KidzSearch - Safe Search Engine
web image video

more

facts wiki news games kidztube apps

Propulsion is the use of force to make movement.

For ground propulsion the first instrument was the wheel.

For water propulsion pole, paddle, oar and sail have been used. Nowadays the most common types are underwater propellers. Sails are still common, and historically represented the most important form of early propulsion for large ships.

For air propulsion, the most common types are propeller and jet engine. Others have been used experimentally.

 view more...









report a search problem

home contact us settings advertise terms/privacyabout usteacher forum

desktop version
Powered by Google SafeSearch
Copyright 2005-2021 KidzSearch.com