CONTACT FORCE: carrying backpack, drinking water out of a water bottle , making a bed, NONCONTACT FORCE: water flowing from ocean, leaves falling from tree, wind blowing, NORMAL FORCE: vase sitting on a table, banana on a plate, pencil on a sheet of paper,

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

استعادة الحفظ التلقائي: ؟