Pendulum
Conservation of energy on a swinging pendulum
Name the energy changes in a windmill.
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Insta-freeze
Dissolved gases in a liquid lower the freezing point temperature. When the gases leave, the liquid is able to freeze.
Ex 3) Pendulum
Where is PE max? KE max? PE = 0? KE = 0? KE = PE?
[ Flash ] — Show Me The Physics
If PE at A = 10 J, KE = 0
| PE | KE | |
|---|---|---|
| A | 10 J | 0 J |
| B | 0 J | 10 J |
| D | 10 J | 0 J |
If PE at C = 3 J, KE = ?
If the Wf as the pendulum moves from A to B is 1.5 J, what are the KE and PE of the pendulum at the bottom of the swing?
Wind turbines convert one form of energy into another. What is that conversion?
All Pendulums
Ex 4
A 1.0 kg pendulum swings to a height of 0.20 m above its lowest point.
What is the KE of the pendulum at the lowest point?
A pendulum is pulled to the side and released. Which plot of d vs PE is correct?
Answer
Review
Ex 5
A 5.00-kg cart is at the foot of a hill 10.0 m high. For the cart to reach the top of the hill, what is the minimum KE of the cart in the position shown?
[neglect friction]
m = 5.00 kg
h = 10.0 m
KE = ?
Finding the height of a pendulum from a pendulum angle
Enrichment
Pendulum Top View
Foucault's Pendulum — Proved the Earth rotates
School blocks YouTube? Foucault_PendulumReal.wmv
Pendulum mounted on a rotating base
School blocks YouTube? Foucault_Pendulum.mpg | Foucault_Pendulum.wmv
