Which of Newton's laws best explains why mo,mz) 6fjz o4quwu+c2 o) fr vkl4yz6e5el4c,xtorists should buckle-up?

  When you sit on a chair, the resultant force on /j lslhb 5(q44dw 3k3s(i cudfyou is

  In the absence of an external force, a moving ob66 barjw,yy(uy,2,si rwo u6rject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are7bwo2 zsn.i0dt(d q)9li g:qz suddenly turned off, while ti(sz: zig2) wq 9to07q.dblndraveling in empty space, the starship will

  A rocket moves through empty space in a straight line with constant spezfm 74 )rwxk6t6l i(cned. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocketn r4(i7mx6wtkc)f zl 6 in order to sustain its motion is

  You are standing in a moving bc4g jq6)b9 iguus, facing forward, and you suddenly fall forward. You can imply from this that the buqibuc469)gj g s's

  You are standing in a moving bus, facing forward, and you suddenly fall forhg l4j5+na.n liqfk4x4;wbv/ward as the bus comes to an immediate stop. What force caused you fg/.q4;nkwx 4jbv anhl4i l+5 to fall forward?

  A constant net force acts on an object. Describe the motion of the 3s6m uoc7, eaxobject.

  The acceleration of an object is fl4 xut qn v4l2 fq:,8fnxm8ehw; 3;vtinversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same /+ lc ,cuvggsei. n78bdrl0o5net force is applied to mass 2m,ll+u50ercg,cs d/7gvn i .bo8 then the acceleration will be

  A net force F acts on a mass m and produces an accelj ys iz7mze sp*55/l:leration a. What acceleration results if a net force 2F acts oe5s5 lz li/7y*zpj:s mn mass 4m?

  If you blow up a balloon, and then release it, the ii*:g3dkkxvn :+5 auufgh69yballoon will fly away. This is an illustration of639* ux fgidi :agu5kvhykn:+

  Two cars collide head-on. At every moment during the collision, thexx8hro(i-b zr3 6yoc7 magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an e7zrb6 xoch xy8o(3ir -xample of

  If you exert a force F on an object, the force which the objp)df b nij;s.8ect exerts on you wilid8fsp;b) nj.l

  Action-reaction force s/eex9;bq3io (3-wj inr3glps

  Action-reaction force 9c.htk7i-x qjs are

  A 20-ton truck collides with a 1 j f* s pqgrdy/ku91wn(us7 oie)11mg*500-lb car and causes a lot of damage to the car. Since a lot of damage f)wy nr7uo9musqks/eg (**ijg d 111pis done on the car

  An object of mass m sits on a flat table. The Earth pulls on im7j bztd /ot27a8:la+ qjomh+ltg sbk h:(*6 this object with force mg, which we will call the action force. What ist 77 a:mgzskhl2+86jb t (o*ihat+bloj q:m/d the reaction force?

  A child's toy is suspended from th3kfrqv/dia, 8o h3v)be ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. Ii8,/da)khqf ov3b3vrf this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous fbd zmeea7e zp-z+bn8 , ed/g,*orce. The ball hits the bat with an instantaneous forcezm+g,ne87 be d/ebae-*zpd,z , whose magnitude is

State Newton's three lawsa ; rx7k3vqje-.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than oi x w4wma4+if0p gqb1-n Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compa w1w4af-i4mxg p 0+biqred to Earth?

  An example of a forceu 8;;m0hyjifr which acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weuo2qbdp37o d.ze9-sh6 uo(b 3tpp fd1ighinddo 6zofts-.h 7udb9pob32 3 pq(pue1g 600 N?

  A stone is thrown straight up. At the top of its path, the net ff - kvq76a(sylorce acting on it is6q(as y-lk7fv

  A 20-N weight and a 5.0-N weight are dropped simultaneousucv )ay7 fdj( v/v-fb6ly from the same height. Idby(6 vf7vf/ua-c j) vgnore air resistance. Compare their accelerations.

  A brick and a feather fall to the earth at ibaq2. .)gy )jkkqy.s their respective terminal velocities. k )q.jq)yb ai2gk. ys.Which object experiences the greater force of air friction?

  An object of mass m is hanging by a string from 2gzb7 yqk)zy fsp3dtc,/++-bgtmtf4 the ceiling of an elevator. The elevator is moving up at constant speed. pb)/- ,y4+z d cfzmty7ft t+sgkbqg32What is the tension in the string?

