Physics 9702 · AS & A Level · Density and pressure

Density and pressure — practice question

The diagram illustrates a car’s brake system. The pipes contain incompressible liquid. When a force is exerted on the brake pedal, the pressure in the liquid rises and produces a force on each of the four wheels. The area of the piston attached to the brake pedal is $8\,\text{cm}^2$. The area of each piston attached to the brakes is $12\,\text{cm}^2$. The foot applies a force of $800\,\text{N}$ to the brake pedal. What force is applied to each brake?

  • A$300\,\text{N}$
  • B$530\,\text{N}$
  • C$1200\,\text{N}$
  • D$4800\,\text{N}$

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