Moments & Pressure

• moment

  the turning effect of a force
• moment = force x distance
• moment is balanced when clockwise and anticlockwise moments are the same
• moments is a turning effect to keep clockwise and anticlockwise moments balanced
• density = mass / volume
• force = mass x gravitational field strength
• pressure = force / area
• pressure in a liquid = height x gravitational field strength x density
• if an object floats it weight and upthrust are equal
• atmospheric pressure

  is the weight of the atmosphere acting on an object at sea level
• atmospheric pressure decreases with height