The Sun is the main source of energy, and it is very important in our life, but there are resources of energy which are renewable sources of energy and non-renewable sources of energy, They...
Importance of the Sun Do you see the Sun in the sky in the morning every day? Do you know the importance of the Sun? The Sun is the main source of energy on...
People use levers but they do not know the type of them and how to determine the type of any lever, The levers are classified according to the location of the effort force, the...
The levers are the most common simple machines that help man to perform heavy tasks easily. They were first described in 260 B.C, The liver is affected by an effort force and a resistance...
