1a1 mark
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.
1b4 marks
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.
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