1. Chapter 9.3
Mechanical Energy

2. 9.3 Mechanical Energy
The two forms of mechanical energy are kinetic energy and potential energy.

3. 9.3 Mechanical Energy
Mechanical energy is the energy due to the position of something or the movement of something.

4. Mechanical Energy
Total mechanical energy = kinetic energy + potential energy
TME = KE + PE
100 J = 0 J J
At rest, no KE, no motion
100 J = 50 J + 50 J
In motion, 50 J of PE transferred, object now has 50 J of KE.
100 J = 100 J + 0 J
In motion, no potential energy (100 J transferred to KE)
In each case, the total mechanical energy is the same. As the PE decreases, the KE increases.

5. Mechanical Energy = PE + KE
100 J = 100 J PE J KE
100 J = 50 J PE J KE
100 J = 0 J PE J KE

6. Indicate where:
KE is at a minimum and maximum
PE is at a minimum and maximum
The speed is greatest
The speed is least

7. KE min
KE min
PE max
PE max
V = 0 m/s
V = 0 m/s
transformation of PE to KE
(release)
transformation of KE to PE
(storage)
KE max
PE min
V = maximum

8. 9.3 Mechanical Energy
What are the two forms of mechanical energy?