Which of Newton's laws best /p azqmrz,mvw20- .w nexplains why motorists should buckle-up?

  When you sit on a chair, the resultant force on you t 1ognkf z(zz()sh84 qis

  In the absence of an external force, a moving ob og67t,w+efg sject will

  When the rocket engines on the starship N18t r4 kjsd rxd-+m(c.,2ygq5wki cel O-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, tht4 d rijc.ed, 1lkq8s5mg x k-2wy(r+ce starship will

  A rocket moves through empty space in a st8sqnr u.s6p9z raight 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 rocke q s69zr.u8spnt in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you1kn/s- giz zt 3 ylngu-xq1-z7 suddenly fall forward. You can imply from this g 1zsx1qyn3-z t--kulgi nz7/that the bus's

  You are standing in a moving bus, facing forward, andpkussian0j86a5sst: q t;+ :k you suddenly fall forward as the bus comes to an immediate naqia 8:0utsj; 5p+st:ks6ks stop. What force caused you to fall forward?

  A constant net force acts o /xpvj 5a(gv qlkq86v5n an object. Describe the motion of the object.

  The acceleration of an object is inver a w6wv,th5oe*sely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net*t7cw e) tadncl- 78eu force is applied t7c t8ent -lue w)*ac7do mass 2m, then the acceleration will be

  A net force F acts on a mass96 km anbo4ug;7cl*w n6dxd(y m and produces an acceleration a. What acceleration results if a net force 2F actsy; gn9l6bdm (uka x746own*dc on mass 4m?

  If you blow up a balloon, and then release it, the (t8hfo zw))jnballoon will fly away. This is an illustratiowj)8 n)(tz hfon of

  Two cars collide head-on. At every moment during the collisio7 ng+tb2bi xjh w*,5wan, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the s5nb7jt aw, b*h +iw2xgecond car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the object et dxj /24v.pfdxerts on you wiv .dj/fpt4x2 dll

  Action-reaction force+w24om3p euiyl8 .etf s

  Action-reaction forc ,egb;+ph:cl 17 evgkves are

  A 20-ton truck collides with a 1500-lb car and causes a lot or48 y xm/i2thmf damage to the car. Since a lot of damage ishxtmr2/8iy 4m done on the car

  An object of mass m sits on 3 lf 4hb,4 -hsvwp3-.irh v7kp9z 84mcdukdoha flat table. The Earth pulls on this object with force mg, which we wiv.4 zlmddr4k, 3 vci b394-hspw- pfh8ukohh7ll call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Earth p0i7urt-2flj*8x dt j1 yy)fkbulls downward on the toy with its weight force of 8.0 N. If this is the "acti1ftb7yk*j d)tl0jrixyu 8- 2fon force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous forc2 iua .1;1q dckzjp2o7ppfv9ye. The ball hits the bat with an instantaneous force, whose magnitude isad9yjpocf2 u.7v i ;pqkz 1p21

State Newton's threemp0m8,r-ksd d laws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than on Earth. Which of thk,5;l kk7trqqe following is true about the mass 7kq;trl 5k ,qkand weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dtu:twki7)5pec8 l ct1istance is

  Who has a greater weight to mass ratio, a person wewt4auu g2xp u3ox)g-9ighing 400 N or a person weighin )gugxopu9- x42ta uw3g 600 N?

  A stone is thrown straight up. At the top ofunh: jqiy oy e3(+f0i4 its path, the net force acting on y(qnhyj+:f4ui0 io 3eit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from tlgch+bho9g*c); zo8za:nm z0 he same height. Ignore air resistance. Compare their accelera:zggao08hz;lb h )cnc *mo9z +tions.

  A brick and a feather fall to the earth at their respective terminal velocities. y;tv1 96a)t 3jwnvhwggjvb4. Which object exp 9j;twt.yv3 bnw6 1vv)hg4 jgaeriences the greater force of air friction?

  An object of mass m is hanging by5fpj vshw80llpsd j /8 x2e.z3 a string from the ceiling of an elevator. The elevator is m f38e5 .x2hsdjszw0/pjl8l p voving 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 elevatoru 6h gfm6v+5zm j-wg1/dvuxq4. The elevator is moving upward, but slowin/h+uvv5 fmu-j6 gdx461wqm zgg down. What is the tension in the string?

