What is a flywheel?

A co-worker has a car that's the make/model my brother is looking for, she says the flywheel might be the reason its just sitting in her yard right now, not going anywhere. (She's not even sure what a flywheel is or does.) What's a flywheel & what does it do? The car is an 1985 Bonneville. ... show more A co-worker has a car that's the make/model my brother is looking for, she says the flywheel might be the reason its just sitting in her yard right now, not going anywhere. (She's not even sure what a flywheel is or does.)

What's a flywheel & what does it do?

The car is an 1985 Bonneville.

Thank you.
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