Forces on a ladder on a wall

A ladder rests on rough ground and leans against a rough wall. Its weight W acts through the centre of gravity G. Forces also act on the ladder at P and Q. These forces are P and Q respectively.

Which vector triangle represents the forces on the ladder?

Using Loom and GeoGebra to explain a tutorial question

It’s Day 1 of the full home-based learning month in Singapore! As teachers all over Singapore scramble to understand the use of the myriad EdTech tools, I have finally come to settle on a few:

  1. Google Meet to do video conferencing
  2. Google Classroom for assignment that requires marking
  3. Student Learning Space for students’ self-directed learning, collaborative discussion and formative assessment.
  4. Loom for lecture recording
  5. GeoGebra for visualisation

The following is a video that was created using Loom to explain a question on why tension in a rope on which a weight is balanced increases when the rope straightens.