momentum

/Tag: momentum

What is inertia? Physics – Science

By |2018-05-31T11:49:29-07:00August 18th, 2017|Physics|

The bus is heavy, so it's hard to get it moving. A law of physics first suggested by the Uzbek scientist Ibn Sina about 1000 AD states that "an object at rest tends to remain at rest, and an object in motion tends to remain in motion." Scientists call these tendencies inertia. Inertia is a way of measuring [...]

How old is the Earth? – Astronomy

By |2019-05-22T11:28:46-07:00August 18th, 2017|Physics|

Earth from space: How old is the Earth? When did the Earth form? Like Mercury and Venus and the other planets that go around the Sun, the Earth probably formed a little more than four and a half billion years ago. (That's about 4,600,000,000 years ago.) What's the sun made of? How do planets form? All our physics articles What [...]

Black holes – Space science – Physics

By |2019-02-20T19:38:04-07:00August 17th, 2017|Physics|

A starry sky with the Milky Way galaxy (thanks to Bernd Nies) - there are probably black holes in there somewhere! What is a black hole? A black hole is a place in space where there is a huge amount of mass in a very small area. More about space What is mass? All our physics articles Why [...]

Acceleration – simple physics

By |2018-05-31T11:49:28-07:00August 17th, 2017|Physics|

Tegla Loroupe, Kenyan runner Acceleration is how much your speed changes in a certain amount of time. Picture yourself standing in front of your house. When you stand still, your acceleration is zero. When you begin to walk, your speed is changing - that's what acceleration is - it measures how fast your speed [...]

Newton’s First Law of Motion – Physics

By |2018-05-31T11:49:24-07:00August 17th, 2017|Islam, Physics|

Isaac Newton, mathematician and physicist About 1000 AD, in the Islamic Empire, Ibn Sina came up with the idea that an object moving in a vacuum would just keep moving forever without slowing down. But to prove this was always true, you'd need calculus, which hadn't been invented yet. In the 1700s, Isaac Newton figured out [...]

Ibn Sina (Avicenna) – Medieval Islamic medicine – Islamic Empire

By |2019-04-24T06:03:09-07:00July 27th, 2017|Islam, Science|

Where Ibn Sina came from: Uzbekistan Ibn Sina and the Samanids in Uzbekistan Ibn Sina (known to Europeans as Avicenna) was a scientist. He was born about 980 AD in the north-eastern part of the Abbasid Empire. That was in the kingdom of the Samanids. (It's modern Uzbekistan.) Who were the Samanids? Medieval Islamic science All our medieval Islam [...]

What is the strong nuclear force? Atoms and Physics

By |2018-04-16T23:47:52-07:00June 2nd, 2017|Physics|

Diagram of an iron atom The protons inside the nucleus of an atom all have a positive electrical charge, so they push away from each other. But the strong nuclear force pulls the protons together. As you might think from the name, the strong nuclear force is very strong. It is stronger than [...]