cyys s (.sa4r+cx:tace exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined9 c1k+;z zjoyq at an angle q with the horizontal. The grazjo1y9zc; k q+vitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simuekxp6oum9c;srn3 w c 18cq9 w5ltaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a stawcmn9qc6;5 s rp1wke8 u9ox3ctement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied --mh0v8oiqw hto the object, and -80 -hhvqo mwiit accelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accels2 v : 7x w4sj5/s+fdjrunu;bierate from rest to 27 m/s in 7.0 s. What is the average forward f s;n2vxru/jbjf u :w5s7d4is+orce on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in1+g :7 ldg9a) iicfm pa.c*ekn 2.0 s. What is thnmp1* a7k d) f:ac9l+giec.ig e net force acting on the body?

  An antitank weapon fires ai2xj;ol/o*( jb0k xffh+yf l- v*y m5a 3.00-kg rocket which acquires a speed of 50.0 m/s after yxal5-vj( f *+/ lj offi0; yxkb2mh*otraveling
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 tha cap tzimjv o8,9m/t v43d;j3mt you push a 10-kg mass from ret;zmm89 /3v 4j opvacidj,m t3st,

  What is the mass of ae(d 9 t/bgph)p person who weighs 110 lb?

  What is the mass of an object 2 /) zeayb1vonb6xmz;that weighs 250 N on the surface of the Earth where the ny1v)x; 2e ozbm/az6 bacceleration due 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 obje0qn iicrb4bn/cha9. : ct on thec/bni4q:n0h9cir ab . surface of the Moon where 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. T7y+)bkvvts)r a +b :umhe Moon's gravity is one sixth of Earth's. Co u)7vy:k+tr+s) bbmavmpare the masses of the objects.

  Sue and Sean are having a tug-of-war d;t15czcx k)zby pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates towarxk 1 cd5;)ctzzd Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F1c9 ldg);srgf acts on the stack, and; gfls d91rcg) 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 *4 iz * 9e( 6olnyya9kpxyrmh9dqtw 1-will the scale be reading when the eh-x yi z yd9m6wyq*e1k(*lp ro4nt9a9levator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevatotf+w2o3r p(9nph ar( 5 f 3*kx0xs(un6ceuzw qr. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration u zexa6(5r t wopp3 (r3w *unc9(+ xnfsh2k0qfof $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an ee. 4m*v q ha0u+;ipfkzlevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acceleration oe+0q.i4 ;*vpuhka z fmf $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-b y8:)60 cijy q,t6lh4lkzv o-7ivmti kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N7)hlvt k ,yt -8iqv:o6 0i4yjcmlz bi6. What is the acceleration of the mass?

  An object of mass 6000 k*7ll8b .0qc xwvtduab xx74g*pebg 5*g 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 travebdpv*al*bc7t qxx5lu* eg gbw x784 0.ling 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 flatbe2f, en0 gafm.m9w +pgkd 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 to slide +pw.0m fefagnmg,2k 9 forward into the cab?

  In the Atwood machine s;pf0 3hrk;v* ihost 5ahown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acs5vr;t haf*iok;3 h0pceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 k10 4sbe.zbrv4a 0 zk s2wwb4ksg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley. 1sk 0ab0w 4szw4v sb2kbr4z.e)

  A student pulls a box of books on a smoobdd g vm0,j0z;sgejlq8c )w6b(1he,h th horizontal floor with a force of 100 N in a directcq(60 hg gjbj8 e,mw d)h;e s,ldz1v0bion 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 ho o p.3pkm9k6zcrizontal floor 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 formp 9o.3kckz6 pce on the box?

  A traffic light of weight 100 N is je7njvb. 6j1m supported by two ropes as shown in Fig. 4-2. What are the tensions in the rje6jb.mn 7 1vjopes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is 8w*vi 0jr .uaero5b a7the mass of the traffic a7.0r i arj*8vu eo5wblight?

  Two boxes of masses m and 2m are in contact with each other on a frictionlxtwf7d k5( -n3yp) lrvess surface. (See Fig. 4-3.) Wh( 7f5p-vk)ln w dxrt3yat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in coe5uy*)k 2wvl/p x a- y3wzgl.xntact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more w.e*3lap-)g2uyvyzxk l /5wx massive box?

  Two boxes of masses m and 2m are connected by a rzv nhuh7xu ct) 2)v(0j1b;erpun:ns+ ope. (See Fig. 4-4.) If the forward force on the more massseu )2jp un;:bt07( h hcnr uvv1xnz+)ive 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. 4-4.) If th9 () pdk2dpm.mip 2twirquu /8e forward force on the dmw(m29 8r diuipp 2u/.ptqk) 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. Bw/+3r0sdhozfl 5wexlf( 45t/boz1 uj30i h zroxf4 rwlhz5w/z030fr zxeu (i shojltbo3+d/ 51 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 frictj cf,4 u h-5gzwq0f5jwions between a 3.0-kg box and a desk are 0.405wq5j -0g, 4 wfzhjcfu 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 kizs*.qh7/t vb.b rbk1- j.cys bg0amh (netic frictions for plastic on wood are 0.50 andhbbrj .*skt-q7/ 1 sb0 cba( hyz.gmv. 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 directih+n25 wcc xer n+net43lg9; oyon. It slows and comes to a stop with a constant acceleration of r;2g9 nhc4ocl+x ty5 we+n 3ne-$2.45 \; m/s^2$. 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 5.0-N fjyn q0a*v:3fporce. A 3.0-N friction force retards the motion. What is the acceleraf3:npv*0aq jytion of the object?

  A horizontal force of 5.0 N accelerata;fm 0w*s cxefy(6wm-fr y vcv1 w.c53es a 4.0-kg 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 ini(qzg9td*d t o:tial speed of 10 m/s. It slides 50 m on the ice before it stops. z (otqgd9d *t:What is the coefficient of kinetic friction between the puck and the ice?

  During the investigation ofrecdm, 7h1)kox8rawm b5 .ar2 a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction betwbwx.rc r, m7m1h8doa 5 2)ekraeen 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 anp/v 10*c1rb kxx1evxi d 3m 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 roughk 1i1rx1bxp 0*e/ xvvc. 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 betweenp4/h6i y95ee khhjic ,/u fib7 the more massiv4ef/eihipcb9 , /yu7khi6 j5he 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 pl*x-x w0npe h1nane is inclined at an angle ofne wnhx0-1p* x $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a f*0zujll)yex pwyej 6gl )r92+a ai7 k2lat hill that 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 inclined plane with an angle o *s: y *fb9h*xsym*kpxf $37^{\circ}$ 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 smoothv9u lf l/vup4; inclined 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 inclined2:opest9k+xjsg4jqoi b)l:(,yyn u: plane, at a constant velocity of x+sql,e) :t bougyn:k j4:j9ois y2p(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 down a rou1v:h5 aeh, qough $37^{\circ}$ 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 do9thj * i*cx0fuwn 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 3 5*3inhe,fbx fvtlx,46 8m5jvlrzm usurface. The cable attached to the log makes a hx3n 5zv lt5ivm8f *l46xu bfmr3,e,jn 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 released from rest on a rough iuwlm 60u/ 4d+riug yfnze/-/nnclined plane tilted at an angle of y/dewrln gm uu/i4nz-u+60f/$33.5^{\circ}$ 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 ipx c1o u)jrp6.nclined 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 rp6 uoj)1px.cfriction between the object and the plane?