reveiw2 - ~ v r = ~ v 2-~ v 1 where v r is relative...

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Review for Exam 2. 1. Unit IV. (a) scalar : magnitude, ex) mass, length, speed, distance, . .. (b) vector : magnitude+direction, ex) displacement, velocity, acceler- ation, force . .. (c) addition of two vectors i. component method : ex) ~ A = (2 . 0 , 3 . 2), and ~ B = (3 . 0 , - 2 . 0). ~ A + ~ B = (2 . 0 + 3 . 0 , 3 . 2 + ( - 2 . 0)) = (5 . 0 , 1 . 2) ii. head and tail method, perallelogram method ex) ~ C = ~ A + ~ B ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ± - 6 ~ A ~ B ~ C ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ± - ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' * ~ A ~ B ~ C (d) rectangular and polar coordinate - 6 x(E) y(N) ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡± 10 10 . . . ... ... ... 45 o ~ A = (10 , 10), rectangular coordinate ~ A = ( 10 2 + 10 2 ,N 45 o E ), polar coordinate speed = distance time , velocity = displacement time = Δ d Δ t SI unit of velocity(speed) : [ m/s ] 1
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(f) acceleration acceleration = Δ v Δ t SI unit of acceleration : [ m/s 2 ] (g) constant velocity motion - 6 t(s) d(m) ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ slope = velocity = d 2 - d 1 t 2 - t 1 d = vt (h) constant acceleration motion ex) free fall - 6 t(s) v(m/s) ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ slope = acceleration = v 2 - v 1 t 2 - t 1 v = at - 6 d(m) t 2 (s) ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ slope = 1 2 a d = 1 2 at 2 (i) relative velocity ex) boat problem, Highway problem
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Unformatted text preview: ~ v r = ~ v 2-~ v 1 where v r is relative velocity of object 2 with respect to object 1. 2 2. Unit V. (a) gravity Gravitational force = mg , where g is gravitational acceleration. ( g = 9 . 8 m/s 2 ) SI unit of force : [ N ]=[ kg m/s 2 ] (b) Newtons 1st Law (c) Newtons 2nd Law ~ F = m~a (d) Newtons 3rd Law : Action-reaction 3. Unit VI. (a) Work W = ~ F ~ d = F || d = Fd || where F || is the component of force parallel to the displacement. SI unit of Work and Energy : [J] = [N m] = [ kgm/s 2 m ] = [ kg ( m/s ) 2 ] (b) Kinetic Energy K . E . = 1 2 mv 2 (c) Potential Energy(gravitational potential energy) P . E . = mgh (d) Energy Conservation Law : K.E. + P.E. = constant. TotalEnergy = 1 2 mv 2 + mgh = constant (e) Power P = W t 3...
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reveiw2 - ~ v r = ~ v 2-~ v 1 where v r is relative...

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