This is a lock from the school lockers and the parabola forms at the top of the lock.
This pictures shows a sandle from my house and the parabola is placed at the back of the sandal and above .
In this bridge the parabola is formed at the bottom.
Real life parabolas.(2013). In youtube. Retrieved from https://www.youtube.com/watch?v=OP1Ac_BNnyo
The swing forms the parabola at the seat. Swing Parabola. (2013). In thinglink. Retrieved from https://www.thinglink.com/scene/361238246820151297