Newton’s laws of motion and Work-Energy theorem
According to Newton's laws of motion, a body behaves in 3d space with respect to 3 basic laws. These are generally called the "Laws of motion". It is a very important concept in mechanics, specifically classical mechanics.
The three laws of motion as proposed by newton are:
Law 1 – "A body continues to be in its state of rest or motion, unless or until it is compelled by an external force".
What it actually means is that a body that is in rest or in motion will never change its state of motion (rest or in motion), until or unless an external force is applied.
This force (external) should be not from the system itself. It should be strictly from outside the system.
Law 2 – "The Acceleration on a body depends upon 2 factors: The net force acting on the body and the mass of the body"
This means that the net force, mass and acceleration are dependent on each other for a body in motion by the given equation
(Where m=mass of body, a= acceleration and F=net force)
Law 3 – "Every action has an equal and opposite reaction"
One of the most famous quotes that unknowingly dictates a very important law in physics.