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KhaleesiDog t1_iugv8rt wrote

Reply to comment by Skusci in ELI5: Newton's third law by AppropriateFeeling44

It flexes at the point of impact.

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Terravash t1_iuhdmlo wrote

Given the density of a standard wall (assumed concretish) vs a tennis ball, surely you'd be going smaller than a micrometer to measure flex.

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TheJeeronian t1_iuhxav4 wrote

Our walls here are usually drywall with supporting wooden studs. The flexure is invisible but easily measured

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