  An object of mass m is hanging by a string from the ceiling of,;7thil,.dhs vc c5pd an elevator. The elevatorv75hitd.c,h;s , plcd is moving upward, but slowing down. What is the tension in the string?

  The force that keeps you :y fpn,1dtje 6from sliding on an icy sidewalk is

  It's more difficult to s*4m 2xx ldz.mbtart moving a heavy carton from rest than it is to keep pus.l2 b4zdmxx*m hing it with constant velocity, because

  A horizontal force acceleratmwu/+x 7sx xz(es a box from 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 doubled. Wmu/ +7zxx(sxw hat happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus xa b+4 +jrp*etwe can deduc bt4ear +*xj+pe that

  A block of mass M slides down a frictionless plane inclineduom q 3zpmu-z7o96c- n at an angle q with the horizontal. The normaluz7on9ocqm -6m -z3pu reaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane inclineb 2xoc;k(4t8k4zj pttm a*n (sd at an angle q with the horizontal. The normal reaction force exn8p(4kb jam4o(k t *;csztt2xerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at an anlnco kpt)9t1+y9 n0.s8pq/ hwpl 2meu gle q with the horizontal. The gravitationlnpl 9 8qs)oe+k 2pcty/.pmtw901nuh al force is directed

  Two toy cars (16 kg and 2.0 kvv zct4g6p33og) are released simultaneously on an inclined plane that makes an angle of 30e with tz33ovp tvg4c6he horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a fro; cqib.5rd3v ictionless surface. A 16-N force is applied to the object, and it accelerates 3.dr;v5 qo ibcat $2.0 \; m/s^2$. 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. cg4; hv9snmdj7ei9o) What is the aves;n) od9c 74hjgmiv e9rage forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. Wh4qp a3con 6:/fc19nfopk: pqaat is the net force anaopaqk4fqo:p3 1/c:6 cp9 fncting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires 7f 8s nz mzq d.zj-z,u1d3clz7a speed of 50.0 m/s after travelin, j3c1sn d fz8. 7zuzd-lz7mzqg
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 swt4 cwgr 9f-(pb 7bq+ 6zk,hhyame force that you push a 10-kg mass from resqbfgpz,rtb 9hw4y wk (h7+ 6-ct,

  What is the mass of a person who w(km kzscm3l/+3 3b.v bj ocw.veighs 110 lb?

  What is the mass of an object t7gor8 7 jvft.w:gf.vnfx6 6b that weighs 250 N on the surface of the Earth where the w6oj:x ffb7vr .gg vtf 7.n68tacceleration due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 6ku zja/ : ;wdryz,(ul;0 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 o;;d:w ,l(rzj a/u ukzyn the Earth?

  Object A weighs 40 N on Earth, and object qq6gz5vr j9jlc9i0w3 B weighs 40 N on the Moon. The Moon's gravity is one zj6rjq0l wg395 qic 9vsixth of Earth's. Compare the masses of the objects.

  Sue and Sean are having a n tn q1hu/)ern31o lkq,v+nn.tug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls wq/en r1ku1,nlo3tvn q )n+.n hith 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 frictionlessgd, 9v0ma 3.omu*ksa2 od:bcq surface. A force F acts on the stack, and 2qs,cag3 k mvu*moabd:.od09it 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 scalxh:4 u7x,9/ne ymfkz vyh 48dbe in an elevator. What will the scale be readimdh 8v,k7u y /4hyxeb n4x:z9fng when the elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. I 6ia)y2zuulvcc25ug; f the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleracag6 2c ul)2u;vuyiz5tion 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 oupmv+u c(vp0i7g:/n+sr s1 m person is 60.0 kg asiumpn0ov(u s/+ :m7crp+v g1nd the 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 5zbr-(2s83 byt6samgh .0-kg mass. One force has a magnitude of 8.0 N and is directy2tg 36b (ar8b mzss-hed 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 isfm0aijz hh:.c33+k8;zd y;p9 v kij zf held in place by metal brackets that can exert a ma ha8kij0k;:jim zyh.z33 f v;p+ zfdc9ximum 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 6000 kg rests on the flatbed of a truck. It 8yvwf kqcb974 is held in place by metal bracketyfv48k79w cq bs 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 forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = kql d+.v3pjd 40.60 kg and m = 0.40 kg, what is the magnitude of the acceleration dv.qk+ p3 4dljof the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = d4ri38(y- qxm+ .r4ccsygbru0.40 kg, what is the tension in the string? (Ignorr.83 by4s( grymd+x-rc uq4ice friction and the mass of the pulley.)

