Question

The diagram below shows a bus in two positions.

Bus

The centre of gravity of the bus is marked with a G.

For each position describe and explain what happens to the bus.

Position 1

  • The bus does not topple over.
  • This is because the centre of gravity G is inside the wheel base. The weight produces a clockwise moment about the pivot, pulling the bus back onto its base.

Position 2

  • The bus topples over.
  • This is because the centre of gravity G is outside the wheel base. The weight produces an anticlockwise moment about the pivot, pulling the bus off its base and on to its side.
Bus
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