Which of Newton's laws best explzhjxx v4rcm g 7:s:+-y9mmu3/s ae1 tkains why motorists should buckle-up?

  When you sit on a chair, the resultant force on you i/ju/r(,ax yvps

  In the absence of an external force, a moving b qnrip53; 8j1;xvz dbobject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are sx1rez23mn u/p1 s jj1*6 krlbouddenly turned off, while travelizr/ j b xlo 3s*mpnuk12erj116ng in empty space, the starship will

  A rocket moves through empty space in a m9qpdbuz-6; ystraight 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 rocket inmp 9yudzqb-6; order to sustain its motion is

  You are standing in a moving bus,mk,a:k( oejzj 7; awqy2):xw g facing forward, and you suddenly fall forward. You can imply from this that the bus'j a2 :wk j;7:g)kxy,q(womeazs

  You are standing in a movingezu/. o d*v2sj bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forsujz .v oe2d/*ward?

  A constant net force acts on an object. Describe the motion ozatl66r8d d75tok l)b4 0(nw cmfcvd1f the object.

  The acceleration of adv ;9d-u-1g2 mh:g8v tsl9mui qog8 ihn object is inversely proportional to

  A net force F acceleratesh fdl h02;e(s;xgc e.o a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration wo( csh;e 2.hl;ed0gf xill be

  A net force F acts on a mass m and produces an acceleration a. Wrne3rhpy /* dei .y 9a;(6hjazhat acceleration results if ;ariy.ey 39nd/h he( rza*pj6a net force 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon wi;4ek hnf4vqjt7/*:l s ppgrp*ll fly away. This is an j 4 ;*7p*4prsvqghnep/:tfklillustration of

  Two cars collide head-on. At every moment during the collision, the magnitude or.s-1s dcwds6f the force the 1cs.sdw -sr6d 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 example of

  If you exert a force F on an object, the force which the object exerts on you7xpvylal -a6z;r jg bx*ls2// wiy 6vr*jz;bxal2g pa-l// xls 7ll

  Action-reaction forcesfjqv i +o0 dhp8tv*eyu/d1k:4

  Action-reaction forces arimm5b4; ygeh (e

  A 20-ton truck collides with a 1500-lb car and ca.d,g+i6l9g3agp ndd rmppo8 8,.emn wuses a lot of damage to the car. Since a lot of damage is done on the cpd.mnrw id8p dp,lg,om3e n9ga.+6g8 ar

  An object of mass m sits on a flat table. The Earth pulls on this o2oy dxcspc;m jb inzg82w 14/+bject with forcg1 zo; i4wypd+x8cmcnb2 /2sje mg, which we will 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 purebmx*so.ycnxt 26;z u . ix+v 2i)*nells downward on the toy with its weight force of 8.0 N. If this i2en; *.b+ itxvy.ioznucx 6 2msx* )ers the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you w/nol xi1cee); ith a 1500-N instantaneous force. The ball hits the bat withloe/ie1cx;n ) an instantaneous force, whose magnitude is

State Newton's three l:h /mp 9 bts:q1mxa3x;d-sygsaws.

  Mass and weight

  The acceleration due to gravity is lmd1, x e7wwsc,ower on the Moon than on Earth. Which of the following is true about the mas,d1c 7,wxms ews and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a dist j)rmkbv :(runoib- 29ance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weig )ma-0(yhucgbcg(z 2g *(gnnzhing 600g 2y0-nzguzg*(a c(gc bh)nm( N?

  A stone is thrown straight up. At the top of its patf.+0e psaj;lk h, the net force acting on .a ;f+ejs0 lpkit is

  A 20-N weight and a 5.0-N weif/m0ltu gs(-f ght are dropped simultaneously from the same height. Ignore air resistance. Compare theirf / -ls0t(fgmu accelerations.

  A brick and a feather fall to the earth at their respel aflq1t0apy 9. l11ls(apow(,jy f)rctive terminal velocities. Which object experiences the greater force y 9aw.) q1 rp1l fsa(0(aly l1l,tpojfof air friction?

