A whale slapping its tail on the surface of the water is usually simply called a tail slap. This is quite common among whales when socializing or after being disturbed. It may be a form of play or communication, or an attempt by the whale to stun its prey by making a loud noise and creating pressure waves.
The Tail Slap or Tail Lob is what you are describing.
The meaning of this behavior is not really known, it has been suspected to mean it is a way to ward off other whales, or to invite other whales to join a group.
When a whale jumps out of the water it is called breaching.
tail-slapping.
Breaching.
Swings at the beach
Swings
It is called a "thurible" or "censer."
Something
Strokes.
Mood swings can be stopped by medicines called 'mood stabilizers'. Examples- lamotrigine, lithium, sodium valproate, carbamazepine.
Are called "buffers"
An inside pitch
I don't know the name of it, but it does exist....I have it, too!
If you mean the time it takes to swing from start to finish (top to top) this is called the period and if it is the number of swings per second this is know as the frequency.
The length of the string has nothing to do with the number of swings. Itdetermines the time that each swing takes. That has no connection withthe number of swings, unless you're in a hurry and can't wait around.
An online site which is available for everyone to buy affordable tire swings, ranging from $100 up, is called swingset. They offer different types of tire swings, and cost varies from types.