What is Gravity?
- Gravity is the force of attraction between all masses, which can be seen on big scales. For example, our solar system is held together my gravity. Also, blackholes are a GREAT example and source of gravity.
- Gravity can be seen through the way that things accelerate towards the ground. If you throw a ball up in the air, it will fall back down to the floor and accelerate.
- Gravity changes in different places around the universe. On Earth, g = 9.8N but scientists round this number to 10N as it is easier to use in calculations. In space, g = 0N .
- Gravity gives everything a weight.
What is Weight and Mass?
- Weight and mass are NOT the same thing.
- The mass of an object is the stuff that it is.
- The weight of an object is the mass being pulled by gravity.
- As there are different gravitational forces around the universe, your WEIGHT can change if you go to a different plant, but your MASS won't.
- Mass is measured in kg.
- Weight is measures in N.
Calculating Weight, Mass or Gravity
This is probably one of the easiest formula triangles out there. All you need to bear in mind are the units - Gravity is N/kg! Let's go straight to an example:
Eg: Calculate the weight of G-Dragon (my music crush >.<) on the moon, where gravity is 1.6N/kg and on the Earth, where gravity is 10N/kg if G-Dragon's mass is 60kg.
On Earth:
Weight = Mass x Gravitational Field Strength
Weight = 60 x 10 = 600N
On the Moon:
Weight = Mass x Gravitational Field Strength
Weight = 60 x 1.6 = 96N
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