Density + Pressure

Question 1

Why are some objects dense but others aren’t?

Answer 1

Because high density materials have more molecules/ atoms that have a large mass and/ or are tightly packed

Question 2

What is the formula for density volume and mass?

Answer 2

Density = mass/volume
P= m/v

Question 3

What are the units for density?

Answer 3

Kg/ m3

Question 4

Why do objects float in liquids?

Answer 4

because they are less dense than the liquid

Question 5

How do you measure the density of a regular shape?

Answer 5

Measure mass on a balance pan and cover in water in a cylinder, read the vol and then lower it into the water, measure vol again

Question 6

How do you measure the density of an irregular shape?

Answer 6

Measure mass on balance pan, place in 100 ml tube half way full, and then see how the vol changes

Question 7

Formula for pressure, force and area

Answer 7

Pressure = force ÷ area
P = F/A

Question 8

What is the symbol for pressure?

Answer 8

Pascal

Question 9

What are pascal’s the same as?

Answer 9

1N/m²

Question 10

How do you concentrate the load?

Answer 10

Apply force over a small over, pressure higher

Question 11

What are known as fluids?

Answer 11

Gasses, liquids

Question 12

Fluids exerts…

Answer 12

Pressure

Question 13

Pressure in fluids act in …… directions

Answer 13

All

Question 14

Pressure in fluids increase with …..

Answer 14

Depth

Question 15

Give examples of where pressure is observed

Answer 15

Aeroplanes, swimming pools

Question 16

What is the formula for pressure difference?

Answer 16

Pressure difference = height x density x g
p = h x p x g