Anaya Nolan
Newton's three laws of motion are the foundation of classical mechanics, a branch of physics that describes how bodies behave under the influence of outside forces. The laws were first formulated by Sir Isaac Newton, an English physicist and mathematician, and published in his 1687 book, Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), commonly known as The Principia. The three laws describe the relationship between the motion of an object and the forces acting upon it, providing a strong foundation for understanding the dynamics and behaviour of objects in the physical world.
| Characteristics | Values |
|---|---|
| First Law of Motion | An object at rest will remain at rest, and an object in motion will continue moving with a constant velocity, unless acted upon by an external force. Also known as the Law of Inertia. |
| Second Law of Motion | The force acting on an object is equal to the product of its mass and acceleration. |
| Third Law of Motion | The law of action and reaction states that for every action, there is an equal and opposite reaction. |
| Law of Gravity | An object attracts another object in direct proportion to their combined mass and inversely related to the square of the distance between them. |
| Principle of Relativity | The laws of physics are the same for all inertial reference frames. |
| Principle of Constancy of the Speed of Light | Light always propagates through a vacuum at a definite velocity, which is independent of the state of motion of the emitting body. |
| The First Law of Thermodynamics | Demonstrates the relationship between internal energy, added heat, and work within a system. |
| The Second Law of Thermodynamics | Relates to the natural flow of heat within a closed system. |
| The Third Law of Thermodynamics | States that it is impossible to create a thermodynamic process that is perfectly efficient. |
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What You'll Learn
Newton's First Law of Motion: The law of inertia
Newton's First Law of Motion, also known as the law of inertia, is one of the three foundational principles of classical mechanics, which is a branch of physics. This law states that an object will not change its motion unless compelled by an external force to do so. Inertia is defined as an object's tendency to maintain its velocity, and this tendency to resist changes in its state of motion is a key aspect of Newton's First Law.
The law can be stated as follows: a body at rest tends to remain at rest, and a body in motion tends to stay in motion, moving in a straight line at a constant velocity. This means that an object will continue moving in a straight line and at a constant speed unless acted upon by an external force. For example, when a pilot changes the throttle setting of an engine, or when a ball falls through the atmosphere, the motion of these objects is influenced by external forces.
The concept of inertia was first formulated by Galileo Galilei, who deduced it from his experiments with balls rolling down inclined planes. Galileo's principle of inertia helped explain why, if the Earth is spinning on its axis and orbiting the Sun, we do not sense that motion. According to the principle of inertia, as we are in motion together with the Earth, our natural tendency is to retain that motion, causing the Earth to appear to us as being at rest.
Newton's First Law of Motion is significant because it forms the basis of classical mechanics and provides a foundation for understanding modern physics. By outlining the relationship between a physical object and the forces acting upon it, this law helps explain the behaviour of objects when subjected to external forces.
Newton's three laws of motion were first introduced in his 1687 book "Philosophiae Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy), commonly known as "The Principia." These laws revolutionised science by providing insights into the behaviour of objects and the forces acting upon them, as well as explaining why planetary orbits are ellipses rather than circles.
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Newton's Second Law of Motion: The relationship between force, mass and acceleration
Newton's three laws of motion, first published in 1687, form the basis of classical mechanics, explaining the relationship between a physical object and the forces acting upon it.
Newton's Second Law of Motion
Newton's Second Law of Motion defines the relationship between force, mass, and acceleration. It states that the acceleration of an object is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. In other words, force is equal to the change in momentum (mass times velocity) over time. The law can be expressed mathematically as:
> a = Fnet/m
Or
> F = ma
Where F is force, m is mass, and a is acceleration.
This means that if you double the force, you double the acceleration, and if you double the mass, you halve the acceleration. For example, a rocket burning fuel will experience increasing acceleration over time as its mass decreases, even as the propulsion force remains constant.
Newton's Second Law can be used to make predictions about the behaviour of massive bodies under the influence of external forces. It helps us understand how objects move or do not move when forces act upon them.
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Newton's Third Law of Motion: The law of action and reaction
Newton's three laws of motion form the basis of classical mechanics, which describes how bodies behave under the influence of outside forces. They were first published in 1687 in Isaac Newton's book "The Mathematical Principles of Natural Philosophy", commonly known as "The Principia".
