6.1 Conservation of Energy
Energy is never created or destroyed, but can change from one form to another.
In other words, the total amount of energy never changes in an isolated system.
Mechanical Energy,
Mechanical energy is the sum of the kinetic energy and all forms of potential
energy. We will consider situations where the potential energy is in the form of
gravitational potential.
Suppose a 1.0 kg rock is dropped from a height of 10 m. Calculate the rock’s
mechanical energy at the top, half way down, and just before hitting the ground.
Use
.
i)
+
ii)
Find
half way down.
iii)
Need to find at the bottom.
The total amount of Mechanical Energy remains constant.
HW Worksheet
P180 # 1 to 3
P183 # 1, 2, 5, 10 to 14