Newton's laws of motion
Newton's Laws of Motion
Newton's Laws of Motion (pronunciation: /ˈnjuːtənz lɔːz ɒv məʊʃən/) are three physical laws that form the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. These laws were first compiled by Sir Isaac Newton in his work Philosophiæ Naturalis Principia Mathematica in 1687.
First Law: Law of Inertia
The First Law, also known as the Law of Inertia (pronunciation: /ɪˈnɜːrʃə/), states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same speed and in the same direction, unless acted upon by a net external force. The term "inertia" is derived from the Latin word, 'iners', meaning idle, or lazy.
Second Law: Law of Acceleration
The Second Law, or the Law of Acceleration (pronunciation: /əkˌsɛləˈreɪʃən/), states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. The direction of the acceleration is in the direction of the applied net force.
Third Law: Law of Action and Reaction
The Third Law, also known as the Law of Action and Reaction (pronunciation: /ˈækʃən ænd riˈækʃən/), states that for every action, there is an equal and opposite reaction. This means that any force exerted on a body will create a force of equal magnitude but in the opposite direction on the object that exerted the first force.
Related Terms
- Force: A push or pull upon an object resulting from the object's interaction with another object.
- Inertia: The resistance of any physical object to any change in its state of motion.
- Acceleration: The rate of change of velocity of an object with respect to time.
- Mass: A measure of the amount of matter in an object.
External links
- Medical encyclopedia article on Newton's laws of motion
- Wikipedia's article - Newton's laws of motion
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