Force and Density

Lesson Order

• 4-FAD-01 Scalars and vectors
• 4-FAD-02 Moments and Centre of Gravity
• 4-FAD-03 Principle of moments
• 4-FAD-04 Hooke's Law
• 4-FAD-05 Pressure
• 4-FAD-06 Density
• 4-FAD-07 Revision and test

Topics covered

• The difference between scalars and vectors
• Adding forces along a line
• Recall and use of Moment = force x perpendicular distance from pivot
• The weight of a body acts through the centre of gravity
• The principle of moments
• The upward force on a light beam varies with the position on a heavy object placed on the beam
• How extension varies with applied force for helical springs, metal wires and rubber bands
• Hooke's Law
• Elastic behaviour and plastic deformation
• Pressure = force / area
• Density = mass / volume
• Direct measurement of the density of solid, liquid and gas