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# SPH3U: Lesson 9 Quiz

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Use the student exploration guide to investigateĀ gravitational forces.

Complete all five questions below. Be sure to show all of your work including listing the givens provided in the question, stating what you are required to find, expressing any equations you are using, and providing the full solution.

1. Two very large cruise ships each have a mass of 415 000 tonnes. If they were docked side by side, 1.0 m apart, their centres would be 60 m apart. What is the force of gravitational attraction putting them together? (Hint: 1 tonne = 1000 kg)
2. What is the weight of a 1 200 kg car?
3. A large dog has a weight of 245 N. What is the mass of the dog?
4. On Earth, the gravitational field intensity is 9.8 N/kg. Mercury has a mass of 3.28 x 1023 kg and a radius of 2.57 x 106 m. Calculate the gravitational field intensity on Mercury in N/kg.
5. What would the weight of the dog from question 3 be if it was taken to Mercury?

Coastal regions around the world experience two low tides and two high tides each day. In some areas, various methods have been devised to generate energy using the natural forces of the tidal currents. In a concise report:

– describe the factors responsible for the production of tides on Earth.
– outline why there are two low tides and two high tides each day.
– describe how energy is generated from tidal currents.
– describe the advantages and disadvantages for the environment as a result of energy generation from tidal currents.

### Rubric

Note: A student whose achievement is below Level 1 (50%) has not met the expectations for this assignment or activity.