What is it Like to Be In an Accelerating Spacecraft?

The International Space Station orbits the Earth at a height approaching 400 km, but this orbit degrades over time due to atmospheric drag. Periodically, then, the Station has to be boosted back into its nominal orbit. This is done by accelerating the craft  forwards (rather than upwards), so that it orbits the Earth a little bit faster, which widens its orbit. Boosts can be performed in different ways; either a craft (the ESA's Automated Transfer Vehicle, the Russian Progress resupply vehicle or, until recently, NASA's Space Shuttle) gives the Station a push when docked at the rear, or the Space Station's own engines on the Zvezda service module can be fired.

Here's what it's like to be inside the International Space Station during a boost: