물리량

  

Physical Quantities

	Quantity	Definition	Formula	Units	Dimensions
M E C H A N I C A L                                                                           ___	Length or Distance	fundamental	d	m (meter)	L (Length)
	Time	fundamental	t	s (second)	T (Time)
	Mass	fundamental	m	kg (kilogram)	M (Mass)
	Area	distance2	A = d2	m2	L2
	Volume	distance3	V = d3	m3	L3
	Density	mass / volume	d = m/V	kg/m3	M/L3
	Velocity	distance / time	v = d/t	m/s	L/T
	Acceleration	velocity / time	a = v/t	m/s2	L/T2
	Momentum	mass ×velocity	p = mv	kg·m/s	ML/T
	Force   Weight	mass ×acceleration mass ×(accel. of grav.)	F = ma W = mg	N (newton) = kg·m/s2	ML/T2
	Pressure or Stress	force / area	p = F/A	Pa (pascal) = N/m2 = kg/(m·s2)	M/LT2
	Energy or Work   Kinetic Energy   Potential Energy	force ×distance mass ×velocity2 / 2 mass ×(accel. of grav.) ×height	E = Fd KE = mv2/2 PE = mgh	J (joule) = Nm = kg·m2/s2	ML2/T2
	Power	energy / time	P = E/t	W (watt) = J/s = kg·m2/s3	ML2/T3
	Impulse	force ×time	I = Ft	N·s = kg·m/s	ML/T
	Action	energy ×time momentum ×distance	A = Et A = pd	J·s = kg·m2/s	ML2/T
A N G U L A R                                                 ___	Angle	fundamental	θ	˚(degrees) or rad (radians) 360˚= 2π rad	dimensionless
	Cycles	fundamental	n	cyc (cycles)	dimensionless
	Frequency	cycles / time	f = n/t	Hz (hertz) = cyc/s = 1/s	1/T
	Angular Velocity	angle / time	ω = θ/t	rad/s = 1/s	1/T
	Angular Acceleration	angular velocity / time	α = ω/t	rad/s2 = 1/s2	1/T2
	Moment of Inertia	mass ×radius2	I = mr2	kg·m2	ML2
	Angular Momentum	radius ×momentum (mom. of inert.) ×(ang. vel.)	L = rp L = Iω	kg·m2/s	ML2/T
	Torque	radius ×force (mom. of inert.) ×(ang. accel.)	T = rF T = Iα	N·m = kg·m2/s2	ML2/T2
T H E R M A L ___	Temperature	fundamental	T	˚C(celsius) or K (kelvin)	K (Temp.)
	Heat	heat energy	Q	J (joule) = kg·m2/s2	ML2/T2
	Entropy	heat / temperature	S = Q/T	J/K	ML2/T2K
E L E C T R O M A G N E T I C	Electric Charge (+/-)	fundamental	q	C (coulomb)	C (Charge)
	Current	charge / time	i = q/t	A (amp) = C/s	C/T
	Voltage or Potential	energy / charge	V = E/q	V (volt) = J/C	ML2/CT2
	Resistance	voltage / current	R = V/i	Ω (ohm) = V/A	ML2/C2T
	Capacitance	charge / voltage	C = q/V	F (farad) = C/V	C2T2/ML2
	Inductance	voltage / (current / time)	L = V/(i/t)	H (henry) = V·s/A	ML2/T2
	Electric Field	voltage / distance force / charge	E = V/d E = F/q	V/m = N/C	ML/CT2
	Electric Flux	electric field ×area	φE = EA	V·m = N·m2/C	ML3/CT2
	Magnetic Field	force / (charge ×velocity)	B = F/qv	T (tesla) = Wb/m2 = N·s/(C·m)	M/CT
	Magnetic Flux	magnetic field ×area	φM = BA	Wb (weber) = V·s = J·s/C	ML2/CT

Mass, energy, momentum, angular momentum, and charge are conserved, which means the the total amount doesn't change in an isolated system.

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거리(길이)［m］, 시간［s］ , 질량［kg］

 

속도［m/s］=거리［m］/시간［s］     *거리(위치의 변화)

속력(속도의 크기)

가속도［㎨］=속도의 변화［m/s］/시간［s］

운동방정식 ; 힘［kg×m/s² ］=질량［kg］×가속도［m/s² ］

                     ［kg×m/s² ］=［N］(뉴턴)

운동량［kg×m/s ］=질량［kg］×속도［m/s］

충격량［N×s］=힘［N］×시간［s］

         ［N×s］=［kg×m/s² ×s］=［kg×m/s ］

일［N×s］=힘［N］×거리［m］

   ［N×s］=［kg×m² /s² ］=［J］(줄)

운동에너지 ;［kg×m² /s² ］=1/2×질량［kg］×(속도)²［(m/s)² ］

                 ［kg×m² /s² ］=［J］(줄)

 

            

 

참고