Transcript Energy
Energy
Chapter 4 sect 1
What is Energy?
Energy
is anything that has the
ability to cause change
– Anything that changes must have
energy
– Energy causes changes
Kingdome
Different Forms of Energy
Electrical-Anything
powered by
electricity
Chemical-Stored in chemical bonds
– Examples-Food, anything flammable
Thermal-Sunlight
– Includes light and heat energy
Sound-You
stereo
can feel the bass from a
Kinetic Energy
Energy in the form of motion
– Anything that is moving has KE
Kinetic energy depends on the
mass and velocity of an object
– More mass=More KE
– More velocity=More KE
Calculating Kinetic Energy
To
calculate KE use the following
formula
– KE=½mass x velocity2
– Do not forget your units
Mass=Kg
Velocity=m/s
Acceleration=m/s2
Kinetic
Energy=Joules
Potential Energy
Energy
that is stored within an object
– Energy can be stored because of the
objects position
– Energy can be stored because of the
physical or chemical make up of the
object
There
are 3 types of potential Energy
Types of potential energy
1. Elastic potential energy
Energy that is stored by something
that can return to its original shape
Example-Rubber band, racquet ball
Types of Potential Energy
2. Chemical potential energy
Energy stored with in the chemical
bonds of an atom
Energy is released when bonds are broken
Glucose in human body is broken down to
provide us with energy
Items that are flammable allow chemical
bonds to be broken easily
Large amounts of chemical bonds breaking
Types of Potential Energy
3. Gravitational potential energy Energy that is stored by objects above
the earths surface
Example
Calculating GPE
Gravitational potential energy
depends on two things
1. The mass of the object
2. How high the object is off the
ground (its height)
To find GPE use following formula
GPE(j)=mass(Kg)x9.8m/s2 x height (m)