Physical principle whose equation explains the changes in this puzzle's theme entries

Question:

Answer:

NEWTONSSECONDLAW

Length:

Similar Crossword Questions:

Nickname for the three-letter abbreviation hidden in this puzzle's theme entries
This puzzle's theme entries, e.g.
Office building problem that's a hint to this puzzle's theme entries (see their last three letters)
Gym gear hidden in this puzzle's theme entries
First of a pair of letters swapped six times in this puzzle's theme entries
What this puzzle's theme entries have
Like fish for fish & chips -- or this puzzle's four theme entries
Just making things up, or a synonym for a three-word phrase describing this puzzle's theme entries
Where to find the theme entries of this puzzle, briefly
What this puzzle's theme entries are
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Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)
Second of a pair of letters swapped six times in this puzzle's theme entries
What each of this puzzle's theme entries contains
The three of this puzzle's theme entries
Challenged, or what the theme entries in this puzzle should be
What the three theme entries in this puzzle are, in either of two ways
There's one at the beginning of each of this puzzle's four theme entries
What this puzzle's theme entries probably do?
Levels that are split in this puzzle's theme entries
It can follow the last word of this puzzle's theme entries
What are featured in the theme entries of this puzzle
People who bring you this puzzle's theme entries
"Infections" inside this puzzle's theme entries
Word hidden in this puzzle's theme entries