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Insta - freeze

Kent Chemistry Demos

 

 

 

Dissolved gases in a liquid lower the freezing point temperature. When the gases leave, the liquids is able to freeze.

 

 

Ex 3)  Pendulum

Where is PE max?, KE Max?, PE = 0?,
KE =0? KE = PE?

| Flash |
 St. Mary's 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 = ?

 

 

KE = 7 J

 

 

 

Ex) 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?

 

 

 

 

 

PE = 0 J

 

KE = 8.5 J

 

 

 

 

Wind turbines convert

one form of energy into

another. What is that

conversion?

Teachers - Check out this great clipart archive - Wpclipart

 

 

 

 

Kinetic energy to

electric energy.

 

 

 

All Pendulums

 

 


PE Max. at

 

 

Extremes

 

 

KE Max. at

 

 

Bottom

 

 

PE at Extremes

 =

 

 

KE at Bottom

 

 

 

 

KE @ Extreme

=

 

Zero

 

PE @ Bottom
always

=

 

Zero

 


 

 

 

Ex 4) 1.0 kg pendulum swings to a height of .20 m above its lowest point. 

K.E. of pendulum at lowest point?

 


 

Ex 4) 1.0 kg pendulum swings to height of .20 m above lowest point.  KE of pendulum at lowest point?

 

 

 

PE @ A

=

KE @ B

 

 

PE = mgh

= (1.0 kg)(9.8 m/s2)(.20 m)

 

 

PE = 2.0 J

 

 

PE = KE @ B = 2.0 J

 

 

Ex) A pendulum is pulled to the side and released. Which plot of d vs PE is correct?

 

 

 

 

 

 

Answer

 

 

Ex 5) 5.00-kg cart at foot of a hill 10.0 m high. For cart to reach the top of the hill, what is minimum KE of cart in the position shown?

[neglect friction.]


 

 

 

Ex 5) 5.00-kg cart at foot of hill 10.0 m high. For cart to reach the top of the hill, what is minimum K.E. of the cart in the position shown? [neglect friction.]
 

m = 5.00 kg

h = 10.0 m

KE = ?

 

KE at bottom = PE at 10.0 m

 

KE = PE = mgh

 = 5.00 kg(10.0 m/s2)10.0 m

 

 

KE = 500. J

 


Author H. Christiaen, K.U.Leuven, Belgium

 

 

 

 

Finding the height of a pendulum
from a pendulum angle

 

 

 

Energy Problems

 

Enrichment

 

Pendulum Top View

 

[ Flash ]

Foucault's Pendulum - Proved the earth rotates

 School blocks YouTube? Use the file below.

Foucault_PendulumReal.wmv

Pendulum mounted on a rotating base

School blocks YouTube? Use the files below.

| Foucault_Pendulum.mpg | Foucault_Pendulum.wmv |

 

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