Revise: Newton's LawsNewton's First Law

Isaac Newton’s Laws of Motion describe how forces change the motion of an object, how the force of gravity gives weight to all masses, how forces cause acceleration and how forces work in collisions.

Part ofPhysicsRevision guides: Dynamics

Newton's First Law

Isaac Newton made statements in his Laws of Motion about the effect of balanced and unbalanced forces.

Newton's First Law is concerned with balanced forces. It states that if a body is at rest and the forces acting on it are balanced then the body will remain at rest.

However if the body is moving and the forces acting are balanced then the body will keep moving at constant speed in a straight line.

Newton's First Law