Page 15 - eEISBN FINALIZE
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laws have been expressed in several different ways, over nearly three centuries,[1] and can be
summarised as follows:
1.4.1 FIRST LAW
In an inertial reference frame, an object either remains at rest or continues to move at a constant
velocity, unless acted upon by a force.
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1.4.2 SECOND LAW
The acceleration of a particle acted upon by an unbalanced forces is in the same direction of the
forces and has a magnitude that is directly proportional to this forces.
1.4.3 THIRD LAW
When one body exerts a force on a second body, the second body simultaneously exerts a force
equal in magnitude and opposite in direction on the first body.
The forces of action and reaction between two particles or two rigid bodies are equal in magnitude,
collinear and opposite in direction.
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