Final answer:
Stars spin faster when they collapse due to the conservation of angular momentum and the material collapsing into a disk.
Step-by-step explanation:
Stars spin faster when they collapse due to the conservation of angular momentum. As a collapsing nebula shrinks in size, it spins more rapidly, just like a figure skater spinning faster when she brings her arms in tight to her body. This is because, according to the law of conservation of angular momentum, a rotating body spins faster as it decreases in size. The faster spin rate is also influenced by the material collapsing into a flat disk revolving around the central object, similar to how planets in our solar system orbit the Sun.