تسجيل الدخول

تسجيل

Friction

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  P-247

2025-11-22

406

There are many familiar examples of the heating effects of friction. The train of sparks that fly from a sleigh runner as it passes over a stone, and the sparks that come from a car wheel when the brake is applied, both show that great heat is generated by the friction; for the sparks are burning iron. The hands are warmed by rubbing. A match is set on fire by friction, and a piece of wood in a turning lathe is charred when the corner of another piece is held against it.