Newton's third law of motion, also known as the law of action and reaction, states that for every action, there is an equal and opposite reaction. For example, when a rocket launches, hot exhaust gas is generated from fuel combustion in the rocket's engines. This exhaust gas is pushed out of the rocket (the action), generating thrust (the reaction).
It's important to note that the "'action' and 'reaction' forces" described in Newton's third law apply to different bodies. For instance, consider a book resting on a table. While it may be intuitive to think that the "'action' is the downward force of the book on the table, and the 'reaction' is the support force from the table holding up the book", this is not the case. Instead, the "'action' is the Earth's gravitational pull on the book, and the 'reaction' is the gravitational pull of the book on the Earth." This distinction is crucial to understanding the underlying principle of the law, which relates to the conservation of momentum.
Newton's third law must be modified in special relativity. This is because a key feature of special relativity is that simultaneity is relative, meaning that events that are simultaneous for one observer may not be simultaneous for another. As a result, in a given observer's frame of reference, the action and reaction may not be exactly opposite, and the total momentum of interacting bodies may not be conserved.
In summary, Newton's third law of motion, the law of action and reaction, states that for every action, there is an equal and opposite reaction. This law helps us understand the fundamental principle of the conservation of momentum and has applications in various fields, including the study of rocket launches and spacecraft.
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Classical mechanics
Newton's first law of motion, also known as the Law of Inertia, states that an object will remain at rest or continue moving with a constant velocity in a straight line unless compelled to change by an external force. This tendency to resist changes in the state of motion is what we call "inertia". For example, when a car suddenly stops, a wallet on the passenger seat will continue moving forward with the same velocity until an external force, such as the car floor, acts on it.
The second law defines force as the change in momentum (mass times velocity) per change in time. In other words, the rate of change is directly proportional to the amount of force applied. This law helps us understand how bodies respond to external forces.
Newton's third law of motion is the law of action and reaction. It states that for every action (force) in nature, there is an equal and opposite reaction. If object A exerts a force on object B, object B will exert an equal force in the opposite direction on object A.
Together, these three laws form the basis of classical mechanics, explaining how bodies behave under the influence of outside forces. Classical mechanics is concerned with the observable universe and the forces that act on objects within it, such as gravity, friction, and muscle effort.
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The laws of thermodynamics
The first law of thermodynamics, a version of the law of conservation of energy, states that energy cannot be created or destroyed. This is also known as the conservation of energy. In other words, energy can be transferred between the system and the surroundings through the transfer of heat or by the performance of mechanical work. In an externally isolated system, even with internal changes, the sum of all forms of energy must remain constant.
The second law of thermodynamics indicates the irreversibility of natural processes and the tendency of natural processes to lead towards spatial homogeneity of matter and energy, especially temperature. It states that in a natural thermodynamic process, the sum of the entropies of the interacting thermodynamic systems never decreases. This is often referred to as the irreversibility of natural processes. A common corollary of the statement is that heat does not spontaneously pass from a colder body to a warmer body.
The third law of thermodynamics states that a system's entropy approaches a constant value as the temperature approaches absolute zero. This means that it is impossible to create a thermodynamic process that is perfectly efficient.
The zeroth law of thermodynamics defines thermal equilibrium and forms the basis for the definition of temperature. If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. This law allows for the definition of temperature in a non-circular way without reference to entropy, its conjugate variable.
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Frequently asked questions
The first three laws of physics are also known as Newton's Three Laws of Motion. They were first published in 1687 in Sir Isaac Newton's book, 'The Mathematical Principles of Natural Philosophy', also known as 'The Principia'.
Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest will remain at rest, and an object in motion will continue moving with a constant velocity, unless acted upon by an external force.
Newton's Second Law of Motion defines force as equal to the change in momentum (mass times velocity) per change in time.
Newton's Third Law of Motion is the Law of Action and Reaction. It states that for every action, there is an equal and opposite reaction.
The Law of Inertia states that the natural behaviour of a body is to move in a straight line at a constant speed. It was first formulated by Galileo Galilei and later generalised by René Descartes.
Newton's Three Laws of Motion are important because they are the foundation of classical mechanics, one of the main branches of physics. They explain the relationship between the motion of an object and the forces acting upon it.
