In the 17th Century some guy was sitting under a tree reading a book when an apple fell on his head and a revelation came to him. His name was Isaac Newton.
Newton established the fundamental principles of dynamics, the study of forces and motion. They're known as Newton's three laws of motion.
This law states that an object at rest will tend to remain at rest while an object in motion will tend to remain in motion unless acted on by an unbalanced force. The unbalanced force on the object will change the speed of object , the direction of the object, or both. The resistance from the object to change its state of motion is known as inertia. An object's inertia is dependent on its mass.
If the unbalanced force is perpendicular to the motion that the object will move in a circular path.
The unit used for force is newton.
This law states that when an object exerts a force on a second object the second exerts an equal force on the first object, but in the opposite direction. (See Figure 3)
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