Question

1. define energy.
2. our greatest source of physical energy is the
3. as far as measurement is concerned, work and energy are
4. stored energy is called energy.
5. the energy that is doing work is called energy.

Explanation:

Question 1

Energy is the capacity to do work. It can exist in various forms such as kinetic, potential, thermal, electrical, etc., and is required to perform any physical or chemical process.

The Sun is the greatest source of physical energy for Earth. It provides solar energy which is converted into various forms like heat, light, and is the primary source for processes like photosynthesis, weather systems, and also for human - made energy production through solar panels.

In the context of measurement in physics, work and energy have the same unit. The SI unit for both work and energy is the joule (J). This is because work is defined as the transfer of energy, so when work is done, energy is transferred, and they are measured in the same unit.

Answer:

Energy is the capacity to do work (or the ability to cause change, or the property that must be transferred to an object to perform work on it, etc. - standard definitions of energy in physics context).

Question 2