Formula Flashcards

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1
Q

Period

A

2π√ Length(m)/Gravitational Field Strength(N/kg)

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2
Q

Average Speed

A

Total distance(m)/total time(s)

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3
Q

Acceleration

A

(Final Speed - Initial Speed) / (Final Time - Initial Time)

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4
Q

Resultant Force (F)

A

Force(N) = Mass(kg) × Acceleration(m/s^2)

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5
Q

Weight

A

Weight(N) = Mass(kg) × Gravitational Field Strength(N/kg)

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6
Q

Density

A

P(kg/m^3) = Mass(kg) / Volume(m^3)

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7
Q

Moment

A

Moment(Nm) = Force(N) × Perpendicular distance(m)

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8
Q

Work Done

A

Work Done(J) = Force(N) × Parallel Distance(m)

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9
Q

Kinetic Energy

A

Kinetic Energy(J) = 1/2 × Mass(kg) × Velocity^2

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10
Q

Gravitational Potential Energy

A

G.P.E(J) = Mass(kg) × g × height(m)

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11
Q

Power

A

Power(Watt) = Work Done(J) / Time(s)
Power(Watt) = Energy(J) / Time(s)

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12
Q

Pressure

A

Pressure(Pa) = Force(N) / Area (m^2)

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13
Q

Speed of wave

A

Speed(m/s) = Frequency (Hz) × Wavelength (m)
v = fλ

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14
Q

Frequency

A

f(Hz) = 1 / Period(s)

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15
Q

Electromotive Force

A

Electromotive Force(V) = Work Done(J) / Charge(C)
e = Energy(J) / Charge(C)

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16
Q

Potential Difference

A

P.D(V) = Work Done(J) / Charge(C)
P.D(V) = Energy(J) / Charge(C)

17
Q

Current

A

I = Q/T
Current(A) = Charge(C) / Time(s)

18
Q

Resistance

A

Resistance(Ω) = Potential Difference(V) / Current(A)

19
Q

Amount of Current, Potential Difference and Effective Resistance in a series circuit

A

Current(I) = I1 = I2
Potential Difference(V) = V1 + V2
Reff = R1 + R2

20
Q

Amount of Current, Potential Difference and Effective Resistance in a Parallel circuit

A

Current (I) = I1 + I2
Potential Difference (V) = V1 = V2
1/Reff = 1/R1 + 1/R2

21
Q

Power use of Potential Difference

A

Power = Potential Difference(V) × Current(I)

22
Q

Energy

A

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

23
Q

Gravitational Field Strength

A

10N/kg
10m/s^2

24
Q

Density of water

A

1.0g/cm^3
1000kg/m^3

25
Q

Speed of light in Vacuum

A

3.0 × 10^8 m/s

26
Q

Speed of sound in air

A

330m/s