momentum

Moving fluid has momentum, and rapidly changing its velocity can create dangerous spikes in pressure.

We had momentum going into it and immediately started to lose that momentum because people thought we were closed for the season.

Instead of being absorbed, that sudden change in momentum creates a spike in pressure that travels as a shockwave through the pipe.

And I accidentally drop the ball, I can use the momentum from that mistake to grow it into something new.

Ben 5544477, I don't understand why there's big momentum shifts in tennis matches sometimes.

So, I'd say that's a big reason for the momentum shifts.

Next, you can increase the time over which the change in momentum occurs.