Density and Archimedes Principle

Question 1

What is the equation for density?

Answer 1

density = mass/volume or ρ* = m/V

*rho not a p

Question 2

What is the unit for density?

Answer 2

kg per m cubed

Question 3

How do you find out the density of an irregular shaped object?

Answer 3

1. Place the object on the balance and measure its mass.
2. Fill a measuring cylinder so that there is enough water to cover the object when it is placed inside the cylinder. Take the reading of the volume.
3. Carefully lower the object into the cylinder.
4. Take the new reading of the volume. Subtract the original reading from the new reading, to obtain the volume of the object.
5. Use the measurements to calculate the density of the object.

Question 4

What is Archimedes Principle?

Answer 4

‘The buoyant force on a submerged object is equal to the weight of the fluid that is displaced by the object.’

This means that when an object is dropped into water, some of that water is displaced. At the same time, buoyancy is pushing up on the object, which changes its weight. If the weight of the object is heavier than the amount of water it displaces, the object will sink. If the amount of water displaced is equal to the weight of the object, it will float.

Question 5

What is density?

Answer 5

Density describes how concentrated or compact something is.