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2.3 Forces in action

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Question 4
F

A woman walks across soft snow. Her weight is 600 N.

Use the equation: pressure=force normal to a surfacearea of that surface\text{pressure} = \dfrac{\text{force normal to a surface}}{\text{area of that surface}}pressure=area of that surfaceforce normal to a surface​

a.

The total area of her boots in contact with the snow is 0.030 m2.

Calculate the pressure she exerts on the snow.

Give your answer in Pa\text{Pa}Pa.

[2]
b.

She now wears snowshoes. The total area of the snowshoes in contact with the snow is 0.20 m2.

Calculate the new pressure she exerts on the snow.

[2]
c.

Explain why she sinks less deeply into the snow when she wears snowshoes.

[2]
Markscheme

2.3 Forces in action Questions

  1. GCSE
  2. /Physics
  3. /2.3 Forces in action

46 exam-style questions on OCR GCSE Physics 2.3 Forces in action, covering 2.3.1 Stretching, bending and compressing, 2.3.2 Elastic and plastic deformation, 2.3.3 Force and extension of a spring, 2.3.4 Linear and non-linear force-extension behaviour, 2.3.5 The spring constant, 2.3.6 Work done in stretching, 2.3.7 Gravitational fields, 2.3.8 Weight and gravitational field strength, 2.3.9 Acceleration in free fall, 2.3.10 Relating force, mass and gravitational field strength, 2.3.11 Forces causing rotation, 2.3.12 The moment of a force, 2.3.13 Levers and gears, 2.3.14 Pressure in fluids, and 2.3.15 Pressure, force and contact area. Each one has a worked solution and a mark scheme showing where the marks go.

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