Which of Newton's laws best explains why motorists shoull m*ppi;zwt4u - b-a-ld buckle-up?

  When you sit on a chair, 9 c;u2utz2bismr0,zp the resultant force on you is

  In the absence of an external force, a moving d3-3ejpr 2 zlaobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN nqy 2, *r*n1; cvh51 w+rvh ztacjo0bmare suddenly turned off, while trav5v hz1t 2*,bc;rrvo*h 0amj1qnnc+ wyeling in empty space, the starship will

  A rocket moves through empty spa v.3 t+h qk3mqxud3i2vce in a straight 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 rocketm3vh.+k u t vdqqix233 in order to sustain its motion is

  You are standing in a moving bus, facing forward, and you suddenlyo+1)byg3 awzloh3z:a3dw kq,h,b8 fy fall forward. You can imply from this that the 1za3, +ky 8gwqafhb3dhy ,oob zl:)w3bus's

  You are standing in a moving bus, bl+owa rg:otng5/ +- rvv kv5.facing forward, and you suddenly fall forward as the bus comes to an immediate s tb kvag r o:g+wn+5r./lov-v5top. What force caused you to fall forward?

  A constant net forceqv3y)z 5g r ojoqwlhka)*) w00 acts on an object. Describe the motion of the object.

  The acceleration of an object7( 67yn,gx9hbkrgh a0tl7 nzc,p tyk: is inversely proportional to

  A net force F accelerates a mass m with an acceleration a. If the same net foelzgs5 d9m((n ujz q18rce is applied to mass 2m, then the acceleration wz1 j(eulnz9(5g qm8ds ill be

  A net force F acts on a mass m and produces an acceleration a. What accelerat /jc(pu i0k2za3x2vrk 3rz+k u.q+nr uion results if a net force 2F acts on ma+xura (+ p2zuki3qv /2.zn rcr3kk0ujss 4m?

  If you blow up a balloon, an5 2-kd(j uopfwd then release it, the balloon will fly away. This is an i 5 -uw2(kdjfpollustration of

  Two cars collide head-on. At every moment u 9)f6v6 6isbrhgasl9during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts6 rsvb69 gfa sh6l9i)u on the first. This is an example of

  If you exert a force F on an object, the force which the object exert 4 e(wmkg6p,y bqinc h3lwfw4d*2- o)xs on you will*wkh,wml4 on)-xewf3di py bc6 42q(g

  Action-reaction force2ws/nyc- o5w8 ye kn:ds

  Action-reaction forces arewc:zq93bu*t llt f.0 r

  A 20-ton truck collidesz7cip dyd+- 4e with a 1500-lb car and causes a lot of damage to the car. Si+ezd4 -7cdp iynce a lot of damage is done on the car

  An object of mass m sits on a flat table. The Earth pulls o8h(u-x y8udvk6 1auxyn this object with force mg, which we will 6 dx -u8vyuuh y1x(ka8call the action force. What is the reaction force?

  A child's toy is suspended from tgzvd q2 itjag(j8)x8+v cs*e7he ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is jd8 cjt87v azgg ( 2+vx*)qiesthe "action force," what is the "reaction force"?

  Your bat hits the balc 6j,5sgwgxgl, e(3rwl pitched to you with a 1500-N instantaneous force. The ball hits the bat wwjsxgw,ce6l5r( 3,g gith an instantaneous force, whose magnitude is

State Newton's three laws.aur2sjr: 5vvp++0ci7nv: cea

  Mass and weight

  The acceleration due to gravity is lh 6vb84eftf ylhs f1;+ower on the Moon than on Earth. Which of the followintbfyf8 l+hv1 4hs6fe;g is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force 5 51basninxc2n no,l (which acts at a distance is

  Who has a greater weight to mass ratio, a person weighing 400-u, 7n+zedo4 ih.u gy uyd0kp- N or a person weighing 600 zuhy7u.n-du-o gk0,p4+ d ieyN?

  A stone is thrown straight up. At the top of its path, the net forf v1ky7sx3 gx 3t3u2gajlm *5sce acting on it 3mjfvls3 * 7u31sg txxg52akyis

  A 20-N weight and a 5.0-N weight are dr,glw*(vj/wg ib/ t9ryopped simultaneously from the same height. Ignore air resistance. Compare tbig(r /*w 9g,lwjv/y their accelerations.

