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Name the energy changes in this video?
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D) Law of Conservation of Energy - unless work is done on or by a system, its total mechanical energy does not change.
Was energy created in this video?
Girl goes flying After the biggest piggy back blob jump
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The massive PE of the men on the platform completely turned into KE at the bottom of their jump.
The boy on the blob has more KE but less PE than the man.
1. Total Mechanical Energy
= PE + KE
Ex 1) Falling object (no friction)
Answer
As the Object Falls,
PE Lost = ....
...KE gained
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Predict how far up the incline each ball will go. (assume no friction)
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Why does each ball rise to the same height from which it began? |
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PE depends only on height. Ball stops when all KE turns into PE |
Energy changes
in a roller coaster
- Teachers Domain
Ex 2)
IF KE at A = 0
PE = ?
PE = mgh,
g = 10 m/s2
PE = 3 kg(10 m/s2)3 m
= 90 J
| PE | KE | |
| A | 90 J | 0 |
B?
m = 3 kg, h = 1 m
| B | PE | KE |
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30 J |
60 J |
C?
m = 3 kg, h = 0
| C | PE | KE |
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0 J (h = 0) |
90 J |
D?
m = 3 kg, h = 1 m
| D | PE | KE |
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30 J |
60 J |
m = 3 kg, h = 0
| E | PE | KE |
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0 J (h = 0) |
90 J |
m = 3 kg, h = 1 m
| F | PE | KE |
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30 J |
60 J |
m = 3 kg, h = 3 m
| G | PE | KE |
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90 J |
0 J |
H?
| H | Never gets there! Doesn't have the energy to go any higher than G |
Physics of Designing Rollercoasters
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At what minimum height should you place the ball so it makes it all the way around the loop? |
UC Irvine
School blocks YouTube? Use the files below.
| LoopTheLoop.mov |LoopTheLoop.mpg |
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The ball has to be placed at a height above the top of the loop so it has the KE to continue. |
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