  A student pulls a box of books obm6t4z -ig9 g/dd b5qqcrsy2-n a smooth horizontal floor with a force of 100 N in a directio5sd-gziq/gr9bd-ytq b4 m62 cn 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 hkdg9gnm0;os8m9tz (e8z2fo g orizontal 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 force on the box o; (n988gke s0 mgtzf2dz9gom?

  A traffic light of weightcuj rz1-uv0m7o;0 ufk 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions z1cumu fu0 - vro;jk07in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, b-ycrckx5,wg s +,q(owhat is the mass of the traffic li -y,s g +qw(okbcr5cx,ght?

  Two boxes of masses m and 2m ar1o0rzuc:d3ew3.i6ex s 8i rvye in contact with each other on a frictionless surface. (See Fig. 4-3.) Whr 60i1s:y xd8vc .3z u3eoeiwrat is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contacipqzz bh/p:gdjq6i;z 891z 2dt with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the more massive box pbdzigq9z2 /8h1;zj6q: dzip?

  Two boxes of masses m and 2m are connectdm0k5u6t4qp3j dhd1wl /9 skbed by a rope. (See Fig. 4-4.) If the forward force ts5hk 30qd6wdmjbdp 9u kl14/on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connexga,c*b. 5+j s lucym4cted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleral.bj*+,5ycgxu4csam tion of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in mukwud +h,+flw1 em, u7+iy/oFig. 4-5. Box o+,,ew / wdfuuhm++1 mul7iyk 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 3.0-kg b 2s* lraj0i3/ vg73.xwq icwgxox and a desk are 0.40w / xii cv302 sra7g.w3*gxlqj 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 6t *g:j/hfqdskinetic frictions for plastic on wood are 0.50 andhg/d:s t*6qjf 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 x909haj so10e:lz+ ln gv pribx:q 1j5comes to a stopis15xxz9oallp heb1n rq 0v0: :9+jgj 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 surfacaeqfa :i tb55u1-t0 qk;f kulf n0)on8e is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is k )kaonf0ufltqf55a18 ut bn 0: -qei;the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a rate oek 85tby+2z5c nyih2u qs x03of $0.50 \; m/s^2$ 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 s cfi h.ws l-m 64zlhsibr*54f8lides 50 m on the ice before it stops. What is the coefficient of kinetic fr4m lw8ch6sfbl .ir4*sf 5hiz-iction between the puck and the ice?

  During the investigation of a t *82aqm+ dw i.gzfrr3uraffic 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 cdumq+f z 3wg2a.rri8 *ar when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface beopf60 h6 9 66gd+ooh7iyzbscdtween 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 static friction force on the less massive bo06p f6ch 6oh7gzdo+ys 9i 6odbx?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) Ta8z ;z5 pqad3uhe surface between the more massive box and the horizontal surface is smooth and the surface between the boxez3dau;za p8q 5s 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 inclinkm;h0x5 yz(i5f u u2uned plane. The plane is inclined at an angle ofk05yh5 zx ;umnui(2uf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of gzj c,2z4 d0e*hx503 r7wjekd bum-iy$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth incliy+xwc+y,4m7hf aag9 ened 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 inclinkxf;tm0xaat ++v019mh fiqa- ed 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+xwi 3vufh qnz m1*u(5 down an inclined plane, at a constant velocity of 6zf wuv5*+i1x(huq n3 m.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 sliba0t0r, zu rz8 :-lc,yxhv v1hdes 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 mzs93g8u:2tgkxntej5 dd5v( q slides 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. The cay qq43.mk5f iable attached to the log makesyq4qa m5i3f.k 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 released from rest on a rough inclined plane tilted 4dm +yvb80afpjob;ur1 bx *z2at an angle ovbmx08z+bf;ob2d*p ayju41 rf $33.5^{\circ}$ 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 inclimqnclq nh; );4ned plane. The angle of incline is gradually increased until the object begins to slide. The angle at which this occurs ilch;q4 mnn q);s q. What is the coefficient of static friction between the object and the plane?