On 10 Apr 2021 09:40:11 GMT, Luigi Fortunati wrote:
Let me try a simpler, and clearer, answer.
> In the formula F=ma force is related to acceleration.
I always write this formula as a=F/m in order to stress the fact that if a
force F acts on a body/particle of mass m, then the particle will get an
acceleration a given by a=F/m. This is the Newton's second law.
F is the CAUSE (of the acceleration) and a is the EFFECT. I put the effect
on the left hand side, and the cause on the right hand side,
I DO NOT take the formula F=ma to be DEFINITIONS for F !!!
In a=F/M, F is ANY force, of any nature, coming from various sources, for
example:
- a spring acting on the body or particle: k*x (x is the displacement from
the equilibrium position
- a rope - F = tension in the rope
- a surface with which the body is in contact
- an static electric force (Coulomb) Q1*Q2/d^2
- or gravitational force: m1*m2/d^2
- or friction, etc.
Correspondingly, if on the body/particle acts, for example, only a spring,
then the Newton's second law gives that the acceleration will be
a=F/m=k*x/m
Please note that the Newton's second law is only valid with respect to
certain frames of reference. But about this - maybe later.
IF you believe this was useful for you, please let me know and I will
answer your questions and then I will continue.