Transcript Kinetic and Potential Energy

Kinetic and Potential
Energy PG 61
Potential Energy…
•Energy that is stored
energy.
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
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..
Examples of Kinetic Energy…
• Shooting a rubber
band.
• Water falling over
the fall.
• A Yo-Yo in motion.
• Releasing the arrow
from the bow.
•Pendulums &
Skateboarders
Potential and Kinetic Brainpop
• BPOP Quiz
Maximum Kinetic energy
(Your choice)
Maximum Potential
energy
(Your choice)
KE and PE Part 2 – MATH!
• A unit to measure
Energy is
• Joules (J)
To find how much potential
energy something has you need
to determine 3 factors
• M = Mass (Kg)
• H = Height (m)
• G = Acceleration of gravity(m/s2)
• G on Earth is 9.8 m/s2
• We will make it 10 m/s2
Formula
• Gravitational PE(GPE) =
•= mgh
• Practice Quiz
Gravitation PE = mgh
• What is the
potential energy of
a 3-kilogram potted
plant that is on a 2
meter-high plant
stand?
3 times 2
times 10 =
60 J
m times g =
Newtons (N)
Newtons is units for Force
• What is the
potential energy of
a 10-newton book
that is placed on a
shelf that is 2.5
meters high?
• 10 times 2.5 = 25J
KE MATH
• You need to know 2 things
• M- Mass in kg
• V – velocity (Speed) in m/s
Formula
•KE = ½
2
MV
• What is the kinetic
energy of a 3kilogram ball that is
rolling at 2 meters
per second?
•
2
½(3)(2)
½(3)(4)
•
½(12)
•
6J
•
•Practice Sheet