Why does the moon revolve around the earth?

It just moves forward. The moon isn’t stationary. It has inertia and no atmosphere in space to slow it down. It just goes. As it moves forward, the gravity of Earth tugs on it and it falls, but because it’s moving forward it misses Earth as it falls and goes around, again and again. That’s... Continue Reading →

We know gravity keeps the Moon in orbit. Why is there no gravity on the ISS?

This is an image of Newton’s Cannon. Given a high enough elevation, shooting a canon-ball at increasing velocity will cause it to travel further and further until it just goes into orbit, falling around the earth. That is what’s happening inside the ISS. It’s called free-fall - the same as Newton’s canon-ball. The ISS is falling toward... Continue Reading →

Unfriended

Rationalthinking101.com is my blog and whenever I post to it, like now, it's setup to share my post both on Twitter and Facebook. Since I live in Texas, I'm in the Trump Bible Belt. I've got friends here and I work for the state, but in a recent survey I discovered most of my Texan... Continue Reading →

If you fire a gun vertically from the earth’s surface, but there is no friction, would it return to earth?

Yes it would return to Earth. The escape velocity for Earth is more than 11 km per second or 33 times the speed of sound. This is about 9 or 10 times faster than a rifle bullet. So even without air friction the bullet’s going to go up, gradually slow down, and fall. The problem... Continue Reading →

The Little Rocket that Was

Let’s revisit Sir Isaac Newton’s cannon. In the above mentioned article we had placed a level on the cannon and shot the cannonball at 1440 feet per second parallel to the ground until it fell and bounced and rolled and came to a stop. We didn’t want to shoot it up in the air in... Continue Reading →

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