I've been trying to come up with a dad joke about momentum, but I just can't seem to get it going.
Why this joke works
Let the Pause Build Momentum
Keep this one moving like an ordinary sentence until the final phrase. A small pause after “momentum” gives listeners time to expect a serious problem, while a second pause before “get it going” lets the double meaning land. Resist adding a physics explanation afterward. The joke works because “momentum” shifts quietly from a scientific idea to the everyday feeling of getting started. A calm, mildly frustrated delivery usually earns a better groan than an exaggerated one.
A closer look
The Writing Problem Behaves Like an Object at Rest
The speaker reports an unfinished creative task and identifies momentum as its subject. “Get it going” normally means starting or making progress, but momentum requires motion: with zero velocity, an object has zero linear momentum. The phrase therefore describes both writer’s block and the missing physical condition. “Trying” suggests applied effort, yet the joke humorously withholds any force capable of changing its state.
Fact behind the joke
Linear Momentum Equals Mass Times Velocity
NASA defines an object’s momentum as its mass multiplied by its velocity. Momentum has both magnitude and direction, and in a closed system total momentum is conserved even as objects exchange it through interactions. A stationary draft has no physical velocity to multiply, while an idea “gaining momentum” is metaphorical. In mechanics, changing momentum requires an external force acting over time.