Physics: Energy

Energy Types of Energy Potential energy Kinetic energy The ability to do work Shown by: – Application of force – Movement of something by that force. Force Push or pull more • More acceleration = _____ force more • More mass = _____ force Force = mass X acceleration F = ma Energy Work = force x distance (W = F x d) Measured in Joules: –N (unit of force) combined with with M (unit of distance). Potential Energy Stored energy: fuel –Energy that can be burned ____ a battery –Chemical energy stored in _______ –Energy stored in food as ______ sugars –Energy from height above the earth’s surface ________________ gravitational energy Gravitational Energy • Due to the attractive gravitational force between all objects in the universe • Near Earth’s surface the force due to gravity is 9.8 m/s/s Gravitational Energy W=Fxd gPE = mgh m = mass of the object g = gravitational force 9.8 m/s/s h = height above the surface of the earth Kinetic Energy Energy due to motion depends on: mass – _____ of the object speed – ______ of the object More connected to speed than mass: KE = ½ mv2 m = mass v = speed Conservation of Energy • Energy can’t be created or destroyed • Can change from one form to another • Examples: – Fuel burning makes ____ heat light – Battery makes ____ – Use gravity to make ______ motion