Covers the various sections relating to Mechanical Energy.
Includes notes from the textbook, as well as additional class, video and research information, diagrams and practice questions.
Applicable to all IEB Grade 12s.
Written by a 95% < student.
Gravitational potential energy:
The energy an object possesses due to its position relative to a reference point.
Ep = mgh
m - Mass of the object in kg
g - 9.8 m.s-2
h - Height above a reference point
Kinetic energy:
The energy an object has as a result of the object's motion.
1
Ek = 2 m.v2
m - Mass of the object in kg
v - Velocity of the object in m.s-2
Mechanical energy:
The sum of gravitational potential and kinetic energy at a point.
Em = Ep + Ek
The law of conservation of energy:
The total energy in a system cannot be created nor destroyed; only transformed from one form
to another.
The principle of conservation of mechanical energy:
In the absence of air resistance or any external forces, the mechanical energy of an object is
constant.
(Ep + Ek)i = (Ep + Ek)f
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