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RESISTANCE

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์ €ํ•ญ (Resistance) ? ์ €ํ•ญ (Resistance)์ €ํ•ญ์ด๋ž€, ์ „ํ•˜์˜ ์ด๋™์„ ๋ฐฉํ•ดํ•˜๋ฏ€๋กœ ์›ํ™œํ•œ ํ๋ฆ„์ด ํ˜•์„ฑ๋˜์ง€ ์•Š๊ฒŒ ์ œํ•œํ•˜๋Š” ๊ฒƒ.์ฆ‰, ์–ด๋–ค ๋ฌผ์ฒด์— ์ „๋ฅ˜๊ฐ€ ํ๋ฅผ ๋•Œ, ์ด ์ „๋ฅ˜์˜ ํ๋ฆ„์„ ๋ฐฉํ•ดํ•˜๋Š” ์š”์†Œ๋ฅผ ์ €ํ•ญ์ด๋ผ ํ•œ๋‹ค.โ€ป ์ „๋ฅ˜๋Š” ๋‹จ์œ„ ์‹œ๊ฐ„๋‹น ์ „ํ•˜์˜ ์–‘์ด๋‹ค.์ด๋Š” ์ „๊ธฐํ•™ ๊ด€์ ์—์„œ ๋ฐ”๋ผ๋ณธ ์ €ํ•ญ์ธ๋ฐ, ๋ฌผ๋ฆฌํ•™ ๊ด€์ ์—์„œ์˜ ์ €ํ•ญ์€์œ ์ฒด ์†์„ ์šด๋™ํ•˜๋Š” ๋ฌผ์ฒด์— ์ž‘์šฉํ•˜๋Š” ํž˜์ด๋ผ๊ณ  ํ•œ๋‹ค.์œ ์ฒด(ๆต้ซ”) ์†์„ ์šด๋™ํ•˜๋Š” ๋ฌผ์ฒด์˜ ํ‘œ๋ฉด์—๋Š” ์••๋ ฅ ์™ธ์— ์ ์„ฑ(็ฒ˜ๆ€ง) ๋•Œ๋ฌธ์— ๋งˆ์ฐฐ๋ ฅ์ด ์ž‘์šฉํ•˜๋Š”๋ฐ, ๊ทธ ํ•ฉ๋ ฅ(ๅˆๅŠ›)์œผ๋กœ ๋‚˜ํƒ€๋‚˜๋Š” ํž˜์—์„œ ์šด๋™์„ ๋ฐฉํ•ดํ•˜๋Š” ์„ฑ๋ถ„์„ ์ €ํ•ญ์ด๋ผ๊ณ  ํ•œ๋‹ค.โ€ป ํ•ฉ๋ ฅ(resultant force)์€ ๋‘˜ ์ด์ƒ์˜ ํž˜์ด ๋™์ผํ•œ ์ž‘์šฉ์„ ๋ฌผ์ฒด์— ๋ฏธ์น˜๋Š” ํ•˜๋‚˜์˜ ํž˜์ด๋ผ ํ•œ๋‹ค. (ํž˜์˜ ๋ฌด๋ฆฌ๋ฅผ ๋ฒกํ„ฐ ํ•ฉ์„ฑํ•œ ๊ฒƒ) โ€ป ์ ์„ฑ(viscosity)์€ ์œ ์ฒด์˜ ํ๋ฆ„์— ๋Œ€ํ•œ ์ €ํ•ญ์„ ๋งํ•œ๋‹ค...

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