Formula Flashcards
Period
2π√ Length(m)/Gravitational Field Strength(N/kg)
Average Speed
Total distance(m)/total time(s)
Acceleration
(Final Speed - Initial Speed) / (Final Time - Initial Time)
Resultant Force (F)
Force(N) = Mass(kg) × Acceleration(m/s^2)
Weight
Weight(N) = Mass(kg) × Gravitational Field Strength(N/kg)
Density
P(kg/m^3) = Mass(kg) / Volume(m^3)
Moment
Moment(Nm) = Force(N) × Perpendicular distance(m)
Work Done
Work Done(J) = Force(N) × Parallel Distance(m)
Kinetic Energy
Kinetic Energy(J) = 1/2 × Mass(kg) × Velocity^2
Gravitational Potential Energy
G.P.E(J) = Mass(kg) × g × height(m)
Power
Power(Watt) = Work Done(J) / Time(s)
Power(Watt) = Energy(J) / Time(s)
Pressure
Pressure(Pa) = Force(N) / Area (m^2)
Speed of wave
Speed(m/s) = Frequency (Hz) × Wavelength (m)
v = fλ
Frequency
f(Hz) = 1 / Period(s)
Electromotive Force
Electromotive Force(V) = Work Done(J) / Charge(C)
e = Energy(J) / Charge(C)
Potential Difference
P.D(V) = Work Done(J) / Charge(C)
P.D(V) = Energy(J) / Charge(C)
Current
I = Q/T
Current(A) = Charge(C) / Time(s)
Resistance
Resistance(Ω) = Potential Difference(V) / Current(A)
Amount of Current, Potential Difference and Effective Resistance in a series circuit
Current(I) = I1 = I2
Potential Difference(V) = V1 + V2
Reff = R1 + R2
Amount of Current, Potential Difference and Effective Resistance in a Parallel circuit
Current (I) = I1 + I2
Potential Difference (V) = V1 = V2
1/Reff = 1/R1 + 1/R2
Power use of Potential Difference
Power = Potential Difference(V) × Current(I)
Energy
Energy(kWh) = Power (kW) × time(hour)
Important Note:
Power = Potential Difference × Current = I^2R = (V^2)/R
Energy = VIt = (I^2)Rt = (V^2)t/R
Gravitational Field Strength
10N/kg
10m/s^2
Density of water
1.0g/cm^3
1000kg/m^3
Speed of light in Vacuum
3.0 × 10^8 m/s
Speed of sound in air
330m/s
