Transcript summary of concepts

SUMMARY OF CONCEPTS: GPE = w x h or
GPE = mgh
•If h is doubled, the GPE is doubled.
If H is tripled, the GPE is also tripled.
•If speed (velocity) is doubled (2x), the Kinetic Energy
increases (4x or 22).
If speed (velocity) is tripled (3X), the KE increases 9x or 32.
• The GPE at the top changes to KE at the bottom.
KINETIC ENERGY
• The greater the speed the greater the
k.e. of the object
• The greater the mass of a moving
object, the greater the k.e. of the
object
POTENTIAL ENERGY
Ep or p.e. is the potential energy an
object has because of its height.
“The higher an object is lifted, the
greater its p.e.”
“The greater the mass of an object the
greater its p.e.”
the gain in p.e. = work done
Ep = W
Putting these formulae together:
Gain in Potential energy= work done lifting
Ep = W
= lifting force x distance lifted (height)
Ep = F x d (h)
= weight force x distance lifted
Ep = Fg x d (h)
(g = 10N/kg)
= mass of object x g x distance lifted
Ep = mgh
Law of CONSERVATION OF ENERGY
“Energy cannot be created
nor destroyed. Energy is
converted from one form to
another.”
CONSERVATION OF ENERGY
1-11 Lecture 11_ Work - Kinetic Ener.mp4
PE =
max
max
KE
WORK
put in can
increase
P.E.
can do
K.E.
WORK AND ENERGY
1. max PE
= max KE
2. Work = Energy
3. Work = PE gained = KE
Work = KE
AMUSEMENT
PARK PHYSICS
Applying potential and kinetic energy
Height
(h in
meters/m)
PE = m g h
E k = ½ m v2
ROLLER
COASTERS
http://www.funderstanding.com/K12/coaster/
http://phet.colorado.edu/en/simulation/e
nergy-skate-park