equation of motion

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noun

an equation describing the rate of change with time of the velocity of a body, a collection of particles, or a fluid.

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IS and ARE are both forms of which verb?

Origin of equation of motion

First recorded in 1850–55

I wonder what that lady is doing now, and if she knows what she set in motion with Archer?
‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS|Marlow Stern|January 8, 2015|DAILY BEAST
The Dallas Cowboys sell out their state-of-the art football stadium.
Will Texas Stay Texan?|David Fontana|December 29, 2014|DAILY BEAST
We happily hoist our egg nog in the air, embrace each other, and raise our out-of-tune voices in song.
The Most Confusing Christmas Music Lyrics Explained (VIDEO)|Kevin Fallon|December 24, 2014|DAILY BEAST
DISH delivers a one-of-a-kind entertainment experience to every room of your home, wirelessly.
Four TV Shows We Can’t Wait to Return In 2015|DISH|December 22, 2014|DAILY BEAST

The train was already in motion as she tried to step inside, and her body was crushed beneath it.
Riding Thailand’s WWII Death Railway|Liza Foreman|December 21, 2014|DAILY BEAST
In this situation we waited the motion of the enemy, without perceiving any advancement they made towards us.
The Life and Most Surprising Adventures of Robinson Crusoe, of York, Mariner (1801)|Daniel Defoe
These sections also have vibrations of their own which are of shorter length and more rapid motion.
Expressive Voice Culture|Jessie Eldridge Southwick
Felipe watched over her as a lover might; her great mournful eyes followed his every motion.
Ramona|Helen Hunt Jackson
At six o'clock I felt once more the welcome motion of a Railroad car, and at eight was in Venice.
Glances at Europe|Horace Greeley
The first jolt had like to have shaken me out of my hammock, but afterwards the motion was easy enough.
Gulliver's Travels|Jonathan Swift