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P3 REVISION NOTES!
MOMENTS!
The moment of a force F about a pivot is F x d, where d is the perpendicular distance from
the pivot to the line of action of the force.

CENTRE OF MASS!
The centre of mass of an object is the point where its mass…

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The `normal' at a point on a mirror is perpendicular to the mirror.
For a light ray reflected by a mirror: the angle of incidence=the angle of reflection
The angle of incidence and the angle of reflection are always measured between the ray and
the normal.

CURVED MIRRORS
The principal…

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Is at right angles to both the direction of the magnetic field and to the wire,
Is reversed if the direction of either the current or the magnetic field is reversed.

ELECTROMAGNETIC INDUCTION
When a wire cuts the magnetic field lines, a potential difference (p.d.) is induced in the wire.…

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