What is a sheet or web supported by springs in a metal frame and used as a springboard?

Answer

A sheet or web supported by springs in a metal frame and used as a springboard is called a trampoline.

What is a trampoline?

A trampoline is a piece of equipment which allows people, especially children to jump up and down as a sport. A trampoline is made up of large piece of strong cloth held by springs in a** frame**.

Hence, a sheet or web supported by springs in a metal frame and used as a springboard is called trampoline.