Formulas

Question 1

Average Speed

Answer 1

Average Speed = Distance ÷ Time

Question 2

Acceleration

Answer 2

Acceleration = (Final Velocity − Initial Velocity) ÷ Time

Question 3

Force (Newton’s Second Law)

Answer 3

Force = Mass × Acceleration

Question 4

Weight

Answer 4

Weight = Mass × Gravitational Field Strength

Question 5

Momentum

Answer 5

Momentum = Mass × Velocity

Question 6

Impulse

Answer 6

Impulse = Force × Time

Question 7

Work Done

Answer 7

Work Done = Force × Distance

Question 8

Kinetic Energy

Answer 8

Kinetic Energy = 0.5 × Mass × Velocity²

Question 9

Gravitational Potential Energy

Answer 9

GPE = Mass × Gravitational Field Strength × Height

Question 10

Power (Work)

Answer 10

Power = Work Done ÷ Time

Question 11

Efficiency

Answer 11

Efficiency = (Useful Energy Output ÷ Total Energy Input) × 100%

Question 12

Specific Heat Capacity

Answer 12

Energy = Mass × Specific Heat Capacity × Temperature Change

Question 13

Boyle’s Law

Answer 13

Pressure₁ × Volume₁ = Pressure₂ × Volume₂

Question 14

Wave Speed

Answer 14

Wave Speed = Frequency × Wavelength

Question 15

Frequency

Answer 15

Frequency = 1 ÷ Time Period

Question 16

Refractive Index (Angles)

Answer 16

Refractive Index = Sine of Angle of Incidence ÷ Sine of Angle of Refraction

Question 17

Refractive Index (Speeds)

Answer 17

Refractive Index = Speed of Light in Air ÷ Speed in Medium

Question 18

Critical Angle

Answer 18

Sine of Critical Angle = 1 ÷ Refractive Index

Question 19

Charge

Answer 19

Charge = Current × Time

Question 20

Voltage

Answer 20

Voltage = Current × Resistance

Question 21

Electrical Power

Answer 21

Power = Voltage × Current

Question 22

Power (Using Resistance)

Answer 22

Power = Current² × Resistance

Question 23

Energy Transferred

Answer 23

Energy = Power × Time = Voltage × Current × Time

Question 24

Resistance in Series

Answer 24

Total Resistance = R₁ + R₂ + R₃ + …

Question 25

Resistance in Parallel

Answer 25

1 ÷ Total Resistance = 1 ÷ R₁ + 1 ÷ R₂ + 1 ÷ R₃ + ...

Question 26

Transformer Equation

Answer 26

Output Voltage ÷ Input Voltage = Number of Output Turns ÷ Number of Input Turns

Question 27

Transformer Power (Ideal)

Answer 27

Input Voltage × Input Current = Output Voltage × Output Current

Question 28

Magnetic Force on a Conductor

Answer 28

Force = Magnetic Field Strength × Current × Length of Wire

Question 29

Alpha Decay

Answer 29

A nucleus loses 2 protons and 2 neutrons New element = Mass number − 4, Atomic number − 2

Question 30

Beta Decay

Answer 30

A neutron changes into a proton New element = Atomic number + 1, Mass number stays the same

Question 31

Energy-Mass Equivalence

Answer 31

Energy = Mass × (Speed of Light)²

Question 32

Orbital Speed

Answer 32

Orbital Speed = (2 × Pi × Orbital Radius) ÷ Time Period