4/27/10
Post date: Apr 27, 2010 7:1:26 PM
Bell Ringer: What does it mean to say that energy is conserved?
Conservation of Energy Notes
Energy cannot be created or destroyed, only transferred between objects and between forms
Types of energy:
PE (gravity)
KE (movement)
heat
light
sound
chemical (bonds between atoms)
nuclear (forces within the nucleus of an atom)
Energy changes between these forms to allow ANYTHING to happen
Ball rolls down a ramp: PE to KE (and heat from friction)
Person moving: Chemical (from food) to Kinetic
To solve problems, set energy at one time equal energy at a later time
Identify which types of energy will be present at each moment (may be more than one at a time)
Replace energy types with equations for energy
Fill in all known variables and solve for the unknown.
Page 230: 9-12 due tomorrow