IGCSE Physics Equations

Resultant Force

Mass X Acceleration

Density

Mass / Volume

Velocity

Displacement / Time

Acceleration

Change in Velocity / Time

Work Done

Force X Distance moved

Kinetic Energy

0.5 X Mass X Speed squared

Gravitational Potential Energy

Mass X Gravity X Height gained

Pressure

Force / Area

Pressure in Fluid

Height X Density X Gravity

Weight

Mass X Gravity

Acceleration from v/t graph

Gradient

Distance from v/t graph

Area under graph

Moment of a Force

Force X Distance to Pivot

Equilibrium (not accelerating and not turning)

Resultant force and resultant moment are both zero

Falling Object (no air resistance)

loss of GPE = Gain of KE

Power

Energy Transferred (Work Done) / Time taken

Momentum

Mass X Velocity

Conservation Of Momentum

Momentum Before = Momentum After

Force

Change of Momentum / Time

Boyle's Law (Temp Constant)

Pressure X Volume is Constant (P1V1 = P2V2)

Energy to Change Temperature of a material

Mass X Specific Heat X Temp. Change

Wave Speed

Frequency X Wavelength

Frequency

1 / Time Period

Refractive Index (angles)

sin i / sin r

Critical Refraction Angle

RI = 1/sinc

Total Internal Reflection

When light meets a boundary with faster medium at an angle greater than the critical angle

Current

Charge / Time

Resistance

P.D (Voltage) / Current

P.D. (Voltage)

Energy / Charge

Resistors in Series

R = R1 + R2

Resistors in parallel

R = (R1 X R2) / (R1 + R2)

Electrical Power

P.D. (Voltage) X Current

Electrical Power (No V)

Current Squared X Resistance

Transformer (A.C. Only!!!)

Turns ratio = Voltage ratio

Power of a Transformer (100% efficient)

Vp X Ip = Vs X Is

Hooke's Law

Force = spring constant x extension