Newton's First Law of Motion

Newton's Laws of Motion

• Provide the foundation for all the root of physics
• There are 3 fundamental laws of motion

Newton's  first law:

• Also called the law of Inertia
• "A body at rest will stay at rest. If in motion will remain in motion unless acted upon by an unbalanced external force."
• In space where there is no friction, a body will continue to move indefinitely if it is already in motion.

 Inertia

• The resistance that a body demonstrates to a change in its state of motion.
• All object have inertia. 
• The amount of inertia possessed by a body is determined by its mass.  (Remember that mass is the amount of matter contained within an object)

Example: If a 150 lbs person run into a 150 lbs person, he could able to stop. If a 300 lbs person run into a 150 lbs person, he could not be able to stop.

• The more mass an object has, the greater its inertia. In other word, the harder it is to move it or slow it down.

Balanced vs Unbalanced forces: If a forces acts on a body, and there is no force to counter it, the force is said to be unbalanced.

• First box - Unbalanced force of 50 Newtons applied to the box
• Second box - The force are balanced. That is, they canceled out.