Physics
10 Newton's second law examples in everyday life (F = ma)
Newton's second law says the resultant force on an object equals its mass times its acceleration: F = ma. You can see it every time y...
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Maths
Pythagoras Theorem Visual Proof: Why a² + b² = c²
Pythagoras' theorem says that in any right-angled triangle, a² + b² = c², where c is the hypotenuse (the longest side). The visual pr...
Maths
SOH CAH TOA: How to Know Which Trig Ratio to Use
To know which ratio to use, look at the two sides in the question: the one you know and the one you want. Label the sides from the angle ...
Geography
Why Do Earthquakes and Volcanoes Happen? Plate Tectonics
Earthquakes and volcanoes happen mostly where tectonic plates meet. Earth's rigid outer shell is broken into plates that move a few c...
Physics
How Do Rockets Work in Space With No Air? Newton's Third Law
A rocket doesn't push on air or on the ground. It pushes on its own exhaust gas. The engines throw hot gas out of the bottom, and by ...
Explains
How Does GPS Work Without Internet? It's All About Time
Yes, GPS works without internet. Your phone only listens to the atomic clocks on the GPS satellites overhead, 20,200 km up. Each signal s...