Potential & Kinetic
Energy
Energy
• The ability to do work
• The ability to cause matter to move
• The ability to cause matter to
change
• Measured in joules & calories
Types of Energy
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Radiant (light, electromagnetic)
Nuclear (atomic)
Mechanical
Heat (thermal)
Sound
Chemical
Motion
Energy can travel in different
forms
• Light
• Sound
• Electricity
Energy can be divided into
two general categories:
• Potential
• Kinetic
Potential Energy
• Stored energy
• Energy of position
• The amount of usable energy
in a body at rest
• Sometimes called GRAVITATIONAL
POTENTIAL ENERGY
Potential Energy
• Can be calculated mathematically
• PE = (weight) (height)
• Weight=(mass)(gravity)
• Gravity= 9.8m/s2
Potential energy can be
increased by:
• Increasing height & mass
211 foot tall drop
43 feet high
Example
Kinetic Energy
• Energy of motion
• Energy an object has
because it is moving
Kinetic Energy
• Can be calculated mathematically
• KE = (mass x velocity2)/2
Kinetic energy can be increased
by:
• Increasing mass & speed
Let’s see
Example
Sing with me
Momentum
• measurement of mass in motion
• any object that is moving has momentum
• (mass)(velocity)=momentum