Moments (Edexcel AS Physics)

A uniform paving slab is to be used as a garden step.

State what is meant by the centre of gravity of an extended body.

The paving slab has a weight of 310 N and a length of 90 cm and will be supported at two points, P and Q, as shown. The distance between P and Q will be 75 cm.

This might be unsafe because a person who places all their weight at the end of the slab might tip the slab.

A person of mass 70 kg stands at the end of the slab.

Deduce whether the slab will tip.