  A brick and a feather fall to thee rgm(o/is 8.,uczf k) earth at their respective terminal velocities. Which obero(k / ,8f.)isg czmuject experiences the greater force of air friction?

  An object of mass m is hanging by a sty2b,.5yuju ei ring from the ceiling of an elevator. The elevator is moving up at constji,.y eu5b2y uant speed. What is the tension in the string?

  An object of mass m is hanging by a strin 6 rj/tuyo5d7vg from the ceiling of an elevator. The elevator is moving upwyd t76vj/u r5oard, but slowing down. What is the tension in the string?

  The force that keeps yobf.9k; 8a : gc.u)mg drt,pahlq7(rjuu from sliding on an icy sidewalk is

  It's more difficult to start moving a heavy carton 42;4df e cakh1+on xkjfrom rest than it is to keep pushing it with constant velocity4a; kcn12e4d kfhoxj+, because

  A horizontal force accelerates a box dy4o, rze /j/uchj7m1from 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. What happens to the bo y7e// zoc4ujdj1h,r mx's acceleration?

  A packing crate slides down an inclined ramp atuy,+f;, xclyve 2e 2we constant velocity. Thus we can deduce elye,,x;2c 2 v+ywe futhat

  A block of mass M slides down a frictiocn. 60p he-yb7f f7trunless plane inclined at an angle q with the horizontal. The normal r06e.ftcfu7n- r 7 hbpyeaction force exerted by the plane on the block is

  A block of mass M slidesxxd ju - onv).rh/i(3e down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane xh - drj(3e onxu/vi).on the block is directed

  A block of mass M slides down a frictionless plane inclined 1r/ px9vz.9xatq /wwz at an angle q with the horizontal. The gravita9 rwxz paz9.w//1x tvqtional force is directed

  Two toy cars (16 kg and 2.0 kg) are releasedaf (mh5y*2 3aj1ty(rg zr b/yt simultaneously on an inclined plane that makes 5fy(3*r htraajy1t2y /mbgz( 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 16-N force is applied to the g8 mb,-n9k g)kxbdy0a1p mg*gobject, and it accelerates kgbm,b)91g8*- xag dgnp y0mkat $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate fromzjpq 5,ax/,tlj0o.m/b b q. cz rest to 27 m/s in 7.0 s. What is5j0 pmb,b o/j cz.xq.lz /tqa, the average forward force on the car?

  Starting from rest, a 4.0-kg body reaches a speeo:-. kcu9v.2i pci l4 reowb1id of 8.0 m/s in 2.0 s. What is the net fcl4ce1w 2:ii.i vprko9-u .bo orce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquirzwv-tjz nh 50a *m36uku/9is6 zdae 4les a speed of 50.0 m/s after travelj5asz4 anhevmz6 *liuwd6z/ - 3u0t k9ing
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 a 10-kg masv h4dyi+,dru(di,x96r.x xizv 9q 5nos from re x9v+6didnxv,zrrhqx o9 ,4(5idi.yust,

  What is the mass of a person who weighs kx4xui25 rlcc w,zp)pc(h )n*hr*:lb 110 lb?

  What is the mass of an object that weighs 250 2r6cns)kmzq/ g9mc3wvd )1ms N on the surface of the Earth where the accrz9/qmdkw1ccns)2v sm63m )g eleration 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 object on tl4ebh28d xymth th:f43g; we)he surface of the Moon where the acceleration due to gravity is only 1/6 of that ;8 3 yxt2wflheb: hehm4g4d)ton the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 N on thex(7rydw;b4nmm,wq e0 kl,r9 kf cnp4* Moon. The Moon's gravity is one sixthfkr, p(9wbn4k7y0;dw4,ernlx cm* mq of Earth's. Compare the masses of the objects.

  Sue and Sean are havix5 6o 8 az,u:fyzmz mp+9dn7z zg kjeco1);-wing a tug-of-war by 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 toward Sue atox6ai f5zcj;:me u8g7k o1nzz zzd+y9p,mw -) $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F 5dnjqu e12 frzubtel5j 9 .:5kacts on the stack, anddujfj.enl:kzr5t92 bqe 1 55u 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 tbsc)8p c:/ 5pw vrw0jfhe scale be reading when the elevatp0jfbcsrw5v wc/: )p 8or is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the hf/lbisjq 3jf9-rj ,0person is 60.0 kg q9jfj0bh s,jf-/li 3rand 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 personaw 0lt.kq. us;cy1 -gq is 60.0 kg and the elevator accelerates upw1 0aq;q .ys .gwtkluc-ard with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces actl.g p2t8mtsc ( on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a macpl 8( tgm.s2tgnitude 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 heucw e :kstg617ld in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is trav6cgt 7e :uswk1eling 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 is hfw+jp6lwf+( ield in place by metal brackets thapwj+( l ifw6f+t 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 = 0.60 kg and m = 0b go+ge 0id pp92sxn:4.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the x epid:b9 og n+4p2sg0mass of the pulley.)

