Recent content by justx007

I know that in a hydraulic system, oil is used rather than water because water can easily vaporised under extreme use. What the is the advantage/s of using oil over air in a hydraulic system?

How about "GCSE O-Level Physics" for Beginners from www.beginnerphysics.net. It should be simple but useful for the O-Level students.

Let say a weighing machine is brought to the Moon. If an astronaut weighs 70 kg on Earth, will the machine shows 70 kg on Moon? By right it should because mass is always constant? But I am not sure. Just like if a man is 60 kg at the Equator, will the same weighing machine...

I already learned about Newton's Third Law but nowhere in my reference book can I find Newton's First and Second Law. Surely there must be the First and Second Law before the Third Law is taught. What is Newton's First and Second Law about ?