http://en.wikipedia.org/wiki/Inertial_navigation_system
Submarines use inertial navigation. Given a known initial point such as a port location the sub departsfrom, by measuring acceleration continuously change in speed anddistanced can be calculated. Acceleration is integrated twice yielding change in distance.
A simple accelerometer is a small masson a spring. You are in a closed car on a train at rest in a ation.The spring is horizontal to the floor of the car and pointed in thedirection of travel. As the train accelerates out of the station in astraight line the mass compresses the spring. Knowing the spring constant and the mass, acceleration can be determined from Force =Mass * Acceleration. From acceleration distance from the station cane calculated without seeing outside the train. if the train slowsdown the spring is stretched instead of compressed. Using three accelerometers distance traveled in 3D can be determined.
Amazing what you can do with a littlecalculus. No need to quibble over meaning of words. Speed and velocity are interchangeable. unambiguously defined as meters per second.
http://physics.nist.gov/cuu/Units/units.html
Submarines use inertial navigation. Given a known initial point such as a port location the sub departsfrom, by measuring acceleration continuously change in speed anddistanced can be calculated. Acceleration is integrated twice yielding change in distance.
A simple accelerometer is a small masson a spring. You are in a closed car on a train at rest in a ation.The spring is horizontal to the floor of the car and pointed in thedirection of travel. As the train accelerates out of the station in astraight line the mass compresses the spring. Knowing the spring constant and the mass, acceleration can be determined from Force =Mass * Acceleration. From acceleration distance from the station cane calculated without seeing outside the train. if the train slowsdown the spring is stretched instead of compressed. Using three accelerometers distance traveled in 3D can be determined.
Amazing what you can do with a littlecalculus. No need to quibble over meaning of words. Speed and velocity are interchangeable. unambiguously defined as meters per second.
http://physics.nist.gov/cuu/Units/units.html
'...speed, velocity | meter per second | m/s...' |