Concept Card: Newton’s Third Law of Motion & Action-Reaction Pairs 1. Formal Statement of Newton’s Third Law: To every action, there is always an equal and opposite reaction; or the mutual interactions of two bodies upon each other are always equal in magnitude and directed along opposite directions. Vector representation: $$\vec{F}_{AB} = -\vec{F}_{BA}$$ where $\vec{F}_{AB}$ … Read more
Concept Card: Linear Momentum & Newton’s Second Law of Motion 1. Linear Momentum ($\vec{p}$): The linear momentum $\vec{p}$ of a body of mass $m$ moving with velocity $\vec{v}$ is defined as: $\vec{p} = m\vec{v}$ – Vector quantity; directed along the velocity vector $\vec{v}$. – SI unit: $\text{kg}\cdot\text{m/s}$ or $\text{N}\cdot\text{s}$. Dimensions: $[M L T^{-1}]$. Relation with … Read more
Concept Card: Force, Inertia & Newton’s First Law of Motion 1. Physical Definition and Nature of Force: A force is an external vector interaction (push or pull) that changes or tends to change an object’s state of rest or of uniform rectilinear motion, or causes deformation. Forces in nature are classified fundamentally into four categories: … Read more