An object in motion stays in motion (and an object at rest stays at rest).
Sir Isaac Newton said this first, and not about writing. Still, writing is a natural act, possibly a force of nature, and is just as subject to physics as everything else. Applied to your writing, the “object” in question is the work you are producing. (Be it understood that we’re not talking here about writing as the mere act of putting words on paper; rather, we’re talking about writing that is becoming a finished work.) Applied to a work in progress, then: your writing both requires and benefits from momentum. Let’s break out those two key bits.
Requires momentum. Any piece of writing of any substantive length—short story, novella, novel, screenplay, stage play, epic poem, etc.—cannot continue forward unless you work on it regularly. Long works have many threads and themes, schemes and schemas, and other moving parts that need to be fresh in mind while writing. This is not to say you can’t take a break from a work; breaks can be good for your writing. But just try to finish a novel that you write in fits and starts, or even one that you write regularly but overly-spaced, such as writing it only on the weekends. It’s hard enough without adding that complexity.
Benefits from momentum. When you are working on a project regularly and with momentum on your side, your writing is likely to be more efficient and perhaps also better. Consider: the longer it has been since you last worked on your project, the longer it will take to: a) bring all the components back into your head; b) have a good sense of what to write next; and c) maintain all the voices: yours, and those of your characters. When your work has momentum, you slip easily between characters, you have your story threads and themes in mind, you know what has and has not transpired, and you know—this is important—what to write next.
Robert Heinlein provided these and some other rules of writing. The emphases are his:
1. You must write.
2. You must finish what you start.
My Immutable Law of Writing #1 (“the words aren’t going to write themselves”) echoes RH’s first rule. My second supports his second: if you mean to finish, you must finish. And you do this by respecting (or, if you prefer, taking advantage of) the laws of physics.
Here are three pieces of practical advice for keeping momentum.
1. Write something you love.
Don’t select a writing project because you think it’s trendy or easy to get published or will make you tons of cash. Write a story that you truly want to tell. That love will feed your momentum. You will write because you have to see how it comes out. (This will also sustain you later when you are in the eighth round of revisions and you hate the book more than you have ever hated anything.)
2. Make the forces (even the negative ones) work for you.
Fully expressed, Newton’s First Law is: “An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force” (italics mine).* There are throughout your non-writing world “unbalanced forces” that conspire against you and your writing, even if (usually) unintentionally, almost all of which come down to commitments that require your time: jobs, partners, children, sleep, lawns that insist on growing, and so on. How might you make these forces work in support of your writing?
Perhaps: Use lawn mowing time as thinking time, for working out plot points and other story details; car pool to work so that you can write while someone else drives; enlist your family members as co-conspirators, to help by doing research or editing; establish family creative time: while you write, others practice their instruments, or blog, or fold origami, or what have you; get up 30 minutes earlier (you won’t miss it) and write 500 words while there are no distractions; or quit something that you’ve been meaning to quit, something that takes up your time, transferring that time to your writing.
3. Allow your self occasional breaks from the project.
Short ones. Take Sunday off, maybe, but then back to it on Monday. Can’t fight physics, might as well make it work on your behalf.