# Pressure

In this worksheet, students will be introduced to the concept of pressure.

Key stage:  KS 3

Curriculum topic:   Physics: Motion and Forces

Curriculum subtopic:   Pressure in Fluids

Difficulty level:

### QUESTION 1 of 10

Pressure is the amount of force pushing over a certain area. The size of the pressure depends on the size of the force and the area it is applied on. This can be shown using the following formula:

 force pressure = area

High pressure can break things more easily than low pressure. Keeping the size of the force the same will lower the pressure on a large area, whereas for a small area the pressure will increase. Force is measured in Newtons (N) and the area in square metres. The unit for pressure is Pascal (Pa). 1 Pascal is equal to 1 Newton per square metre.

Tiny particles make up matter around us. The particles move and collide with each other; this means they bump onto each other and any surfaces they come into contact with when they move. Pressure is caused by the force of the particles hitting things and it comes from all directions in liquids and gases.

When we pump up a bicycle tyre, we squash the gas inside it; this gas is air. We add more air to it and the pressure is increased. The gas is compressed.

Pressure in water increases as we go deeper, because the weight (gravitational force) of the water increases, too.

If we go up a high mountain, the weight of the air above us decreases. This causes the pressure to decrease, too. The graph below shows how pressure alters with height and depth.

Choose the correct formula for pressure from the options below.

area over force

force over area

force times area

Calculate pressure when a force of 50 N is applied on an area of 10 square metres.

500 Pa

5 Pa

60 Pa

Calculate the force applied on an area of 100 square metres if the pressure is 2 Pa.

50 N

200 N

250 N

What is needed in order to lower the pressure of water at the bottom of a swimming pool?

Take some water out.

Decrease the area of the swimming pool.

What do particles do as they move? Choose two options.

Particles collide with each other.

Particles do not come into contact with anything when they move.

Particles collide with any surfaces they come into contact with.

Particles do not cause pressure.

Is this statement true or false?

Pressure in liquids and gases comes from only two directions.

true

false

Complete this sentence.

When we pump up a bicycle tyre, we put more _____ in it.

Complete this sentence.

When we pump up a bicycle tyre, we ______________ the air inside it.

hit

decrease

compress

Complete this sentence.

Pressure at the bottom of the sea is ____________ than pressure at the sea surface.

lower

higher

Complete this sentence.

Pressure ____________ with high altitude.

increases

decreases

• Question 1

Choose the correct formula for pressure from the options below.

force over area
EDDIE SAYS
Pressure equals force over area.
• Question 2

Calculate pressure when a force of 50 N is applied on an area of 10 square metres.

5 Pa
EDDIE SAYS
pressure = force over area = 50 over 10 = 5 Pa.
• Question 3

Calculate the force applied on an area of 100 square metres if the pressure is 2 Pa.

200 N
EDDIE SAYS
Force = pressure times area = 2 times 100 = 200 N.
• Question 4

What is needed in order to lower the pressure of water at the bottom of a swimming pool?

Take some water out.
EDDIE SAYS
If we take some water out, the pressure of water at the bottom of a swimming pool will decrease.
• Question 5

What do particles do as they move? Choose two options.

Particles collide with each other.
Particles collide with any surfaces they come into contact with.
EDDIE SAYS
As they move, particles collide with each other and surfaces they come into contact with.
• Question 6

Is this statement true or false?

Pressure in liquids and gases comes from only two directions.

false
EDDIE SAYS
The statement is false. Pressure is liquids and gases comes from all directions.
• Question 7

Complete this sentence.

When we pump up a bicycle tyre, we put more _____ in it.

air
gas
particles
EDDIE SAYS
When we pump up a bicycle tyre, we put more air in it. Instead of the word air, you could use gas or particles.
• Question 8

Complete this sentence.

When we pump up a bicycle tyre, we ______________ the air inside it.

compress
EDDIE SAYS
When we pump up a bicycle tyre, we compress the air inside it.
• Question 9

Complete this sentence.

Pressure at the bottom of the sea is ____________ than pressure at the sea surface.

higher
EDDIE SAYS
Pressure at the bottom of the sea is higher than pressure at the sea surface.
• Question 10

Complete this sentence.

Pressure ____________ with high altitude.

decreases
EDDIE SAYS
Pressure decreases with high altitude.
---- OR ----

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