FLUID STATICS.

Film Loop: Archimedes' Principle

Length: 3:40 Min., Black and White, No Sound

It would be advisable for you to view the film once, from beginning to end, ignoring the letter Q which appears from time to time in the center of the picture. Then, view the film again, stopping the projector each time a Q appears. Each Qwill refer you to a question which appears in these Film Notes.

Archimedes, who lived over two thousand years ago, discovered the principle which you will learn about in this film. He was one of the first men to carry out experiments in order to test his ideas. Some of his experiments were the beginning of the science of hydrostatics : how liquid behaves when at rest.

BASIC IDEAS: An object immersed in water appears to lose weight. The volume of water displaced by an object is equal to the volume of the object immersed. The weight loss of an object immersed in water is equal to the weight of the water displaced.

Q1 Why does the water level rise as rocks are put into the container?

Q2 Compare the volume of the aluminum cube with the water it displaces.

Q3 What is the weight of the aluminum cube in air (read the black markings) in grams?

Q4 What is the weight of the cube in water? How much weight does the cube seem to lose?

Q5 What volume of water will the cube displace?

Q6 What is the combined weight of the cup and displaced water?

Q7 What is weight of the cup? What is the weight of the displaced water? Weight loss of the cube in water?

Q8 Compare the volume of the cylinder to the volume of the bucket.

Q9 Note the weight of the cylinder and bucket in air.

Q10 Note the weight loss when the cylinder is immersed in water.

Q11 What volume of water is added to the bucket?

Q12 What does this tell you about the amount of weight loss of the object in water?