Pressure under a solid
3 marks · NormalA wooden block of mass 5.0 kg rests on a flat table. The contact area between the block and the table is 0.20 m^2.
Calculate the weight of the block. (Take g = 10 N/kg)
Calculate the pressure exerted by the block on the table. Give your answer in pascals (Pa).
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) 50 N
(b) 250 Pa
Common mistakes: Using mass instead of weight for force; Incorrectly converting units
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Weight calculated using W = mg.
M2 (b) · 1 mark · Pressure calculation: correct use of p = F/A. (follow-through)
A1 (b) · 1 mark · Correct answer for pressure with appropriate units. (follow-through)
Worked solution
a) Weight, W = mass × g = 5.0 kg × 10 N/kg = 50 N
b) Pressure, p = F / A = 50 N / 0.20 m^2 = 250 Pa