# Rocket Acceleration ![two liter bottle rocket launches](/static/courses/ucp-science/rocket-acceleration/blast-off-header.jpg) The Earth exerts a gravitational force on all objects. A rocket must have a force greater than gravity to lift off. This force, acceleration, can be measured with a @boardname@ in 3 different directions or as a combined force of all three. A rocket made from a two liter soda bottle is made as a test vehicle to measure changes in acceleration as it lifts off and falls back to the earth. ## Contents * [Overview](/courses/ucp-science/rocket-acceleration/overview) * [Build](/courses/ucp-science/rocket-acceleration/build) * [Setup and procedure](/courses/ucp-science/rocket-acceleration/setup-procedure) * [Resources](/courses/ucp-science/rocket-acceleration/resources)
| | | | |-|-|-| | Adapted from "[Rocket Acceleration z Radios](https://drive.google.com/open?id=1IyhCPdYQevKh3kHNgukSxlgdvZIKuzmIBjLSRnFS36o)" by [C Lyman](http://utahcoding.org) | | [![CC BY-NC-SA](https://licensebuttons.net/l/by-nc-sa/4.0/80x15.png)](https://creativecommons.org/licenses/by-nc-sa/4.0/) |