1. A cruise ship stops briefly at a harbour at 6 a. m., when it is low tide. All the passengers on the
ship alight. At noon, Marie observes that the ship floats one metre higher in the harbour than
it did in the morning,
(a) Name a part of the ship where a contact force acts.
a
(b) Marie is the first passenger to alight in the morning and the last to board at noon.
She formulates a hypothesis that the ship floats lower in the morning because it is fully
loaded with passengers.
How could Marie test her hypothesis?