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physics:newtons_laws_of_motion [2020/11/23 14:56] – epix | physics:newtons_laws_of_motion [2021/01/25 05:19] (current) – some detail epix | ||
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- | FIXME need other two laws aswell! | ||
====== Newton' | ====== Newton' | ||
- | ====== 1st Law ====== | + | ===== 1st Law ===== |
- | Mathmatically | + | < |
+ | Newton' | ||
===== 2nd Law ===== | ===== 2nd Law ===== | ||
- | Same as the first law: $F_{net} = ma$, but where $F_{net} \ne 0$ | + | < |
+ | In an inertial frame of reference, the vector sum of the forces $F_{net}$ on an object is equal to the mass $m$ of that object multiplied by the acceleration a of the object. Mathmatically the same as the first law: $F_{net} = ma$((It is assumed here that the mass $m$ is constant)), but where $F_{net} \ne 0$. | ||
+ | |||
+ | ===== 3rd Law ===== | ||
+ | < | ||
+ | The third law states that whenever one body exerts a force on a second body, the second object exerts a force that is equal in magnitude and opposite in direction. $F_a = -F_b$. Note that it is the **force** that is equivalent. With the 2nd law, this means that they can have differing accelerations after the application of the force depending on mass. |