Newton's second law

Newton's Second Law or the Law of Dynamics states that the force acting on an object is equal to the mass of the object multiplied by the acceleration it undergoes:



m— mass of the object
a— acceleration.

In the International System of Units (SI), the unit of force is the newton (N). One newton is the force that gives a mass of 1 kg an acceleration of 1 m/s2.

Newton's Second Law can also be expressed as:

$$\vec{F}=\frac {d\vec{p}}{dt}$$


dp— change in momentum
dt— time interval for the change in momentum.

In this more general form, the law remains valid in special relativity.

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