  An object of mass m is hanging by a string from the ceiling of an eibx 2iam p8m5,levator. The elevator is moving up at constant speed. What ipam28 im5i,bx s the tension in the string?

  An object of mass m is hanging by a string l- hp ybf8*cii qu2x(:(wv.l kfrom the ceiling of an elevator. The elevator is moving upwa(p fc82*l.ukqvxi:-bhw i(l y rd, but slowing down. What is the tension in the string?

  The force that keeps you from sliding on an icyxm -;+e cyn.bwvq s*;p sidewalk is

  It's more difficult to stb: t6m/ csielr3 cu02part moving a heavy carton from rest than it is to keep pushing it with cmbrl: 0tsc23c/ieu 6 ponstant velocity, because

  A horizontal force accelerates a box frozcs u r xzyl.4ypp:)*4 74oik8esiqv +m 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)* qyu 7 y.zo:p4pslsxz8i i4rec4+k v horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity.vur 8jli 5vr9,sre d75 Thus we can deduce i8r,j5vu7l59ver rsd that

  A block of mass M slides down a frictionless plane inclined at ahs/ftbgq6ls 5 2yf;*yn angle q with the horizontal. The normal reactsh6 yfbl/yf*sq;25g tion force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane -bt kl0yy5admv-34 vninclined at an angle q with tv lyn53 d0t--y4av kmbhe horizontal. The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a frictionless plane incline7 26gne ia, qlq2bbhb.d at an angle q with the horiae2b6b2 l nq,7i .hbqgzontal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are re7f (.bx7h m ladzk(k:eleased simultaneously on an inclined plane thah7.kmf( kbzle x( da:7t makes 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,zv10 r go9xa1ng9ika . A 16-N force is applied to the object, and it accelerates at ga,x 991krazo gin0v1 $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate1d tdt x +1/uj3nya7of from rest to 27 m/s in 7.0 s. What is the average forward f1ta1+xfo u7y t/dd3 jnorce on the car?

  Starting from rest, a h1+bwj ;;hrci 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force actibc hir1;+w;hj ng on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s iq 2 ;.do(oukjup-n0 mafter ikm ;2uo 0nq.od pj-u(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 pus1hg+ j.0k;q2 znx fzjsh a 10-kg mass from resjj01znqz+x s2 hf. gk;t,

  What is the mass of a person who weighs 110 bg01+naz wa wzl)+2s dlb?

  What is the mass of an object that weighs ;1sq+vwqs, ld 250 N on the surface of the Earth where the acceleration due 1qlssv q;d +,wto gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of theje 1k0k1 b5v.0rx0hm)ifcmgn object on the surface of the Moon where the acceleration due to gravity is only 1/6 of .m0bfivnk00 k m1r5cghxj) 1 ethat on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 cs3.)oeryt6vl- f fu3N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the e - 3rfysc3v)t6.oful objects.

  Sue and Sean are having ,.tdze +b e ytaf5lh91a 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,zy15ft.lhbe + 9 eatd Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A d-iepzy,-j3x t p7h5lq4 g )ryforce F acts on the stack, and ip,)zt l73r4 y -yed xg-qi5pjht 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 in3.i9 miwx. wne an elevator. What will the scale be reading when the elevator .wwm9 x ini.e3is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass of the person is 60 ka6 1y myp3r/oc ji;7,oq,sc8b rk0uz.0 kg and the elevator accelerates d;rm38rup,0j / cciqa y 76z ybkkso,o1ownward 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. Ifq*tjzq 6i7 dt:stk0q, the mass of the person is 60.0 kg and t6jd:z tk q0sq*t, iq7the 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 5.0-kggsdb 3sc44 yb8j86nwm mass. One force has a magnitude of 8.0 N and is directed due norsnbb83 g84 4yscdm6jwth. 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 flatbehmxxt t2 l;5sb,d 3zq7 b)r;sad of a truck. It is held in place by metal brackets that can exert a;mtbbas;t2q3 5xr ds,l z7x)h maximum 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 is heldd0kb +izeazd 7)zr/g) in place by metal brackets thatzrzd a+z0) 7eikbd /)g 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 sho,u twkfg,* x1ewn in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of th*uwg t,1 kefx,e acceleration of the system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4rd23 qbh/ ahq-5cp/ ,ledojg,-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? e p5qdoghca2r ,q3-d /hj/,lb(Ignore friction and the mass of the pulley.)

