Final answer:
If Earth began to spin a bit faster, the primary consequence would be that days would get shorter, as the length of a day is determined by the time it takes Earth to rotate on its axis. The cycle of seasons is attributed to Earth's axial tilt and orbit, not its rotation speed.
Step-by-step explanation:
If Earth began to spin a little bit faster, the consequence would be that days would get shorter. The length of a day is determined purely by the time it takes for Earth to complete one rotation on its axis. The familiar cycle of the seasons is a result of the 23.5° tilt of Earth's axis and not the speed of rotation.
Thus, a faster spin would not affect the cycle of seasons directly, but rather just shorten the length of both the daytime and nighttime.
At the summer solstice, for example, the Sun is higher in the sky with its rays striking Earth more directly, leading to longer days and more intense heating. Conversely, during the winter solstice, the Sun's rays come in at a sharper angle and the Sun is visible for fewer hours, leading to colder conditions.
These phenomena are related to Earth's axial tilt and orbit around the Sun, not its rotational speed.