10 - Pressure, Gravity and Moments

The mass per unit volume of a substance.

Force per unit area.

states that when an object is partially
or completely immersed in a fluid, it experiences an upthrust which is equal to the weight of fluid displaced.

states that the weight of a floating
body is equal to the weight of the fluid it displaces.

states that at constant temperature the volume of a fixed mass of gas is inversely proportional to its pressure.

states that the force between two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.

Force × Perpendicular Distance

**Check Papers**

• The vector sum of the forces in any direction is zero.
• The sum of the moments about any point is zero.

The Centre of Gravity of an object is the point through which all the weight appears to act.

A rigid body which is free to rotate about a fixed point called a fulcrum

Two parallel forces with the same magnitude acting in opposite
directions