PH-440
States of matter
Physics · Secondary 3 · Hard · States of matter
A car braking system uses a fluid to transmit force from the brake pedal to the wheels. Which statement best explains why a liquid, not a gas, is used as the brake fluid?
- Liquids are almost incompressible, so force is transmitted efficiently.
- Liquids have fixed shape, so they do not move in the pipes.
- Gases are too dense, so they cannot move in narrow pipes.
- Gases always escape from closed systems, but liquids never do.
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