Momentum (noun)

1. The quantity of motion of a moving body, measured as a product of its mass and velocity.
2. The force or energy that allows something to continue or to grow stronger or faster as time passes.

Origin:

Late latin momentum, from latin, movement, from movēre to move.

Examples:

1. The car had a lot of momentum and was difficult to stop.
2. The team had built up a lot of momentum and was on a winning streak.
3. The company's success was due in large part to the momentum of its early growth.
4. The project lost momentum and was eventually abandoned.
5. The economy has gained momentum and is now growing at a faster rate.