8l - Fluids - Floating and Sinking

Question 1

What were the first boats made by humans made out of?

Answer 1

Wood

Question 2

What does upthrust feel like?

Answer 2

When you float on water, you feel like you weigh less

Question 3

When is there upthrust on an objection a fluid

Answer 3

Always

Question 4

If the density of the fluid is larger than the density of the object on the fluid the object on the fluid will __________

Answer 4

If the density of the fluid is larger than the density of the object on the fluid the object on the fluid will float

Question 5

If the density of the fluid is smaller than the density of the object on the fluid the object on the fluid will __________

Answer 5

If the density of the fluid is smaller than the density of the object on the fluid the object on the fluid will sink

Question 6

What is the density of the air?

Answer 6

0.001 g/cm3

Question 7

Why does a hot air balloon fly?

Answer 7

The overall density is less than the air around it