Isaac Newton's second law of motion is one of the most universally recognised equations of all time, possibly second only to e=mc^2. Using this beautiful formula, we can deduce exactly why objects of different masses will accelerate towards the earth at the same rate during free-fall. It gets a bit mathsy, but stick with it.

This video couldn't have been filmed without the help of Mattie McDonagh of the YouTube channel Swish. I hope you will all hop over to his channel and subscribe:    / swished  

@TheKnowBox

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Hammer/Feather Drop (Original Video):    • The Hammer and the Feather  

Veritasium's 'Misconceptions about falling objects':    • Misconceptions About Falling Objects  

More On Newton's Second Law: http://www.physicsclassroom.com/class...

http://teachertech.rice.edu/Participa...

https://en.wikipedia.org/wiki/Newton%...

Swish:    / swished  

Knowledge Box:    / alexjoconnor  

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Twitter: @TheKnowBox