Download Mechanical Energy: Sum of all the Kinetic and Potential Energy

Reference Table Review
Mechanical Energy: Sum of all the Kinetic and Potential Energy 4 types of energy in physics: KE, PEg , PE s, Q
kinetic energy
gravitational
potential
energy
elastic
potential
energy
Internal
Energy
(heat)
only 3 of them figure into mechanical energy:
not part of mechanical energy
Conservation of Energy
cliff
after
1. ID the system of objects and types of energy involved
2. set total sum of E's in one place = total sum of E's in another
3. expand and solve for unknown
mass cancels, this can be solved for either the velocity or the height, depending on the problem
5.0 m
cliff
A rock is thrown downward with an unknown
initial speed from a height of 5.0 m. Just prior to striking
the ground, the rock's speed
is 15 m/s. Ignoring air resistance,
use conservation of energy to determine the rock's initial speed.