Forms, Nature, Properties:
-Light travels in straight lines until it is reflected, refracted or absorbed.
-Heat can produced in many ways.
-Heat can move objects by conduction
-Electricity in circuits can produce light, heat, sound and magnetic effects
-Magnets attract and repel each other and other materials.
-Energy is a property of many substances.
-Energy is transferred in many ways
-Heat moves from warmer to cooler
-In most chemical and nuclear reactions, energy is transferred
-The sun is a major source of energy for Earth.
-Waves can transfer energy such as sound, seismic and light.
-Electromagnetic waves result when a charged object is accelerated. Examples are radio waves, microwaves, infrared, ultraviolet, visible
-Each kind of atom can gain or lose energy only in particular discrete amounts.
-Wavelengths of emitted radiation can be used to identify the substance.