0

An attempt at making a perpetual motion machine.

28

According to the Principle of Conservation of Momentum, the expulsion of hot gases through the rear of rockets or air crafts will produce a large momentum in the opposite direction. The forward thrust of a jet engine enables the aircraft to move forward while the upthrust of a rocket engine enables the rocket to propel upwards..

12

The rotational motion of the earth is household knowledge. But what causes it?