Topic 6 Buoyancy

Question 1

Buoyancy

Answer 1

The tendency to rise or float on a fluid

Question 2

Buoyant force

Answer 2

The upward force exerted on objects submerged in or floating on a fluid, expressed in N.

Question 3

Floating vs sinking

Answer 3

If gravity is greater than buoyancy then the object will sink, if buoyancy is greater than gravity the object will float.

Question 4

Neutral buoyancy

Answer 4

buoyancy and density are equal and the object neither floats nor sinks but rather remains suspended in the fluid

Question 5

Floating

Answer 5

Remaining suspended in a fluid. For example, not falling in air or sinking in water.

Question 6

Factors affecting buoyancy

Answer 6

1. Density of the fluid. eg. salt water vs fresh water.
2. Surface area. eg. water can support objects with densities greater than water, as long as the object is spread over a large enough area.
3. Design of object.

Question 7

Average density

Answer 7

The total mass of an object divided by the total volume. eg. life jackets lower a person’s average density, allowing the person to float.

Question 8

explain archimedes principle

Answer 8

archimedes principle is when a guy discovered how to measure the volume of an irregular shaped object by using displacement. when you put an object in a jug of water, all the water that spills out has the exact same volume as the volume of the object so that is how you can find the volume of a weirdly shaped object.

Question 9

Hydrometer

Answer 9

This is an object designed to find the density of a liquid

Question 10

How buoyancy and density are related

Answer 10

Objects float higher on saltwater than in freshwater. This is because salt water has more particles tightly packed than fresh water, this means that salt water can support more weight per volume than fresh water.