18.03.2020

Тема:Тертя. Сила тертя.

https://docs.google.com/file/d/0BzZ2z9Zf1g8WX1hXV3g1a3ZKaW8/viewhttps://sites.google.com/a/marschool64.net/fizika-7-klas/2-semestr/urok-no-34/videododatok