How does cant made nor destroy law of energy work here

In summary, when a ball of one kilogram is placed one meter above the surface of Earth with no movement, its energy is 9.81J. However, when it is placed 9 meters higher, its energy becomes 98.1J even though there is still no movement. This is because energy cannot be created or destroyed, so the work you did in moving the object higher resulted in a gain in potential energy. Therefore, the 89J of energy came from the work done on the object.
  • #1
nibbel11
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2
imagen a ball of a kilogram is one meter above the surface of earth, no movement. its energy is
E=mgh=1x9,81x1=9,81J
but if you place it 9 meters higher it has a total of 1x9,81x10=98,1J and there is still no movement
if energy can't be made or destroyed, where did the 89 J come from?
 
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  • #2
nibbel11 said:
imagen a ball of a kilogram is one meter above the surface of earth, no movement. its energy is
E=mgh=1x9,81x1=9,81J
but if you place it 9 meters higher it has a total of 1x9,81x10=98,1J and there is still no movement
if energy can't be made or destroyed, where did the 89 J come from?

From "you". You moved it higher, and thus, you did work onto the object against the gravitational field. This work that you did is equal to the potential energy gain of the object.

Zz.
 
  • #3
i tried it out myself and yes
W=m*g*d= 1*9,81*9=88,29J
this plus the potetial energy i already had and you get
88,29+9,81=98,1J
thank you
 
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1. What is the law of conservation of energy?

The law of conservation of energy states that energy cannot be created or destroyed, but can only be transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time.

2. How does this law apply to everyday life?

This law applies to everyday life in many ways. For example, when we turn on a light bulb, the electrical energy is transformed into light energy. When we ride a bike, the chemical energy stored in our bodies is transformed into kinetic energy. It also explains why perpetual motion machines, which claim to create energy out of nothing, cannot exist.

3. Can energy really not be destroyed?

Yes, according to the law of conservation of energy, energy cannot be destroyed. It can only be converted into other forms, such as heat, light, or motion. However, energy can be lost in the form of heat or other forms of energy that are not useful to us.

4. Is this law always applicable?

Yes, the law of conservation of energy is a fundamental principle of physics and is always applicable. It holds true in all physical processes, from the smallest particles to the largest galaxies. However, it is important to note that this law only applies to closed systems where no energy is added or taken away from the system.

5. How was this law discovered?

The law of conservation of energy was first proposed by the German physicist Julius Robert von Mayer in 1842. It was later formalized by the English physicist James Prescott Joule and the German physicist Hermann von Helmholtz in the 1850s. Through experiments and observations, they were able to show that energy is always conserved in physical processes.

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