Formula

Question 1

Period

Answer 1

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

Question 2

Average Speed

Answer 2

Total distance(m)/total time(s)

Question 3

Acceleration

Answer 3

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

Question 4

Resultant Force (F)

Answer 4

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

Question 5

Weight

Answer 5

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

Question 6

Density

Answer 6

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

Question 7

Moment

Answer 7

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

Question 8

Work Done

Answer 8

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

Question 9

Kinetic Energy

Answer 9

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

Question 10

Gravitational Potential Energy

Answer 10

G.P.E(J) = Mass(kg) × g × height(m)

Question 11

Power

Answer 11

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

Question 12

Pressure

Answer 12

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

Question 13

Speed of wave

Answer 13

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

Question 14

Frequency

Answer 14

f(Hz) = 1 / Period(s)

Question 15

Electromotive Force

Answer 15

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

Question 16

Potential Difference

Answer 16

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

Question 17

Current

Answer 17

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

Question 18

Resistance

Answer 18

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

Question 19

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

Answer 19

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

Question 20

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

Answer 20

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

Question 21

Power use of Potential Difference

Answer 21

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

Question 22

Energy

Answer 22

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

Question 23

Gravitational Field Strength

Answer 23

10N/kg
10m/s^2

Question 24

Density of water

Answer 24

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

Question 25

Speed of light in Vacuum

Answer 25

3.0 × 10^8 m/s

Question 26

Speed of sound in air

Answer 26

330m/s