Density And Pressure

Question 1

What is density

Answer 1

The mass of an object divided by its volume

Question 2

How to work out the density of plasticine

Answer 2

Mass: use a top pan balance 
Volume: 
1) make a cuboid, use v= l x w x h
2) displacement in a measuring cylinder 
3) displacement using a eureka can

Question 3

How to ensure measuring the density of plasticine is accurate

Answer 3

Read measuring cylinder at eye level
Measure from the bottom of the meniscos
Place on level surface

Question 4

Density of salt water

Answer 4

1.2g/cm3

Question 5

What is pressure

Answer 5

Pressure is the measure of a concentration of a force acting over an area

Question 6

Pressure formula

Answer 6

Pressure = force/area

Question 7

How to explain a pressure

Answer 7

1) identify the force (weight or push)
2) area = large or small
3) pressure = large or small
4) what happens

Question 8

Explanation of pressure of liquids/gases

Answer 8

When going deeper in a liquid, the pressure increases, as there is more weight of water above

Question 9

Pressure difference equation

Answer 9

Pressure difference = height x density of the liquid x gravitational field strength

(Gravitational field strength = 10 N/kg)

Question 10

Atmospheric pressure

Answer 10

100 000Pa