  The force that keeps yphg04l ai wl4m1pgg2; ou from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton fromjw(. -c 3m jhqze+qv7lx3gls ) rest than it is to keep pushing it with coq lc3ws j gzm-e(7j.hq3 )lvx+nstant velocity, because

  A horizontal force accelerates a box k5y j2hp)iipfhbyp :i: 4 p,j8from 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 thaky:24)jpip,p i p:8fhjihy b5 t the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an 0o9yt 2-bp:j(mdq ctginclined ramp at constant velocity. Thus we can ded t c:tqb0(pm-2yjog d9uce that

  A block of mass M slides down a frictionless plane gmk 7-/snl )hpwn3 tx6e4pg;zinclined at an angle q with the horizontal. The norpz-hg mlnx 7;3s/)6gnwkpte4 mal reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclined at h5 li ha5 +qbcj0gf,kk:imb7/ an angle q with the horizontal. The normal reaction force exerted by the plane on the block g,jfb0 m kbaqk 7il:/ic5h5+his directed

  A block of mass M slides down a frictionless plane inc5(.9b go yobwilined at an angle q with the horizontal. The gravitat.b 9 wg5bi(yooional force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultaneously on anyp. 4rk2fk,o q inclined plane that makek p.k2fo4 ryq,s an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A :bjon3nkjiw2 op l*5wnuz . 9616-N force is applied to the object, andj*3nz5jui9n6 pww b no:lk2o . it accelerates 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. Wmci xy-d3 oei;24.ol*lb(xog hat is the average forward force onyco i3e dx m( xi4l.go2*-lb;o the car?

  Starting from rest, a 4.0-kg c9 xrejxb wf 2 vs8q1v6 lrig3;04/elebody reaches a speed of 8.0 m/s in 2.0 s. What is the net force acti1e/lrcs beqx lfrg 8i;9vw0v24e6j 3xng on the body?

  An antitank weapon fires a 3.00-kg rocket which acqo9m+xnhj r.-h 2:lrbc lx d2*fuires a speed of 50.0 m/s afteh-+mlfn jh xc9r2*odrx2b .:l r 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 apfw17))6n-wm9k/lc u hv eopr 10-kg mass from res9nr/p)cewl1hp6vm kou ) wf-7 t,

  What is the mass of an65 / pajcu aa,fk(zs6 person who weighs 110 lb?

  What is the mass of an object that weighs 250 N on the surface 8y jg*f gr,1hkc fq)q sow8g..of the Earth where thsj)r f*gyw. c8k q18q.,fgo ghe acceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass uhj(40 5owo*ki f,yekof 60 kg on the Earth. What is the mass of the object on the surface ofooukk e (* ,jfwyi0h54 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 63o /sj1yor-fi w kl(e o:fh0 dq/dn6athe Moon. The Moon's gravity is one sixth of Earth's. Compare the i 1( fw6d-ooeny3jro ds/lk0/:fqha6masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposs dyj(( ,m8msvite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is y dmmvj8s(s (,Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level f+ z6i*ly pvqtw( h n651xeoh,o-lst2wrictionless surface. A force F acts on the sta+s,hipnwq t ezlx(*6tlo5h2-o16v wyck, 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 eleq5 / -zgzg7-;ts3(hvjmfs7 ge mshb. wvator. What will the scale be reading when the elevator is accelerating d7hhb/t5sszw--q7vgg;g sej(.3 fm z m ownward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. q* n2e hfe4bya;ngg9dtt4dm .p ;r9a- If the mass of the person is 60.0 kg and gp q-;*2nn;9y ta 9bf.a4gdmee4r dht 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 person isjxf. 8yye ix3z6.,l)fmttz 65kr;b w jlw4zr - 60.0 kg and the elevatormkx4 z65jtbf3ry x8z ltewf6 j)yiw.z-.l,; r 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 magnitude oe52 c vxo l+4bf15yvvlf 8.0 N and is directed due north. The second force toward the east has e1xv4y5cbf lv+5l2vo a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kgjivfhb4b5 pp:3 xc, 8q 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 hj4q:p 8 bvbf3cp,x 5iis 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 6000 kg rests on the flatfc 1r0apc f u)ar/;l1nbed 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 minimuma)/fa p fclr1ru01cn; stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown i2 oydcu9ltv2f;ia38 4yahvf 4 n 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 the mass of the p8 2 ui;fy9ycfa4a4lovdh 2t3vulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg a1nrny w z8v004j )bwaknd m = 0.40 kg, what is the tension in thea0 nkbwj)ny81w4 vzr 0 string? (Ignore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizont,6)u47ybij8 q qrlot hal floor with a force of 100 N in a direction o ,jbhq6ou)t ri47l8yq 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 on a smooth horizontal floor with a force ofaoo lc6rc+g :. 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 norrc+o ocgal:6 .mal force on the box?

