How do we measure gravity?

How do we measure gravity?Thanks to Newton, gravity is a measurable force. Not coincidentally, the international standard unit of force is called a Newton (N). On Earth’s surface, roughly 0.98N equals the downward force of gravity on 100 grams of mass.

Likewise, one kilogram of mass exerts a downward force of 9.8N. To calculate the force of gravity, physicists use the formula f = ma (force = mass x acceleration).

Since the acceleration of gravity is 9.8m/s2 on Earth – ie little g – we can easily calculate the Newton force of any mass. The average person’s mass is 70 kilograms, which multiplied by 9.8 gives you 686N – the force by which gravity keeps us all securely grounded.

Video: Vortex cannon

Watch the chaps over at Bang Goes the Theory test the power of a real-world vortex cannon against a series of increasingly strong structures.