How to Derive newtons first law from second law?

Answer 1

The derivation is as follows:

Consider an isolated system of two bodies A and B. An isolated system is such that no force acts on the system.

This is the Newton's third law of motion for a body exerting some force on another.

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Answer 2

Newton's first law:

I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

(Things in motion stay at rest and things in motion stay in motion unless an external force is applied.)

Newton's second law:

II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma.

The second law says that, in order to have an acceleration, there must be an external force. In order for an object at rest to start moving, or for an object in motion to slow down/speed up, it has to accelerate. This implies that without an external force, there is no acceleration. Therefore, without an external force, objects at rest will stay at rest, and objects in motion will stay in motion with constant velocity.

Answer 3

Newton's Second Lawe is Force F=ma. The Second Law becomes the First law if Force is zero, 0=ma. The First Law is there is no change in motion or velocity if there is no force. No force , no acceleration, no acceleration no change in motion.

Answer 4

Newton's first law can be derived from the second law by considering a situation where the net force acting on an object is zero. From Newton's second law (F = ma), if the net force is zero (F = 0), then the acceleration (a) of the object must also be zero. Therefore, the object remains at rest or continues to move at a constant velocity, thus obeying Newton's first law.

Answer 5

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