Ishning maqsadi: Mayatnik tebranish davrining mayatnik ipi uzunligiga va og’ish burchagiga bog'liqiligini o'rganish hamda matematik mayatnik yordamida erkin tushish tezlanishini aniqlash. Kerakli asboblar: sharli mayatnik, sekundomer, o'lchash lentasi