Question

Two points about changes involves energy. Can u answer me please.

Answer 1

Melting of ice is a change. Heat is requied to melt ice. Heat is a form of energy. When you tear a paper, your body uses some energy. Tearing of a paper is a physical change. Some changes produce energy. When fuels burn, they undergo a change. They produce heat, light and few other substances. Heat and light are forms of energy. Energy is involved wherever a change occurs