Piston Question that I do not understand

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The discussion addresses a physics problem involving a block on a piston undergoing simple harmonic motion (SHM). The first part of the question asks for the amplitude at which the block will separate from the piston given a 1.0s period. The second part inquires about the maximum frequency for continuous contact if the piston has a 5.0cm amplitude. The original poster expresses confusion about the concepts of pistons and the conditions for separation. Clarification and solutions were eventually provided, resolving the initial uncertainty.
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[SOLVED] Piston Question that I do not understand

Homework Statement

A block rides on a piston that is moving vertically with simple harmonic motion.
(a) If the SHM has a period 1.0s, at what amplitude of motion will the block and piston separate?
(b) If the piston has an amplitude of 5.0cm, what is the maximum frequency for which the block and piston will be in contact continuously?

The attempt at a solution

I don't understand the question. What is a piston, what causes the block to separate, how do I start the question?
 
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