Newtons Laws of Motion
Force:
Definition: A push or a pull
Example: Pushing a shopping cart, or pulling up a zipper
Direction and how strong the push/ pull are important factors
Newton's laws of motion consist of three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motiondue to those forces. They have been expressed in several different ways over nearly three centuries and can be summarized as follows:
- First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force. This means that in the absence of a non-zero net force, the center of mass of a pody either remains at rest, or moves at a constant speed in a straight line.
- Second law: A body of mass m subject to a force F undergoes an acceleration a that has the same direction as the force and a magnitude that is directly proportional to the force and inversely proportional to the mass, i.e., F = ma. Alternatively, the total force applied on a body is equal to the time derivative of linear momentum of the body.
- Third law: The forces of action and reaction between two bodies are equal, opposite and collinear. This means that whenever a first body exerts a force F on a second body, the second body exerts a force −F on the first body. F and −F are equal in magnitude and opposite in direction. This law is sometimes referred to as the action-reaction law, with F called the "action" and −F the "reaction". The action and the reaction are simultaneous.
Solar energy gathered by a device that collects this energy and mechanically distributes it to where it is needed.
People have used wind energy for thousands of years.
The earliest known use of wind power is by the Egyptians some 5000 years ago, who used it to sail their boats from shore to shore on the Nile. Around 2000BC the first windmill was built in Babylon.
And is wasn’t The Netherlands but Afghanistan that was using large windmills, as high as 30 feet, with 16-foot long blades by the 10th century BC.
Solar power is probably the most viable form of renewable energy and it can be used in several forms to help power your house. Many gardens now use solar lights or solar garden water features. The wide use of solar power in gardens shows exactly how it is as a source of energy. The technology and the systems are becoming smaller, more compact and better looking than when they were first created and used. Early examples of solar power systems can be seen in California where, in the 1980s, enough solar power panels were installed to power over 10 million homes. Now there is enough to power new york and las angeles.