Quiz: Remember the definition of mal de mer?

first law of motion

noun, Physics.
See under law of motion.

law of motion

noun, Physics.
any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion) the law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces (second law of motion) or the law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force (third law of motion or law of action and reaction)
Also called Newton's law of motion.
1660-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for first law of motion
  • Newton's first law of motion is exhibited by the pendulum, albeit with the effects of the second law and his law of gravitation.

Word of the Day

Difficulty index for first law of motion

Few English speakers likely know this word

Word Value for first

Scrabble Words With Friends