A vibration is a motion that cannot make up its mind which way it wants to go.
The law of gravity says no fair jumping up without coming backdown.
Someday we may discover how to make magnets that can point in any direction.
What is one horsepower? One horsepower is the amount of energy it takes to drag a horse 500 feet in one second.
Water freezes at 32 degrees and boils at 212 degrees. There are 180 degrees between freezing and boiling because there are 180 degrees between north and south.
There is a tremendous weight pushing down on the center of the Earth because of so much population stomping around up there these days.
We say the cause of perfume disappearing is evaporation. Evaporation gets blamed for a lot of things people forget to put the top on.