A particle has a mass, but a size that can be neglected.
A concentrated force represents the effect of a loading, assumed to act at a point of a body.
A rigid body can be considered a large combination of a large number of particles in which all particles remain at a fixed distance from each other.
Newton's 3 Laws of Motion:
- First Law: A particle at rest (originally), or moving in a straight line with constant velocity, tends to remain in this equilibrium state provided the particle is not subjected to an unbalanced force.
- Second Law: A particle acted upon an unbalanced force 'F', experiences an acceleration 'a', that has the same direction as the force. *F = ma
- Third Law: Mutual forces of action and reaction between two particles are equation, opposite, and collinear. (For action, there is an equal and opposite reaction.)
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