Selina solutions

Selina solutions

Grade 8

Force and Pressure | Numericals

Question 12

Q12) A boy weighing 60 kgf stands on a platform of dimensions 2.5 cm \times 0.5 cm. What pressure in pascal does he exert?

Solution:

Force = Weight = 60kgf

= 60\times10 = 600N

Area = 2.5 cm \times 0.5 cm

A = \frac{2.5}{100}m\times\frac{0.5}{100}m\ =\ \frac{25}{1000}\times\frac{5}{1000}=\frac{1}{8000}m^2

Pressure = Force/Area

P = 600\ N\ \div\frac{1}{8000}m^2

P = \frac{600\times8000}{1}

P = 4800000 Pa = 4.8 \times 10^6 Pa

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Question 12

Q12) A boy weighing 60 kgf stands on a platform of dimensions 2.5 cm \times 0.5 cm. What pressure in pascal does he exert?

Solution:

Force = Weight = 60kgf

= 60\times10 = 600N

Area = 2.5 cm \times 0.5 cm

A = \frac{2.5}{100}m\times\frac{0.5}{100}m\ =\ \frac{25}{1000}\times\frac{5}{1000}=\frac{1}{8000}m^2

Pressure = Force/Area

P = 600\ N\ \div\frac{1}{8000}m^2

P = \frac{600\times8000}{1}

P = 4800000 Pa = 4.8 \times 10^6 Pa

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