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# Fizika i dizanje tegova - Lazar Radenković

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15. godina "Odeljenja za fiziku", NNB10
30-31. mart 2018

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### Fizika i dizanje tegova - Lazar Radenković

1. 1. Fizika i dizanje tegova Lazar Radenković, Ljubiša Nešić PMF Niš
2. 2. Bench press
3. 3. Šta je lakše podići?  4 x 15 kg  12 x 5 kg
4. 4. Dijagrami sila
5. 5. „Čista“ translacija 𝑁1 + 𝑁2 − 𝑊 = 𝑚𝑎 𝑁2 𝑙 𝑔 − 𝑁1 𝑙 𝑔 = 0 Rešenje: 𝑁1 = 𝑁2
6. 6. Translacija i rotacija 𝑁1 + 𝑁2 − 𝑊 = 𝑚𝑎 𝑁2 𝑙 𝑔 cos 𝜃 − 𝑁1 𝑙 𝑔 cos 𝜃 = 𝐼𝛼. Rešenje: 𝑁1 = 1 2 𝑚 𝑔 + 𝑎 − 𝐼𝛼 𝑙 𝑔 cos 𝜃 𝑁2 = 1 2 𝑚 𝑔 + 𝑎 + 𝐼𝛼 𝑙 𝑔 cos 𝜃
7. 7. Objašnjenje 𝑁2 = max 𝑁2 = 1 2 𝑚 𝑔 + 𝑎 + 𝐼𝛼 𝑙 𝑔 cos 𝜃 𝐼 𝑏 > 𝐼 𝑎 ↓ 𝑎 𝑏 < 𝑎 𝑎 , 𝛼(𝑏) < 𝛼(𝑎) ↓ 𝑡 𝑏 > 𝑡 𝑎
8. 8. Physics of Powerlifting L. Radenković Lj. Nešić European Journal of Physics https://doi.org/10.1088/1361-6404/aaa90e Hvala na pažnji. Pitanja? lllazarrr@gmail.com