Law of Conservation? PLEASE HELP!?

Question

Okay, here is my question:

"The Law of Conservation of Energy states that energy cannot be created or destroyed, but can change its form."

Here is says that it cant be destroyed or created, but can be changed, so how can i draw something that would explain this ? i need it by tomorrow and its for school :D PLEASE HELP! i need to understand and what i can draw to explain the law of conservation of energy. THANKS!! 2 points for answers thx. :D

Answer 1

If we see mass as a form of energy then we have no net creation when mass is converted to  energy in a nuclear reaction. E=MCC

But energy can be consumed in creating a chemical form of energy, as in photosynthesis, or a chemical form of energy can be converted to heat or mechanical energy.

When we see a system in which there appears to be energy created, the law says we need  to look for some outside source of energy. A tank of liquid ammonia causing a small motor to run as gas escapes... we have to know that the energy is being supplied by the environment heating the very cold tank of ammonia.

When a pair of skaters catch each others' hands while traveling in opposite directions, and bring themselves close to each other, they suddenly go faster, without moving their skates. We know the extra energy came from the force they applied to bring themselves together.

In effect, the law is a guide that tells us that we can add up energy inputs and outputs precisely.

Because nuclear fission and fusion appear at first blush to violate this rule, we have to look for a conversion of mass to energy.

Answer 2

you have got many good answer, if you want further simpler form,

think of solar energy, which get converted in to carbohadrates and protiens by photosynthesis.  These carbohadrates and protiens are consumed by man and animals and get stored in their body which is used by them and release in form of heat.

Answer 3

OK here goes...

Think of water in a d**n. The pressure of the water is released and spins a turbine that turbine then is  magnets spun around a ball of copper, thus creating a current. The water in the reservoir  is "potential energy" it is changed into "kinetic energy" when released it is then changed into "electrical energy" as the current.

Does this help?

Answer 4

As you said, energy can neither be created nor destroyed, thus it is conserved. The second law of thermodynamics is the law of increasing entropy, which in simple terms means that energy will move from a state of greater order towards a state of lesser order. During this process the energy is not lost, but is converted into other forms.

Here is an example: The electricity (electrical energy) that flows into your home is highly ordered, but not visible. When it flows through a light bulb (for simplicity let's say a conventional incandescent bulb) it meets resistance in the tungsten filament which causes the filament to glow - thus much of the electrical energy has now been converted into visible light energy. However, not all of the electrical energy is converted into light energy - the resistance of the filament is high, so some is also converted into heat energy - which is why a light bulb is hot to the touch.

This is what is meant by the conservation of energy - that the total amount remains the same, but its type or state changes.