Energy

What is energy?

Energy is the ability to do work. To do work you have to move an object in the direction the force is being to applied. When you apply force to one thing that energy transfers over to the object and then when that object does work to another object that energy is transferred again. So work is the transfer of energy.

The Law of conservation of Energy

This is law states that energy cannot be created or destroyed but can be changed from one form to another. What this means is that no matter how many times one energy changes to another, the energy's total amount will always be the same. If they object has more than one energy type the object's total amount of energy will still be the same. When there are conversions in the object some of its energy will turn into thermal energy because of the friction it needs to overcome to make a successful conversion.

Why are energy conversions important?

Anything and everything that we as humans do involve energy conversions. From cooking the food we eat to vacuuming the floors all things need to energy conversions to work. Most things involve electrical energy. Electrical energy can easily be converted.

Energy in plants

Plants use photosynthesis to make their food. Photosynthesis uses light energy, water and carbon dioxide to make oxygen and glucose (the plants food). So if you eat meat from an animal that once at plants you are really eating the energy that the plant produced. If you use plants for other things such as burning wood the plants energy can be converted into another form.

How does energy apply to machines!

Sometimes you transfer energy to a machine to make it do work. When you transfer energy to the machine that machine will apply that energy on the object that machine is doing work on. This is easier than doing the work yourself. However, some machines measure energy. Which allows you to measure the amount of energy.

Sources

Science Text Book