Acceleration is a measure of how the speed of an object changes over time.
The more that something changes speed in a given time, the more we say it has accelerated. Once an object reaches a constant speed it is no longer accelerating.

Acceleration is measured in metres per second.

You can make a note of your observations using word processing software such as Word. Save your notes and keep a printout if you want to. You can compare your ideas with other students or your teacher.