Ch 9 Energy Sec 1 What is Energy

Ch. 9 Energy Sec. 1 What is Energy?

Energy • energy - the ability to do work or cause change • Everything around you has energy! – any time a change occurs energy is transferred from one object to another – ex. you hear a footstep b/c energy is transferred from the foot hitting the ground to your ear

Energy • energy can exist in different forms energy e. Ne. Rg. Y Energ. Y ENERGY ygrene • energy can be converted from one form to another Energ. Y → energy (ex. sunlight [light energy] warms a pool of water [heat energy])

Main Forms of Energy kinetic energy potential energy thermal energy chemical energy radiant energy electrical energy nuclear energy

Main Forms of Energy •

Main Forms of Energy •

Main Forms of Energy •

Main Forms of Energy • sound energy - caused by an object’s vibrations – Form of mechanical energy – string stores potential energy -> you pluck the string -> string now has kinetic energy

Main Forms of Energy • thermal energy (heat energy) - the total kinetic energy due to the motion of the particles (molecules) that make it up – all objects have thermal energy, which increases as their temp. increases

Main Forms of Energy • chemical energy - energy of a compound that changes as its atoms are rearranged – Form of potential energy – when chemicals are broken apart, such as during digestion, chemical energy is released

Main Forms of Energy • light energy (radiant energy) - energy carried by an electromagnetic wave – Produced by the vibrations of electrically charged particles – can be absorbed, transmitted, or reflected • absorbed light… gives objects warmth (radiant energy thermal energy) • reflected light… gives objects color

Main Forms of Energy • electrical energy (electricity) - energy carried by electrons flowing in currents from batteries & wall sockets – electrical energy is usually made by burning fossil fuels in power plants (chemical energy → electrical energy)

Main Forms of Energy • nuclear energy - energy in the nucleus of an atom – like chemical energy, it can be converted into electrical energy

What types of energy are shown below? Kinetic & Thermal

What types of energy are shown below? Chemical, Thermal, & Radiant

What types of energy are shown below? Kinetic, Electrical, Radiant, & Thermal