Worked examples: WACE Physics Formulae and Data Booklet

Selected worked examples

1. Motion · momentum

   Formula or reference: p = mv

   Units and conditions: Use kg and m/s. Retain the direction of velocity.

   Worked example: A 0.40 kg trolley moving west at 2.5 m/s has momentum 1.0 kg m/s west.

2. Waves · speed, frequency and wavelength

   Formula or reference: v = fλ

   Units and conditions: Use Hz and m for speed in m/s.

   Worked example: Water waves at 2.4 Hz with a wavelength of 0.80 m travel at about 1.9 m/s.