Solids, Liquids and Gases

4 marks · Easy

A block with a weight of 30 N stands on a platform of area 0.015 m².

(a)

State the formula for pressure under a solid, using symbols.

[1 mark]

(b)

Calculate the pressure the block exerts on the platform. Give the unit.

[3 marks]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

(a) p = F / A

(b) 2000 Pa

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · States correct formula in symbols: p = F / A.

M1 (b) · 1 mark · Substitutes correct values for F and A. (follow-through)

M2 (b) · 1 mark · Performs calculation: 30 / 0.015. (follow-through)

A1 (b) · 1 mark · Final answer with correct unit: Pa. (follow-through)

Worked solution

a) The formula is p = F / A.

b) Substitute the values: p = 30 N / 0.015 m² = 2000 Pa.