Year 10 Term 2 - Class Notes

Displacement and distance

• Displacement of an object is the distance travelled in a particular direction whereas distance refers to the total length of the path travelled. Displacement is a vector quantity whereas distance is a scalar quantity.
• SI (Standard International) unit = metre (m)
• e.g. if object travels 5 cm East and 5 cm South

  	Total distance travelled = 10 cm Displacement = approx 7 cm South East (use Phythagoras to solve)

Velocity and Speed - read text p 243

• Average speed = distance travelled / Time taken
• V elocity is the speed in a particular direction.
• Units used m/s or km/h, however the SI unit = m/s (This must be used when velocity is used in most formulae)
• Conversion of units km/h to m/s (divide by 3.6); converting m/s to km/h (multiply by 3.6).

  where v = velocity, s = displacement t = time

Do Questions and exercises in Motion Booklet pages 10-12, Text book p 245.