The power button is usually called a "start" button. For as long as you hold it down, it provides power to the motor. When the motor gets up to speed, centrifugal force holds the switch closed for you. This is why a quick (short) opening of the door will not stop the dryer and a quick press of the start button will not start the dryer.
This, however, does not explain the noise...
The motor turns a belt which wraps (sort of) around a pulley which is on a spring (and also around the drum). The spring should hold tension on the belt, but the belt should not be so resistive (drum refuse to turn) to cause the tensioner to strike anything.
Can you turn the drum by hand?
The drum rides on two wheels. They should roll smoothly.
:o).
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