Pressure is calculated by dividing force by area. There is more pressure at greater depths in liquids and in denser materials.

What is the definition of 'pressure'?

Force per total area

Mass per unit area

Force per unit area

What is the unit of pressure?

Newtons (N)

Pascals (Pa)

Kilogram metres per second (kg m/s)

Which of the following is not a unit of pressure?

Pa

N/cm

N/mm^{2}

What does a pressure of 50 Pa mean?

A force of 50 N acts over an area of 1 mm^{2}

A force of 50 N acts over an area of 1 cm^{2}

A force of 50 N acts over an area of 1 m^{2}

A force of 10 N acts over a surface area of 2 m^{2}. What is the pressure?

5 Pa

12 Pa

20 Pa

Which of the following statements is true?

When using a sharp knife, the small area of the blade creates a large pressure, making cutting easier.

When using a sharp knife, the small area of the blade creates a large force, making cutting easier.

When using a sharp knife, the large area of the blade creates a small pressure, making cutting easier.

The water pressure at the bottom of a reservoir dam is 200,000 Pa. What force is exerted on a 25 m^{2} section of the dam?

8000 N

5,000,000 N

5,000,000 Pa

Tractor tyres are wide - this increases the pressure they exert and are less likely to sink in to wet ground

Tractor tyres are narrow - this reduces the pressure they exert and are less likely to sink in to wet ground

Tractor tyres are wide - this reduces the pressure they exert and are less likely to sink in to wet ground

A girl standing on one foot exerts a pressure of 6.5 N/cm^{2} on the ground. If the area of her foot is 80 cm^{2}, calculate the total downward force.

12.3 N

520 N

750 N

A force of 55 N acts over a surface area of 5 cm^{2}. What is the pressure?

11 Pa

275 Pa

110,000 Pa