4.2a Everyday events involve one form of energy being changed to another.
animals convert food to heat and motion
the Sun s energy warms the air and water
4.2b Humans utilize interactions between matter and energy.
chemical to electrical, light,and heat: battery and bulb
electrical to sound (e.g., doorbell buzzer)
mechanical to sound (e.g., musical instruments, clapping)
light to electrical (e.g., solar-powered calculator)