  A traffic light of weight*u; afyny,wx,l0qz22v)r xhr 100 N is supported by two ropes as shown in Fig. 4-2. Wha,nzxqu)*v2; fr,yr0way h2xlt are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropesa3ub yadv,:u0u/ ll5jo i.8gu are 50 N, what is the mass of the traffic luuj.yl5l a auvdgio 83/bu0,:ight?

  Two boxes of masses m and 2m are in conta vl1bbx j c;595owrn-tct with each other on a frictionless surfac5t9 vro wlc5 njxb;-1be. (See Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in c9- ath 7u ay./xbeurk5ontact with each other on a frictionless surface. (See Fig. 4-3.) Whrbuhay5kaux7-/t e9 .at is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4b frmhckn:2 wi7/oz7:.) If the forward force on the more massive box is F, what is the tension w27 /f:7rz kin:o mbhcin the connecting rope?

  Two boxes of masses m and 2m are conne)llj v/ +e)rmycted by a rope. (See Fig. 4-4.) If the forward force on thl/ yjlvm)+)er e 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. u70rrcp ck5wli1r. mx8h +v3c Box I ofuw .7 lm01crrvi3 xhprckc85 + 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 3.0-kg box and a deskc;p o;hb-k.s;(l h x9bp3uwauq4 ysy( are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is oa(; (ku-p .3p ;u hyyw9c;xh ss4blbqapplied to the box?

  The coefficients of static and kinetic frictions for plasti7gpm2s3svul.1rd* v/ 1 l fsmxc on wood are 0.50 and 0.41 sdrlxvu13m*7lp g ms2f v.s/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 sur0yqxpdqf q--, z t)g6pjms 3l.face in the +x direction. It slows and comes to a stop, l 3-q-6jzydp .xfpq)g mq0ts with a constant 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 surface is pull8n:+udk9+m. y+fqe2eh fa uy ied by a 5.0-N force. A 3.0-N friction force retards the motion. What is the accelerata:9u+ +ydf qhn28em eukf+iy.ion of the object?

  A horizontal force of 5.04iwz 9 3dtgz kapy 3e;c4dhksz m1b+71 N accelerates 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 pn 2u -1*q3b-dokrvitdi/wfk2 uck is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinef k23v*qkd-dt1/2-w oirnubitic friction between the puck and the ice?

  During the investigatiezsk7)4o .ypwon of a traffic accident, 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 the car when the brakes were a4e ky)o7p.zw spplied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface between 5m 0cz2bv7l ah8-mb si4ryt5 cthe more massive box and the horizontal surface is smooth and the surface between the boxes 2vch7m sblzr5tcm50i-4by8a 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 betn8c 9r: 5 nqgcqc(bq*s,iqyb7ween the more massive box and the horizontq cgi qcs9 qcn,(:n7y5q*bb 8ral 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 at anm3(,0+p a62dwl z0zvhhmtwnh angle ofwmmz0(d ,3 0htph26hn a+wlvz $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle oqqc jq of7)08.w;ii l vri5fg/f $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plane wit5 /oncai-4kw lh 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 sml 96lwl ag4 9bkbt;nv3+ 7pclqp wiq8)ooth 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 inclin1-y8qj p a4efmcigb8wg 8x+h2ed plane, at a constant velocity of 6.0 mpgfy 1b8 wh4imxgj q-e 2+8c8a/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 swo5 rkb(+f:kogk j9.dlo5g,glides 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 s cllk4z n531mshq0h (ex8 bkm6lides 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 Nac27u 1zw+5ex eow1 lo along a rough surface. The cable attached to the log makes an angle wew7ce oo5u12a+l1 xz 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 umv6ve +d 6v0wrough inclined plane tilted at an angle of 6 uvvewdm6 0+v$33.5^{\circ}$ 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. p--:dp m 94rzhc b3hrijdv97z The angle of incline is gradually increased until the object begins to slide. The angle at which this occurr9j p3bhdm4ch z:d-pv7rz9 -is is q. What is the coefficient of static friction between the object and the plane?