No, the penguin in "Happy Feet" did not start tap. Long ago, people tapped their feet to the wood. That is how tap started.
Tap your feet means moving your feet in a beat. Tap dancing is used with Tap shoes and that's probably where tap your feet comes from.
Tap feet, nod head, tap fingers, sing along
Tap dance is where you are wearing 'tap shoes' which have got two metal slabs, one on the heel, and one on the toe. You move your feet to the beat, and your feet tap. There are some very difficult moves in tap.
Because your tapping your feet!
Probably because of you tap your feet to get the sounds.
No it's not
According to the NEC motor tap conductors shall not exceed feet in length?
tennis shoes tap shoes (for tap dancing)
absolutely
no, but the dance and ampd' can tap their feet.
Tap dancing was created because not all people had the access to live music or musical instruments, so by putting taps or pieces of metal to their feet they could produce a sound and entertain.