Thursday, April 1, 2010

Gravitational force acting on your body at different places


Have you ever wondered what your weight is like on a different planet or place in earth?


This is what I am going to talk about today. Firstly, you need to know the difference between mass and weight. According to my Science teacher and some websites, weight is the amount of gravitational force acting on your body while mass is the amount of matter in your body. If you are on moon, your mass will be the same but your weight will change. That is because the amount of gravitational force on the moon is less that the earth. However, the amount of matter in you doesn't change so your mass will still be the same.


After looking at some interesting sites, I found out that we weigh heavier on the poles than on the equator. However, the difference is only less than 0.5%. If we are on mount everest, the force of gravity will be less. I couldn't find out why the force of gravity on mount everest is less but I think it is because we would be further away from the center of the earth. But, I did find out why we weigh heavier on the poles than on the equator. You weigh less at the equator because of a) greater distance from the center of gravity b) acceleration due to the rotation of the earth. The reason why you weigh more at either of the poles is because you are closer to the earth's center of gravity and there is no extreme rotation at the poles.


Using google to research, I found a fun website where you can type in your weight and get your weight on other planets. For example, if you weigh 40 kg on earth, you will weigh 15.1 kg on mercury, 36.2 kg on venus, 6.6kg on earth's moon and so on. This is the website: http://www.exploratorium.edu/ronh/weight/.


That is all. Bye.... :-) :0 :-D XD