  In the Atwood machine shownek6 u-3wdfoi-vr7 sd0 in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore fric -6-du037dvksifw eortion and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal flooz -t9 i8jhk s/:almx-dr with a force of 100 N iamh98k-x l t/: -idsjzn a direction 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 d jojv )6a 1*vzqi)mp0horizontal floor with a force of 100 Njd aivo)m 0qp16zj)v * 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?

  A traffic light of weight 100 N is supported by two ropes as show(t.ok8.fw g phn in Fig. 4-2. What are the tensions in the rope(f8o.gkhpw t.s?

  In Fig. 4-2, if the tensions in the ropes are 50 N, what is the mass of the trapll9.tbsw6 ryh 3hk9 0fficp9w3sb.yl6 9h0hlrtk light?

  Two boxes of masses woa1xt9oen ;w q+y0, fhxgv3: m and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of thvg0; we:w1fn o y +93ohqxtax,e more massive box?

  Two boxes of masses m and 2m are in chad,bb 49iqn9ontact with each other on a frictionless surface. (See Fig. 4-3.) Whai949abn ,hbqd t is the net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If thefdov 1js 0);ug forward force on the more massive box is F, what is the tension in the c01js) gf; vudoonnecting rope?

  Two boxes of masses m and 2m are connected by a rk)/qhik7m f,a ope. (See Fig. 4-4.) If the fo/, fam)kikq7h rward 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 F pk4 p637z7tobqwq6ljig. 4-5. Box Ip zlp7o 4 t6k7qb3q6wj 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 an9ybkalny44 br:* )lgud kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is aula:9y*ylkb bng4 4r )pplied to the box?

  The coefficients of static and kineticom.79ggpp 2w n frictions for plastic on wood are 0.50 and 0.40, pnmpw27.9g og
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 slofw qdd 9;7;9ya 0a2i9 emvgwbrws and comes to a stoad;bim9d9w efya 9q;7grv 2 w0p 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 pulled by a 5.0-N fosd:raqh +(xd 5rce. A 3.0-N friction force retards the mox:hr s5+(ddaq tion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from restkrn4lav s+se9 85ptl a*d)op7, 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 in)y:c h2ek mtb*u -pgv5oy-j;q.m4d gc itial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kh)c:j5dmot 4eggq u p2vb-mc y-y;k.*inetic friction between the puck and the ice?

  During the investigation of a traffic acc8v m fc +u4-.xf)dxezdident, police find skid marks 90.0 m long. They determine the coefficienufd)z- x 4cfdemxv.+8 t 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 applied.

  Two boxes of masses m and 3m are st)ze ub96* nolvhmmh 32acked. (See 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 mm b2em6 vuhhz)39no*l assive 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 surfa5a x/bjh tx05qce between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the lesxq0bthaj/ x5 5s 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 7hzj.s1la hh+inclined at an angle os7hhaz .1j+hlf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an u0 or,mdu15moqfob , :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 rf)fepfj 39e hs e4/v3angle 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 tilted at an anrjtfh,hki4.*hrxk:n i3 a13 j z. n(qdgle 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 dowj qrhz-. 3b./4 wfq lctaijv;8n an inclined plane, at a constant velocity of 6.0 mr4fcz8vjq/bt-i ;h3.ljwq a. /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 n,cj i (sqs3 jo22psg3a 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 down a roug3(y syywz b2gxp .dq; 6-owi,do-3 mlrh $37^{\circ}$ 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*wrb6 f cc6s:dxppas3*oa4j6; /ggn g 500 N along a rough surface. The cable attached to the log m 3f/wc*xgo*an46 bs6jgp6c: s gd;parakes 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 i e9;k;vppdb njp/vsn2- i06rwnclined plane tilted at an angle ofp p0viv6n2; ;bkn9rp/j edws- $33.5^{\circ}$ 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 ppof dro 45- vs)-y-ysincreased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the objecpf-r sd5- pv o)s-yo4yt and the plane?