kinetic and potential energy by amanda rinaldi. objectives you will be able to define and identify...
TRANSCRIPT
Kinetic and Potential Energy
By Amanda Rinaldi
Objectives• You will be able to define and identify
Kinetic and Potential energy.• You will be able to give examples of
the two forms of energy.• You will be able to explain how one
can transfer to the other.
Definition of Energy…
The ability or capacity to do work.
Measured by the capability of doing work:
potential energy or
the conversion of this capability to motion:
kinetic energy.
Potential Energy…
• Energy due to position or stored energy.
Measure by:PE= (weight) (gravity) (Height)
Potential energy is calculated by:The object’s weight, multiplied by the earth’s gravitational pull (9.8 m/sec sq), multiplied by the distance the object can fall.
Examples of Potential Energy:
Stretching a rubber band.. -Stores energy
Water at the top of a waterfall.. -Stores energy
Yo–Yo in held in your hand.. -Stores energy because of position
Drawing a Bow… -Stores energy because of position
• When the position of an object is altered it, creates Potential Energy.
• A yo-yo on the table, doesn’t have energy, but when picked up, it alters its position and now it has the ability (or potential) to do work.
• A bow doesn’t have the capacity to do work, unless it’s held at an elevated position.
Potential Energy Converted to Kinetic
Energy…
When stored energy begins to move, the object now transfers from potential energy into kinetic energy.
Standing still Running
Definition of Kinetic Energy…
The energy of motion.
Measured by:KE= ½ (Mass) (Velocity)
2
Kinetic energy is calculated by one half of the object’s mass,
multiplied by the object’s speed- squared.
Examples of Kinetic Energy…
• Shooting a rubber band.
• Water falling over the fall.
• A Yo-Yo in motion.
• Releasing the arrow from the bow.
Summary of What You’ve Learned..
Example using a coin:• Holding a coin in you hand, alters the
coins original position. • The coin has potential energy,
because it has ability to do work.• Dropping the coin in the bank,
changes the stored energy into motion.
• This transfers the coin’s energy from potential to kinetic energy.
Follow Up Activity…• You and a partner will
collect at least 10 objects.
• You will take these objects and test to see which has Potential and Kinetic energy or both.
• You will use a Microsoft program such as Excel or Word to make a chart or table organizing your data.
• Be creative with the objects you choose, and make sure you understand your results to present to the class.
Potential Energy
Kinetic Energy
Both
Example Example Example
Example Example Example
Example Example Example
Example Example Example
The End...