  A student pulls a box of booksa9/jflv4 +fnp 69rynq on a smooth horizontal floor with a force of 100 N in a direction ofl6 f4jv+/nraqfp9n y9 $37^{\circ}$ 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 ong;l8st )qe.kd a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the bol.tk;g8 qd es)x and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N gy1y:ff j:pb+48pg le v2 fed5wtfv)* is supported by two ropes as shown in Fig. 4-2. Whpf8wy)f:e f1 y v5eg4v2db*:t g +plfjat are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are 50 N, u,6mal to /3dz3mzh.owhat is the mass of the traffic li h3 6.al zm,3/dmotozught?

  Two boxes of masses m and 2m are in contact with each other phtn6v-.pk 9 4dv /vqc 99mfqwon a frictionless surface. (See Fig. 4-3.) What is the accele n th.vwfpp/9vq9-q9d k vcm64ration of the more massive box?

  Two boxes of masses m and 2m are in contact with slp:0q lpc1o* each other on a frictionless surface. (See Fig. 4-3.) What is thl1s:*p0o pc qle net force on the more massive box?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.).av33p k tju1s If the forward force on the more massive box is F, what i uav p3j.kts31s the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. hsov6g j0 2)qe (See Fig. 4-4.) If the forward force on the more massive box is F, what is the a6)vg0he 2sqo jcceleration of the less massive box?

Two boxes are connected by a cord running ovetm (gx(/sz4b7 /cartk g1or6qr a pulley as shown in Fig. 4-5. Bo/(crra ktt74m6 g 1sozg/bq x(x 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 box and a desk(tzeha gke;t3ck +v ,u,5i9vh are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal e,k(ku tehga ;,39v i +hctvz5force is applied to the box?

  The coefficients of static and kinetic frictiwf 8qfq k97z7aons for plastic on wood are 0.50 and 0.408 q9wkqzaf 77f,
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 direcyu e7gf (0h8f8c elzv7tion. It slows and comes to a s 70elf 8c 7evzhfy(g8utop 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 forceflw :y8e tky7:i4uhfyju 4:,y. A 3.0-N friction force retards the motion. What is the acceleration of the object?y4t::yek:fwl4y ihuu78f,y j

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, at a 9+zg9tu+rdxcsmjn1*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 spee2tr i6+uqtz yb7 y6on*d of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of 6+o67 uz bqy2inrt* tykinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skid marks 90.0 m lo axy. nq8i;.kvng. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speex8a;.k. qiyv nd of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See F7prg4h nori3rsug1 9 ,0vp0y xig. 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 static fri0r piu r04gx psgo3n7r91 ,hvyction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fis)ld:y-k 3 ztxg. 4-6.) The surface between the more massive box and the horizontal surface is smszd-lt3 kxy): ooth 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 atna/j5n h0hb5i an angle ohj/55h 0n iabnf $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that mak1rrvdua f03n0gof:8 //b ijtqes 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 anqd5x3gx:,s p ugle 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 r0ek3jv)cal9e is .pmb9(1 zhplane 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 inclined plane, at a const ncdb3bpcr7 ;9ant velocity of 7p3c c rdb9b;n6.0 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 mg y +q)ke6ufq4 slides 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 slides down a ro*.z s gz)ihvt 0uq/qv0ugh $37^{\circ}$ 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 weibht7jd/f-g. kghing 500 N along a rough surface. The cable attached to the log makes an angle d/t jg k-hb7f.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 arb5)fib*op 7v rough inclined plane tilted at an angle of*fipo )b 7brv5 $33.5^{\circ}$ 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 gradualqsgfu4ku q0 -x6al/,a ly increu q ,xaglk0f6/ua q4-sased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?