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Edexcel IAL·Physics·IAL Physics

Forces & Newton's Laws

14 min read

Free-body diagrams, Newton's three laws, weight, friction and resolving forces on inclines.

A force is a push or pull (a vector, in newtons). The motion of any object is governed by the resultant of the forces acting on it.

Newton's laws

  1. An object stays at rest or moves at constant velocity unless acted on by a resultant force.
  2. F=maF = maF=ma — resultant force = mass × acceleration.
  3. Every action has an equal and opposite reaction (on a different body).

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