Definition- Law of Conservation of Energy
- is when there is total energy that stays constant in a isolated system and is conserved over time.
Mathematical Representation for the Law of Conservation of Energy
- Conservation, Energy, Law and Legal and even LCE
- This is the law of energy can neither be created nor destroyed rather than it only transforming from one to another.
- Abbreviated version: Ef = Ef
- Extented version: Ki+ PEi= Kf + PEf
Different Units of Energy
- SI units- Joules (J)
- American units -
Video
Paragraph of Explanation
My video shows a bottle being let go from the highest point to the lowest point at the bottom. The water bottle have the most potential energy at the top and when it goes down to the bottom gravity is helping it go faster down. As for the kinetic energy, it had the most at the bottom so when the bottle bounced off the table it once again had a bit of potential energy.
Paragraph of Explanation
My video shows a bottle being let go from the highest point to the lowest point at the bottom. The water bottle have the most potential energy at the top and when it goes down to the bottom gravity is helping it go faster down. As for the kinetic energy, it had the most at the bottom so when the bottle bounced off the table it once again had a bit of potential energy.
Two Example problems
1) During a hurricane, a large tree limb, with a mass of 20.0 kg and a height of 13.3 m above the ground, falls on a roofs that is 6.0 m above the ground.
Work:
Known: m= 20.0 kg, h limb = 13.3 m, h roof= 6.0 m, g= 9.80
h= h limb - h roof
= 13.3 m - 6.0 m
= 7.3 m
(20.0 kg)(9.80 m/s2)(7.3)
= 1.6 X10^3 J
KEf = 1/2 mvf ^2
Vf= √2KEf / m
= √2(1.6X10^3 J) / 22.0 kg
= 12 m/s
2) A girl, 40 kg, is standing on a 20 meter house. She decides to jump off the house into the pool in your backyard below. How fast was she moving when she hits the water?
Unknown- Vf=?
Known- mvi^2/ 2 + mghi = mvf^2 + mghf
mghi = mvf^2/2
2ghi = vf
√2ghi = vf
Vi= 0 m/s
m= 40 kg
hi = 20 m
hf = 0 m
g = 9.8
(40)(9.8)(20) = 7840
√2(9.8)(20)
vf= 19.8
3 Screenshots
a) The first photo shows how the skater goes on the track, the fastest at the end of the track because the strong force of the skater going from the top of the track plus the loop itself made the skater go faster. The skater was experiencing potential energy at the top, then kinetic energy.
b) The second photo completing shows a good example of the skater being on the loop on top before reaching the ground of the loop again. This shows that once the skater went down on the track the kinetic energy went up and then went down when he went up on the loop which increased the potential energy again and added a bit of thermal energy to it.
c)The third photo shows a great deal of potential energy at the top before it goes down on the loop. This is because the energy is being stored at the top so when the skater goes down on the loop,he will go faster.
KEf = 1/2 mvf ^2
Vf= √2KEf / m
= √2(1.6X10^3 J) / 22.0 kg
= 12 m/s
2) A girl, 40 kg, is standing on a 20 meter house. She decides to jump off the house into the pool in your backyard below. How fast was she moving when she hits the water?
Unknown- Vf=?
Known- mvi^2/ 2 + mghi = mvf^2 + mghf
mghi = mvf^2/2
2ghi = vf
√2ghi = vf
Vi= 0 m/s
m= 40 kg
hi = 20 m
hf = 0 m
g = 9.8
(40)(9.8)(20) = 7840
√2(9.8)(20)
vf= 19.8
3 Screenshots
a) The first photo shows how the skater goes on the track, the fastest at the end of the track because the strong force of the skater going from the top of the track plus the loop itself made the skater go faster. The skater was experiencing potential energy at the top, then kinetic energy.
b) The second photo completing shows a good example of the skater being on the loop on top before reaching the ground of the loop again. This shows that once the skater went down on the track the kinetic energy went up and then went down when he went up on the loop which increased the potential energy again and added a bit of thermal energy to it.
c)The third photo shows a great deal of potential energy at the top before it goes down on the loop. This is because the energy is being stored at the top so when the skater goes down on the loop,he will go faster.