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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.

 

 

 

showmethephysics.com

Show Me The Physics
YouTube Channel

 

 

Fill in the Blank Notes

 

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 = ?

 

 

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 = 1.96 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(9.8 m/s2)10.0 m

 

 

KE = 490. 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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