Physics
What is momentum? Conservation of momentum and recoil
Momentum is mass times velocity (speed in a set direction): p = mv, in kilogram metres per second (kg m/s). When no outside force acts, th...
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System Design
Strategy Pattern Explained With a Real Python Example
The strategy pattern hands one changeable step to a separate object. The code around it keeps the steps that never change, and calls one s...
Geography
Why do cyclones spin? How hurricanes form
Cyclones spin because the Earth spins. Air rushes in towards the low pressure at the centre of the storm, and the Coriolis effect bends it...
Maths
Section formula and distance formula: don't swap m and n
The section formula gives the point P between A(x₁, y₁) and B(x₂, y₂) with AP : PB = m : n. It is x = (mx₂ + nx₁) ÷ (m + n), and likewise ...