General Scientific Laws
Galileo separated sustained motion from force, preparing the first law's account of unchanged rest or velocity and the meaning of inertia.
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Force, Motion and Newton's First Law
Galileo separated sustained motion from force, preparing the first law's account of unchanged rest or velocity and the meaning of inertia.
Open article →Types of Inertia and Reference Frames
Inertia applies to rest, uniform speed and direction, while Newton's laws require attention to inertial and accelerated frames of reference.
Open article →Second Law: Force, Momentum and Acceleration
Newton's second law makes force the rate of momentum change, connects force with acceleration and defines the SI unit newton.
Open article →Third Law: Action-Reaction Force Pairs
Newton's third law describes equal and opposite forces acting simultaneously on different bodies, not a delayed cause-and-effect sequence.
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