The piston is least affected by pressure changes when near which positions?

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Multiple Choice

The piston is least affected by pressure changes when near which positions?

Explanation:
When a cylinder’s pressure changes, it acts on the piston to move it, and how far the piston actually moves depends on its speed at that moment and its inertia. At the ends of the stroke—the top dead center and the bottom dead center—the piston is momentarily at rest, so its velocity is zero. With zero velocity, even noticeable pressure changes don’t translate into much displacement because the piston lacks momentum to carry the motion and the crank mechanism briefly resists further movement. That’s why the piston is least affected by pressure changes when it’s near the top or bottom of the stroke. In contrast, near mid-stroke the piston is moving fastest, so pressure fluctuations produce a more pronounced response.

When a cylinder’s pressure changes, it acts on the piston to move it, and how far the piston actually moves depends on its speed at that moment and its inertia. At the ends of the stroke—the top dead center and the bottom dead center—the piston is momentarily at rest, so its velocity is zero. With zero velocity, even noticeable pressure changes don’t translate into much displacement because the piston lacks momentum to carry the motion and the crank mechanism briefly resists further movement. That’s why the piston is least affected by pressure changes when it’s near the top or bottom of the stroke. In contrast, near mid-stroke the piston is moving fastest, so pressure fluctuations produce a more pronounced response.

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