Units (Forces and Motion)
3 marks · NormalAn object experiences a force of 15 newtons (N) over an area of 3 m².
Calculate the pressure exerted (pressure = force ÷ area) and give its SI unit and symbol.
Is the pressure unit one of the base units listed for Forces and Motion in this syllabus? Explain briefly.
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) 5 pascal (Pa) Pa · must show pressure calculated (5 Pa), SI unit and symbol: pascal (Pa)
(b) No, pressure (Pa) is not one of the listed base units in this Forces and Motion section. · must show No, pressure not a listed base unit
Common mistakes: using N instead of Pa; forgetting division in calculation
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Divides force by area to find pressure (15 ÷ 3). (follow-through)
A1 (a) · 1 mark · Correct value: 5 Pa; correct SI unit and symbol: Pa. (follow-through)
B1 (b) · 1 mark · States that pressure is not a listed base unit in Forces and Motion for this syllabus.
Worked solution
a) Pressure = force ÷ area = 15 N ÷ 3 m² = 5 Pa.
b) No, pressure (Pa) is not one of the base units listed for Forces and Motion here.