Gravity

Newtons Universal law of gravitation

states that any $two point masses$ in the universe attract each other with a force that is to the directly proportional to the $product of their masses$ and inversely proportional to the $square of the distance between them.$

Newtons law of gravitation formula

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Acceleration due to gravity formula and derivation

W=mg

W=__GMm__

r2

therefore mg=__*GMm*__

r2

cancel little m ==g=__GM__==

==r2==

Moment of a force

about an axis is equal to the magnitude of the force multiplied by the perpendicular distance(from force to fulcrum) from the axis to the line of action of the force

Moment Formula (scalar quantity)

M=Fxd

Equilibrium

a body at complete rest whose resultant force is equal to zero

Conditions of equilibrium

the vector sum of the forces in any direction is zero

the sum of the moments at any point is zero